translate: support usage translations

See #628

cli/run.go

@@ -19,6 +19,35 @@ import (
 	"github.com/spf13/cobra/doc"
 )
 
+var (
+	// translators: `abra` usage template. please translate only words like
+	// "Aliases" and "Example" and nothing inside the {{ ... }}
+	usageTemplate = i18n.G(`Usage:{{if .Runnable}}
+  {{.UseLine}}{{end}}{{if .HasAvailableSubCommands}}
+  {{.CommandPath}} [command]{{end}}{{if gt (len .Aliases) 0}}
+
+Aliases:
+  {{.NameAndAliases}}{{end}}{{if .HasExample}}
+
+Examples:
+{{.Example}}{{end}}{{if .HasAvailableSubCommands}}
+
+Available Commands:{{range .Commands}}{{if (or .IsAvailableCommand (eq .Name "help"))}}
+  {{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{end}}{{if .HasAvailableLocalFlags}}
+
+Flags:
+{{.LocalFlags.FlagUsages | trimTrailingWhitespaces}}{{end}}{{if .HasAvailableInheritedFlags}}
+
+Global Flags:
+{{.InheritedFlags.FlagUsages | trimTrailingWhitespaces}}{{end}}{{if .HasHelpSubCommands}}
+
+Additional help topics:{{range .Commands}}{{if .IsAdditionalHelpTopicCommand}}
+  {{rpad .CommandPath .CommandPathPadding}} {{.Short}}{{end}}{{end}}{{end}}{{if .HasAvailableSubCommands}}
+
+Use "{{.CommandPath}} [command] --help" for more information about a command.{{end}}
+`)
+)
+
 func Run(version, commit string) {
 	rootCmd := &cobra.Command{
 		// translators: `abra` binary name
@@ -35,7 +64,6 @@ func Run(version, commit string) {
 			i18n.G("server"),
 			i18n.G("upgrade"),
 		},
-
 		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
 			dirs := []map[string]os.FileMode{
 				{config.ABRA_DIR: 0764},
@@ -78,6 +106,7 @@ func Run(version, commit string) {
 	}
 
 	rootCmd.CompletionOptions.DisableDefaultCmd = true
+	rootCmd.SetUsageTemplate(usageTemplate)
 
 	manCommand := &cobra.Command{
 		// translators: `man` command