Initial commit

pkg/hooks/response.go

@@ -0,0 +1,51 @@
+// Package hooks provides hook utilities for claude-mnemonic.
+package hooks
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// HookResponse is the response sent back to Claude Code.
+type HookResponse struct {
+	Continue bool `json:"continue"`
+}
+
+// ProjectIDWithName returns both the hash ID and the directory name for display.
+// Format: "dirname_abc123" (name + truncated hash for human-readability)
+func ProjectIDWithName(cwd string) string {
+	absPath, err := filepath.Abs(cwd)
+	if err != nil {
+		absPath = cwd
+	}
+
+	dirName := filepath.Base(absPath)
+	hash := sha256.Sum256([]byte(absPath))
+	shortHash := hex.EncodeToString(hash[:3]) // 6 chars
+
+	return fmt.Sprintf("%s_%s", dirName, shortHash)
+}
+
+// Exit codes for Claude Code hooks
+const (
+	ExitSuccess         = 0
+	ExitFailure         = 1
+	ExitUserMessageOnly = 3 // Display stderr as user message
+)
+
+// WriteResponse writes a hook response to stdout.
+func WriteResponse(hookName string, success bool) {
+	response := HookResponse{Continue: success}
+	data, _ := json.Marshal(response)
+	fmt.Println(string(data))
+}
+
+// WriteError writes an error message to stderr and exits.
+func WriteError(hookName string, err error) {
+	fmt.Fprintf(os.Stderr, "[%s] Error: %v\n", hookName, err)
+	WriteResponse(hookName, false)
+}