Refactor rename logic into reusable function

Extract duplicate rename code from --rename option and interactive 'r' branch into find_unique_filename() function. Reduces code duplication and improves maintainability.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

skills/minio-upload/scripts/upload_to_obsidian.sh

@@ -95,6 +95,36 @@ fi
 # Get filename
 FILENAME=$(basename "$FILE_PATH")
 
+# Function to find unique filename by adding numeric suffix
+# Sets global variables: TARGET_PATH, FILENAME
+find_unique_filename() {
+    local original_filename="$1"
+    local subpath="$2"
+    local counter=1
+    local base_name="${original_filename%.*}"
+    local ext="${original_filename##*.}"
+
+    # Handle files without extension
+    if [ "$base_name" = "$ext" ]; then
+        base_name="$original_filename"
+        ext=""
+    else
+        ext=".$ext"
+    fi
+
+    while true; do
+        local new_name="${base_name}-${counter}${ext}"
+        local new_target="minio/obsidian/${subpath}/${new_name}"
+        if ! mc stat "$new_target" >/dev/null 2>&1; then
+            TARGET_PATH="$new_target"
+            FILENAME="$new_name"
+            echo "📝 Renamed to: $FILENAME"
+            return 0
+        fi
+        counter=$((counter + 1))
+    done
+}
+
 # Construct target path
 TARGET_PATH="minio/obsidian/${SUBPATH}/${FILENAME}"
 
@@ -116,29 +146,7 @@ if mc stat "$TARGET_PATH" >/dev/null 2>&1; then
         mc cp "$TARGET_PATH" "$BACKUP_PATH"
     # User explicitly specified --rename
     elif [ "$RENAME" = true ]; then
-        COUNTER=1
-        BASE_NAME="${FILENAME%.*}"
-        EXT="${FILENAME##*.}"
-
-        if [ "$BASE_NAME" = "$EXT" ]; then
-            # No extension
-            BASE_NAME="$FILENAME"
-            EXT=""
-        else
-            EXT=".$EXT"
-        fi
-
-        while true; do
-            NEW_NAME="${BASE_NAME}-${COUNTER}${EXT}"
-            NEW_TARGET="minio/obsidian/${SUBPATH}/${NEW_NAME}"
-            if ! mc stat "$NEW_TARGET" >/dev/null 2>&1; then
-                TARGET_PATH="$NEW_TARGET"
-                FILENAME="$NEW_NAME"
-                echo "📝 Renamed to: $FILENAME"
-                break
-            fi
-            COUNTER=$((COUNTER + 1))
-        done
+        find_unique_filename "$FILENAME" "$SUBPATH"
     # User explicitly specified --force
     elif [ "$FORCE" = true ]; then
         echo "⚠️  Overwriting existing file: $TARGET_PATH"
@@ -173,28 +181,8 @@ if mc stat "$TARGET_PATH" >/dev/null 2>&1; then
                     break
                     ;;
                 r|R|rename)
-                    COUNTER=1
-                    BASE_NAME="${FILENAME%.*}"
-                    EXT="${FILENAME##*.}"
-
-                    if [ "$BASE_NAME" = "$EXT" ]; then
-                        BASE_NAME="$FILENAME"
-                        EXT=""
-                    else
-                        EXT=".$EXT"
-                    fi
-
-                    while true; do
-                        NEW_NAME="${BASE_NAME}-${COUNTER}${EXT}"
-                        NEW_TARGET="minio/obsidian/${SUBPATH}/${NEW_NAME}"
-                        if ! mc stat "$NEW_TARGET" >/dev/null 2>&1; then
-                            TARGET_PATH="$NEW_TARGET"
-                            FILENAME="$NEW_NAME"
-                            echo "📝 Renamed to: $FILENAME"
-                            break 2
-                        fi
-                        COUNTER=$((COUNTER + 1))
-                    done
+                    find_unique_filename "$FILENAME" "$SUBPATH"
+                    break
                     ;;
                 *)
                     echo "Invalid choice. Please enter o, s, b, or r"