add bash support

argv.go

@@ -1,5 +1,10 @@
 package main
 
+import (
+	"fmt"
+	"os"
+)
+
 /*
 	this parses the command line arguements
 
@@ -16,6 +21,8 @@ type args struct {
 	KeepFiles bool      `arg:"--keep-files"             help:"keep the build files/"`
 	Force     bool      `arg:"--force" default:"false"  help:"force overwrite an existing .deb file"`
 	Verbose   bool      `arg:"--verbose"                help:"show more things"`
+	Bash      bool      `arg:"--bash"                               help:"generate bash completion"`
+	BashAuto  []string  `arg:"--auto-complete"                      help:"todo: move this to go-arg"`
 }
 
 func (args) Version() string {
@@ -33,3 +40,38 @@ Example usage:
 This will pull down the go sources and
 the repositories in the go.sum file using git clone`
 }
+
+// prints help to STDERR // TODO: move everything below this to go-args
+func (args) doBashHelp() {
+	if argv.BashAuto[1] != "''" {
+		// if this is not blank, then the user has typed something
+		return
+	}
+	if argv.BashAuto[0] != ARGNAME {
+		// if this is not the name of the command, the user already started doing something
+		return
+	}
+	if argv.BashAuto[0] == ARGNAME {
+		me.pp.WriteHelp(os.Stderr)
+		return
+	}
+	fmt.Fprintln(os.Stderr, "")
+	fmt.Fprintln(os.Stderr, "hello world")
+	fmt.Fprintln(os.Stderr, "")
+}
+
+func (args) doBashAuto() {
+	// argv.doBashHelp()
+	switch argv.BashAuto[0] {
+	case "arch":
+		fmt.Println("riscv64")
+	case "build":
+		fmt.Println("user devel release")
+	default:
+		if argv.BashAuto[0] == ARGNAME {
+			// list the subcommands here
+			fmt.Println("arch build")
+		}
+	}
+	os.Exit(0)
+}

main.go

@@ -20,6 +20,7 @@ var DATE string
 //go:embed resources/*
 var resources embed.FS
 
+var ARGNAME string = "go-deb"
 var argv args
 
 func main() {
@@ -28,6 +29,15 @@ func main() {
 	gui.InitArg()
 	arg.MustParse(&argv)
 
+	if argv.Bash {
+		fhelp.DoBash(ARGNAME)
+		os.Exit(0)
+	}
+	if len(argv.BashAuto) != 0 {
+		argv.doBashAuto()
+		os.Exit(0)
+	}
+
 	if err := fhelp.ConfigureENV(); err != nil {
 		badExit(err)
 	}