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package app
/*
This file is part of the App project.
Copyright (C) 2021 Alexander Kiryukhin <a.kiryukhin@mail.ru>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
@license GPL-3.0+ <http://spdx.org/licenses/GPL-3.0+>
*/
import (
"fmt"
"os"
)
type App struct {
commands []Command
}
var ErrNoCommand = fmt.Errorf("No command provided")
// New returns new App.
func New(commands []Command) *App {
return &App{commands: commands}
}
// Start cli application
func (a *App) Start(args []string) error {
if len(args) < 2 {
return a.showHelpAndExit()
}
cmd := args[1]
for _, c := range a.commands {
if cmd == c.Name() {
fs := c.Flags()
if err := fs.Parse(args[2:]); err != nil {
fs.Usage()
return err
}
if err := c.Run(fs.Args()); err != nil {
return err
}
return nil
}
}
return a.showHelpAndExit()
}
func (a *App) showHelpAndExit() error {
fmt.Printf("Usage: %s [command]\nCommands:\n", os.Args[0])
for _, c := range a.commands {
fmt.Printf("\t%s - %s", c.Name(), c.Usage())
}
return ErrNoCommand
}
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