commit cbf04400531a7a91c4f91b8f6b5c2cc7fc74d78c · patrick.sirref.org/shelter

attic/dune

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       ; (executables

     

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       ;  (names main task)

     

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       ;  (libraries base eio_posix shelter.main))

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attic/main.ml

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       module type Applicative = sig

     

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         type 'a t

     

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         val return : 'a -> 'a t

     

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         val fmap : ('a -> 'b) -> 'a t -> 'b t

     

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         val mbind : ('a -> 'b t) -> 'a t -> 'b t

     

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         val apply : ('a -> 'b) t -> 'a t -> 'b t

     

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       end

     

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       module type Selective = sig

     

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         include Applicative

     

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         val select : ('a, 'b) Either.t t -> ('a -> 'b) t -> 'b t

     

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       end

     

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       module T (A : Applicative) = struct

     

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         let do_thing (a : _ A.t) (v : _ A.t) =

     

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           let v1 = A.mbind (fun i -> if Random.int i < 5 then A.mbind (fun v -> A.return @@ v ^ "hello") v else A.return "world") a in

     

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           let v2 = A.fmap (fun i -> if Random.int i < 5 then "hello" else "world") a in

     

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           v1, v2

     

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       end

     

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       module Make (S : Selective) = struct

     

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         include S

     

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         let ( <*? ) x f = S.select x f

     

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         let map ~f x = apply (return f) x

     

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         let branch x l r =

     

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           map x ~f:(Either.map ~left:Fun.id ~right:Either.left)

     

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           <*? map l ~f:(Fun.compose Either.right)

     

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           <*? r

     

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         let if' x t f =

     

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           branch

     

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             (map x ~f:(fun b -> if b then Either.Left () else Either.Right ()))

     

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             (map t ~f:Fun.const) (map f ~f:Fun.const)

     

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         let when' x act = if' x act (return ())

     

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         let ( <||> ) a b = if' a (return true) b

     

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         let ( <&&> ) a b = if' a b (return false)

     

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       end

     

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       module Shl (S : Selective) = struct

     

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         module Select = struct

     

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           include Make (S)

     

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         end

     

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         module Shelter = Shelter_main

     

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         type step =

     

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           | From : string -> step

     

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           | Run : string -> step

     

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           | Copy : string * string -> step

     

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           | Parallel : string list -> step

     

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         type 'a with_session = { session : string; step : 'a }

     

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         type 'a llist = Singleton of 'a | Cons of 'a * 'a llist

     

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         let rec map f = function

     

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           | Singleton v -> Singleton (f v)

     

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           | Cons (x, xs) -> Cons (f x, map f xs)

     

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         type t = step with_session llist

     

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         let from image =

     

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           Select.return (Singleton { session = "main"; step = From image })

     

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         let run cmd =

     

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           Select.return (function (Singleton prev | Cons (prev, _)) as l ->

     

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               Cons ({ prev with step = Run cmd }, l))

     

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         let copy ~src ~dst = Select.return (Copy (src, dst))

     

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         let session session =

     

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           Select.return (function (Singleton step | Cons (step, _)) as l ->

     

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               Cons ({ step with session }, l))

     

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         let with_session session = Select.return (map (fun v -> { v with session }))

     

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         let rec to_list = function

     

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           | Singleton v -> [ v ]

     

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           | Cons (x, xs) -> x :: to_list xs

     

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         let stdout _ = "" 

     

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         let build steps =

     

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           Select.apply

     

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             (Select.return (fun steps ->

     

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                  to_list steps |> List.rev

     

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                  |> List.map (function

     

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                       | { session; step = From from } ->

     

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                           Printf.sprintf "(%s) FROM %s" session from

     

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                       | { session; step = Run cmd } ->

     

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                           Printf.sprintf "(%s) RUN %s" session cmd

     

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                       | { session; step = Copy (src, dst) } ->

     

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                           Printf.sprintf "(%s) COPY %s %s" session src dst

     

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                       | _ -> assert false)

     

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                  |> String.concat "\n"))

     

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             steps

     

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       end

     

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       module Identity = Make (struct

     

