add back templating

5 files changed, 326 insertions, 61 deletions

diff --git a/ebin/rebar.app b/ebin/rebar.app
index 47770cc..6d48a1b 100644
--- a/ebin/rebar.app
+++ b/ebin/rebar.app
@@ -30,7 +30,9 @@
               rebar_prv_app_discovery,
               rebar_require_vsn,
               rebar_prv_release,
+              rebar_prv_new,
               rebar_prv_update,
+              rebar_mustache,
               rebar_shell,
               rebar_state,
               rebar_prv_tar,
@@ -62,6 +64,7 @@
                      rebar_shell,
                      rebar_ct,
                      rebar_prv_tar,
+                     rebar_prv_new,
                      rebar_prv_update,
                      rebar_prv_release]}
         ]}
diff --git a/src/rebar_mustache.erl b/src/rebar_mustache.erl
new file mode 100644
index 0000000..9016c0f
--- /dev/null
+++ b/src/rebar_mustache.erl
@@ -0,0 +1,230 @@
+%% The MIT License
+%%
+%% Copyright (c) 2009 Tom Preston-Werner <tom@mojombo.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.
+
+%% See the README at http://github.com/mojombo/mustache.erl for additional
+%% documentation and usage examples.
+
+-module(rebar_mustache).  %% v0.1.0
+-author("Tom Preston-Werner").
+-export([compile/1, compile/2, render/1, render/2, render/3, get/2, get/3, escape/1, start/1]).
+
+-record(mstate, {mod = undefined,
+                 section_re = undefined,
+                 tag_re = undefined}).
+
+-define(MUSTACHE_STR, "rebar_mustache").
+
+compile(Body) when is_list(Body) ->
+  State = #mstate{},
+  CompiledTemplate = pre_compile(Body, State),
+  % io:format("~p~n~n", [CompiledTemplate]),
+  % io:format(CompiledTemplate ++ "~n", []),
+  {ok, Tokens, _} = erl_scan:string(CompiledTemplate),
+  {ok, [Form]} = erl_parse:parse_exprs(Tokens),
+  Bindings = erl_eval:new_bindings(),
+  {value, Fun, _} = erl_eval:expr(Form, Bindings),
+  Fun;
+compile(Mod) ->
+  TemplatePath = template_path(Mod),
+  compile(Mod, TemplatePath).
+
+compile(Mod, File) ->
+  code:purge(Mod),
+  {module, _} = code:load_file(Mod),
+  {ok, TemplateBin} = file:read_file(File),
+  Template = re:replace(TemplateBin, "\"", "\\\\\"", [global, {return,list}]),
+  State = #mstate{mod = Mod},
+  CompiledTemplate = pre_compile(Template, State),
+  % io:format("~p~n~n", [CompiledTemplate]),
+  % io:format(CompiledTemplate ++ "~n", []),
+  {ok, Tokens, _} = erl_scan:string(CompiledTemplate),
+  {ok, [Form]} = erl_parse:parse_exprs(Tokens),
+  Bindings = erl_eval:new_bindings(),
+  {value, Fun, _} = erl_eval:expr(Form, Bindings),
+  Fun.
+
+render(Mod) ->
+  TemplatePath = template_path(Mod),
+  render(Mod, TemplatePath).
+
+render(Body, Ctx) when is_list(Body) ->
+  TFun = compile(Body),
+  render(undefined, TFun, Ctx);
+render(Mod, File) when is_list(File) ->
+  render(Mod, File, dict:new());
+render(Mod, CompiledTemplate) ->
+  render(Mod, CompiledTemplate, dict:new()).
+
+render(Mod, File, Ctx) when is_list(File) ->
+  CompiledTemplate = compile(Mod, File),
+  render(Mod, CompiledTemplate, Ctx);
+render(Mod, CompiledTemplate, Ctx) ->
+  Ctx2 = dict:store('__mod__', Mod, Ctx),
+  lists:flatten(CompiledTemplate(Ctx2)).
+
+pre_compile(T, State) ->
+  SectionRE = "\{\{\#([^\}]*)}}\s*(.+?){{\/\\1\}\}\s*",
+  {ok, CompiledSectionRE} = re:compile(SectionRE, [dotall]),
+  TagRE = "\{\{(#|=|!|<|>|\{)?(.+?)\\1?\}\}+",
+  {ok, CompiledTagRE} = re:compile(TagRE, [dotall]),
+  State2 = State#mstate{section_re = CompiledSectionRE, tag_re = CompiledTagRE},
+  "fun(Ctx) -> " ++
+    "CFun = fun(A, B) -> A end, " ++
+    compiler(T, State2) ++ " end.".
+
+compiler(T, State) ->
+  Res = re:run(T, State#mstate.section_re),
+  case Res of
+    {match, [{M0, M1}, {N0, N1}, {C0, C1}]} ->
+      Front = string:substr(T, 1, M0),
+      Back = string:substr(T, M0 + M1 + 1),
+      Name = string:substr(T, N0 + 1, N1),
+      Content = string:substr(T, C0 + 1, C1),
