commit 42d927d15b04ecc8a7c3da3ee7a040a4a36f806d · anil.recoil.org/ocaml-kgp

dune-project

···

       8
        
         "A standalone library for rendering images in terminals that support the Kitty graphics protocol. Supports image transmission, display, animation, Unicode placeholders, and terminal capability detection.")

     

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        (depends

     

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         (ocaml (>= 4.14.0))

     

       0
        
       
     

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         base64))

···

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         "A standalone library for rendering images in terminals that support the Kitty graphics protocol. Supports image transmission, display, animation, Unicode placeholders, and terminal capability detection.")

     

       9
        
        (depends

     

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         (ocaml (>= 4.14.0))

     

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       +
         cmdliner

     

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         base64))

-97

example/anim_test.ml

···

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       -
       (* Minimal animation test - shows exact bytes sent *)

     

       2
       -
       

     

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       module K = Kgp

     

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       -
       

     

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       let solid_color_rgba ~width ~height ~r ~g ~b ~a =

     

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         let pixels = Bytes.create (width * height * 4) in

     

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         for i = 0 to (width * height) - 1 do

     

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           let idx = i * 4 in

     

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           Bytes.set pixels idx (Char.chr r);

     

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           Bytes.set pixels (idx + 1) (Char.chr g);

     

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           Bytes.set pixels (idx + 2) (Char.chr b);

     

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           Bytes.set pixels (idx + 3) (Char.chr a)

     

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         done;

     

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         Bytes.to_string pixels

     

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       -
       

     

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       let send cmd ~data =

     

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         print_string (K.Command.to_string cmd ~data);

     

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         flush stdout

     

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       -
       

     

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       let () =

     

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         let width, height = 40, 40 in  (* Smaller for faster testing *)

     

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         let image_id = 500 in

     

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       -
       

     

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         (* Clear any existing image *)

     

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         send (K.Command.delete ~free:true ~quiet:`Errors_only `All_visible) ~data:"";

     

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       -
       

     

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         (* Step 1: Transmit base frame (red) *)

     

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         let red_frame = solid_color_rgba ~width ~height ~r:255 ~g:0 ~b:0 ~a:255 in

     

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         send

     

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           (K.Command.transmit

     

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              ~image_id

     

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              ~format:`Rgba32

     

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              ~width ~height

     

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              ~quiet:`Errors_only

     

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              ())

     

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           ~data:red_frame;

     

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       -
       

     

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         (* Step 2: Add frame (blue) *)

     

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         let blue_frame = solid_color_rgba ~width ~height ~r:0 ~g:0 ~b:255 ~a:255 in

     

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         send

     

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           (K.Command.frame

     

       42
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              ~image_id

     

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              ~format:`Rgba32

     

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              ~width ~height

     

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              ~frame:(K.Frame.make ~gap_ms:500 ~composition:`Overwrite ())

     

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              ~quiet:`Errors_only

     

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              ())

     

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           ~data:blue_frame;

     

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       -
       

     

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         (* Step 3: Add frame (green) *)

     

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         let green_frame = solid_color_rgba ~width ~height ~r:0 ~g:255 ~b:0 ~a:255 in

     

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         send

     

       53
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           (K.Command.frame

     

       54
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              ~image_id

     

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              ~format:`Rgba32

     

       56
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              ~width ~height

     

       57
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              ~frame:(K.Frame.make ~gap_ms:500 ~composition:`Overwrite ())

     

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              ~quiet:`Errors_only

     

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              ())

     

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           ~data:green_frame;

     

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       -
       

     

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         (* Step 4: Create placement *)

     

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         send

     

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           (K.Command.display

     

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              ~image_id

     

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              ~placement:(K.Placement.make

     

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                            ~placement_id:1

     

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                            ~cursor:`Static

     

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                            ())

     

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              ~quiet:`Errors_only

     

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              ())

     

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           ~data:"";

     

       73
       -
       

     

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         (* Step 5: Set root frame gap - IMPORTANT: root frame has no gap by default *)

     

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         send

     

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           (K.Command.animate ~image_id (K.Animation.set_gap ~frame:1 ~gap_ms:500))

     

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           ~data:"";

     

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         (* Step 6: Start animation *)

     

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         send

     

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           (K.Command.animate ~image_id (K.Animation.set_state ~loops:1 `Run))

     

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           ~data:"";

     

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         print_endline "";

     

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         print_endline "Animation should be playing (red -> blue -> green).";

     

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         print_endline "Press Enter to stop...";

     

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         flush stdout;

     

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         let _ = read_line () in

     

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       -
       

     

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         (* Stop animation *)

     

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         send

     

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           (K.Command.animate ~image_id (K.Animation.set_state `Stop))

     

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           ~data:"";

     

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         (* Clean up *)

     

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         send (K.Command.delete ~free:true ~quiet:`Errors_only `All_visible) ~data:"";

     

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         print_endline "Done."

example/anim_test.mli

This is a binary file and will not be displayed.

example/camel.png

This is a binary file and will not be displayed.

-94

example/debug_anim.ml

···

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       (* Debug: Output animation escape sequences for comparison with Go *)

     

       2
       -
       

     

       3
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       module K = Kgp

     

       4
       -
       

     

       5
       -
       let solid_color_rgba ~width ~height ~r ~g ~b ~a =

     

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         let pixels = Bytes.create (width * height * 4) in

     

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         for i = 0 to (width * height) - 1 do

     

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           let idx = i * 4 in

     

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           Bytes.set pixels idx (Char.chr r);

     

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           Bytes.set pixels (idx + 1) (Char.chr g);

     

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           Bytes.set pixels (idx + 2) (Char.chr b);

     

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           Bytes.set pixels (idx + 3) (Char.chr a)

     

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         done;

     

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         Bytes.to_string pixels

     

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       -
       

     

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       let send cmd ~data =

     

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         let s = K.Command.to_string cmd ~data in

     

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         (* Print escaped version for debugging *)

     

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         String.iter (fun c ->

     

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           let code = Char.code c in

     

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           if code = 27 then print_string "\\x1b"

     

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           else if code < 32 || code > 126 then Printf.printf "\\x%02x" code

     

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           else print_char c

     

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         ) s;

     

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         print_newline ()

     

       26
       -
       

     

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       let () =

     

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         let width, height = 80, 80 in

     

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         let image_id = 300 in

     

       30
       -
       

     

       31
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         print_endline "=== OCaml Animation Debug ===\n";

     

       32
       -
       

     

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         (* Step 1: Transmit base frame *)

     

       34
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         print_endline "1. Transmit base frame (a=t):";

     

       35
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         let red_frame = solid_color_rgba ~width ~height ~r:255 ~g:0 ~b:0 ~a:255 in

     

       36
       -
         send

     

       37
       -
           (K.Command.transmit

     

       38
       -
              ~image_id

     

       39
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              ~format:`Rgba32

     

       40
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              ~width ~height

     

       41
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              ~quiet:`Errors_only

     

       42
       -
              ())

     

       43
       -
           ~data:red_frame;

     

       44
       -
         print_newline ();

     

       45
       -
       

     

       46
       -
         (* Step 2: Add frame *)

     

       47
       -
         print_endline "2. Add frame (a=f):";

     

       48
       -
         let orange_frame = solid_color_rgba ~width ~height ~r:255 ~g:165 ~b:0 ~a:255 in

     

       49
       -
         send

     

       50
       -
           (K.Command.frame

     

       51
       -
              ~image_id

     

       52
       -
              ~format:`Rgba32

     

       53
       -
              ~width ~height

     

       54
       -
              ~frame:(K.Frame.make ~gap_ms:100 ~composition:`Overwrite ())

     

       55
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              ~quiet:`Errors_only

     

       56
       -
              ())

     

       57
       -
           ~data:orange_frame;

     

       58
       -
         print_newline ();

     

       59
       -
       

     

       60
       -
         (* Step 3: Put/display placement *)

     

       61
       -
         print_endline "3. Create placement (a=p):";

     

       62
       -
         send

     

       63
       -
           (K.Command.display

     

       64
       -
              ~image_id

     

       65
       -
              ~placement:(K.Placement.make

     

       66
       -
                            ~placement_id:1

     

       67
       -
                            ~cell_x_offset:0

     

       68
       -
                            ~cell_y_offset:0

     

       69
       -
                            ~cursor:`Static

     

       70
       -
                            ())

     

       71
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              ~quiet:`Errors_only

     

       72
       -
              ())

     

       73
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           ~data:"";

     

       74
       -
         print_newline ();

     

       75
       -
       

     

       76
       -
         (* Step 4: Set root frame gap *)

     

       77
       -
         print_endline "4. Set root frame gap (a=a,r=1,z=100):";

     

       78
       -
         send

     

       79
       -
           (K.Command.animate ~image_id (K.Animation.set_gap ~frame:1 ~gap_ms:100))

     

       80
       -
           ~data:"";

     

       81
       -
         print_newline ();

     

       82
       -
       

     

       83
       -
         (* Step 5: Animate *)

     

       84
       -
         print_endline "5. Start animation (a=a,s=3,v=1):";

     

       85
       -
         send

     

       86
       -
           (K.Command.animate ~image_id (K.Animation.set_state ~loops:1 `Run))

     

       87
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           ~data:"";

     

       88
       -
         print_newline ();

     

       89
       -
       

     

       90
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         (* Step 6: Stop animation *)

     

       91
       -
         print_endline "6. Stop animation:";

     

       92
       -
         send

     

       93
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           (K.Command.animate ~image_id (K.Animation.set_state `Stop))

     

       94
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           ~data:""

example/debug_anim.mli

This is a binary file and will not be displayed.

