Add basic for-each-ref command

cmd/foreachref.go

@@ -0,0 +1,51 @@
+package cmd
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/driusan/dgit/git"
+)
+
+func ForEachRef(c *git.Client, args []string) error {
+	flags := flag.NewFlagSet("for-each-ref", flag.ExitOnError)
+	flags.SetOutput(flag.CommandLine.Output())
+	flags.Usage = func() {
+		flag.Usage()
+		fmt.Fprintf(flag.CommandLine.Output(), "\n\nOptions:\n")
+		flags.PrintDefaults()
+	}
+
+	// These flags can be moved out of these lists and below as proper flags as they are implemented
+	for _, sf := range []string{"format"} {
+		flags.Var(newNotimplStringValue(), sf, "Not implemented")
+	}
+
+	flags.Parse(args)
+	refs, err := git.ShowRef(c, git.ShowRefOptions{}, []string{})
+	if err != nil {
+		return err
+	}
+
+	patterns := flags.Args()
+
+	for _, ref := range refs {
+		if len(patterns) == 0 {
+			fmt.Printf("%s %s\t%s\n", ref.Value, "commit", ref.Name) // FIXME check if commit or other object type
+		} else {
+			for _, pattern := range patterns {
+				if strings.HasPrefix(ref.Name, pattern) { // FIXME support actual patterns and match only on path segments
+					fmt.Printf("%s %s\t%s\n", ref.Value, "commit", ref.Name) // FIXME check if commit or other object type
+					break
+				}
+			}
+		}
+	}
+
+	if len(refs) == 0 {
+		os.Exit(1)
+	}
+	return nil
+}

main.go

@@ -434,6 +434,12 @@ func main() {
 			fmt.Fprintln(os.Stderr, err)
 			os.Exit(4)
 		}
+	case "for-each-ref":
+		subcommandUsage = "[<pattern>...]"
+		if err := cmd.ForEachRef(c, args); err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			os.Exit(4)
+		}
 	case "ls-remote":
 		subcommandUsage = "[repo [<patterns>..]]"
 		if err := cmd.LsRemote(c, args); err != nil {