+      "[" ++ compile_tags(Front, State) ++
+        " | [" ++ compile_section(Name, Content, State) ++
+        " | [" ++ compiler(Back, State) ++ "]]]";
+    nomatch ->
+      compile_tags(T, State)
+  end.
+
+compile_section(Name, Content, State) ->
+  Mod = State#mstate.mod,
+  Result = compiler(Content, State),
+  "fun() -> " ++
+    "case " ++ ?MUSTACHE_STR ++ ":get(" ++ Name ++ ", Ctx, " ++ atom_to_list(Mod) ++ ") of " ++
+      "\"true\" -> " ++
+        Result ++ "; " ++
+      "\"false\" -> " ++
+        "[]; " ++
+      "List when is_list(List) -> " ++
+        "[fun(Ctx) -> " ++ Result ++ " end(dict:merge(CFun, SubCtx, Ctx)) || SubCtx <- List]; " ++
+      "Else -> " ++
+        "throw({template, io_lib:format(\"Bad context for ~p: ~p\", [" ++ Name ++ ", Else])}) " ++
+    "end " ++
+  "end()".
+
+compile_tags(T, State) ->
+  Res = re:run(T, State#mstate.tag_re),
+  case Res of
+    {match, [{M0, M1}, K, {C0, C1}]} ->
+      Front = string:substr(T, 1, M0),
+      Back = string:substr(T, M0 + M1 + 1),
+      Content = string:substr(T, C0 + 1, C1),
+      Kind = tag_kind(T, K),
+      Result = compile_tag(Kind, Content, State),
+      "[\"" ++ Front ++
+        "\" | [" ++ Result ++
+        " | " ++ compile_tags(Back, State) ++ "]]";
+    nomatch ->
+      "[\"" ++ T ++ "\"]"
+  end.
+
+tag_kind(_T, {-1, 0}) ->
+  none;
+tag_kind(T, {K0, K1}) ->
+  string:substr(T, K0 + 1, K1).
+
+compile_tag(none, Content, State) ->
+  Mod = State#mstate.mod,
+  ?MUSTACHE_STR ++ ":escape(" ++ ?MUSTACHE_STR ++ ":get(" ++ Content ++ ", Ctx, " ++ atom_to_list(Mod) ++ "))";
+compile_tag("{", Content, State) ->
+  Mod = State#mstate.mod,
+  ?MUSTACHE_STR ++ ":get(" ++ Content ++ ", Ctx, " ++ atom_to_list(Mod) ++ ")";
+compile_tag("!", _Content, _State) ->
+  "[]".
+
+template_dir(Mod) ->
+  DefaultDirPath = filename:dirname(code:which(Mod)),
+  case application:get_env(mustache, templates_dir) of
+    {ok, DirPath} when is_list(DirPath) ->
+      case filelib:ensure_dir(DirPath) of
+        ok -> DirPath;
+        _  -> DefaultDirPath
+      end;
+    _ ->
+      DefaultDirPath
+  end.
+template_path(Mod) ->
+  DirPath = template_dir(Mod),
+  Basename = atom_to_list(Mod),
+  filename:join(DirPath, Basename ++ ".mustache").
+
+get(Key, Ctx) when is_list(Key) ->
+  {ok, Mod} = dict:find('__mod__', Ctx),
+  get(list_to_atom(Key), Ctx, Mod);
+get(Key, Ctx) ->
+  {ok, Mod} = dict:find('__mod__', Ctx),
+  get(Key, Ctx, Mod).
+
+get(Key, Ctx, Mod) when is_list(Key) ->
+  get(list_to_atom(Key), Ctx, Mod);
+get(Key, Ctx, Mod) ->
+  case dict:find(Key, Ctx) of
+    {ok, Val} ->
+      % io:format("From Ctx {~p, ~p}~n", [Key, Val]),
+      to_s(Val);
+    error ->
+      case erlang:function_exported(Mod, Key, 1) of
+        true ->
+          Val = to_s(Mod:Key(Ctx)),
+          % io:format("From Mod/1 {~p, ~p}~n", [Key, Val]),
+          Val;
+        false ->
+          case erlang:function_exported(Mod, Key, 0) of
+            true ->
+              Val = to_s(Mod:Key()),
+              % io:format("From Mod/0 {~p, ~p}~n", [Key, Val]),
+              Val;
+            false ->
+              []
+          end
+      end
+  end.
+
+to_s(Val) when is_integer(Val) ->
+  integer_to_list(Val);
+to_s(Val) when is_float(Val) ->
+  io_lib:format("~.2f", [Val]);
+to_s(Val) when is_atom(Val) ->
+  atom_to_list(Val);
+to_s(Val) ->
+  Val.
+
+escape(HTML) ->
+  escape(HTML, []).
+
+escape([], Acc) ->
+  lists:reverse(Acc);
+escape(["<" | Rest], Acc) ->
+  escape(Rest, lists:reverse("&lt;", Acc));
+escape([">" | Rest], Acc) ->
+  escape(Rest, lists:reverse("&gt;", Acc));
+escape(["&" | Rest], Acc) ->
+  escape(Rest, lists:reverse("&amp;", Acc));
+escape([X | Rest], Acc) ->
+  escape(Rest, [X | Acc]).
+
+%%---------------------------------------------------------------------------
+
+start([T]) ->
