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README.md
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       # Tailwind OCaml

     

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       An OCaml library for generating Tailwind CSS classes with compile-time

     

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       validation and a companion HTML generation library using Htmlit.

     

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       Type-safe Tailwind CSS generation for OCaml with a revolutionary GADT-based interface for succinct, compile-time validated styling.

     

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       This project provides two main libraries:

     

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       - **`tailwind`**: Core library for type-safe Tailwind CSS class generation

     

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       - **`tailwind-html`**: HTML component library built on top of [Htmlit](https://github.com/dbuenzli/htmlit)

     

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       - **`tailwind-html`**: High-level HTML component library with GADT-based heterogeneous list interface built on [Htmlit](https://github.com/dbuenzli/htmlit)

     

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       ## Features

     

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       - Compile-time validation of Tailwind classes

     

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       - Type-safe color variants and sizes

     

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       - Exhaustive pattern matching for all utility classes

     

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       - **GADT-based Interface**: Succinct heterogeneous list syntax with compile-time type safety

     

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       - **Zero Runtime Cost**: All CSS generation happens at compile time

     

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       - **Comprehensive Grid Support**: Full CSS Grid integration with type-safe properties

     

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       - **Type-Safe Colors & Spacing**: Exhaustive variants with compile-time validation

     

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       - **Built-in Components**: Pre-styled buttons, cards, and layout helpers

     

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       ### Comprehensive Coverage

     

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       - **Typography**: Font sizes, weights, line heights, text alignment, decorations

     

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       - **Layout**: Display, position, flexbox, grid, spacing

     

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       - **Colors**: Full color palette with variants

     

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       ### Complete Tailwind Coverage

     

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       - **Typography**: Font sizes, weights, text alignment with type-safe variants

     

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       - **Layout**: CSS Grid, Flexbox, spacing with compile-time validation  

     

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       - **Colors**: Full palette (gray, blue, red, green, etc.) with variant checking

     

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       - **Effects**: Shadows, borders, rounded corners, transitions

     

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       - **Responsive**: Breakpoint-based responsive utilities

     

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       - **Variants**: Hover, focus, and other state variants

     

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       - **Components**: Pre-built buttons, cards, and layout helpers

     

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       - **Type Safety**: GADT-based heterogeneous lists prevent invalid combinations

     

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       ### Using Dune

     

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       ## Quick Start

     

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       Add to your `dune-project`:

     

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       ```dune

     

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       (package

     

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        (name myproject)

     

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        (depends

     

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         ocaml

     

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         dune

     

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         tailwind

     

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         tailwind-html

     

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         htmlit))

     

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       ```

     

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       ## Quick Start

     

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       ### GADT Interface (Recommended)

     

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       ### Basic Usage

     

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       The new GADT-based interface provides succinct, type-safe styling with heterogeneous lists:

     

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       ```ocaml

     

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       open Tailwind

     

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       open Htmlit

     

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       open Tailwind_html

     

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       (* Create a styled div *)

     

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       let styled_div = 

     

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         let classes = tw [

     

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           Display.flex;

     

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           Flexbox.(to_class (justify `Center));

     

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           Flexbox.(to_class (align_items `Center));

     

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           Color.bg (Color.make `Gray ~variant:`V100 ());

     

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           Spacing.(to_class (p (Size.rem 2.0)));

     

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         ] in

     

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         Printf.sprintf "<div class=\"%s\">Content</div>" (to_string classes)

     

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       (* Create a centered card with CSS Grid *)

     

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       let create_hero_section () =

     

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         div ~styles:[

     

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           grid;

     

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           grid_cols 1;

     

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           gap (rem 2.0);

     

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           padding (rem 3.0);

     

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           text_center;

     

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         ] [

     

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           h1 ~styles:[

     

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             font_size `Xl3;

     

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             font_weight `Bold;

     

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             text_color (blue 600);

     

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             margin_bottom (rem 1.5);

     