+3 -11

example/dune

···

       2
        
        (name example)

     

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        (libraries kgp unix))

     

       4
        
       

     

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       -
       (executable

     

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        (name debug_anim)

     

       7
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        (libraries kgp))

     

       8
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       (executable

     

       10
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        (name test_output)

     

       11
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        (libraries kgp))

     

       12
       -
       

     

       13
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       (executable

     

       14
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        (name anim_test)

     

       15
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        (libraries kgp))

     

       16
        
       

     

       17
        
       (executable

     

       18
        
        (name tiny_anim)

···

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        (name example)

     

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        (libraries kgp unix))

     

       4
        
       

     

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       (alias

     

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        (name example)

     

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        (deps example.exe camel.png))

     

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       (executable

     

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        (name tiny_anim)

+34 -34

example/example.ml

···

       50
        
         s

     

       51
        
       

     

       52
        
       let send cmd ~data =

     

       53
       -
         print_string (K.Command.to_string cmd ~data);

     

       54
        
         flush stdout

     

       55
        
       

     

       56
        
       let wait_for_enter () =

     
···

       78
        
         (* Demo 1: Basic formats - PNG *)

     

       79
        
         clear_screen ();

     

       80
        
         print_endline "Demo 1: Image Formats - PNG format";

     

       81
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         (* Read sf.png and display a small portion as demo *)

     

       82
        
         (try

     

       83
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            let png_data = read_file "sf.png" in

     

       84
        
            send

     

       85
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              (K.Command.transmit_and_display

     

       86
        
                 ~image_id:1

     

       87
        
                 ~format:`Png

     

       88
        
                 ~quiet:`Errors_only

     

       89
        
                 ~placement:(K.Placement.make ~columns:15 ~rows:8 ())

     

       90
        
                 ())

     

       91
        
              ~data:png_data;

     

       92
       -
            print_endline "sf.png displayed using PNG format"

     

       93
        
          with _ ->

     

       94
        
            (* Fallback: red square as RGBA *)

     

       95
        
            let red_data = solid_color_rgba ~width:100 ~height:100 ~r:255 ~g:0 ~b:0 ~a:255 in

     

       96
        
            send

     

       97
       -
              (K.Command.transmit_and_display

     

       98
        
                 ~image_id:1

     

       99
        
                 ~format:`Rgba32

     

       100
        
                 ~width:100 ~height:100

     

       101
        
                 ~quiet:`Errors_only

     

       102
        
                 ())

     

       103
        
              ~data:red_data;

     

       104
       -
            print_endline "Red square displayed (sf.png not found)");

     

       105
        
         print_newline ();

     

       106
        
         wait_for_enter ();

     

       107
        
       

     
···

       110
        
         print_endline "Demo 2: Image Formats - RGBA format (32-bit)";

     

       111
        
         let blue_data = solid_color_rgba ~width:100 ~height:100 ~r:0 ~g:0 ~b:255 ~a:255 in

     

       112
        
         send

     

       113
       -
           (K.Command.transmit_and_display

     

       114
        
              ~image_id:2

     

       115
        
              ~format:`Rgba32

     

       116
        
              ~width:100 ~height:100

     
···

       126
        
         print_endline "Demo 3: Image Formats - RGB format (24-bit)";

     

       127
        
         let green_data = solid_color_rgb ~width:100 ~height:100 ~r:0 ~g:255 ~b:0 in

     

       128
        
         send

     

       129
       -
           (K.Command.transmit_and_display

     

       130
        
              ~image_id:3

     

       131
        
              ~format:`Rgb24

     

       132
        
              ~width:100 ~height:100

     
···

       142
        
         print_endline "Demo 4: Large Image (compression requires zlib library)";

     

       143
        
         let orange_data = solid_color_rgba ~width:200 ~height:200 ~r:255 ~g:165 ~b:0 ~a:255 in

     

       144
        
         send

     

       145
       -
           (K.Command.transmit_and_display

     

       146
        
              ~image_id:4

     

       147
        
              ~format:`Rgba32

     

       148
        
              ~width:200 ~height:200

     
···

       155
        
       

     

       156
        
         (* Demo 5: Load and display external PNG file *)

     

       157
        
         clear_screen ();

     

       158
       -
         print_endline "Demo 5: Loading external PNG file (sf.png)";

     

       159
        
         (try

     

       160
       -
            let png_data = read_file "sf.png" in

     

       161
        
            send

     

       162
       -
              (K.Command.transmit_and_display

     

       163
        
                 ~image_id:10

     

       164
        
                 ~format:`Png

     

       165
        
                 ~quiet:`Errors_only

     

       166
        
                 ())

     

       167
        
              ~data:png_data;

     

       168
       -
            print_endline "sf.png loaded and displayed"

     

       169
        
          with Sys_error msg ->

     

       170
       -
            Printf.printf "sf.png not found: %s\n" msg);

     

       171
        
         print_newline ();

     

       172
        
         wait_for_enter ();

     

       173
        
       

     
···

       176
        
         print_endline "Demo 6: Cropping and Scaling - Display part of an image";

     

       177
        
         let gradient = gradient_rgba ~width:200 ~height:200 in

     

       178
        
         send

     

       179
       -
           (K.Command.transmit_and_display

     

       180
        
              ~image_id:20

     

       181
        
              ~format:`Rgba32

     

       182
        
              ~width:200 ~height:200

     
···

       198
        
         let cyan_data = solid_color_rgba ~width:80 ~height:80 ~r:0 ~g:255 ~b:255 ~a:255 in

     

       199
        
         (* Transmit once with an ID *)

     

       200
        
         send

     

       201
       -
           (K.Command.transmit

     

       202
        
              ~image_id:100

     

       203
        
              ~format:`Rgba32

     

       204
        
              ~width:80 ~height:80

     
···

       207
        
           ~data:cyan_data;

     

       208
        
         (* Create first placement *)

     

       209
        
         send

     

       210
       -
           (K.Command.display

     

       211
        
              ~image_id:100

     

       212
        
              ~placement:(K.Placement.make ~columns:10 ~rows:5 ())

     

       213
        
              ~quiet:`Errors_only

     
···

       215
        
           ~data:"";

     

       216
        
         (* Create second placement *)

     

       217
        
         send

     

       218
       -
           (K.Command.display

     

       219
        
              ~image_id:100

     

       220
        
              ~placement:(K.Placement.make ~columns:5 ~rows:3 ())

     

       221
        
              ~quiet:`Errors_only

     
···

       234
        
         let grad_small = gradient_rgba ~width:100 ~height:100 in

     

       235
        
         (* Transmit once *)

     

       236
        
         send

     

       237
       -
           (K.Command.transmit

     

       238
        
              ~image_id:160

     

       239
        
              ~format:`Rgba32

     

       240
        
              ~width:100 ~height:100

     
···

       243
        
           ~data:grad_small;

     

       244
        
         (* Place same image three times at different sizes *)

     

       245
        
         send

     

       246
       -
           (K.Command.display

     

       247
        
              ~image_id:160

     

       248
        
              ~placement:(K.Placement.make ~columns:5 ~rows:5 ())

     

       249
        
              ~quiet:`Errors_only

     
···

       251
        
           ~data:"";

     

       252
        
         print_string "  ";

     

       253
        
         send

     

       254
       -
           (K.Command.display

     

       255
        
              ~image_id:160

     

       256
        
              ~placement:(K.Placement.make ~columns:8 ~rows:8 ())

     

       257
        
              ~quiet:`Errors_only

     
···

       259
        
           ~data:"";

     

       260
        
         print_string "  ";

     

       261
        
         send

     

       262
       -
           (K.Command.display

     

       263
        
              ~image_id:160

     

       264
        
              ~placement:(K.Placement.make ~columns:12 ~rows:12 ())

     

       265
        
              ~quiet:`Errors_only

     
···

       276
        
         print_endline "Demo 9: Z-Index Layering - Images above/below text";

     

       277
        
         let bg_data = solid_color_rgba ~width:200 ~height:100 ~r:255 ~g:165 ~b:0 ~a:128 in

     

       278
        
         send

     

       279
       -
           (K.Command.transmit_and_display

     

       280
        
              ~image_id:200

     

       281
        
              ~format:`Rgba32

     

       282
        
              ~width:200 ~height:100

     
···

       309
        
         (* Create base frame (red) - transmit without displaying *)

     

       310
        
         let red_frame = solid_color_rgba ~width ~height ~r:255 ~g:0 ~b:0 ~a:255 in

     

       311
        
         send

     

       312
       -
           (K.Command.transmit

     

       313
        
              ~image_id

     

       314
        
              ~format:`Rgba32

     

       315
        
              ~width ~height

     
···

       320
        
         (* Add frames with composition replace *)

     

       321
        
         let orange_frame = solid_color_rgba ~width ~height ~r:255 ~g:165 ~b:0 ~a:255 in

     

       322
        
         send

     

       323
       -
           (K.Command.frame

     