+  Out = render(list_to_atom(T)),
+  io:format(Out ++ "~n", []).
diff --git a/src/rebar_prv_new.erl b/src/rebar_prv_new.erl
new file mode 100644
index 0000000..e5233cd
--- /dev/null
+++ b/src/rebar_prv_new.erl
@@ -0,0 +1,69 @@
+-module(rebar_prv_new).
+
+-behaviour(rebar_provider).
+
+-export([init/1,
+         do/1]).
+
+-include("rebar.hrl").
+
+-define(PROVIDER, new).
+-define(DEPS, []).
+
+%% ===================================================================
+%% Public API
+%% ===================================================================
+
+-spec init(rebar_state:t()) -> {ok, rebar_state:t()}.
+init(State) ->
+    State1 = rebar_state:add_provider(State, #provider{name = ?PROVIDER,
+                                                       provider_impl = ?MODULE,
+                                                       bare = false,
+                                                       deps = ?DEPS,
+                                                       example = "rebar new <template>",
+                                                       short_desc = "",
+                                                       desc = info(create),
+                                                       opts = []}),
+    {ok, State1}.
+
+-spec do(rebar_state:t()) -> {ok, rebar_state:t()}.
+do(State) ->
+    case rebar_state:command_args(State) of
+        [TemplateName] ->
+            Template = list_to_atom(TemplateName),
+            rebar_templater:new(Template, State),
+            {ok, State};
+        [] ->
+            {ok, State}
+    end.
+
+%% ===================================================================
+%% Internal functions
+%% ===================================================================
+
+info(create) ->
+    io_lib:format(
+       "Create skel based on template and vars.~n"
+       "~n"
+       "Valid command line options:~n"
+       "  template= [var=foo,...]~n", []);
+info(create_app) ->
+    io_lib:format(
+       "Create simple app skel.~n"
+       "~n"
+       "Valid command line options:~n"
+       "  [appid=myapp]~n", []);
+info(create_lib) ->
+    io_lib:format(
+       "Create simple lib skel.~n"
+       "~n"
+       "Valid command line options:~n"
+       "  [libid=mylib]~n", []);
+info(create_node) ->
+    io_lib:format(
+       "Create simple node skel.~n"
+       "~n"
+       "Valid command line options:~n"
+       "  [nodeid=mynode]~n", []);
+info(list_templates) ->
+    io_lib:format("List available templates.~n", []).
diff --git a/src/rebar_prv_update.erl b/src/rebar_prv_update.erl
index a12f5b0..c1aa14b 100644
--- a/src/rebar_prv_update.erl
+++ b/src/rebar_prv_update.erl
@@ -20,13 +20,13 @@
 -spec init(rebar_state:t()) -> {ok, rebar_state:t()}.
 init(State) ->
     State1 = rebar_state:add_provider(State, #provider{name = ?PROVIDER,
-                                                        provider_impl = ?MODULE,
-                                                        bare = false,
-                                                        deps = ?DEPS,
-                                                        example = "rebar update cowboy",
-                                                        short_desc = "",
-                                                        desc = "",
-                                                        opts = []}),
+                                                       provider_impl = ?MODULE,
+                                                       bare = false,
+                                                       deps = ?DEPS,
+                                                       example = "rebar update cowboy",
+                                                       short_desc = "",
+                                                       desc = "",
+                                                       opts = []}),
     {ok, State1}.
 