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           ] [txt "Welcome to Tailwind OCaml"];

     

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           p ~styles:[

     

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             font_size `Lg;

     

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             text_color (gray 600);

     

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             margin_bottom (rem 2.0);

     

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           ] [txt "Type-safe CSS with compile-time guarantees"];

     

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           (* Built-in button components *)

     

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           btn_primary ~size:`Lg [txt "Get Started"];

     

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         ]

     

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       ```

     

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       ### With Htmlit Integration

     

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       ### CSS Grid Layouts

     

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       ```ocaml

     

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       open Htmlit

     

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       open Tailwind

     

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       (* Three-column responsive grid *)

     

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       div ~styles:[

     

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         grid;

     

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         grid_cols 3;

     

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         gap (rem 1.5);

     

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       ] [

     

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         card [h3 [txt "Feature 1"]; p [txt "Description"]];

     

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         card [h3 [txt "Feature 2"]; p [txt "Description"]];

     

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         card [h3 [txt "Feature 3"]; p [txt "Description"]];

     

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       ]

     

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       ```

     

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       let classes_attr tailwind_classes = 

     

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         At.class' (Tailwind.to_string tailwind_classes)

     

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       ### Built-in Components

     

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       let create_card title content =

     

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         El.div ~at:[classes_attr (tw [

     

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           Patterns.card;

     

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           Spacing.(to_class (p (Size.rem 1.5)));

     

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           Effects.shadow_md;

     

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         ])] [

     

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           El.h2 ~at:[classes_attr (tw [

     

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             Typography.(to_class (font_size `Xl));

     

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             Typography.(to_class (font_weight `Bold));

     

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             Spacing.(to_class (mb (Size.rem 1.0)));

     

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           ])] [El.txt title];

     

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           El.p [El.txt content];

     

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         ]

     

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       ```ocaml

     

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       (* Pre-styled components with size variants *)

     

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       btn_primary ~size:`Lg [txt "Primary Action"];

     

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       btn_secondary [txt "Secondary Action"];

     

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       btn_outline ~size:`Sm [txt "Outline Button"];

     

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       (* Layout helpers *)

     

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       container [

     

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         card [

     

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           h2 ~styles:[font_size `Xl; margin_bottom (rem 1.0)] [txt "Card Title"];

     

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           p ~styles:[text_color (gray 600)] [txt "Card content with automatic styling"];

     

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         ];

     

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       ]

     

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       ```

     

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       ## Examples

     

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       The `examples/` directory contains several demonstration files:

     

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       The `examples/` directory showcases the GADT interface across various use cases:

     

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       ### Running Examples

     

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       ### Available Examples

     

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       ```bash

     

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       # Build all examples

     

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       dune build examples/

     

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       # Run comprehensive showcase (generates HTML + CSS)

     

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       dune exec examples/comprehensive_showcase.exe

     

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       # Hello World with GADT interface

     

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       dune exec examples/hello_tailwind_01.exe > hello.html

     

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       # Colors and Typography showcase

     

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       dune exec examples/colors_and_typography_02.exe > colors.html

     

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       # CSS Grid and Layout demonstrations

     

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       dune exec examples/layout_and_spacing_03.exe > layout.html

     

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       # Run basic usage example

     

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       dune exec examples/basic_usage.exe

     

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       # Responsive design patterns  

     

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       dune exec examples/responsive_design_04.exe > responsive.html

     

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       # Run HTML integration example  

     

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       dune exec examples/tailwind_html_example.exe

     

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       # Visual effects and styling

     

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       dune exec examples/effects_and_variants_05.exe > effects.html

     

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       # Component patterns and reusable elements

     

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       dune exec examples/patterns_and_components_06.exe > patterns.html

     

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       # Complete application showcase

     

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       dune exec examples/comprehensive_showcase_07.exe > showcase.html

     

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       # Button component demonstration

     

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       dune exec examples/button_demo.exe > buttons.html

     

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       # Generate index page linking all examples

     

