Add offline-first task-master TUI with tickets, board lists, and undo.

Charm-based CLI with JSON persistence, status/list filters, external editor editing, command-history undo/redo, and glamour markdown without AutoStyle OSC hangs.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/ticket/editfile.go

@@ -0,0 +1,105 @@
+package ticket
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+// FormatEditDocument is the markdown representation used for external editing.
+// Format:
+//
+//	# Title
+//
+//	optional description body…
+func FormatEditDocument(t Ticket) string {
+	title := strings.TrimSpace(t.Title)
+	title = strings.TrimLeft(title, "#")
+	title = strings.TrimSpace(title)
+
+	var b strings.Builder
+	b.WriteString("# ")
+	b.WriteString(title)
+	b.WriteString("\n")
+	if desc := strings.TrimSpace(t.Description); desc != "" {
+		b.WriteString("\n")
+		b.WriteString(desc)
+		if !strings.HasSuffix(desc, "\n") {
+			b.WriteString("\n")
+		}
+	}
+	return b.String()
+}
+
+// ParseEditDocument extracts title and description from an edited markdown file.
+func ParseEditDocument(content string) (title, description string, err error) {
+	content = strings.ReplaceAll(content, "\r\n", "\n")
+	content = strings.TrimSpace(content)
+	if content == "" {
+		return "", "", fmt.Errorf("ticket content is empty")
+	}
+
+	lines := strings.Split(content, "\n")
+	first := strings.TrimSpace(lines[0])
+	if strings.HasPrefix(first, "#") {
+		title = strings.TrimSpace(strings.TrimLeft(first, "#"))
+		rest := strings.Join(lines[1:], "\n")
+		description = strings.TrimSpace(rest)
+	} else {
+		title = first
+		rest := strings.Join(lines[1:], "\n")
+		description = strings.TrimSpace(rest)
+	}
+	if title == "" {
+		return "", "", fmt.Errorf("ticket title is required")
+	}
+	return title, description, nil
+}
+
+// WriteEditFile writes the ticket to a temp .md file and returns its path.
+func WriteEditFile(t Ticket) (string, error) {
+	f, err := os.CreateTemp("", "task-master-ticket-*.md")
+	if err != nil {
+		return "", fmt.Errorf("create temp file: %w", err)
+	}
+	path := f.Name()
+	if _, err := f.WriteString(FormatEditDocument(t)); err != nil {
+		_ = f.Close()
+		_ = os.Remove(path)
+		return "", fmt.Errorf("write temp file: %w", err)
+	}
+	if err := f.Close(); err != nil {
+		_ = os.Remove(path)
+		return "", fmt.Errorf("close temp file: %w", err)
+	}
+	return path, nil
+}
+
+// ResolveEditor returns the user's preferred editor command string.
+// Order: $EDITOR → $VISUAL → nvim → vim → vi.
+func ResolveEditor() string {
+	if ed := strings.TrimSpace(os.Getenv("EDITOR")); ed != "" {
+		return ed
+	}
+	if ed := strings.TrimSpace(os.Getenv("VISUAL")); ed != "" {
+		return ed
+	}
+	for _, cand := range []string{"nvim", "vim", "vi"} {
+		if _, err := exec.LookPath(cand); err == nil {
+			return cand
+		}
+	}
+	return "vi"
+}
+
+// EditorCmd builds a command that opens path in the default terminal editor.
+// Supports multi-word EDITOR values like "code --wait".
+func EditorCmd(path string) *exec.Cmd {
+	ed := ResolveEditor()
+	cmd := exec.Command("sh", "-c", ed+` "$1"`, "--", path)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	return cmd
+}