 -spec do(rebar_state:t()) -> {ok, rebar_state:t()} | relx:error().
diff --git a/src/rebar_templater.erl b/src/rebar_templater.erl
index dd89f3a..f22329b 100644
--- a/src/rebar_templater.erl
+++ b/src/rebar_templater.erl
@@ -26,19 +26,14 @@
 %% -------------------------------------------------------------------
 -module(rebar_templater).
 
--export(['create-app'/2,
-         'create-lib'/2,
-         'create-node'/2,
-         'list-templates'/2,
-         create/2]).
+-export([new/2,
+         list_templates/1,
+         create/1]).
 
 %% API for other utilities that need templating functionality
 -export([resolve_variables/2,
          render/2]).
 
-%% for internal use only
--export([info/2]).
-
 -include("rebar.hrl").
 
 -define(TEMPLATE_RE, "^[^._].*\\.template\$").
@@ -47,19 +42,15 @@
 %% Public API
 %% ===================================================================
 
-'create-app'(Config, _File) ->
-    %% Alias for create w/ template=simpleapp
-    create1(Config, "simpleapp").
-
-'create-lib'(Config, _File) ->
-    %% Alias for create w/ template=simplelib
-    create1(Config, "simplelib").
-
-'create-node'(Config, _File) ->
+new(app, Config) ->
+    create1(Config, "simpleapp");
+new(lib, Config) ->
+    create1(Config, "simplelib");
+new(node, Config) ->
     %% Alias for create w/ template=simplenode
     create1(Config, "simplenode").
 
-'list-templates'(Config, _File) ->
+list_templates(Config) ->
     {AvailTemplates, Files} = find_templates(Config),
     ?DEBUG("Available templates: ~p\n", [AvailTemplates]),
 
@@ -76,7 +67,7 @@
       end, AvailTemplates),
     ok.
 
-create(Config, _) ->
+create(Config) ->
     TemplateId = template_id(Config),
     create1(Config, TemplateId).
 
