prototype get-wrapper docopts.sh for #60

docopts.go

@@ -5,6 +5,7 @@
 package main
 
 import (
+	_ "embed"
 	"fmt"
 	"github.com/docopt/docopt-go"
 	"io"
@@ -43,6 +44,7 @@ Usage:
   docopts [options] [--no-declare] -A <name>   -h <msg> : [<argv>...]
   docopts [options] -G <prefix>  -h <msg> : [<argv>...]
   docopts [options] --no-mangle  -h <msg> : [<argv>...]
+  docopts get-wrapper docopts.sh
 
 Options:
   -h <msg>, --help=<msg>        The help message in docopt format.
@@ -79,12 +81,19 @@ Options:
                                 with -A argument.
   --debug                       Output extra parsing information for debugging.
                                 Output cannot be used in bash eval.
+
+Actions:
+  get-wrapper docopts.sh        Print docopts.sh source content on stdout and quit.
 `
 
 // testing trick, out can be mocked to catch stdout and validate
 // https://stackoverflow.com/questions/34462355/how-to-deal-with-the-fmt-golang-library-package-for-cli-testing
 var out io.Writer = os.Stdout
 
+// load the entire file into a string at compile time
+//go:embed docopts.sh
+var docopts_sh string
+
 // debug helper
 func print_args(args docopt.Opts, message string) {
 	fmt.Printf("################## %s ##################\n", message)
@@ -391,6 +400,11 @@ func main() {
 		panic(msg)
 	}
 
+	if arguments["get-wrapper"].(bool) {
+		fmt.Print(docopts_sh)
+		os.Exit(0)
+	}
+
 	debug := arguments["--debug"].(bool)
 	if debug {
 		print_args(arguments, "golang")