       324
        
              ~image_id

     

       325
        
              ~format:`Rgba32

     

       326
        
              ~width ~height

     
···

       331
        
       

     

       332
        
         let yellow_frame = solid_color_rgba ~width ~height ~r:255 ~g:255 ~b:0 ~a:255 in

     

       333
        
         send

     

       334
       -
           (K.Command.frame

     

       335
        
              ~image_id

     

       336
        
              ~format:`Rgba32

     

       337
        
              ~width ~height

     
···

       342
        
       

     

       343
        
         let green_frame = solid_color_rgba ~width ~height ~r:0 ~g:255 ~b:0 ~a:255 in

     

       344
        
         send

     

       345
       -
           (K.Command.frame

     

       346
        
              ~image_id

     

       347
        
              ~format:`Rgba32

     

       348
        
              ~width ~height

     
···

       353
        
       

     

       354
        
         (* Create placement and start animation *)

     

       355
        
         send

     

       356
       -
           (K.Command.display

     

       357
        
              ~image_id

     

       358
        
              ~placement:(K.Placement.make

     

       359
        
                            ~placement_id:1

     
···

       367
        
       

     

       368
        
         (* Set root frame gap - root frame has no gap by default per Kitty protocol *)

     

       369
        
         send

     

       370
       -
           (K.Command.animate ~image_id (K.Animation.set_gap ~frame:1 ~gap_ms:100))

     

       371
        
           ~data:"";

     

       372
        
       

     

       373
        
         (* Start animation with infinite looping *)

     

       374
        
         send

     

       375
       -
           (K.Command.animate ~image_id (K.Animation.set_state ~loops:1 `Run))

     

       376
        
           ~data:"";

     

       377
        
       

     

       378
        
         print_newline ();

     
···

       385
        
       

     

       386
        
           (* Delete the current placement *)

     

       387
        
           send

     

       388
       -
             (K.Command.delete ~quiet:`Errors_only (`By_id (image_id, Some 1)))

     

       389
        
             ~data:"";

     

       390
        
       

     

       391
        
           (* Create new placement at next position *)

     

       392
        
           send

     

       393
       -
             (K.Command.display

     

       394
        
                ~image_id

     

       395
        
                ~placement:(K.Placement.make

     

       396
        
                              ~placement_id:1

     
···

       405
        
       

     

       406
        
         (* Stop the animation *)

     

       407
        
         send

     

       408
       -
           (K.Command.animate ~image_id (K.Animation.set_state `Stop))

     

       409
        
           ~data:"";

     

       410
        
       

     

       411
        
         print_endline "Animation stopped.";

···

       50
        
         s

     

       51
        
       

     

       52
        
       let send cmd ~data =

     

       53
       +
         print_string (K.to_string cmd ~data);

     

       54
        
         flush stdout

     

       55
        
       

     

       56
        
       let wait_for_enter () =

     
···

       78
        
         (* Demo 1: Basic formats - PNG *)

     

       79
        
         clear_screen ();

     

       80
        
         print_endline "Demo 1: Image Formats - PNG format";

     

       81
       +
         (* Read camel.png and display a small portion as demo *)

     

       82
        
         (try

     

       83
       +
            let png_data = read_file "camel.png" in

     

       84
        
            send

     

       85
       +
              (K.transmit_and_display

     

       86
        
                 ~image_id:1

     

       87
        
                 ~format:`Png

     

       88
        
                 ~quiet:`Errors_only

     

       89
        
                 ~placement:(K.Placement.make ~columns:15 ~rows:8 ())

     

       90
        
                 ())

     

       91
        
              ~data:png_data;

     

       92
       +
            print_endline "camel.png displayed using PNG format"

     

       93
        
          with _ ->

     

       94
        
            (* Fallback: red square as RGBA *)

     

       95
        
            let red_data = solid_color_rgba ~width:100 ~height:100 ~r:255 ~g:0 ~b:0 ~a:255 in

     

       96
        
            send

     

       97
       +
              (K.transmit_and_display

     

       98
        
                 ~image_id:1

     

       99
        
                 ~format:`Rgba32

     

       100
        
                 ~width:100 ~height:100

     

       101
        
                 ~quiet:`Errors_only

     

       102
        
                 ())

     

       103
        
              ~data:red_data;

     

       104
       +
            print_endline "Red square displayed (camel.png not found)");

     

       105
        
         print_newline ();

     

       106
        
         wait_for_enter ();

     

       107
        
       

     
···

       110
        
         print_endline "Demo 2: Image Formats - RGBA format (32-bit)";

     

       111
        
         let blue_data = solid_color_rgba ~width:100 ~height:100 ~r:0 ~g:0 ~b:255 ~a:255 in

     

       112
        
         send

     

       113
       +
           (K.transmit_and_display

     

       114
        
              ~image_id:2

     

       115
        
              ~format:`Rgba32

     

       116
        
              ~width:100 ~height:100

     
···

       126
        
         print_endline "Demo 3: Image Formats - RGB format (24-bit)";

     

       127
        
         let green_data = solid_color_rgb ~width:100 ~height:100 ~r:0 ~g:255 ~b:0 in

     

       128
        
         send

     

       129
       +
           (K.transmit_and_display

     

       130
        
              ~image_id:3

     

       131
        
              ~format:`Rgb24

     

       132
        
              ~width:100 ~height:100

     
···

       142
        
         print_endline "Demo 4: Large Image (compression requires zlib library)";

     

       143
        
         let orange_data = solid_color_rgba ~width:200 ~height:200 ~r:255 ~g:165 ~b:0 ~a:255 in

     

       144
        
         send

     

       145
       +
           (K.transmit_and_display

     

       146
        
              ~image_id:4

     

       147
        
              ~format:`Rgba32

     

       148
        
              ~width:200 ~height:200

     
···

       155
        
       

     

       156
        
         (* Demo 5: Load and display external PNG file *)

     

       157
        
         clear_screen ();

     

       158
       +
         print_endline "Demo 5: Loading external PNG file (camel.png)";

     

       159
        
         (try

     

       160
       +
            let png_data = read_file "camel.png" in

     

       161
        
            send

     

       162
       +
              (K.transmit_and_display

     

       163
        
                 ~image_id:10

     

       164
        
                 ~format:`Png

     

       165
        
                 ~quiet:`Errors_only

     

       166
        
                 ())

     

       167
        
              ~data:png_data;

     

       168
       +
            print_endline "camel.png loaded and displayed"

     

       169
        
          with Sys_error msg ->

     

       170
       +
            Printf.printf "camel.png not found: %s\n" msg);

     

       171
        
         print_newline ();

     

       172
        
         wait_for_enter ();

     

       173
        
       

     
···

       176
        
         print_endline "Demo 6: Cropping and Scaling - Display part of an image";

     

       177
        
         let gradient = gradient_rgba ~width:200 ~height:200 in

     

       178
        
         send

     

       179
       +
           (K.transmit_and_display

     

       180
        
              ~image_id:20

     

       181
        
              ~format:`Rgba32

     

       182
        
              ~width:200 ~height:200

     
···

       198
        
         let cyan_data = solid_color_rgba ~width:80 ~height:80 ~r:0 ~g:255 ~b:255 ~a:255 in

     

       199
        
         (* Transmit once with an ID *)

     

       200
        
         send

     

       201
       +
           (K.transmit

     

       202
        
              ~image_id:100

     

       203
        
              ~format:`Rgba32

     

       204
        
              ~width:80 ~height:80

     
···

       207
        
           ~data:cyan_data;

     

       208
        
         (* Create first placement *)

     

       209
        
         send

     

       210
       +
           (K.display

     

       211
        
              ~image_id:100

     

       212
        
              ~placement:(K.Placement.make ~columns:10 ~rows:5 ())

     

       213
        
              ~quiet:`Errors_only

     
···

       215
        
           ~data:"";

     

       216
        
         (* Create second placement *)

     

       217
        
         send

     

       218
       +
           (K.display

     

       219
        
              ~image_id:100

     

       220
        
              ~placement:(K.Placement.make ~columns:5 ~rows:3 ())

     

       221
        
              ~quiet:`Errors_only

     
···

       234
        
         let grad_small = gradient_rgba ~width:100 ~height:100 in

     

       235
        
         (* Transmit once *)

     

       236
        
         send

     

       237
       +
           (K.transmit

     

       238
        
              ~image_id:160

     

       239
        
              ~format:`Rgba32

     

       240
        
              ~width:100 ~height:100

     
···

       243
        
           ~data:grad_small;

     

       244
        
         (* Place same image three times at different sizes *)

     

       245
        
         send

     

       246
       +
           (K.display

     

       247
        
              ~image_id:160

     

       248
        
              ~placement:(K.Placement.make ~columns:5 ~rows:5 ())

     

       249
        
              ~quiet:`Errors_only

     
···

       251
        
           ~data:"";

     

       252
        
         print_string "  ";

     

       253
        
         send

     

       254
       +
           (K.display

     

       255
        
              ~image_id:160

     

       256
        
              ~placement:(K.Placement.make ~columns:8 ~rows:8 ())

     

       257
        
              ~quiet:`Errors_only

     
···

       259
        
           ~data:"";

     

       260
        
         print_string "  ";

     

       261
        
         send

     

       262
       +
           (K.display

     

