Add pbx_lua as a method of doing extensions

Reported by: mnicholson
Patch by: mnicholson
Closes issue #11140


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@88250 65c4cc65-6c06-0410-ace0-fbb531ad65f3

utils/build-extensions-conf.lua

@@ -0,0 +1,81 @@
+#!/usr/bin/env lua
+--[[
+
+This utility can be used to generate an extensions.conf file to match an
+existing extensions.lua file.  As an argument it takes the patch of the
+extensions.lua file to read from, otherwise it uses
+/etc/asterisk/extensions.lua.
+
+This script can also be used to automatically include extensions.lua in
+extensions.conf via a #exec as well.
+
+#exec /usr/bin/build-extensions-conf.lua -c
+
+--]]
+
+usage = [[
+
+Usage:
+  ]] .. arg[0] .. [[ [options] [extensions.lua path]
+
+This utility can generate an extensions.conf file with all of the contexts in
+your extensions.lua file defined as including the Lua switch.  This is useful
+if you want to use your extensions.lua file exclusively.  By using this utility
+you dont't have to create each extension in extensions.conf manually.
+
+The resulting extensions.conf file is printed to standard output.
+
+  --contexts-only, -c	Don't print the [global] or [general] sections.  This
+			is useful for including the generated file into an
+			existing extensions.conf via #include or #exec.
+
+  --help, -h		Print this message.
+
+]]
+
+extensions_file = "/etc/asterisk/extensions.lua"
+
+options = {}
+
+for k, v in ipairs(arg) do
+	if v:sub(1, 1) == "-" then
+		if v == "-h" or v == "--help" then
+			print("match")
+			options["help"] = true
+		elseif v == "-c" or v == "--contexts-only" then
+			options["contexts-only"] = true
+		end
+	else
+		options["extensions-file"] = v
+	end
+end
+
+if options["help"] then
+	io.stderr:write(usage)
+	os.exit(0)
+end
+
+if options["extensions-file"] then
+	extensions_file = options["extensions-file"]
+end
+
+result, error_message = pcall(dofile, extensions_file)
+
+if not result then
+	io.stderr:write(error_message .. "\n")
+	os.exit(1)
+end
+
+if not extensions then
+	io.stderr:write("Error: extensions table not found in '" .. extensions_file .. "'\n")
+	os.exit(1)
+end
+
+if not options["contexts-only"] then
+	io.stdout:write("[general]\n\n[globals]\n\n")
+end
+
+for context, extens in pairs(extensions) do
+	io.stdout:write("[" .. tostring(context) ..  "]\nswitch => Lua\n\n")
+end
+