feat(api): adding api server code

templater can be used as a commmand line tool or as an api server.

cmd/templater.go

@@ -25,12 +25,12 @@ func Daemon(port int) (err error) {
 func main() {
 
 	var args struct {
-		Daemon bool   `arg:"-d,--daemon,env:TEMPLATER_DAEMON" default:"false"`
-		Port   int    `arg:"-p,--port,env:TEMPLATER_PORT" default:"8080"`
-		Type   string `arg:"-t,--type,env:TEMPLATE_TYPE" default:"hcl"`
-		File   string `arg:"-f,--template-file,env:TEMPLATE_FILE"`
-		Output string `arg:"-o,--output,env:TEMPLATER_OUTPUT" default:"stdout"`
-		Config string `arg:"-c,--config,env:TEMPLATE_CONFIG"`
+		Daemon bool   `arg:"-d,--daemon,env:TEMPLATER_DAEMON" default:"false" help:"Enable api server"`
+		Port   int    `arg:"-p,--port,env:TEMPLATER_PORT" default:"8080" help:"Listening port for the api server"`
+		Type   string `arg:"-t,--type,env:TEMPLATE_TYPE" default:"hcl" help:"Template type (go/template or hcl)"`
+		Output string `arg:"-o,--output,env:TEMPLATER_OUTPUT" default:"stdout" help:"Destination of the result (stdout or file path)"`
+		Config string `arg:"-c,--config,env:TEMPLATE_CONFIG" help:"Configuration values"`
+		File   string `arg:"-f,--template-file,env:TEMPLATE_FILE" help:"Template file path"`
 	}
 
 	arg.MustParse(&args)