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       dune exec examples/index_html_generator.exe > index.html

     

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       ```

     

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       ### Comprehensive Showcase

     

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       ### Example Highlights

     

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       **CSS Grid Layout (`layout_and_spacing_03.ml`)**:

     

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       ```ocaml

     

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       (* Three-column grid with gap variations *)

     

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       div ~styles:[

     

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         grid;

     

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         grid_cols 3;

     

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         gap (rem 1.0);

     

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       ] [

     

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         div ~styles:[bg_color (blue 100); padding (rem 1.0)] [txt "Item 1"];

     

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         div ~styles:[bg_color (green 100); padding (rem 1.0)] [txt "Item 2"];

     

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         div ~styles:[bg_color (purple 100); padding (rem 1.0)] [txt "Item 3"];

     

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       ]

     

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       The comprehensive showcase demonstrates all library features and generates:

     

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       - `showcase.html` - Complete HTML page with all Tailwind classes

     

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       - `input.css` - Tailwind v4 CSS with custom theme extensions

     

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       (* Asymmetric grid gaps *)

     

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       div ~styles:[

     

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         grid;

     

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         grid_cols 2;

     

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         gap_x (rem 2.0);

     

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         gap_y (rem 0.5);

     

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       ] (List.init 4 (fun i ->

     

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         div ~styles:[bg_color (purple 200); text_center] [

     

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           txt (Printf.sprintf "Box %d" (i + 1))

     

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         ]

     

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       ))

     

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       ```

     

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       ```bash

     

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       dune exec examples/comprehensive_showcase.exe

     

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       # Then open showcase.html in your browser

     

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       **Built-in Components (`button_demo.ml`)**:

     

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       ```ocaml

     

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       (* Size variants with consistent styling *)

     

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       div ~styles:[flex; flex_col; gap (rem 1.0)] [

     

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         btn_primary ~size:`Sm [txt "Small Primary"];

     

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         btn_primary [txt "Default Primary"];

     

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         btn_primary ~size:`Lg [txt "Large Primary"];

     

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         btn_secondary [txt "Secondary Button"];

     

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         btn_outline [txt "Outline Button"];

     

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       ]

     

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       ```

     

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       **Responsive Cards (`comprehensive_showcase_07.ml`)**:

     

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       ```ocaml

     

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       section ~styles:[margin_bottom (rem 4.0)] [

     

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         h3 ~styles:[font_size `Xl2; text_center; margin_bottom (rem 3.0)] [

     

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           txt "Features"

     

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         ];

     

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         div ~styles:[grid; grid_cols 1; gap (rem 2.0)] [

     

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           card [

     

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             h4 ~styles:[font_size `Xl; font_weight `Semibold; text_color (blue 600)] [

     

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               txt "🎯 Type Safety"

     

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             ];

     

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             p ~styles:[text_color (gray 600)] [

     

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               txt "Catch styling errors at compile time with GADT-based type checking."

     

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             ];

     

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           ];

     

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           card [

     

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             h4 ~styles:[font_size `Xl; font_weight `Semibold; text_color (green 600)] [

     

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               txt "⚡ Performance" 

     

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             ];

     

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             p ~styles:[text_color (gray 600)] [

     

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               txt "Zero runtime overhead with compile-time CSS generation."

     

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             ];

     

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           ];

     

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         ];

     

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       ]

     

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       ```

     

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       ## Tailwind v4 Support

     
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       npx tailwindcss@next -i input.css -o output.css

     

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       ```

     

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       ## Module Documentation

     

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       ## API Reference

     

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       ### Core Modules

     

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       ### `Tailwind_html` (GADT Interface)

     

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       #### `Tailwind`

     

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       Main module that exports all utilities and provides the `tw` function for composing classes.