       263
        
              ~image_id:160

     

       264
        
              ~placement:(K.Placement.make ~columns:12 ~rows:12 ())

     

       265
        
              ~quiet:`Errors_only

     
···

       276
        
         print_endline "Demo 9: Z-Index Layering - Images above/below text";

     

       277
        
         let bg_data = solid_color_rgba ~width:200 ~height:100 ~r:255 ~g:165 ~b:0 ~a:128 in

     

       278
        
         send

     

       279
       +
           (K.transmit_and_display

     

       280
        
              ~image_id:200

     

       281
        
              ~format:`Rgba32

     

       282
        
              ~width:200 ~height:100

     
···

       309
        
         (* Create base frame (red) - transmit without displaying *)

     

       310
        
         let red_frame = solid_color_rgba ~width ~height ~r:255 ~g:0 ~b:0 ~a:255 in

     

       311
        
         send

     

       312
       +
           (K.transmit

     

       313
        
              ~image_id

     

       314
        
              ~format:`Rgba32

     

       315
        
              ~width ~height

     
···

       320
        
         (* Add frames with composition replace *)

     

       321
        
         let orange_frame = solid_color_rgba ~width ~height ~r:255 ~g:165 ~b:0 ~a:255 in

     

       322
        
         send

     

       323
       +
           (K.frame

     

       324
        
              ~image_id

     

       325
        
              ~format:`Rgba32

     

       326
        
              ~width ~height

     
···

       331
        
       

     

       332
        
         let yellow_frame = solid_color_rgba ~width ~height ~r:255 ~g:255 ~b:0 ~a:255 in

     

       333
        
         send

     

       334
       +
           (K.frame

     

       335
        
              ~image_id

     

       336
        
              ~format:`Rgba32

     

       337
        
              ~width ~height

     
···

       342
        
       

     

       343
        
         let green_frame = solid_color_rgba ~width ~height ~r:0 ~g:255 ~b:0 ~a:255 in

     

       344
        
         send

     

       345
       +
           (K.frame

     

       346
        
              ~image_id

     

       347
        
              ~format:`Rgba32

     

       348
        
              ~width ~height

     
···

       353
        
       

     

       354
        
         (* Create placement and start animation *)

     

       355
        
         send

     

       356
       +
           (K.display

     

       357
        
              ~image_id

     

       358
        
              ~placement:(K.Placement.make

     

       359
        
                            ~placement_id:1

     
···

       367
        
       

     

       368
        
         (* Set root frame gap - root frame has no gap by default per Kitty protocol *)

     

       369
        
         send

     

       370
       +
           (K.animate ~image_id (K.Animation.set_gap ~frame:1 ~gap_ms:100))

     

       371
        
           ~data:"";

     

       372
        
       

     

       373
        
         (* Start animation with infinite looping *)

     

       374
        
         send

     

       375
       +
           (K.animate ~image_id (K.Animation.set_state ~loops:1 `Run))

     

       376
        
           ~data:"";

     

       377
        
       

     

       378
        
         print_newline ();

     
···

       385
        
       

     

       386
        
           (* Delete the current placement *)

     

       387
        
           send

     

       388
       +
             (K.delete ~quiet:`Errors_only (`By_id (image_id, Some 1)))

     

       389
        
             ~data:"";

     

       390
        
       

     

       391
        
           (* Create new placement at next position *)

     

       392
        
           send

     

       393
       +
             (K.display

     

       394
        
                ~image_id

     

       395
        
                ~placement:(K.Placement.make

     

       396
        
                              ~placement_id:1

     
···

       405
        
       

     

       406
        
         (* Stop the animation *)

     

       407
        
         send

     

       408
       +
           (K.animate ~image_id (K.Animation.set_state `Stop))

     

       409
        
           ~data:"";

     

       410
        
       

     

       411
        
         print_endline "Animation stopped.";

-59

example/test_output.ml

···

       1
       -
       (* Simple test to show exact escape sequences without data *)

     

       2
       -
       

     

       3
       -
       module K = Kgp

     

       4
       -
       

     

       5
       -
       let print_escaped s =

     

       6
       -
         String.iter (fun c ->

     

       7
       -
           let code = Char.code c in

     

       8
       -
           if code = 27 then print_string "\\x1b"

     

       9
       -
           else if code < 32 || code > 126 then Printf.printf "\\x%02x" code

     

       10
       -
           else print_char c

     

       11
       -
         ) s;

     

       12
       -
         print_newline ()

     

       13
       -
       

     

       14
       -
       let () =

     

       15
       -
         let image_id = 300 in

     

       16
       -
         let width, height = 80, 80 in

     

       17
       -
       

     

       18
       -
         print_endline "=== Animation Escape Sequences (no data) ===\n";

     

       19
       -
       

     

       20
       -
         (* 1. Transmit base frame (no data for testing) *)

     

       21
       -
         print_endline "1. Transmit (a=t):";

     

       22
       -
         let cmd1 = K.Command.transmit

     

       23
       -
           ~image_id ~format:`Rgba32 ~width ~height ~quiet:`Errors_only () in

     

       24
       -
         print_escaped (K.Command.to_string cmd1 ~data:"");

     

       25
       -
       

     

       26
       -
         (* 2. Frame command *)

     

       27
       -
         print_endline "\n2. Frame (a=f):";

     

       28
       -
         let cmd2 = K.Command.frame

     

       29
       -
           ~image_id ~format:`Rgba32 ~width ~height

     

       30
       -
           ~frame:(K.Frame.make ~gap_ms:100 ~composition:`Overwrite ())

     

       31
       -
           ~quiet:`Errors_only () in

     

       32
       -
         print_escaped (K.Command.to_string cmd2 ~data:"");

     

       33
       -
       

     

       34
       -
         (* 3. Put/display command *)

     

       35
       -
         print_endline "\n3. Display/Put (a=p):";

     

       36
       -
         let cmd3 = K.Command.display

     

       37
       -
           ~image_id

     

       38
       -
           ~placement:(K.Placement.make

     

       39
       -
             ~placement_id:1

     

       40
       -
             ~cell_x_offset:0

     

       41
       -
             ~cell_y_offset:0

     

       42
       -
             ~cursor:`Static ())

     

       43
       -
           ~quiet:`Errors_only () in

     

       44
       -
         print_escaped (K.Command.to_string cmd3 ~data:"");

     

       45
       -
       

     

       46
       -
         (* 4. Set root frame gap - IMPORTANT for animation! *)

     

       47
       -
         print_endline "\n4. Set root frame gap (a=a, r=1, z=100):";

     

       48
       -
         let cmd4 = K.Command.animate ~image_id (K.Animation.set_gap ~frame:1 ~gap_ms:100) in

     

       49
       -
         print_escaped (K.Command.to_string cmd4 ~data:"");

     

       50
       -
       

     

       51
       -
         (* 5. Animate - start *)

     

       52
       -
         print_endline "\n5. Animate start (a=a, s=3, v=1):";

     

       53
       -
         let cmd5 = K.Command.animate ~image_id (K.Animation.set_state ~loops:1 `Run) in

     

       54
       -
         print_escaped (K.Command.to_string cmd5 ~data:"");

     

       55
       -
       

     

       56
       -
         (* 6. Animate - stop *)

     

       57
       -
         print_endline "\n6. Animate stop (a=a, s=1):";

     

       58
       -
         let cmd6 = K.Command.animate ~image_id (K.Animation.set_state `Stop) in

     

       59
       -
         print_escaped (K.Command.to_string cmd6 ~data:"")

example/test_output.mli

This is a binary file and will not be displayed.

+10 -10

example/tiny_anim.ml

···

       15
        
         Bytes.to_string pixels

     

       16
        
       

     

       17
        
       let send cmd ~data =

     

       18
       -
         print_string (K.Command.to_string cmd ~data);

     

       19
        
         flush stdout

     

       20
        
       

     

       21
        
       let () =

     
···

       24
        
         let image_id = 999 in

     

       25
        
       

     

       26
        
         (* Clear any existing images *)

     

       27
       -
         send (K.Command.delete ~free:true ~quiet:`Errors_only `All_visible) ~data:"";

     

       28
        
       

     

       29
        
         (* Step 1: Transmit base frame (red) - matching Go's sequence *)

     

       30
        
         let red_frame = solid_color_rgba ~width ~height ~r:255 ~g:0 ~b:0 ~a:255 in

     

       31
        
         send

     

       32
       -
           (K.Command.transmit

     

       33
        
              ~image_id

     

       34
        
              ~format:`Rgba32

     

       35
        
              ~width ~height

     
···

       40
        
         (* Step 2: Add frame (orange) with 100ms gap - like Go *)

     

       41
        
         let orange_frame = solid_color_rgba ~width ~height ~r:255 ~g:165 ~b:0 ~a:255 in

     

       42
        
         send

     

       43
       -
           (K.Command.frame

     

       44
        
              ~image_id

     

       45
        
              ~format:`Rgba32

     

       46
        
              ~width ~height

     
···

       52
        
         (* Step 3: Add frame (yellow) *)

     

       53
        
         let yellow_frame = solid_color_rgba ~width ~height ~r:255 ~g:255 ~b:0 ~a:255 in

     

       54
        
         send

     

       55
       -
           (K.Command.frame

     

       56
        
              ~image_id

     

