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Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags: Development     Ur/Web    

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Embeds file(s) into the Ur/Web project by creating the module containing

datatype content = File_A | File_B ...
val binary : content -> transaction blob

Additionally, Urembed greatly simplifies writing of the JavaScript FFIs.


You will need Haskell platform and several additional packages. Also, POSIX environment is required (Cygwin should suffice under Windows)

$ git clone https://github.com/grwlf/urembed
$ cd urembed
$ cabal configure
$ cabal build
$ cabal install


$ urembed --help
UrEmebed is the Ur/Web module generator

Usage: urembed [-o|--output FILE.urp] [--version] [FILE]

  Converts a set of FILEs into the Ur/Web modules. Each Module will contain
  following functions:

    val binary : unit -> transaction blob
    val blobpage : unit -> transaction page
    val text : unit -> transaction string

    Additionally, FFI signatures will be provided for JavaScript files. In order
    to enable this, you have to name your JS functions using the name__type
    scheme. See README for details. Also, uru project uses this a lot.

    (NOTE: the interface is not stable. Pleas, fork the Urembed sources
    before using)

  The master project (specified with -o FILE.urp) will contain a dictionary
  version of those functions taking the datatype key as an argument, instead of
  unit. In order to actually compile the binaries, you have to call

    make -f FILE.mk CC=.. LD=.. UR_INCLUDE_DIR=.. urp

  Where FILE.mk is the Makefile, generated by urembed.

    Example: urembed -o static/Static.urp Style.css Script.js
             make -C static -f Static.mk CC=gcc LD=ld UR_INCLUDE_DIR=/usr/local/include/urweb urp

  Note: output directory should exist

Available options:
  -h,--help                Show this help text
  -o,--output FILE.urp     Name of the Ur/Web project being generated
  --version                Show version information
  FILE                     File to embed


To embed Style.css into ypur Ur/Web project:

  1. Run urembed

    $ urembed -o lib/autogen/Static.urp Style.css
    Static.urp.in will be generated as well as Static.mk describing the rules
    to build all the binaries
  2. Run make to build Static.urp

    $ make -C lib/autogen -f Static.mk urp
  3. Include Static.urp into your master .urp file.

    # App.urp
    library lib/autogen/Static
  4. Use the functionality. In this case, lets ship Style.css to the user

    # App.ur
    (* Direct call *)
    fun serve_css {} =
      b <- Static.binary Static.Style_css;
      returnBlob b (blessMime "text/css")
    (* Serve using a blobpage. Uremebed calls blessMime inside *)
    fun style2 {} = Static.blobpage Static.Style_css
    (* Serve directly, not using a dictionary *)
    fun style3 {} = Style_css.blobpage {}

JavaScript FFI helper

Urembed is able to bind top-level JavaScript functions via JavaScript FFI. In order to do it, user has to make sure that FILE has .js extension and contains top-level functions named according to the 'name__type' format. For example:

  • Simple function

     # FILE.js
     function init__unit(menustyle__css_class, text__string) {}

    will be translated into Ur/Web's function

     # FILE.urs
     val init : css_class -> string -> transaction unit
  • Also, it is allowed to drop the name__ part for argument names, so this is also legal

     # FILE.js
     function init__unit(css_class, string) {}

    results in

     # FILE.urs
     val init : css_class -> string -> transaction unit
  • Next, the pure_ prefix in type name will instruct urembed to declare pure function (without 'transaction' part)

     # FILE.js
     function init__pure_string(css_class, string) {}

    results in

     # FILE.urs
     val init : css_class -> string -> string
  • Finally, sometimes users want to declare their own types. Here is how to do it with Urembed:

     # FILE.js
     // Dummy javascript variable, just to set type name
     var type__tmce_imglist;
     function imglist_new__tmce_imglist( unit ) {
       return [];
     function imglist_insert__tmce_imglist(string, url, tmce_imglist) {
       return tmce_imglist.concat([{title:string, value:url}]);
     # FILE.urs
     type tmce_imglist
     val imglist_new : unit -> transaction tmce_imglist
     val imglist_insert : string -> url -> tmce_imglist -> transaction tmce_imglist