Initial implementation of Claude Code hooks in Go

- Easy-to-use hook registration system
- Built-in hooks for bash validation, file protection, and logging
- Automatic goimports formatting for modified Go files
- CLI with install/uninstall commands
- Comprehensive documentation and examples

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/config/settings.go

@@ -0,0 +1,126 @@
+package config
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+type Settings struct {
+	Hooks []Hook `json:"hooks"`
+}
+
+type Hook struct {
+	Events   []string `json:"events"`
+	Matchers []string `json:"matchers"`
+	Cmds     []string `json:"cmds"`
+}
+
+func LoadSettings(path string) (*Settings, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return &Settings{}, nil
+		}
+		return nil, fmt.Errorf("failed to read settings: %w", err)
+	}
+
+	var settings Settings
+	if err := json.Unmarshal(data, &settings); err != nil {
+		return nil, fmt.Errorf("failed to parse settings: %w", err)
+	}
+
+	return &settings, nil
+}
+
+func SaveSettings(path string, settings *Settings) error {
+	dir := filepath.Dir(path)
+	if err := os.MkdirAll(dir, 0755); err != nil {
+		return fmt.Errorf("failed to create settings directory: %w", err)
+	}
+
+	data, err := json.MarshalIndent(settings, "", "  ")
+	if err != nil {
+		return fmt.Errorf("failed to marshal settings: %w", err)
+	}
+
+	if err := os.WriteFile(path, data, 0644); err != nil {
+		return fmt.Errorf("failed to write settings: %w", err)
+	}
+
+	return nil
+}
+
+func GetSettingsPath() string {
+	if path := os.Getenv("CLAUDE_SETTINGS_PATH"); path != "" {
+		return path
+	}
+	
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return ""
+	}
+	
+	return filepath.Join(home, ".claude", "settings.json")
+}
+
+func InstallHooks(binaryPath string) error {
+	settingsPath := GetSettingsPath()
+	settings, err := LoadSettings(settingsPath)
+	if err != nil {
+		return err
+	}
+
+	hookCmd := binaryPath + " run"
+	
+	allEvents := []string{
+		"pre_tool_use",
+		"post_tool_use", 
+		"user_prompt_submit",
+		"stop",
+		"subagent_stop",
+		"notification",
+		"pre_compact",
+	}
+
+	found := false
+	for i, hook := range settings.Hooks {
+		if len(hook.Cmds) > 0 && hook.Cmds[0] == hookCmd {
+			settings.Hooks[i].Events = allEvents
+			settings.Hooks[i].Matchers = []string{".*"}
+			found = true
+			break
+		}
+	}
+
+	if !found {
+		settings.Hooks = append(settings.Hooks, Hook{
+			Events:   allEvents,
+			Matchers: []string{".*"},
+			Cmds:     []string{hookCmd},
+		})
+	}
+
+	return SaveSettings(settingsPath, settings)
+}
+
+func UninstallHooks(binaryPath string) error {
+	settingsPath := GetSettingsPath()
+	settings, err := LoadSettings(settingsPath)
+	if err != nil {
+		return err
+	}
+
+	hookCmd := binaryPath + " run"
+	filtered := make([]Hook, 0)
+	
+	for _, hook := range settings.Hooks {
+		if len(hook.Cmds) == 0 || hook.Cmds[0] != hookCmd {
+			filtered = append(filtered, hook)
+		}
+	}
+
+	settings.Hooks = filtered
+	return SaveSettings(settingsPath, settings)
+}