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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2018 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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 <http://www.gnu.org/licenses/>.
*
*/
package ui
import (
"fmt"
"os"
"strings"
"time"
"github.com/snapcore/snapd/osutil"
)
// UI is an interface for user interaction
type UI interface {
// YesNo asks a yes/no question. The primary text
// will be printed in a larger font, the secondary text
// in the standard font and the (optional) footer will
// be printed in a small font.
//
// The value "true" is returned if the user clicks "yes",
// otherwise "false".
YesNo(primary, secondary string, options *DialogOptions) bool
}
// Options for the UI interface
type DialogOptions struct {
Footer string
Timeout time.Duration
}
var hasZenityExecutable = func() bool {
return osutil.ExecutableExists("zenity")
}
var hasKDialogExecutable = func() bool {
return osutil.ExecutableExists("kdialog")
}
func MockHasZenityExecutable(f func() bool) func() {
oldHasZenityExecutable := hasZenityExecutable
hasZenityExecutable = f
return func() {
hasZenityExecutable = oldHasZenityExecutable
}
}
func MockHasKDialogExecutable(f func() bool) func() {
oldHasKDialogExecutable := hasKDialogExecutable
hasKDialogExecutable = f
return func() {
hasKDialogExecutable = oldHasKDialogExecutable
}
}
// New returns the best matching UI interface for the given system
// or an error if no ui can be created.
func New() (UI, error) {
hasZenity := hasZenityExecutable()
hasKDialog := hasKDialogExecutable()
switch {
case hasZenity && hasKDialog:
// prefer kdialog on KDE, otherwise use zenity
currentDesktop := os.Getenv("XDG_CURRENT_DESKTOP")
if strings.Contains("kde", strings.ToLower(currentDesktop)) {
return &KDialog{}, nil
}
return &Zenity{}, nil
case hasZenity:
return &Zenity{}, nil
case hasKDialog:
return &KDialog{}, nil
default:
return nil, fmt.Errorf("cannot create a UI: please install zenity or kdialog")
}
}
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