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// Copyright 2013 Unknown
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
// ui18n is a helper tool for Unknwon/i18n package.
package main
import (
"flag"
"fmt"
"html/template"
"io"
"log"
"os"
"strings"
)
type Command struct {
// Run runs the command.
// The args are the arguments after the command name.
Run func(cmd *Command, args []string)
// UsageLine is the one-line usage message.
// The first word in the line is taken to be the command name.
UsageLine string
// Short is the short description shown in the 'go help' output.
Short string
// Long is the long message shown in the 'go help <this-command>' output.
Long string
// Flag is a set of flags specific to this command.
Flag flag.FlagSet
// CustomFlags indicates that the command will do its own
// flag parsing.
CustomFlags bool
}
// Name returns the command's name: the first word in the usage line.
func (c *Command) Name() string {
name := c.UsageLine
i := strings.Index(name, " ")
if i >= 0 {
name = name[:i]
}
return name
}
func (c *Command) Usage() {
fmt.Fprintf(os.Stderr, "usage: %s\n\n", c.UsageLine)
fmt.Fprintf(os.Stderr, "%s\n", strings.TrimSpace(c.Long))
os.Exit(2)
}
// Runnable reports whether the command can be run; otherwise
// it is a documentation pseudo-command such as importpath.
func (c *Command) Runnable() bool {
return c.Run != nil
}
var commands = []*Command{
cmdSync,
}
func main() {
flag.Usage = usage
flag.Parse()
log.SetFlags(0)
args := flag.Args()
if len(args) < 1 {
usage()
}
if args[0] == "help" {
help(args[1:])
return
}
for _, cmd := range commands {
if cmd.Name() == args[0] && cmd.Run != nil {
cmd.Flag.Usage = func() { cmd.Usage() }
if cmd.CustomFlags {
args = args[1:]
} else {
cmd.Flag.Parse(args[1:])
args = cmd.Flag.Args()
}
cmd.Run(cmd, args)
os.Exit(2)
return
}
}
fmt.Fprintf(os.Stderr, "ui18n: unknown subcommand %q\nRun 'bee help' for usage.\n", args[0])
os.Exit(2)
}
var usageTemplate = `ui18n is a helper tool for beego/i18n package.
Usage:
ui18n command [arguments]
The commands are:
{{range .}}{{if .Runnable}}
{{.Name | printf "%-11s"}} {{.Short}}{{end}}{{end}}
Use "ui18n help [command]" for more information about a command.
`
var helpTemplate = `{{if .Runnable}}usage: ui18n {{.UsageLine}}
{{end}}{{.Long | trim}}
`
func usage() {
tmpl(os.Stdout, usageTemplate, commands)
os.Exit(2)
}
func tmpl(w io.Writer, text string, data interface{}) {
t := template.New("top")
t.Funcs(template.FuncMap{"trim": strings.TrimSpace})
template.Must(t.Parse(text))
if err := t.Execute(w, data); err != nil {
panic(err)
}
}
func help(args []string) {
if len(args) == 0 {
usage()
// not exit 2: succeeded at 'go help'.
return
}
if len(args) != 1 {
fmt.Fprintf(os.Stdout, "usage: ui18n help command\n\nToo many arguments given.\n")
os.Exit(2) // failed at 'bee help'
}
arg := args[0]
for _, cmd := range commands {
if cmd.Name() == arg {
tmpl(os.Stdout, helpTemplate, cmd)
// not exit 2: succeeded at 'go help cmd'.
return
}
}
fmt.Fprintf(os.Stdout, "Unknown help topic %#q. Run 'ui18n help'.\n", arg)
os.Exit(2) // failed at 'bee help cmd'
}
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