feat: multi-select candidates in interactive mode

README.md

@@ -64,8 +64,9 @@ $ gh sub-pattern -r main --tags v | jq -R . | jq -s .
 
 Without any target flag and with a terminal attached, the extension lists the repository's
 environments, branches, tags, `pull_request` and derived prefix globs (e.g. `release/*`) in
-[fzf](https://github.com/junegunn/fzf). Pick one, or type your own ref/glob and press enter.
-Without fzf it falls back to gh's built-in selector (no free-text input).
+[fzf](https://github.com/junegunn/fzf). Mark several candidates with Tab, or type your own
+ref/glob; Enter prints one pattern per selection. Without fzf it falls back to gh's built-in
+multi-select (no free-text input).
 
 ## Subject format
 

main.go

@@ -82,15 +82,17 @@ func run(cli CLI) error {
 		if !term.IsTerminal(os.Stdin) {
 			return errors.New("no --environment, --ref(s) or --tag(s) given and stdin is not a terminal")
 		}
-		choice, err := pick(repo.Host, fullName)
+		choices, err := pick(repo.Host, fullName)
 		if err != nil {
 			return err
 		}
-		suffix, err := parseChoice(choice)
-		if err != nil {
-			return err
+		for _, c := range choices {
+			suffix, err := parseChoice(c)
+			if err != nil {
+				return err
+			}
+			subs = append(subs, suffix)
 		}
-		subs = []string{suffix}
 	}
 	for _, s := range subs {
 		fmt.Fprintln(stdout, "repo:"+repoSegment(info, immutable)+":"+s)
@@ -183,7 +185,7 @@ func candidates(envs, branches, tags []string) []string {
 	return out
 }
 
-func pick(host, fullName string) (string, error) {
+func pick(host, fullName string) ([]string, error) {
 	list := func(path, jq string) []string {
 		out, _, err := gh.Exec("api", "--hostname", host, "--paginate", "repos/"+fullName+"/"+path, "--jq", jq)
 		if err != nil {
@@ -200,16 +202,23 @@ func pick(host, fullName string) (string, error) {
 		return fzf(items)
 	}
 	// shortcut: no free-text glob without fzf; add prompter.Input if non-fzf users need it.
-	idx, err := prompter.New(os.Stdin, os.Stderr, os.Stderr).Select("sub for "+fullName, "", items)
+	idxs, err := prompter.New(os.Stdin, os.Stderr, os.Stderr).MultiSelect("sub for "+fullName, nil, items)
 	if err != nil {
-		return "", err
+		return nil, err
+	}
+	if len(idxs) == 0 {
+		return nil, errors.New("nothing selected")
+	}
+	picked := make([]string, len(idxs))
+	for i, idx := range idxs {
+		picked[i] = items[idx]
 	}
-	return items[idx], nil
+	return picked, nil
 }
 
-func fzf(items []string) (string, error) {
-	cmd := exec.Command("fzf", "--print-query", "--exact", "--no-multi", "--prompt", "sub> ",
-		"--header", "Pick a candidate or type a ref/glob (e.g. release/*) and press enter")
+func fzf(items []string) ([]string, error) {
+	cmd := exec.Command("fzf", "--print-query", "--exact", "--multi", "--prompt", "sub> ",
+		"--header", "Tab marks several candidates; or type a ref/glob (e.g. release/*). Enter to finish")
 	cmd.Stdin = strings.NewReader(strings.Join(items, "\n"))
 	cmd.Stderr = os.Stderr
 	out, err := cmd.Output()
@@ -218,11 +227,11 @@ func fzf(items []string) (string, error) {
 	noMatch := errors.As(err, &exit) && exit.ExitCode() == 1
 	switch {
 	case err == nil && len(lines) > 1:
-		return lines[1], nil
+		return lines[1:], nil
 	case (err == nil || noMatch) && lines[0] != "":
-		return lines[0], nil // free-text query
+		return lines[:1], nil // free-text query
 	default:
-		return "", errors.New("selection cancelled")
+		return nil, errors.New("selection cancelled")
 	}
 }
 

run_test.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"slices"
 	"strings"
 	"testing"
 
@@ -127,17 +128,19 @@ func TestResolveRepoCurrent(t *testing.T) {
 
 func TestFzf(t *testing.T) {
 	for name, tc := range map[string]struct {
-		script, want string
-		wantErr      bool
+		script  string
+		want    []string
+		wantErr bool
 	}{
-		"selection": {`printf 'ma\nref:refs/heads/main\n'`, "ref:refs/heads/main", false},
-		"free text": {`printf 'release/2.x/*\n'; exit 1`, "release/2.x/*", false},
-		"cancelled": {`exit 130`, "", true},
+		"selection": {`printf 'ma\nref:refs/heads/main\n'`, []string{"ref:refs/heads/main"}, false},
+		"multi":     {`printf '\npull_request\nref:refs/tags/*\n'`, []string{"pull_request", "ref:refs/tags/*"}, false},
+		"free text": {`printf 'release/2.x/*\n'; exit 1`, []string{"release/2.x/*"}, false},
+		"cancelled": {`exit 130`, nil, true},
 	} {
 		t.Run(name, func(t *testing.T) {
 			fakeBin(t, "fzf", "cat >/dev/null\n"+tc.script)
 			got, err := fzf([]string{"ref:refs/heads/main"})
-			if (err != nil) != tc.wantErr || got != tc.want {
+			if (err != nil) != tc.wantErr || !slices.Equal(got, tc.want) {
 				t.Errorf("got %q, %v", got, err)
 			}
 		})
@@ -154,7 +157,7 @@ esac`))
 	fakeBin(t, "fzf", `cat > "`+cands+`"; printf '\nref:refs/heads/release/*\n'`)
 
 	got, err := pick("github.com", "octo-org/octo-repo")
-	if err != nil || got != "ref:refs/heads/release/*" {
+	if err != nil || !slices.Equal(got, []string{"ref:refs/heads/release/*"}) {
 		t.Fatalf("got %q, %v", got, err)
 	}
 	listed, _ := os.ReadFile(cands)