Merge pull request #945 from middelink/fix-942

Add bash autocompletion generation

src/cmds/restic/cmd_autocomplete.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"github.com/spf13/cobra"
+)
+
+var autocompleteTarget string
+
+var cmdAutocomplete = &cobra.Command{
+	Use:   "autocomplete",
+	Short: "generate shell autocompletion script",
+	Long: `The "autocomplete" command generates a shell autocompletion script.
+
+NOTE: The current version supports Bash only.
+      This should work for *nix systems with Bash installed.
+
+By default, the file is written directly to /etc/bash_completion.d
+for convenience, and the command may need superuser rights, e.g.:
+
+$ sudo restic autocomplete`,
+
+	RunE: func(cmd *cobra.Command, args []string) error {
+		if err := cmdRoot.GenBashCompletionFile(autocompleteTarget); err != nil {
+			return err
+		}
+		return nil
+	},
+}
+
+func init() {
+	cmdRoot.AddCommand(cmdAutocomplete)
+
+	cmdAutocomplete.Flags().StringVarP(&autocompleteTarget, "completionfile", "", "/etc/bash_completion.d/restic.sh", "autocompletion file")
+	// For bash-completion
+	cmdAutocomplete.Flags().SetAnnotation("completionfile", cobra.BashCompFilenameExt, []string{})
+}