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cmd_aliases.go
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cmd_aliases.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016 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 main
import (
"fmt"
"sort"
"strings"
"github.com/jessevdk/go-flags"
"github.com/snapcore/snapd/client"
"github.com/snapcore/snapd/i18n"
)
type cmdAliases struct {
clientMixin
Positionals struct {
Snap installedSnapName `positional-arg-name:"<snap>"`
} `positional-args:"true"`
}
var shortAliasesHelp = i18n.G("List aliases in the system")
var longAliasesHelp = i18n.G(`
The aliases command lists all aliases available in the system and their status.
$ snap aliases <snap>
Lists only the aliases defined by the specified snap.
`)
func init() {
addCommand("aliases", shortAliasesHelp, longAliasesHelp, func() flags.Commander {
return &cmdAliases{}
}, nil, nil)
}
type aliasInfo struct {
Snap string
Command string
Alias string
Status string
Auto string
}
type aliasInfos []*aliasInfo
func (infos aliasInfos) Len() int { return len(infos) }
func (infos aliasInfos) Swap(i, j int) { infos[i], infos[j] = infos[j], infos[i] }
func (infos aliasInfos) Less(i, j int) bool {
if infos[i].Snap < infos[j].Snap {
return true
}
if infos[i].Snap == infos[j].Snap {
if infos[i].Command < infos[j].Command {
return true
}
if infos[i].Command == infos[j].Command {
if infos[i].Alias < infos[j].Alias {
return true
}
}
}
return false
}
func (x *cmdAliases) Execute(args []string) error {
if len(args) > 0 {
return ErrExtraArgs
}
allStatuses, err := x.client.Aliases()
if err != nil {
return err
}
var infos aliasInfos
filterSnap := string(x.Positionals.Snap)
if filterSnap != "" {
allStatuses = map[string]map[string]client.AliasStatus{
filterSnap: allStatuses[filterSnap],
}
}
for snapName, aliasStatuses := range allStatuses {
for alias, aliasStatus := range aliasStatuses {
infos = append(infos, &aliasInfo{
Snap: snapName,
Command: aliasStatus.Command,
Alias: alias,
Status: aliasStatus.Status,
Auto: aliasStatus.Auto,
})
}
}
if len(infos) > 0 {
w := tabWriter()
fmt.Fprintln(w, i18n.G("Command\tAlias\tNotes"))
defer w.Flush()
sort.Sort(infos)
for _, info := range infos {
var notes []string
if info.Status != "auto" {
notes = append(notes, info.Status)
if info.Status == "manual" && info.Auto != "" {
notes = append(notes, "override")
}
}
notesStr := strings.Join(notes, ",")
if notesStr == "" {
notesStr = "-"
}
fmt.Fprintf(w, "%s\t%s\t%s\n", info.Command, info.Alias, notesStr)
}
} else {
if filterSnap != "" {
fmt.Fprintf(Stderr, i18n.G("No aliases are currently defined for snap %q.\n"), filterSnap)
} else {
fmt.Fprintln(Stderr, i18n.G("No aliases are currently defined."))
}
fmt.Fprintln(Stderr, i18n.G("\nUse 'snap help alias' to learn how to create aliases manually."))
}
return nil
}