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