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registry.go
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registry.go
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package commandregistry
import (
"fmt"
"os"
"strings"
"unicode/utf8"
"code.cloudfoundry.org/cli/cf"
"code.cloudfoundry.org/cli/cf/flags"
. "code.cloudfoundry.org/cli/cf/i18n"
"code.cloudfoundry.org/cli/command/translatableerror"
"code.cloudfoundry.org/cli/util/configv3"
. "code.cloudfoundry.org/cli/cf/terminal"
)
var _ = initI18nFunc()
var Commands = NewRegistry()
func initI18nFunc() bool {
config, err := configv3.LoadConfig()
var configErrTemplate string
if err != nil {
if ce, ok := err.(translatableerror.EmptyConfigError); ok {
configErrTemplate = ce.Error()
} else {
fmt.Println(FailureColor("FAILED"))
fmt.Println("Error read/writing config: ", err.Error())
os.Exit(1)
}
}
T = Init(config)
if err != nil {
fmt.Fprintf(os.Stderr, fmt.Sprintf("%s\n", T(configErrTemplate, map[string]interface{}{
"FilePath": configv3.ConfigFilePath(),
})))
}
return true
}
type registry struct {
cmd map[string]Command
alias map[string]string
}
func NewRegistry() *registry {
return ®istry{
cmd: make(map[string]Command),
alias: make(map[string]string),
}
}
func Register(cmd Command) {
m := cmd.MetaData()
Commands.cmd[m.Name] = cmd
Commands.alias[m.ShortName] = m.Name
}
func (r *registry) FindCommand(name string) Command {
if _, ok := r.cmd[name]; ok {
return r.cmd[name]
}
if alias, exists := r.alias[name]; exists {
return r.cmd[alias]
}
return nil
}
func (r *registry) CommandExists(name string) bool {
if strings.TrimSpace(name) == "" {
return false
}
var ok bool
if _, ok = r.cmd[name]; !ok {
alias, exists := r.alias[name]
if exists {
_, ok = r.cmd[alias]
}
}
return ok
}
func (r *registry) ListCommands() []string {
keys := make([]string, len(r.cmd))
i := 0
for k := range r.cmd {
keys[i] = k
i++
}
return keys
}
func (r *registry) SetCommand(cmd Command) {
r.cmd[cmd.MetaData().Name] = cmd
}
func (r *registry) RemoveCommand(cmdName string) {
delete(r.cmd, cmdName)
}
func (r *registry) TotalCommands() int {
return len(r.cmd)
}
func (r *registry) MaxCommandNameLength() int {
maxNameLen := 0
for name := range r.cmd {
if nameLen := utf8.RuneCountInString(name); nameLen > maxNameLen {
maxNameLen = nameLen
}
}
return maxNameLen
}
func (r *registry) Metadatas() []CommandMetadata {
var m []CommandMetadata
for _, c := range r.cmd {
m = append(m, c.MetaData())
}
return m
}
func (r *registry) CommandUsage(cmdName string) string {
cmd := r.FindCommand(cmdName)
return CLICommandUsagePresenter(cmd).Usage()
}
type usagePresenter struct {
cmd Command
}
func CLICommandUsagePresenter(cmd Command) *usagePresenter {
return &usagePresenter{
cmd: cmd,
}
}
func (u *usagePresenter) Usage() string {
metadata := u.cmd.MetaData()
output := T("NAME:") + "\n"
output += " " + metadata.Name + " - " + metadata.Description + "\n\n"
output += T("USAGE:") + "\n"
output += " " + strings.Replace(strings.Join(metadata.Usage, ""), "CF_NAME", cf.Name, -1) + "\n"
if len(metadata.Examples) > 0 {
output += "\n"
output += fmt.Sprintf("%s:\n", T("EXAMPLES"))
for _, e := range metadata.Examples {
output += fmt.Sprintf(" %s\n", strings.Replace(e, "CF_NAME", cf.Name, -1))
}
}
if metadata.ShortName != "" {
output += "\n" + T("ALIAS:") + "\n"
output += " " + metadata.ShortName + "\n"
}
if metadata.Flags != nil {
output += "\n" + T("OPTIONS:") + "\n"
output += flags.NewFlagContext(metadata.Flags).ShowUsage(3)
}
return output
}