     

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       The high-level GADT interface provides succinct, type-safe styling with heterogeneous lists:

     

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       #### `Color`

     

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       Type-safe color system with variants:

     

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       #### Layout Properties

     

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       ```ocaml

     

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       Color.bg (Color.make `Blue ~variant:`V600 ())

     

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       Color.text Color.white

     

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       Color.border (Color.make `Gray ~variant:`V200 ())

     

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       ~styles:[

     

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         (* Display *)

     

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         grid | flex | block | inline | hidden;

     

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         (* Grid System *)

     

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         grid_cols 3 | grid_rows 2;

     

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         gap (rem 1.0) | gap_x (rem 1.5) | gap_y (rem 0.5);

     

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         (* Flexbox *)

     

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         flex_col | flex_row;

     

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         justify_center | justify_between | justify_end;

     

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         items_center | items_start | items_end;

     

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         (* Sizing *)

     

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         width full | height screen;

     

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         min_height screen | max_width (rem 64.0);

     

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       ]

     

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       ```

     

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       #### `Typography`

     

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       Font utilities:

     

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       #### Typography Properties

     

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       ```ocaml

     

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       Typography.(to_class (font_size `Xl2))

     

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       Typography.(to_class (font_weight `Bold))

     

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       Typography.(to_class (line_height `Relaxed))

     

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       ~styles:[

     

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         (* Font Sizes *)

     

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         font_size `Xs | font_size `Sm | font_size `Base | font_size `Lg;

     

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         font_size `Xl | font_size `Xl2 | font_size `Xl3;

     

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         (* Font Weights *)

     

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         font_weight `Light | font_weight `Normal | font_weight `Medium;

     

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         font_weight `Semibold | font_weight `Bold;

     

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         (* Text Styling *)

     

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         text_center | text_left | text_right;

     

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         text_color (blue 600) | text_color (gray 500);

     

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       ]

     

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       ```

     

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       #### `Spacing`

     

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       -
       Margin and padding utilities:

     

       265
       265
       +
       #### Color System

     

       159
       266
        
       ```ocaml

     

       160
       160
       -
       Spacing.(to_class (p (Size.rem 1.0)))    (* padding *)

     

       161
       161
       -
       Spacing.(to_class (mx Size.auto))        (* margin-x auto *)

     

       162
       162
       -
       Spacing.(to_class (gap `All (Size.px 16.0))) (* gap *)

     

       267
       267
       +
       ~styles:[

     

       268
       268
       +
         (* Background Colors *)

     

       269
       269
       +
         bg_color (blue 50) | bg_color (gray 100) | bg_color (red 500);

     

       270
       270
       +
         bg_color (Tailwind.Color.white) | bg_color (green 600);

     

       271
       271
       +
         

     

       272
       272
       +
         (* Text Colors *)

     

       273
       273
       +
         text_color (gray 800) | text_color (blue 600) | text_color (red 500);

     

       274
       274
       +
         

     

       275
       275
       +
         (* Border Colors *)

     

       276
       276
       +
         border_color (gray 200) | border_color (blue 300);

     

       277
       277
       +
       ]

     

       163
       278
        
       ```

     

       164
       279
        
       

     

       165
       165
       -
       #### `Layout`

     

       166
       166
       -
       Layout utilities:

     

       280
       280
       +
       #### Spacing Properties

     

       167
       281
        
       ```ocaml

     

       168
       168
       -
       Layout.(to_class (width (Size.percent 100.0)))

     

       169
       169
       -
       Layout.(to_class (height Size.screen))

     

       170
       170
       -
       Layout.(to_class (max_width (Size.rem 64.0)))

     

       282
       282
       +
       ~styles:[

     

       283
       283
       +
         (* Padding *)

     

       284
       284
       +
         padding (rem 1.0) | padding_x (rem 1.5) | padding_y (rem 2.0);

     

       285
       285
       +
         

     

       286
       286
       +
         (* Margin *)

     

       287
       287
       +
         margin (rem 1.0) | margin_x auto | margin_bottom (rem 2.0);

     

       288
       288
       +
         margin_top (rem 1.5) | margin_left (rem 0.5);

     