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         type 'a t = 'a

     

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         let return x = x

     

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         let apply f x = f x

     

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         let select e f = match e with Either.Left v -> f v | Either.Right b -> b

     

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       end)

     

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       module D = Shl (Identity)

     

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       let dockerfile =

     

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         let open D in

     

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         let base_image = from "alpine" in

     

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         let is_node_lst img = String.equal "v22.15.0" (stdout img) in

     

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         let cmds base =

     

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           let node_version = run "node --version" base in

     

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           Select.if'

     

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             (Select.map ~f:is_node_lst node_version)

     

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             (run "node -e 'console.log('success!')")

     

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             (run "node -e 'console.log('failure!')")

     

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             base

     

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         in

     

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         with_session "node" (cmds base_image)

     

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       let () = print_endline (D.build dockerfile)

+106

attic/task.ml

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       (* Work in progress, prototyped in https://try.ocamlpro.com/. To be modified

     

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          for Base. *)

     

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       module type Applicative = sig

     

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         type 'a t

     

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         val return : 'a -> 'a t

     

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         val apply : ('a -> 'b) t -> 'a t -> 'b t

     

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       end

     

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       module type Selective = sig

     

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         include Applicative

     

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         val select : ('a, 'b) Either.t t -> ('a -> 'b) t -> 'b t

     

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       end

     

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       module Make (S : Selective) = struct

     

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         include S

     

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         let ( <*? ) x f = S.select x f

     

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         let map ~f x = apply (return f) x

     

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         let branch x l r =

     

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           map x ~f:(Either.map ~left:Fun.id ~right:Either.left)

     

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           <*? map l ~f:(Fun.compose Either.right)

     

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           <*? r

     

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         let if' x t f =

     

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           branch

     

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             (map x ~f:(fun b -> if b then Either.Left () else Either.Right ()))

     

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             (map t ~f:Fun.const) (map f ~f:Fun.const)

     

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         let when' x act = if' x act (return ())

     

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         let ( <||> ) a b = if' a (return true) b

     

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         let ( <&&> ) a b = if' a b (return false)

     

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       end

     

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       module type Task = sig

     

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         type k

     

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         type v

     

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         val exec : k -> v

     

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         module Make (S : Selective) : sig

     

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           val run : (k -> v S.t) -> v S.t

     

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         end

     

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       end

     

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       module Example : Task with type k = string and type v = int = struct

     

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         type k = string

     

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         type v = int

     

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         let exec s = Sys.command s

     

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         module Make (Select : Selective) = struct

     

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           module S = Make (Select)

     

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           let run exec =

     

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             S.if'

     

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               (S.map (exec "node") ~f:(fun x -> x = 0))

     

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               (exec "echo 'node!'") (exec "echo 'no node'")

     

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         end

     

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       end

     

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       module Dependencies (Task : Task) : sig

     

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         val deps : Task.k list

     

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         val v : Task.v

     

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       end = struct

     

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         module Ks = Make (struct

     

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           type 'a t = Task.k List.t

     

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           let return _ = []

     

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           let apply x y = List.append x y

     

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           let map = `Define_using_apply

     

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           let select x y = List.append x y

     

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         end)

     

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         module Xs : Selective with type 'a t = 'a = struct

     

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           type 'a t = 'a

     

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           let return v = v

     

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           let apply f y = f y

     

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           let map = `Define_using_apply

     

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           let select either f =

     

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             match either with

     

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             | Either.Left v ->

     

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                 Format.printf "Either left\n%!";

     

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                 f v

     

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             | Either.Right b ->

     

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                 Format.printf "Either right\n%!";

     

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                 b

     

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         end

     

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         module Ys = Make (Xs)

     

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         module M = Task.Make (Ks)

     

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         module T = Task.Make (Ys)

     

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         let deps = M.run (fun v -> [ v ])

     

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         let v = T.run Task.exec

     

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       end

     

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       let () =

     

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         let module D = Dependencies (Example) in

     

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         (* List.iter (Format.printf "Dep: %s\n%!") D.deps; *)

     

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         Format.printf "Result: %i\n" D.v