5fef7f5727
Several standard Go tool flags are not supported yet, those will come in followup CLs. Change-Id: I1d98afccf3063d7a3313f66b9fd57067fcfa5297 Reviewed-on: https://go-review.googlesource.com/4450 Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
124 lines
2.3 KiB
Go
124 lines
2.3 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/*
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Gomobile is a tool for building and running mobile apps written in Go.
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The tool is under development and not ready for use.
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*/
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package main
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import (
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"bufio"
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"flag"
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"fmt"
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"html/template"
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"io"
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"log"
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"os"
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)
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func printUsage(w io.Writer) {
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bufw := bufio.NewWriter(w)
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if err := usageTmpl.Execute(bufw, commands); err != nil {
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panic(err)
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}
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bufw.Flush()
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}
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var gomobileName = "gomobile"
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func main() {
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gomobileName = os.Args[0]
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flag.Usage = func() {
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printUsage(os.Stderr)
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os.Exit(2)
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}
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flag.Parse()
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log.SetFlags(0)
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args := flag.Args()
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if len(args) < 1 {
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flag.Usage()
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}
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if args[0] == "help" {
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help(args[1:])
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return
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}
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for _, cmd := range commands {
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if cmd.Name == args[0] {
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cmd.flag.Usage = cmd.usage
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cmd.flag.Parse(args[1:])
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if err := cmd.run(cmd); err != nil {
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msg := err.Error()
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if msg != "" {
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fmt.Fprintf(os.Stderr, "%s: %v\n", os.Args[0], err)
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}
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os.Exit(1)
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}
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return
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}
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}
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fmt.Fprintf(os.Stderr, "%s: unknown subcommand %q\nRun 'gomobile help' for usage.\n", os.Args[0], args[0])
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os.Exit(2)
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}
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func help(args []string) {
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if len(args) == 0 {
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printUsage(os.Stdout)
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return // succeeded at helping
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}
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if len(args) != 1 {
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fmt.Fprintf(os.Stderr, "usage: %s help command\n\nToo many arguments given.\n", gomobileName)
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os.Exit(2) // failed to help
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}
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arg := args[0]
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for _, cmd := range commands {
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if cmd.Name == arg {
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cmd.usage()
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return // succeeded at helping
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}
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}
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fmt.Fprintf(os.Stderr, "Unknown help topic %#q. Run '%s help'.\n", arg, gomobileName)
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os.Exit(2)
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}
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var commands = []*command{
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// TODO(crawshaw): cmdRun
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cmdBuild,
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cmdInit,
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cmdInstall,
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}
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type command struct {
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run func(*command) error
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flag flag.FlagSet
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Name string
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Usage string
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Short string
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Long string
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}
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func (cmd *command) usage() {
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fmt.Fprintf(os.Stdout, "usage: %s %s\n%s", gomobileName, cmd.Usage, cmd.Long)
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}
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var usageTmpl = template.Must(template.New("usage").Parse(
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`Gomobile is a tool for building Android and iOS Go apps.
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Usage:
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gomobile command [arguments]
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Commands:
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{{range .}}
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{{.Name | printf "%-11s"}} {{.Short}}{{end}}
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Use 'gomobile help [command]' for more information about that command.
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`))
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