       289
       289
       +
       ]

     

       171
       290
        
       ```

     

       172
       291
        
       

     

       173
       173
       -
       #### `Flexbox`

     

       174
       174
       -
       Flexbox utilities:

     

       292
       292
       +
       #### Visual Effects

     

       175
       293
        
       ```ocaml

     

       176
       176
       -
       Display.flex

     

       177
       177
       -
       Flexbox.(to_class (justify `Between))

     

       178
       178
       -
       Flexbox.(to_class (align_items `Center))

     

       179
       179
       -
       Flexbox.(to_class (direction `Col))

     

       294
       294
       +
       ~styles:[

     

       295
       295
       +
         (* Shadows *)

     

       296
       296
       +
         shadow `Sm | shadow `Md | shadow `Lg | shadow `Xl;

     

       297
       297
       +
         

     

       298
       298
       +
         (* Borders *)

     

       299
       299
       +
         border | rounded `Sm | rounded `Md | rounded `Lg | rounded `Full;

     

       300
       300
       +
         

     

       301
       301
       +
         (* Transitions *)

     

       302
       302
       +
         transition;

     

       303
       303
       +
       ]

     

       180
       304
        
       ```

     

       181
       305
        
       

     

       182
       182
       -
       #### `Grid`

     

       183
       183
       -
       CSS Grid utilities:

     

       306
       306
       +
       #### Built-in Components

     

       184
       307
        
       ```ocaml

     

       185
       185
       -
       Display.grid

     

       186
       186
       -
       Grid.(to_class (template_cols (`Cols 3)))

     

       187
       187
       -
       Grid.(to_class (gap (Size.rem 1.0)))

     

       188
       188
       -
       ```

     

       308
       308
       +
       (* Button Components *)

     

       309
       309
       +
       btn_primary ~size:`Lg [txt "Primary Button"];

     

       310
       310
       +
       btn_secondary ~size:`Sm [txt "Secondary Button"];  

     

       311
       311
       +
       btn_outline [txt "Outline Button"];

     

       312
       312
       +
       

     

       313
       313
       +
       (* Layout Components *)

     

       314
       314
       +
       container [content];     (* Max-width container with auto margins *)

     

       315
       315
       +
       card [content];         (* Pre-styled card with padding and shadow *)

     

       189
       316
        
       

     

       190
       190
       -
       #### `Effects`

     

       191
       191
       -
       Visual effects:

     

       192
       192
       -
       ```ocaml

     

       193
       193
       -
       Effects.shadow_lg

     

       194
       194
       -
       Effects.rounded_md

     

       195
       195
       -
       Effects.border

     

       196
       196
       -
       Effects.transition `All

     

       317
       317
       +
       (* HTML Elements with Styling *)

     

       318
       318
       +
       h1 ~styles:[font_size `Xl3; font_weight `Bold] [txt "Heading"];

     

       319
       319
       +
       p ~styles:[text_color (gray 600); margin_bottom (rem 1.0)] [txt "Paragraph"];

     

       320
       320
       +
       div ~styles:[grid; grid_cols 2; gap (rem 1.0)] [content];

     

       321
       321
       +
       section ~styles:[margin_bottom (rem 2.0)] [content];

     

       197
       322
        
       ```

     

       198
       323
        
       

     

       199
       199
       -
       #### `Responsive`

     

       200
       200
       -
       Responsive utilities:

     

       201
       201
       -
       ```ocaml

     

       202
       202
       -
       Responsive.(to_class (at_breakpoint `Md Display.flex))

     

       203
       203
       -
       Responsive.(to_class (at_breakpoint `Lg (Grid.(to_class (template_cols (`Cols 4))))))

     

       204
       204
       -
       ```

     

       324
       324
       +
       ### Low-Level `Tailwind` Module

     

       205
       325
        
       

     

       206
       206
       -
       #### `Variants`

     

       207
       207
       -
       State variants:

     

       208
       208
       -
       ```ocaml

     