       57
        
              ~format:`Rgba32

     

       58
        
              ~width ~height

     
···

       64
        
         (* Step 4: Add frame (green) *)

     

       65
        
         let green_frame = solid_color_rgba ~width ~height ~r:0 ~g:255 ~b:0 ~a:255 in

     

       66
        
         send

     

       67
       -
           (K.Command.frame

     

       68
        
              ~image_id

     

       69
        
              ~format:`Rgba32

     

       70
        
              ~width ~height

     
···

       75
        
       

     

       76
        
         (* Step 5: Create placement - exactly like Go *)

     

       77
        
         send

     

       78
       -
           (K.Command.display

     

       79
        
              ~image_id

     

       80
        
              ~placement:(K.Placement.make

     

       81
        
                            ~placement_id:1

     
···

       89
        
       

     

       90
        
         (* Step 6: Start animation - exactly like Go (NO root frame gap) *)

     

       91
        
         send

     

       92
       -
           (K.Command.animate ~image_id (K.Animation.set_state ~loops:1 `Run))

     

       93
        
           ~data:"";

     

       94
        
       

     

       95
        
         print_endline "";

     
···

       100
        
       

     

       101
        
         (* Stop animation *)

     

       102
        
         send

     

       103
       -
           (K.Command.animate ~image_id (K.Animation.set_state `Stop))

     

       104
        
           ~data:"";

     

       105
        
       

     

       106
        
         (* Clean up *)

     

       107
       -
         send (K.Command.delete ~free:true ~quiet:`Errors_only `All_visible) ~data:"";

     

       108
        
         print_endline "Done."

···

       15
        
         Bytes.to_string pixels

     

       16
        
       

     

       17
        
       let send cmd ~data =

     

       18
       +
         print_string (K.to_string cmd ~data);

     

       19
        
         flush stdout

     

       20
        
       

     

       21
        
       let () =

     
···

       24
        
         let image_id = 999 in

     

       25
        
       

     

       26
        
         (* Clear any existing images *)

     

       27
       +
         send (K.delete ~free:true ~quiet:`Errors_only `All_visible) ~data:"";

     

       28
        
       

     

       29
        
         (* Step 1: Transmit base frame (red) - matching Go's sequence *)

     

       30
        
         let red_frame = solid_color_rgba ~width ~height ~r:255 ~g:0 ~b:0 ~a:255 in

     

       31
        
         send

     

       32
       +
           (K.transmit

     

       33
        
              ~image_id

     

       34
        
              ~format:`Rgba32

     

       35
        
              ~width ~height

     
···

       40
        
         (* Step 2: Add frame (orange) with 100ms gap - like Go *)

     

       41
        
         let orange_frame = solid_color_rgba ~width ~height ~r:255 ~g:165 ~b:0 ~a:255 in

     

       42
        
         send

     

       43
       +
           (K.frame

     

       44
        
              ~image_id

     

       45
        
              ~format:`Rgba32

     

       46
        
              ~width ~height

     
···

       52
        
         (* Step 3: Add frame (yellow) *)

     

       53
        
         let yellow_frame = solid_color_rgba ~width ~height ~r:255 ~g:255 ~b:0 ~a:255 in

     

       54
        
         send

     

       55
       +
           (K.frame

     

       56
        
              ~image_id

     

       57
        
              ~format:`Rgba32

     

       58
        
              ~width ~height

     
···

       64
        
         (* Step 4: Add frame (green) *)

     

       65
        
         let green_frame = solid_color_rgba ~width ~height ~r:0 ~g:255 ~b:0 ~a:255 in

     

       66
        
         send

     

       67
       +
           (K.frame

     

       68
        
              ~image_id

     

       69
        
              ~format:`Rgba32

     

       70
        
              ~width ~height

     
···

       75
        
       

     

       76
        
         (* Step 5: Create placement - exactly like Go *)

     

       77
        
         send

     

       78
       +
           (K.display

     

       79
        
              ~image_id

     

       80
        
              ~placement:(K.Placement.make

     

       81
        
                            ~placement_id:1

     
···

       89
        
       

     

       90
        
         (* Step 6: Start animation - exactly like Go (NO root frame gap) *)

     

       91
        
         send

     

       92
       +
           (K.animate ~image_id (K.Animation.set_state ~loops:1 `Run))

     

       93
        
           ~data:"";

     

       94
        
       

     

       95
        
         print_endline "";

     
···

       100
        
       

     

       101
        
         (* Stop animation *)

     

       102
        
         send

     

       103
       +
           (K.animate ~image_id (K.Animation.set_state `Stop))

     

       104
        
           ~data:"";

     

       105
        
       

     

       106
        
         (* Clean up *)

     

       107
       +
         send (K.delete ~free:true ~quiet:`Errors_only `All_visible) ~data:"";

     

       108
        
         print_endline "Done."

example/tiny_anim.mli

This is a binary file and will not be displayed.

lib-cli/dune

···

       1
       +
       (library

     

       2
       +
        (name kgp_cli)

     

       3
       +
        (public_name kgp.cli)

     

       4
       +
        (libraries kgp cmdliner))

+23

lib-cli/kgp_cli.ml

···

       1
       +
       (* Cmdliner Support for Kitty Graphics Protocol *)

     

       2
       +
       

     

       3
       +
       open Cmdliner

     

       4
       +
       

     

       5
       +
       let graphics_docs = "GRAPHICS OPTIONS"

     

       6
       +
       

     

       7
       +
       let graphics_term =

     

       8
       +
         let doc = "Force graphics output enabled, ignoring terminal detection." in

     

       9
       +
         let enable = Arg.info ["g"; "graphics"] ~doc ~docs:graphics_docs in

     

       10
       +
         let doc = "Disable graphics output, use text placeholders instead." in

     

       11
       +
         let disable = Arg.info ["no-graphics"] ~doc ~docs:graphics_docs in

     

       12
       +
         let doc = "Force tmux passthrough mode for graphics." in

     

       13
       +
         let tmux = Arg.info ["tmux"] ~doc ~docs:graphics_docs in

     

       14
       +
         let choose enable disable tmux : Kgp.Terminal.graphics_mode =

     

       15
       +
           if enable then `Enabled

     

       16
       +
           else if disable then `Disabled

     

       17
       +
           else if tmux then `Tmux

     

       18
       +
           else `Auto

     

       19
       +
         in

     

       20
       +
         Term.(const choose

     

       21
       +
               $ Arg.(value & flag enable)

     

       22
       +
               $ Arg.(value & flag disable)

     

       23
       +
               $ Arg.(value & flag tmux))

+46

lib-cli/kgp_cli.mli

···

       1
       +
       (** Cmdliner Support for Kitty Graphics Protocol

     

       2
       +
       

     

       3
       +
           This module provides Cmdliner terms for configuring graphics output mode

     

       4
       +
           in CLI applications. It allows users to override auto-detection with

     

       5
       +
           command-line flags.

     

       6
       +
       

     

       7
       +
           {2 Usage}

     

       8
       +
       

     

       9
       +
           Add the graphics term to your command:

     

       10
       +
       

     

       11
       +
           {[

     

       12
       +
             let cmd =

     

       13
       +
               let graphics = Kgp_cli.graphics_term in

     

       14
       +
               let my_args = ... in

     

       15
       +
               Cmd.v info Term.(const my_run $ graphics $ my_args)

     

       16
       +
           ]}

     

       17
       +
       

     

       18
       +
           Then use the resolved mode in your application:

     

       19
       +
       

     

       20
       +
           {[

     

       21
       +
             let my_run graphics_mode args =

     

       22
       +
               if Kgp.Terminal.supports_graphics graphics_mode then

     

       23
       +
                 (* render with graphics *)

     

       24
       +
               else

     

       25
       +
                 (* use text fallback *)

     

       26
       +
           ]} *)

     

       27
       +
       

     

       28
       +
       (** {1 Terms} *)

     

       29
       +
       

     

       30
       +
       val graphics_term : Kgp.Terminal.graphics_mode Cmdliner.Term.t

     

       31
       +
       (** Cmdliner term for graphics mode selection.

     

       32
       +
       

     

       33
       +
           Provides the following command-line options:

     

       34
       +
       

     

       35
       +
           - [--graphics] / [-g]: Force graphics output enabled

     

       36
       +
           - [--no-graphics]: Force graphics output disabled (use placeholders)

     

       37
       +
           - [--tmux]: Force tmux passthrough mode

     

       38
       +
           - (default): Auto-detect based on terminal environment

     

       39
       +
       

     

       40
       +
           The term evaluates to a {!Kgp.Terminal.graphics_mode} value which can

     

       41
       +
           be passed to {!Kgp.Terminal.supports_graphics} or {!Kgp.Terminal.resolve_mode}. *)

     

       42
       +
       

     

       43
       +
       val graphics_docs : string

     

       44
       +
       (** Section name for graphics options in help output ("GRAPHICS OPTIONS").

