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|
// Package cmd used for command line options for the complete tool
package cmd
import (
"errors"
"flag"
"fmt"
"os"
"strings"
"github.com/posener/complete/cmd/install"
)
// CLI for command line
type CLI struct {
Name string
InstallName string
UninstallName string
install bool
uninstall bool
yes bool
}
const (
defaultInstallName = "install"
defaultUninstallName = "uninstall"
)
// Run is used when running complete in command line mode.
// this is used when the complete is not completing words, but to
// install it or uninstall it.
func (f *CLI) Run() bool {
fs := flag.NewFlagSet(f.Name, 0)
// add flags and parse them in case they were not added and parsed
// by the main program
f.AddFlags(fs)
fs.Parse(os.Args[1:])
err := f.validate()
if err != nil {
os.Stderr.WriteString(err.Error() + "\n")
os.Exit(1)
}
switch {
case f.install:
f.prompt()
err = install.Install(f.Name)
case f.uninstall:
f.prompt()
err = install.Uninstall(f.Name)
default:
// non of the action flags matched,
// returning false should make the real program execute
return false
}
if err != nil {
fmt.Printf("%s failed! %s\n", f.action(), err)
os.Exit(3)
}
fmt.Println("Done!")
return true
}
// prompt use for approval
// exit if approval was not given
func (f *CLI) prompt() {
defer fmt.Println(f.action() + "ing...")
if f.yes {
return
}
fmt.Printf("%s completion for %s? ", f.action(), f.Name)
var answer string
fmt.Scanln(&answer)
switch strings.ToLower(answer) {
case "y", "yes":
return
default:
fmt.Println("Cancelling...")
os.Exit(1)
}
}
// AddFlags adds the CLI flags to the flag set.
// If flags is nil, the default command line flags will be taken.
// Pass non-empty strings as installName and uninstallName to override the default
// flag names.
func (f *CLI) AddFlags(flags *flag.FlagSet) {
if flags == nil {
flags = flag.CommandLine
}
if f.InstallName == "" {
f.InstallName = defaultInstallName
}
if f.UninstallName == "" {
f.UninstallName = defaultUninstallName
}
if flags.Lookup(f.InstallName) == nil {
flags.BoolVar(&f.install, f.InstallName, false,
fmt.Sprintf("Install completion for %s command", f.Name))
}
if flags.Lookup(f.UninstallName) == nil {
flags.BoolVar(&f.uninstall, f.UninstallName, false,
fmt.Sprintf("Uninstall completion for %s command", f.Name))
}
if flags.Lookup("y") == nil {
flags.BoolVar(&f.yes, "y", false, "Don't prompt user for typing 'yes'")
}
}
// validate the CLI
func (f *CLI) validate() error {
if f.install && f.uninstall {
return errors.New("Install and uninstall are mutually exclusive")
}
return nil
}
// action name according to the CLI values.
func (f *CLI) action() string {
switch {
case f.install:
return "Install"
case f.uninstall:
return "Uninstall"
default:
return "unknown"
}
}
|