       209
       209
       -
       Variants.hover (Color.bg (Color.make `Blue ~variant:`V700 ()))

     

       210
       210
       -
       Variants.focus Effects.ring

     

       211
       211
       -
       ```

     

       326
       326
       +
       For advanced use cases, the core `Tailwind` module provides detailed control:

     

       212
       327
        
       

     

       213
       213
       -
       #### `Patterns`

     

       214
       214
       -
       Common layout patterns:

     

       215
       328
        
       ```ocaml

     

       216
       216
       -
       Patterns.container ()

     

       217
       217
       -
       Patterns.card

     

       218
       218
       -
       Patterns.flex_center

     

       219
       219
       -
       Patterns.stack ~gap:(Size.rem 1.0) ()

     

       220
       220
       -
       Patterns.sticky_header

     

       329
       329
       +
       open Tailwind

     

       330
       330
       +
       

     

       331
       331
       +
       let classes = Css.tw [

     

       332
       332
       +
         Display.grid;

     

       333
       333
       +
         Grid.(to_class (template_cols (`Cols 3)));

     

       334
       334
       +
         Spacing.(to_class (gap `All (Size.rem 1.0)));

     

       335
       335
       +
         Color.bg (Color.make `Blue ~variant:`V50 ());

     

       336
       336
       +
       ]

     

       337
       337
       +
       

     

       338
       338
       +
       let html_class = to_string classes  (* "grid grid-cols-3 gap-4 bg-blue-50" *)

     

       221
       339
        
       ```

     

       222
       340
        
       

     

       223
       223
       -
       ### HTML Components (`tailwind-html`)

     

       341
       341
       +
       ### Getting Started

     

       224
       342
        
       

     

       225
       225
       -
       Pre-built components using Htmlit:

     

       343
       343
       +
       Add to your `dune-project`:

     

       344
       344
       +
       ```dune

     

       345
       345
       +
       (package

     

       346
       346
       +
        (name myproject)

     

       347
       347
       +
        (depends

     

       348
       348
       +
         ocaml

     

       349
       349
       +
         dune

     

       350
       350
       +
         tailwind

     

       351
       351
       +
         tailwind-html

     

       352
       352
       +
         htmlit))

     

       353
       353
       +
       ```

     

       226
       354
        
       

     

       355
       355
       +
       Then in your OCaml code:

     

       227
       356
        
       ```ocaml

     

       357
       357
       +
       open Htmlit

     

       228
       358
        
       open Tailwind_html

     

       229
       359
        
       

     

       230
       230
       -
       (* Button component *)

     

       231
       231
       -
       Button.primary ~text:"Click me" ~onclick:"handleClick()"

     

       232
       232
       -
       

     

       233
       233
       -
       (* Card component *)

     

       234
       234
       -
       Card.simple ~title:"Card Title" ~content:"Card content here"

     

       235
       235
       -
       

     

       236
       236
       -
       (* Layout components *)

     

       237
       237
       -
       Layout.container [

     

       238
       238
       -
         Layout.row [

     

       239
       239
       -
           Layout.col ~span:6 [content];

     

       240
       240
       -
           Layout.col ~span:6 [content];

     

       241
       241
       -
         ]

     

       360
       360
       +
       let my_page = El.html [

     

       361
       361
       +
         El.head [El.title [txt "My App"]];

     

       362
       362
       +
         El.body ~at:[classes_attr [min_height screen; bg_color (gray 50)]] [

     

       363
       363
       +
           container [

     

       364
       364
       +
             h1 ~styles:[font_size `Xl3; text_center; margin_bottom (rem 2.0)] [

     

       365
       365
       +
               txt "Welcome to Type-Safe CSS!"

     

       366
       366
       +
             ];

     

       367
       367
       +
             btn_primary [txt "Get Started"];

     

       368
       368
       +
           ];

     

       369
       369
       +
         ];

     

       242
       370
        
       ]

     

       243
       371
        
       ```

     

       244
       372