feat: update CONTENT_UNCHANGED logic

Author: xiaoyu2er

.github/workflows/update-en-docs.yml

@@ -102,14 +102,22 @@ jobs:
                 SOURCE=$(echo "$LINE" | awk '{print $1}')
                 DEST=$(echo "$LINE" | awk '{print $2}')
                 
-                # Check if there are actual content changes using git diff
-                # --numstat gives us numeric stats: added lines, removed lines, filename
-                # If the file was only renamed with no content changes, it will show 0 0
-                GIT_DIFF=$(git diff --cached --numstat "$SOURCE" "$DEST")
-                ADDED_LINES=$(echo "$GIT_DIFF" | awk '{print $1}')
-                REMOVED_LINES=$(echo "$GIT_DIFF" | awk '{print $2}')
+                # Check if there are actual content changes using git diff with -M (detect renames)
+                # If there's output from the diff command beyond the rename header, there are content changes
+                DIFF_OUTPUT=$(git diff --cached -M -- "$SOURCE" "$DEST")
+                # Count lines that start with +/- (changes) but ignore the rename header lines
+                CHANGE_COUNT=$(echo "$DIFF_OUTPUT" | grep -v "^renamed:" | grep -v "^─" | grep -E "^\+|^-" | wc -l)
                 
-                echo "Git diff for $SOURCE → $DEST: $ADDED_LINES lines added, $REMOVED_LINES lines removed"
+                echo "Git diff for $SOURCE → $DEST: $CHANGE_COUNT lines changed"
+                
+                # Determine if this is just a rename or if content was also changed
+                if [ "$CHANGE_COUNT" -eq 0 ]; then
+                  CONTENT_UNCHANGED=true
+                  echo "Pure rename detected (no content changes)"
+                else
+                  CONTENT_UNCHANGED=false
+                  echo "Content changes detected along with rename"
+                fi
                 
                 # Replace 'en' with current locale in paths
                 SOURCE_LOCALE=${SOURCE/content\/en/content\/$LOCALE}
@@ -126,8 +134,7 @@ jobs:
                   
                   # If the content is identical (just a rename, not a modification)
                   # then update the timestamps in the translation file
-                  # Git diff showing 0 added and 0 removed lines means identical content
-                  if [ "$ADDED_LINES" = "0" ] && [ "$REMOVED_LINES" = "0" ]; then
+                  if [ "$CONTENT_UNCHANGED" = "true" ]; then
                     echo "Content unchanged, updating timestamps in $DEST_LOCALE"
                     
                     # Update source-updated-at and translation-updated-at in the file