rebar can now compile ErlyDTL files (if erlydtl is installed)

defaults to compiling from templates/*.dtl to ebin/*_dtl.beam
see top of rebar_erlydtl_compiler for configuration options

ebin/rebar.app

@@ -11,6 +11,7 @@
               rebar_eunit,
               rebar_file_utils,
               rebar_lfe_compiler,
+              rebar_erlydtl_compiler,
               rebar_log,
               rebar_otp_app,
               rebar_port_compiler,
@@ -32,6 +33,7 @@
                     {app_dir, [ rebar_protobuffs_compiler,
                                 rebar_erlc_compiler,
                                 rebar_lfe_compiler,
+                                rebar_erlydtl_compiler,
                                 rebar_port_compiler,
                                 rebar_otp_app,
                                 rebar_ct,

src/rebar_erlydtl_compiler.erl

@@ -0,0 +1,167 @@
+%% -------------------------------------------------------------------
+%%
+%% rebar: Erlang Build Tools
+%%
+%% Copyright (c) 2009 Dave Smith (dizzyd@dizzyd.com),
+%%                    Bryan Fink (bryan@basho.com)
+%%
+%% Permission is hereby granted, free of charge, to any person obtaining a copy
+%% of this software and associated documentation files (the "Software"), to deal
+%% in the Software without restriction, including without limitation the rights
+%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+%% copies of the Software, and to permit persons to whom the Software is
+%% furnished to do so, subject to the following conditions:
+%%
+%% The above copyright notice and this permission notice shall be included in
+%% all copies or substantial portions of the Software.
+%%
+%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+%% THE SOFTWARE.
+%% -------------------------------------------------------------------
+
+%% The rebar_erlydtl_compiler module is a plugin for rebar that compiles
+%% ErlyDTL templates.  By default, it compiles all templates/*.dtl
+%% to ebin/*_dtl.beam.
+%%
+%% Configuration options should be placed in rebar.config under
+%% 'erlydtl_opts'.  Available options include:
+%%
+%%  doc_root: where to find templates to compile
+%%            "templates" by default
+%%
+%%  out_dir: where to put compiled template beam files
+%%           "ebin" by default
+%%
+%%  source_ext: the file extension the template sources have
+%%              ".dtl" by default
+%%
+%%  module_ext: characters to append to the template's module name
+%%              "_dtl" by default
+%%
+%% For example, if you had:
+%%   /t_src/
+%%          base.html
+%%          foo.html
+%%
+%% And you wanted them compiled to:
+%%   /priv/
+%%         base.beam
+%%         foo.beam
+%%
+%% You would add to your rebar.config:
+%%   {erlydtl_opts, [
+%%               {doc_root,   "t_src"},
+%%               {out_dir,    "priv"},
+%%               {source_ext, ".html"},
+%%               {module_ext, ""}
+%%              ]}.
+%%
+%% The default settings are the equivalent of:
+%%   {erlydtl_opts, [
+%%               {doc_root,   "templates"},
+%%               {out_dir,    "ebin"},
+%%               {source_ext, ".dtl"},
+%%               {module_ext, "_dtl"}
+%%              ]}.
+-module(rebar_erlydtl_compiler).
+
+-export([compile/2]).
+
+-include("rebar.hrl").
+
+%% ===================================================================
+%% Public API
+%% ===================================================================
+
+compile(Config, _AppFile) ->
+    DtlOpts = erlydtl_opts(Config),
+    rebar_erlc_compiler:do_compile(
+      Config,
+      filename:join([option(doc_root, DtlOpts),
+                     ["*",option(source_ext, DtlOpts)]]),
+      option(out_dir, DtlOpts),
+      option(source_ext, DtlOpts),
+      option(module_ext, DtlOpts)++".beam",
+      fun referenced_dtls/2, fun compile_dtl/2, []).
+
+
+%% ===================================================================
+%% Internal functions
+%% ===================================================================
+
+erlydtl_opts(Config) ->
+    rebar_config:get(Config, erlydtl_opts, []).
+
+option(Opt, DtlOpts) ->
+    proplists:get_value(Opt, DtlOpts, default(Opt)).
+
+default(doc_root) -> "templates";
+default(out_dir)  -> "ebin";
+default(source_ext) -> ".dtl";
+default(module_ext) -> "_dtl".
+
+referenced_dtls(Source, Config) ->
+    Set = referenced_dtls([Source], Config,
+                          sets:add_element(Source, sets:new())),
+    Final = sets:to_list(sets:del_element(Source, Set)),
+    Final.
+
+referenced_dtls(Step, Config, Seen) ->
+    DtlOpts = erlydtl_opts(Config),
+    ExtMatch = re:replace(option(source_ext, DtlOpts), "\.", "\\\\.",
+                          [{return, list}]),
+    AllRefs = lists:append(
+                [ string:tokens(
+                    os:cmd(["grep -o [^\\\"]*",ExtMatch," ",F]),
+                    "\n")
+                  || F <- Step]),
+    DocRoot = option(doc_root, DtlOpts),
+    WithPaths = [ filename:join([DocRoot, F]) || F <- AllRefs ],
+    Existing = lists:filter(fun filelib:is_file/1, WithPaths),
+    New = sets:subtract(sets:from_list(Existing), Seen),
+    case sets:size(New) of
+        0 -> Seen;
+        _ -> referenced_dtls(sets:to_list(New), Config,
+                             sets:union(New, Seen))
+    end.
+
+compile_dtl(Source, Config) ->
+    case code:which(erlydtl) of
+        non_existing ->
+            ?CONSOLE(
+               "~n===============================================~n"
+               " You need to install erlydtl to comple DTL templates~n"
+               " Download the latest tarball release from github~n"
+               "    http://code.google.com/p/erlydtl/~n"
+               " and install it into your erlang library dir~n"
+               "===============================================~n~n", []),
+            ?FAIL;
+        _ ->
+            DtlOpts = erlydtl_opts(Config),
+            %% ensure that doc_root and out_dir are defined,
+            %% using defaults if necessary
+            Opts = [{out_dir, option(out_dir, DtlOpts)},
+                    {doc_root, option(doc_root, DtlOpts)},
+                    report, return],
+            case erlydtl:compile(Source,
+                                 module_name(Source,DtlOpts),
+                                 Opts++DtlOpts) of
+                ok -> ok;
+                Reason ->
+                    ?CONSOLE("Compiling template ~s failed:~n  ~p~n",
+                             [Source, Reason]),
+                    ?FAIL
+            end
+    end.
+
+module_name(DtlPath, DtlOpts) ->
+    F = filename:basename(DtlPath),
+    SourceExt = option(source_ext, DtlOpts),
+    ModuleExt = option(module_ext, DtlOpts),
+    list_to_atom(lists:sublist(F, length(F)-length(SourceExt))
+                 ++ModuleExt).