Move templates outside the source .mk filestemplates

Templates now no longer use Make variables for substitution
but instead replace strings with their equivalent:

  template_name: Corresponds to n=template_name
  project_name:  Corresponds to $(PROJECT) or in=project_name

This allows defining templates outside of Makefiles. For
example an external plugin could define their templates
in templates/my_template.erl and then have the following
in the included Makefile:

  tpl_my_template = $(file < $(THIS)/templates/my_template.erl)

By default the created file will be in src/template_name.erl.
This can be overriden with the tplp_* variable:

  tplp_my_template = src/model/my_template.erl

Substitution is applied both to the template contents and
to its path.

In addition, attempting to overwrite an existing file when
creating a template will result in failure.

1 files changed, 31 insertions, 0 deletions

diff --git a/templates/cowboy_websocket_h.erl b/templates/cowboy_websocket_h.erl
new file mode 100644
index 0000000..538f020
--- /dev/null
+++ b/templates/cowboy_websocket_h.erl
@@ -0,0 +1,31 @@
+-module(template_name).
+-behaviour(cowboy_websocket_handler).
+
+-export([init/3]).
+-export([websocket_init/3]).
+-export([websocket_handle/3]).
+-export([websocket_info/3]).
+-export([websocket_terminate/3]).
+
+-record(state, {
+}).
+
+init(_, _, _) ->
+	{upgrade, protocol, cowboy_websocket}.
+
+websocket_init(_, Req, _Opts) ->
+	Req2 = cowboy_req:compact(Req),
+	{ok, Req2, #state{}}.
+
+websocket_handle({text, Data}, Req, State) ->
+	{reply, {text, Data}, Req, State};
+websocket_handle({binary, Data}, Req, State) ->
+	{reply, {binary, Data}, Req, State};
+websocket_handle(_Frame, Req, State) ->
+	{ok, Req, State}.
+
+websocket_info(_Info, Req, State) ->
+	{ok, Req, State}.
+
+websocket_terminate(_Reason, _Req, _State) ->
+	ok.