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%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ts=4 sw=4 et
%% -------------------------------------------------------------------
%%
%% 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'. It can be a list of name-value tuples or a list of
%% lists of name-value tuples if you have multiple template directories
%% that need to have different settings (see example below).
%%
%% 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
%%
%% recursive: boolean that determines if doc_root(s) need to be
%% scanned recursively for matching template file names
%% (default: true).
%% 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"}
%% ]}.
%%
%% The following example will compile the following templates:
%% "src/*.dtl" files into "ebin/*_dtl.beam" and
%% "templates/*.html" into "ebin/*.beam". Note that any tuple option
%% (such as 'out_dir') in the outer list is added to each inner list:
%% {erlydtl_opts, [
%% {out_dir, "ebin"},
%% {recursive, false},
%% [
%% {doc_root, "src"}, {module_ext, "_dtl"}
%% ],
%% [
%% {doc_root, "templates", {module_ext, ""}, {source_ext, ".html"}
%% ]
%% ]}.
-module(rebar_erlydtl_compiler).
-export([compile/2]).
-include("rebar.hrl").
%% ===================================================================
%% Public API
%% ===================================================================
compile(Config, _AppFile) ->
MultiDtlOpts = erlydtl_opts(Config),
OrigPath = code:get_path(),
true = code:add_path(rebar_utils:ebin_dir()),
Result = lists:foldl(fun(DtlOpts, _) ->
rebar_base_compiler:run(Config, [],
option(doc_root, DtlOpts),
option(source_ext, DtlOpts),
option(out_dir, DtlOpts),
option(module_ext, DtlOpts) ++ ".beam",
fun(S, T, _C) ->
compile_dtl(S, T, DtlOpts)
end,
[{check_last_mod, false},
{recursive, option(recursive, DtlOpts)}])
end, ok, MultiDtlOpts),
true = code:set_path(OrigPath),
Result.
%% ===================================================================
%% Internal functions
%% ===================================================================
erlydtl_opts(Config) ->
Opts = rebar_config:get(Config, erlydtl_opts, []),
Tuples = [{K,V} || {K,V} <- Opts],
case [L || L <- Opts, is_list(L), not io_lib:printable_list(L)] of
[] ->
lists:keysort(1, Tuples);
Lists ->
lists:map(fun(L) ->
lists:keysort(1, lists:foldl(fun({K,T}, Acc) ->
lists:keystore(K, 1, Acc, {K, T})
end, Tuples, L))
end, Lists)
end.
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";
default(custom_tags_dir) -> "";
default(compiler_options) -> [report, return];
default(recursive) -> true.
compile_dtl(Source, Target, DtlOpts) ->
case code:which(erlydtl) of
non_existing ->
?ERROR("~n===============================================~n"
" You need to install erlydtl to compile 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;
_ ->
case needs_compile(Source, Target, DtlOpts) of
true ->
do_compile(Source, Target, DtlOpts);
false ->
skipped
end
end.
do_compile(Source, Target, DtlOpts) ->
%% TODO: Check last mod on target and referenced DTLs here..
%% ensure that doc_root and out_dir are defined,
%% using defaults if necessary
Opts = lists:ukeymerge(1,
DtlOpts,
lists:sort(
[{out_dir, option(out_dir, DtlOpts)},
{doc_root, option(doc_root, DtlOpts)},
{custom_tags_dir, option(custom_tags_dir, DtlOpts)},
{compiler_options, option(compiler_options, DtlOpts)}])),
?INFO("Compiling \"~s\" -> \"~s\" with options:~n ~s~n",
[Source, Target, io_lib:format("~p", [Opts])]),
case erlydtl:compile(Source,
module_name(Target),
Opts) of
ok -> ok;
{error, {File, [{Pos, _Mod, Err}]}} ->
?ERROR("Compiling template ~p failed:~n (~s): ~p~n",
[File, err_location(Pos), Err]);
Reason ->
?ERROR("Compiling template ~s failed:~n ~p~n",
[Source, Reason]),
?FAIL
end.
err_location({L,C}) -> io_lib:format("line:~w, col:~w", [L, C]);
err_location(L) -> io_lib:format("line:~w", [L]).
module_name(Target) ->
F = filename:basename(Target),
string:substr(F, 1, length(F)-length(".beam")).
needs_compile(Source, Target, DtlOpts) ->
LM = filelib:last_modified(Target),
LM < filelib:last_modified(Source) orelse
lists:any(fun(D) -> LM < filelib:last_modified(D) end,
referenced_dtls(Source, DtlOpts)).
referenced_dtls(Source, DtlOpts) ->
DtlOpts1 = lists:keyreplace(doc_root, 1, DtlOpts,
{doc_root, filename:dirname(Source)}),
Set = referenced_dtls1([Source], DtlOpts1,
sets:add_element(Source, sets:new())),
sets:to_list(sets:del_element(Source, Set)).
referenced_dtls1(Step, DtlOpts, Seen) ->
ExtMatch = re:replace(option(source_ext, DtlOpts), "\.", "\\\\\\\\.",
[{return, list}]),
ShOpts = [{use_stdout, false}, return_on_error],
AllRefs =
lists:append(
[begin
Cmd = lists:flatten(["grep -o [^\\\"]*\\",
ExtMatch, "[^\\\"]* ", F]),
case rebar_utils:sh(Cmd, ShOpts) of
{ok, Res} ->
string:tokens(Res, "\n");
{error, _} ->
""
end
end || F <- Step]),
DocRoot = option(doc_root, DtlOpts),
WithPaths = [ filename:join([DocRoot, F]) || F <- AllRefs ],
?DEBUG("All deps: ~p\n", [WithPaths]),
Existing = [F || F <- WithPaths, filelib:is_regular(F)],
New = sets:subtract(sets:from_list(Existing), Seen),
case sets:size(New) of
0 -> Seen;
_ -> referenced_dtls1(sets:to_list(New), DtlOpts,
sets:union(New, Seen))
end.
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