@@ -109,33 +100,6 @@ render(Bin, Context) ->
 %% Internal functions
 %% ===================================================================
 
-info(help, create) ->
-    ?CONSOLE(
-       "Create skel based on template and vars.~n"
-       "~n"
-       "Valid command line options:~n"
-       "  template= [var=foo,...]~n", []);
-info(help, 'create-app') ->
-    ?CONSOLE(
-       "Create simple app skel.~n"
-       "~n"
-       "Valid command line options:~n"
-       "  [appid=myapp]~n", []);
-info(help, 'create-lib') ->
-    ?CONSOLE(
-       "Create simple lib skel.~n"
-       "~n"
-       "Valid command line options:~n"
-       "  [libid=mylib]~n", []);
-info(help, 'create-node') ->
-    ?CONSOLE(
-       "Create simple node skel.~n"
-       "~n"
-       "Valid command line options:~n"
-       "  [nodeid=mynode]~n", []);
-info(help, 'list-templates') ->
-    ?CONSOLE("List available templates.~n", []).
-
 create1(Config, TemplateId) ->
     {AvailTemplates, Files} = find_templates(Config),
     ?DEBUG("Available templates: ~p\n", [AvailTemplates]),
@@ -168,7 +132,7 @@ create1(Config, TemplateId) ->
     end,
 
     %% Load variables from disk file, if provided
-    Context1 = case rebar_config:get_global(Config, template_vars, undefined) of
+    Context1 = case rebar_state:get(Config, template_vars, undefined) of
                    undefined ->
                        Context0;
                    File ->
@@ -201,7 +165,7 @@ create1(Config, TemplateId) ->
     ?DEBUG("Final template def ~p: ~p\n", [TemplateId, FinalTemplate]),
 
     %% Execute the instructions in the finalized template
-    Force = rebar_config:get_global(Config, force, "0"),
+    Force = rebar_state:get(Config, force, "0"),
     execute_template(Files, FinalTemplate, Type, Template, Context, Force, []).
 
 find_templates(Config) ->
@@ -224,11 +188,11 @@ cache_escript_files(Config) ->
                     fun(Name, _, GetBin, Acc) ->
                             [{Name, GetBin()} | Acc]
                     end,
-                    [], rebar_config:get_xconf(Config, escript)),
+                    [], rebar_state:get(Config, escript)),
     Files.
 
 template_id(Config) ->
-    case rebar_config:get_global(Config, template, undefined) of
+    case rebar_state:get(Config, template, undefined) of
         undefined ->
             ?ABORT("No template specified.\n", []);
         TemplateId ->
@@ -245,12 +209,11 @@ find_disk_templates(Config) ->
     HomeFiles = rebar_utils:find_files(filename:join([os:getenv("HOME"),
                                                       ".rebar", "templates"]),
                                        ?TEMPLATE_RE),
-    Recursive = rebar_config:is_recursive(Config),
-    LocalFiles = rebar_utils:find_files(".", ?TEMPLATE_RE, Recursive),
+    LocalFiles = rebar_utils:find_files(".", ?TEMPLATE_RE, true),
     [{file, F} || F <- OtherTemplates ++ HomeFiles ++ LocalFiles].
 
 find_other_templates(Config) ->
-    case rebar_config:get_global(Config, template_dir, undefined) of
+    case rebar_state:get(Config, template_dir, undefined) of
         undefined ->
             [];
         TemplateDir ->
@@ -296,7 +259,7 @@ parse_vars(Other, _Dict) ->
 update_vars(_Config, [], Dict) ->
     Dict;
 update_vars(Config, [Key | Rest], Dict) ->
-    Value = rebar_config:get_global(Config, Key, dict:fetch(Key, Dict)),
+    Value = rebar_state:get(Config, Key, dict:fetch(Key, Dict)),
     update_vars(Config, Rest, dict:store(Key, Value, Dict)).