     

       45
       +
       

     

       46
       +
           Use this when grouping graphics options in a separate help section. *)

+1 -1

lib/dune

···

       1
        
       (library

     

       2
        
        (name kgp)

     

       3
        
        (public_name kgp)

     

       4
       -
        (libraries base64))

···

       1
        
       (library

     

       2
        
        (name kgp)

     

       3
        
        (public_name kgp)

     

       4
       +
        (libraries base64 unix))

+4 -3

lib/kgp.ml

···

       1
       -
       (* Kitty Terminal Graphics Protocol - Main Module *)

     

       2
       -
       

     

       3
        
       (* Type modules *)

     

       4
        
       module Format = Kgp_format

     

       5
        
       module Transmission = Kgp_transmission

     
···

       29
        
       let compose = Kgp_command.compose

     

       30
        
       let write = Kgp_command.write

     

       31
        
       let to_string = Kgp_command.to_string

     

       0
        
       
     

       0
        
       
     

       32
        
       

     

       33
        
       (* Core modules *)

     

       34
       -
       module Command = Kgp_command

     

       35
        
       module Response = Kgp_response

     

       36
        
       

     

       37
        
       (* Utility modules *)

     

       38
        
       module Unicode_placeholder = Kgp_unicode

     

       39
        
       module Detect = Kgp_detect

     

       0
        
       
     

       0

···

       0
        
       
     

       0
        
       
     

       1
        
       (* Type modules *)

     

       2
        
       module Format = Kgp_format

     

       3
        
       module Transmission = Kgp_transmission

     
···

       27
        
       let compose = Kgp_command.compose

     

       28
        
       let write = Kgp_command.write

     

       29
        
       let to_string = Kgp_command.to_string

     

       30
       +
       let write_tmux = Kgp_command.write_tmux

     

       31
       +
       let to_string_tmux = Kgp_command.to_string_tmux

     

       32
        
       

     

       33
        
       (* Core modules *)

     

       0
        
       
     

       34
        
       module Response = Kgp_response

     

       35
        
       

     

       36
        
       (* Utility modules *)

     

       37
        
       module Unicode_placeholder = Kgp_unicode

     

       38
        
       module Detect = Kgp_detect

     

       39
       +
       module Tmux = Kgp_tmux

     

       40
       +
       module Terminal = Kgp_terminal

+23 -5

lib/kgp.mli

···

       19
        
       

     

       20
        
           All graphics commands use the Application Programming Command (APC) format:

     

       21
        
       

     

       22
       -
           {v <ESC>_G<control data>;<payload><ESC>\ v}

     

       23
        
       

     

       24
        
           Where:

     

       25
        
           - [ESC _G] is the APC start sequence (bytes 0x1B 0x5F 0x47)

     
···

       336
        
           Convenience wrapper around {!write} that returns the serialized

     

       337
        
           command as a string. *)

     

       338
        
       

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       339
        
       (** {1 Response} *)

     

       340
        
       

     

       341
        
       module Response = Kgp_response

     
···

       345
        
       module Unicode_placeholder = Kgp_unicode

     

       346
        
       module Detect = Kgp_detect

     

       347
        
       

     

       348
       -
       (** {1 Low-level Access} *)

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       349
        
       

     

       350
       -
       module Command = Kgp_command

     

       351
       -
       (** Low-level command module. The command functions are also available

     

       352
       -
           at the top level of this module for convenience. *)

···

       19
        
       

     

       20
        
           All graphics commands use the Application Programming Command (APC) format:

     

       21
        
       

     

       22
       +
           {v <ESC>_G<control data>;<payload><ESC> v}

     

       23
        
       

     

       24
        
           Where:

     

       25
        
           - [ESC _G] is the APC start sequence (bytes 0x1B 0x5F 0x47)

     
···

       336
        
           Convenience wrapper around {!write} that returns the serialized

     

       337
        
           command as a string. *)

     

       338
        
       

     

       339
       +
       val write_tmux : Buffer.t -> command -> data:string -> unit

     

       340
       +
       (** Write the command to a buffer with tmux passthrough support.

     

       341
       +
       

     

       342
       +
           If running inside tmux (detected via [TMUX] environment variable),

     

       343
       +
           wraps the graphics command in a DCS passthrough sequence so it

     

       344
       +
           reaches the underlying terminal. Otherwise, behaves like {!write}.

     

       345
       +
       

     

       346
       +
           Requires tmux 3.3+ with [allow-passthrough] enabled. *)

     

       347
       +
       

     

       348
       +
       val to_string_tmux : command -> data:string -> string

     

       349
       +
       (** Convert command to a string with tmux passthrough support.

     

       350
       +
       

     

       351
       +
           Convenience wrapper around {!write_tmux}. If running inside tmux,

     

       352
       +
           wraps the output for passthrough. Otherwise, behaves like {!to_string}. *)

     

       353
       +
       

     

       354
        
       (** {1 Response} *)

     

       355
        
       

     

       356
        
       module Response = Kgp_response

     
···

       360
        
       module Unicode_placeholder = Kgp_unicode

     

       361
        
       module Detect = Kgp_detect

     

       362
        
       

     

       363
       +
       module Tmux = Kgp_tmux

     

       364
       +
       (** Tmux passthrough support. Provides functions to detect if running

     

       365
       +
           inside tmux and to wrap escape sequences for passthrough. *)

     

       366
       +
       

     

       367
       +
       module Terminal = Kgp_terminal

     

       368
       +
       (** Terminal environment detection. Provides functions to detect terminal

     

       369
       +
           capabilities, pager mode, and resolve graphics output mode. *)

     

       370
        
       

     

       0
        
       
     

       0
        
       
     

       0

+13

lib/kgp_command.ml

···

       305
        
         let buf = Buffer.create 1024 in

     

       306
        
         write buf cmd ~data;

     

       307
        
         Buffer.contents buf

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0

···

       305
        
         let buf = Buffer.create 1024 in

     

       306
        
         write buf cmd ~data;

     

       307
        
         Buffer.contents buf

     

       308
       +
       

     

       309
       +
       let write_tmux buf cmd ~data =

     

       310
       +
         if Kgp_tmux.is_active () then begin

     

       311
       +
           let inner_buf = Buffer.create 1024 in

     

       312
       +
           write inner_buf cmd ~data;

     

       313
       +
           Kgp_tmux.write_wrapped buf (Buffer.contents inner_buf)

     

       314
       +
         end else

     

       315
       +
           write buf cmd ~data

     

       316
       +
       

     

       317
       +
       let to_string_tmux cmd ~data =

     

       318
       +
         let buf = Buffer.create 1024 in

     

       319
       +
         write_tmux buf cmd ~data;

     

       320
       +
         Buffer.contents buf

+13

lib/kgp_command.mli

···

       108
        
       

     

       109
        
       val to_string : t -> data:string -> string

     

       110
        
       (** Convert command to a string. *)

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0

···

       108
        
       

     

       109
        
       val to_string : t -> data:string -> string

     

       110
        
       (** Convert command to a string. *)

     

       111
       +
       

     

       112
       +
       val write_tmux : Buffer.t -> t -> data:string -> unit

     

       113
       +
       (** Write the command to a buffer with tmux passthrough wrapping.

     

       114
       +
       

     

       115
       +
           If running inside tmux (detected via [TMUX] environment variable),

     

       116
       +
           wraps the graphics command in a DCS passthrough sequence. Otherwise,

     

       117
       +
           behaves like {!write}. *)

     

       118
       +
       

     

       119
       +
       val to_string_tmux : t -> data:string -> string

     

       120
       +
       (** Convert command to a string with tmux passthrough wrapping.

     

       121
       +
       

     

       122
       +
           If running inside tmux, wraps the output for passthrough.

     

       123
       +
           Otherwise, behaves like {!to_string}. *)

+59

lib/kgp_terminal.ml

···

       1
       +
       (* Terminal Environment Detection *)

     

       2
       +
       

     

       3
       +
       type graphics_mode = [ `Auto | `Enabled | `Disabled | `Tmux ]

     

       4
       +
       

     

       5
       +
       let is_kitty () =

     

       6
       +
         Option.is_some (Sys.getenv_opt "KITTY_WINDOW_ID") ||

     

       7
       +
         (match Sys.getenv_opt "TERM" with

     

       8
       +
          | Some term -> String.lowercase_ascii term = "xterm-kitty"

     

       9
       +
          | None -> false) ||

     

       10
       +
         (match Sys.getenv_opt "TERM_PROGRAM" with

     

       11
       +
          | Some prog -> String.lowercase_ascii prog = "kitty"

     

       12
       +
          | None -> false)

     

       13
       +
       

     

       14
       +
       let is_wezterm () =

     

       15
       +
         Option.is_some (Sys.getenv_opt "WEZTERM_PANE") ||

     

       16
       +
         (match Sys.getenv_opt "TERM_PROGRAM" with

     

       17
       +
          | Some prog -> String.lowercase_ascii prog = "wezterm"

     

       18
       +
          | None -> false)

     

       19
       +
       

     

       20
       +
       let is_ghostty () =

     

       21
       +
         Option.is_some (Sys.getenv_opt "GHOSTTY_RESOURCES_DIR") ||

     

       22
       +
         (match Sys.getenv_opt "TERM_PROGRAM" with

     

       23
       +
          | Some prog -> String.lowercase_ascii prog = "ghostty"

     

       24
       +
          | None -> false)

     

       25
       +
       

     

       26
       +
       let is_graphics_terminal () =

     

       27
       +
         is_kitty () || is_wezterm () || is_ghostty ()

     

       28
       +
       

     

       29
       +
       let is_tmux () = Kgp_tmux.is_active ()

