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, 25 insertions, 0 deletions

diff --git a/templates/ranch_protocol.erl b/templates/ranch_protocol.erl
new file mode 100644
index 0000000..1458815
--- /dev/null
+++ b/templates/ranch_protocol.erl
@@ -0,0 +1,25 @@
+-module(template_name).
+-behaviour(ranch_protocol).
+
+-export([start_link/4]).
+-export([init/4]).
+
+-type opts() :: [].
+-export_type([opts/0]).
+
+-record(state, {
+	socket :: inet:socket(),
+	transport :: module()
+}).
+
+start_link(Ref, Socket, Transport, Opts) ->
+	Pid = spawn_link(?MODULE, init, [Ref, Socket, Transport, Opts]),
+	{ok, Pid}.
+
+-spec init(ranch:ref(), inet:socket(), module(), opts()) -> ok.
+init(Ref, Socket, Transport, _Opts) ->
+	ok = ranch:accept_ack(Ref),
+	loop(#state{socket=Socket, transport=Transport}).
+
+loop(State) ->
+	loop(State).