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/config/loader.go

@@ -0,0 +1,90 @@
+package config
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// LoadOrCreate loads the config from disk, creating defaults if missing.
+// It also ensures DataDir and the active project directory exist.
+func LoadOrCreate() (*Config, error) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return nil, fmt.Errorf("resolve home directory: %w", err)
+	}
+
+	cfgPath := Path(home)
+	cfgDir := filepath.Dir(cfgPath)
+	if err := os.MkdirAll(cfgDir, 0o755); err != nil {
+		return nil, fmt.Errorf("create config dir %s: %w", cfgDir, err)
+	}
+
+	cfg, err := readOrCreate(cfgPath, home)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := ensureDataDirs(cfg); err != nil {
+		return nil, err
+	}
+
+	return cfg, nil
+}
+
+func readOrCreate(cfgPath, home string) (*Config, error) {
+	data, err := os.ReadFile(cfgPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			cfg := Defaults(home)
+			if err := Save(&cfg); err != nil {
+				return nil, fmt.Errorf("write default config: %w", err)
+			}
+			return &cfg, nil
+		}
+		return nil, fmt.Errorf("read config %s: %w", cfgPath, err)
+	}
+
+	var cfg Config
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		return nil, fmt.Errorf("parse config %s: %w", cfgPath, err)
+	}
+	cfg.ApplyDefaults(home)
+	return &cfg, nil
+}
+
+// Save writes the config to ~/.config/task-master/config.json.
+func Save(cfg *Config) error {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return fmt.Errorf("resolve home directory: %w", err)
+	}
+
+	cfgPath := Path(home)
+	if err := os.MkdirAll(filepath.Dir(cfgPath), 0o755); err != nil {
+		return fmt.Errorf("create config dir: %w", err)
+	}
+
+	data, err := json.MarshalIndent(cfg, "", "  ")
+	if err != nil {
+		return fmt.Errorf("marshal config: %w", err)
+	}
+	data = append(data, '\n')
+
+	if err := os.WriteFile(cfgPath, data, 0o644); err != nil {
+		return fmt.Errorf("write config %s: %w", cfgPath, err)
+	}
+	return nil
+}
+
+func ensureDataDirs(cfg *Config) error {
+	if err := os.MkdirAll(cfg.DataDir, 0o755); err != nil {
+		return fmt.Errorf("create data dir %s: %w", cfg.DataDir, err)
+	}
+	projectDir := filepath.Join(cfg.DataDir, "projects", cfg.ActiveProject)
+	if err := os.MkdirAll(projectDir, 0o755); err != nil {
+		return fmt.Errorf("create project dir %s: %w", projectDir, err)
+	}
+	return nil
+}