add timestamp to dirmd files

internal/renderer/renderer.go

@@ -6,6 +6,7 @@ import (
 	"path/filepath"
 	"sort"
 	"strings"
+	"time"
 	"unicode/utf8"
 
 	"git.flo.fo/FLO/dirmd/internal/tree"
@@ -35,7 +36,12 @@ func Write(result *walker.Result, outputPath string, appendMode bool, singleFile
 		h1Path = filepath.Join(result.AbsRoot, result.Entries[0].RelPath)
 	}
 
-	fmt.Fprintf(&sb, "# %s [ROOT]\n\n", h1Path)
+	fmt.Fprintf(&sb, "# %s [ROOT]\n", h1Path)
+
+	// Add timestamp only if creating a new file (not append mode)
+	if !appendMode {
+		fmt.Fprintf(&sb, "> Generated: %s\n\n", time.Now().Format(time.RFC3339))
+	}
 
 	if !singleFile {
 		root := tree.Build(result.Entries)
@@ -162,7 +168,9 @@ func writeRootSlice(path, absRoot, rootName, repoName string, rootFiles []walker
 
 	var sb strings.Builder
 
-	fmt.Fprintf(&sb, "# %s [ROOT]\n\n", absRoot)
+	fmt.Fprintf(&sb, "# %s [ROOT]\n", absRoot)
+	// Timestamp for new file creation
+	fmt.Fprintf(&sb, "> Generated: %s\n\n", time.Now().Format(time.RFC3339))
 
 	treeLines := buildTreeWithRefs(rootName, repoName, topLevelDirs, rootFiles)
 	sb.WriteString("## Directory Tree\n\n")
@@ -239,7 +247,9 @@ func writeDirSlice(path, absDir, absRoot, dirName string, treeEntries, fileEntri
 
 	var sb strings.Builder
 
-	fmt.Fprintf(&sb, "# %s [SLICE]\n\n", absDir)
+	fmt.Fprintf(&sb, "# %s [SLICE]\n", absDir)
+	// Timestamp for new file creation
+	fmt.Fprintf(&sb, "> Generated: %s\n\n", time.Now().Format(time.RFC3339))
 	fmt.Fprintf(&sb, "Root document: %s\n\n", rootFileName)
 
 	sb.WriteString("## Directory Tree\n\n")