     

       30
       +
       

     

       31
       +
       let is_interactive () =

     

       32
       +
         Unix.isatty Unix.stdout

     

       33
       +
       

     

       34
       +
       let is_pager () =

     

       35
       +
         (* Not interactive = likely piped to pager *)

     

       36
       +
         not (is_interactive ()) ||

     

       37
       +
         (* PAGER set and not in a known graphics terminal *)

     

       38
       +
         (Option.is_some (Sys.getenv_opt "PAGER") && not (is_graphics_terminal ()))

     

       39
       +
       

     

       40
       +
       let resolve_mode = function

     

       41
       +
         | `Disabled -> `Placeholder

     

       42
       +
         | `Enabled -> `Graphics

     

       43
       +
         | `Tmux -> `Tmux

     

       44
       +
         | `Auto ->

     

       45
       +
           if is_pager () || not (is_interactive ()) then

     

       46
       +
             `Placeholder

     

       47
       +
           else if is_tmux () then

     

       48
       +
             (* Inside tmux - use passthrough if underlying terminal supports graphics *)

     

       49
       +
             if is_graphics_terminal () then `Tmux

     

       50
       +
             else `Placeholder

     

       51
       +
           else if is_graphics_terminal () then

     

       52
       +
             `Graphics

     

       53
       +
           else

     

       54
       +
             `Placeholder

     

       55
       +
       

     

       56
       +
       let supports_graphics mode =

     

       57
       +
         match resolve_mode mode with

     

       58
       +
         | `Graphics | `Tmux -> true

     

       59
       +
         | `Placeholder -> false

+80

lib/kgp_terminal.mli

···

       1
       +
       (** Terminal Environment Detection

     

       2
       +
       

     

       3
       +
           Detect terminal capabilities and environment for graphics protocol support.

     

       4
       +
       

     

       5
       +
           {2 Supported Terminals}

     

       6
       +
       

     

       7
       +
           The following terminals support the Kitty Graphics Protocol:

     

       8
       +
           - Kitty (the original implementation)

     

       9
       +
           - WezTerm

     

       10
       +
           - Ghostty

     

       11
       +
           - Konsole (partial support)

     

       12
       +
       

     

       13
       +
           {2 Environment Detection}

     

       14
       +
       

     

       15
       +
           Detection is based on environment variables:

     

       16
       +
           - [KITTY_WINDOW_ID] - set by Kitty

     

       17
       +
           - [WEZTERM_PANE] - set by WezTerm

     

       18
       +
           - [GHOSTTY_RESOURCES_DIR] - set by Ghostty

     

       19
       +
           - [TERM_PROGRAM] - may contain terminal name

     

       20
       +
           - [TERM] - may contain "kitty"

     

       21
       +
           - [TMUX] - set when inside tmux

     

       22
       +
           - [PAGER] / output to non-tty - indicates pager mode *)

     

       23
       +
       

     

       24
       +
       (** {1 Graphics Mode} *)

     

       25
       +
       

     

       26
       +
       type graphics_mode = [ `Auto | `Enabled | `Disabled | `Tmux ]

     

       27
       +
       (** Graphics output mode.

     

       28
       +
       

     

       29
       +
           - [`Auto] - Auto-detect based on environment

     

       30
       +
           - [`Enabled] - Force graphics enabled

     

       31
       +
           - [`Disabled] - Force graphics disabled (use placeholders)

     

       32
       +
           - [`Tmux] - Force tmux passthrough mode *)

     

       33
       +
       

     

       34
       +
       (** {1 Detection} *)

     

       35
       +
       

     

       36
       +
       val is_kitty : unit -> bool

     

       37
       +
       (** Detect if running in Kitty terminal. *)

     

       38
       +
       

     

       39
       +
       val is_wezterm : unit -> bool

     

       40
       +
       (** Detect if running in WezTerm terminal. *)

     

       41
       +
       

     

       42
       +
       val is_ghostty : unit -> bool

     

       43
       +
       (** Detect if running in Ghostty terminal. *)

     

       44
       +
       

     

       45
       +
       val is_graphics_terminal : unit -> bool

     

       46
       +
       (** Detect if running in any terminal that supports the graphics protocol. *)

     

       47
       +
       

     

       48
       +
       val is_tmux : unit -> bool

     

       49
       +
       (** Detect if running inside tmux. *)

     

       50
       +
       

     

       51
       +
       val is_pager : unit -> bool

     

       52
       +
       (** Detect if output is likely going to a pager.

     

       53
       +
       

     

       54
       +
           Returns [true] if:

     

       55
       +
           - stdout is not a tty, or

     

       56
       +
           - [PAGER] environment variable is set and we're not in a known

     

       57
       +
             graphics-capable terminal *)

     

       58
       +
       

     

       59
       +
       val is_interactive : unit -> bool

     

       60
       +
       (** Detect if running interactively (stdout is a tty). *)

     

       61
       +
       

     

       62
       +
       (** {1 Mode Resolution} *)

     

       63
       +
       

     

       64
       +
       val resolve_mode : graphics_mode -> [ `Graphics | `Tmux | `Placeholder ]

     

       65
       +
       (** Resolve a graphics mode to the actual output method.

     

       66
       +
       

     

       67
       +
           - [`Graphics] - use direct graphics protocol

     

       68
       +
           - [`Tmux] - use graphics protocol with tmux passthrough

     

       69
       +
           - [`Placeholder] - use text placeholders (block characters)

     

       70
       +
       

     

       71
       +
           For [Auto] mode:

     

       72
       +
           - If in a pager or non-interactive: [`Placeholder]

     

       73
       +
           - If in tmux with graphics terminal: [`Tmux]

     

       74
       +
           - If in graphics terminal: [`Graphics]

     

       75
       +
           - Otherwise: [`Placeholder] *)

     

       76
       +
       

     

       77
       +
       val supports_graphics : graphics_mode -> bool

     

       78
       +
       (** Check if the resolved mode supports graphics output.

     

       79
       +
       

     

       80
       +
           Returns [true] for [`Graphics] and [`Tmux], [false] for [`Placeholder]. *)

+23

lib/kgp_tmux.ml

···

       1
       +
       (* Tmux Passthrough Support - Implementation *)

     

       2
       +
       

     

       3
       +
       let is_active () =

     

       4
       +
         Option.is_some (Sys.getenv_opt "TMUX")

     

       5
       +
       

     

       6
       +
       let write_wrapped buf s =

     

       7
       +
         (* DCS passthrough prefix: ESC P tmux ; *)

     

       8
       +
         Buffer.add_string buf "\027Ptmux;";

     

       9
       +
         (* Double all ESC characters in the content *)

     

       10
       +
         String.iter (fun c ->

     

       11
       +
           if c = '\027' then Buffer.add_string buf "\027\027"

     

       12
       +
           else Buffer.add_char buf c

     

       13
       +
         ) s;

     

       14
       +
         (* DCS terminator: ESC \ *)

     

       15
       +
         Buffer.add_string buf "\027\\"

     

       16
       +
       

     

       17
       +
       let wrap_always s =

     

       18
       +
         let buf = Buffer.create (String.length s * 2 + 10) in

     

       19
       +
         write_wrapped buf s;

     

       20
       +
         Buffer.contents buf

     

       21
       +
       

     

       22
       +
       let wrap s =

     

       23
       +
         if is_active () then wrap_always s else s

+63

lib/kgp_tmux.mli

···

       1
       +
       (** Tmux Passthrough Support

     

       2
       +
       

     

       3
       +
           Support for passing graphics protocol escape sequences through tmux

     

       4
       +
           to the underlying terminal emulator.

     

       5
       +
       

     

       6
       +
           {2 Background}

     

       7
       +
       

     

       8
       +
           When running inside tmux, graphics protocol escape sequences need to be

     

       9
       +
           wrapped in a DCS (Device Control String) passthrough sequence so that

     

       10
       +
           tmux forwards them to the actual terminal (kitty, wezterm, ghostty, etc.)

     

       11
       +
           rather than interpreting them itself.

     

       12
       +
       

     

       13
       +
           The passthrough format is:

     

       14
       +
           - Prefix: [ESC P tmux ;]

     

       15
       +
           - Content with all ESC characters doubled

     

       16
       +
           - Suffix: [ESC]

     

       17
       +
       

     

       18
       +
           {2 Requirements}

     

       19
       +
       

     

       20
       +
           For tmux passthrough to work:

     

       21
       +
           - tmux version 3.3 or later

     

       22
       +
           - [allow-passthrough] must be enabled in tmux.conf:

     

       23
       +
             {v set -g allow-passthrough on v}

     

       24
       +
       

     

       25
       +
           {2 Usage}

     

       26
       +
       

     

       27
       +
           {[

     

       28
       +
             if Kgp.Tmux.is_active () then

     

       29
       +
               let wrapped = Kgp.Tmux.wrap graphics_command in

     

       30
       +
               print_string wrapped

     

       31
       +
             else

     

       32
       +
               print_string graphics_command

     

       33
       +
           ]} *)

     

       34
       +
       

     

       35
       +
       val is_active : unit -> bool

     

       36
       +
       (** Detect if we are running inside tmux.

