feat: add support for excluding the top level directory (#967)

.github/workflows/test.yml

@@ -446,6 +446,28 @@ jobs:
           exit 1
         shell:
           bash
+      - name: Run changed-files with dir_names and dir_names_exclude_root
+        id: changed-files-dir-names-exclude-root
+        uses: ./
+        with:
+          base_sha: dddfbd69
+          sha: ce8c1983
+          fetch_depth: 60000
+          dir_names: "true"
+          dir_names_exclude_root: "true"
+          dir_names_max_depth: "1"
+      - name: Show output
+        run: |
+          echo '${{ toJSON(steps.changed-files-dir-names-exclude-root.outputs) }}'
+        shell:
+          bash
+      - name: Check dir_names output
+        if: steps.changed-files-dir-names-exclude-root.outputs.all_changed_files != '.github'
+        run: |
+          echo "Invalid output: Expected (.github) got (${{ steps.changed-files-dir-names-exclude-root.outputs.all_changed_files }})"
+          exit 1
+        shell:
+          bash
       - name: Run changed-files with dir_names
         id: changed-files-dir-names
         uses: ./

action.yml

@@ -75,6 +75,10 @@ inputs:
   dir_names_max_depth:
     description: "Maximum depth of directories to output. e.g `test/test1/test2` with max depth of `2` returns `test/test1`."
     required: false
+  dir_names_exclude_root:
+    description: "Exclude the root directory represented by `.` from the output when `dir_names`is set to `true`."
+    required: false
+    default: "false"
   json:
     description: "Output list of changed files in a JSON formatted string which can be used for matrix jobs."
     required: false
@@ -245,6 +249,7 @@ runs:
         INPUT_DIFF_RELATIVE: ${{ inputs.diff_relative }}
         INPUT_DIR_NAMES: ${{ inputs.dir_names }}
         INPUT_DIR_NAMES_MAX_DEPTH: ${{ inputs.dir_names_max_depth }}
+        INPUT_DIR_NAMES_EXCLUDE_ROOT: ${{ inputs.dir_names_exclude_root }}
         INPUT_JSON: ${{ inputs.json }}
         INPUT_HAS_CUSTOM_PATTERNS: ${{ steps.glob.outputs.has-custom-patterns }}
         INPUT_JSON_RAW_FORMAT: ${{ inputs.json_raw_format }}

get-changed-paths.sh

@@ -47,6 +47,10 @@ function get_dirname_max_depth() {
       depth=$((depth + 1))
     done
 
+    if [[ "$INPUT_DIR_NAMES_EXCLUDE_ROOT" == "true" && "$output" == "." ]]; then
+      continue
+    fi
+
     echo "$output"
   done < <(uniq)
 }