     

       37
       +
       

     

       38
       +
           Returns [true] if the [TMUX] environment variable is set,

     

       39
       +
           indicating the process is running inside a tmux session. *)

     

       40
       +
       

     

       41
       +
       val wrap : string -> string

     

       42
       +
       (** Wrap an escape sequence for tmux passthrough.

     

       43
       +
       

     

       44
       +
           Takes a graphics protocol escape sequence and wraps it in the

     

       45
       +
           tmux DCS passthrough format:

     

       46
       +
           - Adds [ESC P tmux ;] prefix

     

       47
       +
           - Doubles all ESC characters in the content

     

       48
       +
           - Adds [ESC] suffix

     

       49
       +
       

     

       50
       +
           If not running inside tmux, returns the input unchanged. *)

     

       51
       +
       

     

       52
       +
       val wrap_always : string -> string

     

       53
       +
       (** Wrap an escape sequence for tmux passthrough unconditionally.

     

       54
       +
       

     

       55
       +
           Like {!wrap} but always applies the wrapping, regardless of

     

       56
       +
           whether we are inside tmux. Useful when you want to pre-generate

     

       57
       +
           tmux-compatible output. *)

     

       58
       +
       

     

       59
       +
       val write_wrapped : Buffer.t -> string -> unit

     

       60
       +
       (** Write a wrapped escape sequence directly to a buffer.

     

       61
       +
       

     

       62
       +
           More efficient than {!wrap_always} when building output in a buffer,

     

       63
       +
           as it avoids allocating an intermediate string. *)

+15 -8

lib/kgp_unicode.ml

···

       44
        
       let column_diacritic = diacritic

     

       45
        
       let id_high_byte_diacritic = diacritic

     

       46
        
       

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       47
        
       let add_uchar buf u =

     

       48
        
         let code = Uchar.to_int u in

     

       49
        
         let put = Buffer.add_char buf in

     
···

       62
        
           put (Char.chr (0x80 lor (code land 0x3F))))

     

       63
        
       

     

       64
        
       let write buf ~image_id ?placement_id ~rows ~cols () =

     

       65
       -
         (* Set foreground color *)

     

       66
       -
         Printf.bprintf buf "\027[38;2;%d;%d;%dm"

     

       67
        
           ((image_id lsr 16) land 0xFF)

     

       68
        
           ((image_id lsr 8) land 0xFF)

     

       69
        
           (image_id land 0xFF);

     

       70
        
         (* Optional placement ID in underline color *)

     

       71
        
         placement_id

     

       72
        
         |> Option.iter (fun pid ->

     

       73
       -
                Printf.bprintf buf "\027[58;2;%d;%d;%dm"

     

       74
        
                  ((pid lsr 16) land 0xFF)

     

       75
        
                  ((pid lsr 8) land 0xFF)

     

       76
        
                  (pid land 0xFF));

     

       77
       -
         (* High byte diacritic *)

     

       78
        
         let high_byte = (image_id lsr 24) land 0xFF in

     

       79
       -
         let high_diac =

     

       80
       -
           if high_byte > 0 then Some (id_high_byte_diacritic high_byte) else None

     

       81
       -
         in

     

       82
        
         (* Write grid *)

     

       83
        
         for row = 0 to rows - 1 do

     

       84
        
           for col = 0 to cols - 1 do

     

       85
        
             add_uchar buf placeholder_char;

     

       86
        
             add_uchar buf (row_diacritic row);

     

       87
        
             add_uchar buf (column_diacritic col);

     

       88
       -
             high_diac |> Option.iter (add_uchar buf)

     

       89
        
           done;

     

       90
        
           if row < rows - 1 then Buffer.add_string buf "\n\r"

     

       91
        
         done;

···

       44
        
       let column_diacritic = diacritic

     

       45
        
       let id_high_byte_diacritic = diacritic

     

       46
        
       

     

       47
       +
       let next_image_id () =

     

       48
       +
         let rec gen () =

     

       49
       +
           let id = Random.int32 Int32.max_int |> Int32.to_int in

     

       50
       +
           (* Ensure high byte and middle bytes are non-zero *)

     

       51
       +
           if id land 0xFF000000 = 0 || id land 0x00FFFF00 = 0 then gen ()

     

       52
       +
           else id

     

       53
       +
         in

     

       54
       +
         gen ()

     

       55
       +
       

     

       56
        
       let add_uchar buf u =

     

       57
        
         let code = Uchar.to_int u in

     

       58
        
         let put = Buffer.add_char buf in

     
···

       71
        
           put (Char.chr (0x80 lor (code land 0x3F))))

     

       72
        
       

     

       73
        
       let write buf ~image_id ?placement_id ~rows ~cols () =

     

       74
       +
         (* Set foreground color using colon subparameter format *)

     

       75
       +
         Printf.bprintf buf "\027[38:2:%d:%d:%dm"

     

       76
        
           ((image_id lsr 16) land 0xFF)

     

       77
        
           ((image_id lsr 8) land 0xFF)

     

       78
        
           (image_id land 0xFF);

     

       79
        
         (* Optional placement ID in underline color *)

     

       80
        
         placement_id

     

       81
        
         |> Option.iter (fun pid ->

     

       82
       +
                Printf.bprintf buf "\027[58:2:%d:%d:%dm"

     

       83
        
                  ((pid lsr 16) land 0xFF)

     

       84
        
                  ((pid lsr 8) land 0xFF)

     

       85
        
                  (pid land 0xFF));

     

       86
       +
         (* High byte diacritic - always written, even when 0 *)

     

       87
        
         let high_byte = (image_id lsr 24) land 0xFF in

     

       88
       +
         let id_diac = id_high_byte_diacritic high_byte in

     

       0
        
       
     

       0
        
       
     

       89
        
         (* Write grid *)

     

       90
        
         for row = 0 to rows - 1 do

     

       91
        
           for col = 0 to cols - 1 do

     

       92
        
             add_uchar buf placeholder_char;

     

       93
        
             add_uchar buf (row_diacritic row);

     

       94
        
             add_uchar buf (column_diacritic col);

     

       95
       +
             add_uchar buf id_diac

     

       96
        
           done;

     

       97
        
           if row < rows - 1 then Buffer.add_string buf "\n\r"

     

       98
        
         done;

+26 -2

lib/kgp_unicode.mli

···

       1
        
       (** Kitty Graphics Protocol Unicode Placeholders

     

       2
        
       

     

       3
        
           Support for invisible Unicode placeholder characters that encode

     

       4
       -
           image position metadata for accessibility and compatibility. *)

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       5
        
       

     

       6
        
       val placeholder_char : Uchar.t

     

       7
        
       (** The Unicode placeholder character U+10EEEE. *)

     

       8
        
       

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       9
        
       val write :

     

       10
        
         Buffer.t ->

     

       11
        
         image_id:int ->

     
···

       14
        
         cols:int ->

     

       15
        
         unit ->

     

       16
        
         unit

     

       17
       -
       (** Write placeholder characters to a buffer. *)

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       18
        
       

     

       19
        
       val row_diacritic : int -> Uchar.t

     

       20
        
       (** Get the combining diacritic for a row number (0-based). *)

···

       1
        
       (** Kitty Graphics Protocol Unicode Placeholders

     

       2
        
       

     

       3
        
           Support for invisible Unicode placeholder characters that encode

     

       4
       +
           image position metadata for accessibility and compatibility.

     

       5
       +
       

     

       6
       +
           {2 Image ID Requirements}

     

       7
       +
       

     

       8
       +
           When using unicode placeholders, image IDs must have non-zero bytes in

     

       9
       +
           specific positions for correct rendering:

     

       10
       +
           - High byte (bits 24-31): encoded as the third combining diacritic

     

       11
       +
           - Middle bytes (bits 8-23): encoded in the foreground RGB color

     

       12
       +
       

     

       13
       +
           Use {!next_image_id} to generate IDs that satisfy these requirements. *)

     

       14
        
       

     

       15
        
       val placeholder_char : Uchar.t

     

       16
        
       (** The Unicode placeholder character U+10EEEE. *)

     

       17
        
       

     

       18
       +
       val next_image_id : unit -> int

     

       19
       +
       (** Generate a random image ID suitable for unicode placeholders.

     

       20
       +
       

     

       21
       +
           The returned ID has non-zero bytes in all required positions:

     

       22
       +
           - High byte (bits 24-31) is non-zero

     

       23
       +
           - Middle bytes (bits 8-23) are non-zero

     

       24
       +
       

     

       25
       +
           This ensures the foreground color encoding and diacritic encoding

     

       26
       +
           work correctly. Uses [Random] internally. *)

     

       27
       +
       

     

       28
        
       val write :

     

       29
        
         Buffer.t ->

     

       30
        
         image_id:int ->

     
···

       33
        
         cols:int ->

     

       34
        
         unit ->

     

       35
        
         unit

     

       36
       +
       (** Write placeholder characters to a buffer.

     

       37
       +
       

     

       38
       +
           @param image_id Should be generated with {!next_image_id} for correct rendering.

     

       39
       +
           @param placement_id Optional placement ID for multiple placements of same image.

     

       40
       +
           @param rows Number of rows in the placeholder grid.

     

       41
       +
           @param cols Number of columns in the placeholder grid. *)

     

       42
        
       

     

       43
        
       val row_diacritic : int -> Uchar.t

     

       44
        
       (** Get the combining diacritic for a row number (0-based). *)