Add clang-format-18 support and version output

.github/workflows/entrypoint-test.yml

@@ -16,7 +16,7 @@ jobs:
   test-entrypoint:
     runs-on: ubuntu-latest
     container:
-      image: silkeh/clang:21
+      image: silkeh/clang:18
     steps:
     - uses: actions/checkout@v5
     - name: Basic command works
@@ -36,4 +36,8 @@ jobs:
           echo "file2.c should not be checked"
           exit 9
         fi
+        if ! grep -q "clang-format version:" output; then
+          echo "Version should be displayed in output"
+          exit 10
+        fi
         echo "Basic command works"

Dockerfile

@@ -1,4 +1,4 @@
-FROM silkeh/clang:21
+FROM silkeh/clang:18
 
 LABEL maintainer="RafikFarhad<rafikfarhad@gmail.com>"
 

ReadMe.md

@@ -34,6 +34,21 @@ The style for `clang-format`. Possible values are: `LLVM, GNU, Google, Chromium,
 
 Default: `LLVM`
 
+## Outputs
+
+### `clang-format-version`
+The version of clang-format used by this action. This can be useful when you need to verify which version ran or use it in subsequent workflow steps.
+
+Example usage:
+```yaml
+- uses: RafikFarhad/clang-format-github-action@v6
+  id: clang-format
+  with:
+    sources: "src/**/*.h,src/**/*.c"
+
+- run: echo "Formatted with clang-format version ${{ steps.clang-format.outputs.clang-format-version }}"
+```
+
 ## Sample Workflow File
 Create a file in `.github/workflows/` folder with:
 
@@ -61,6 +76,7 @@ Use older versions for specific `clang-format` versions.
 |---------|---------------|
 | 21 | RafikFarhad/clang-format-github-action@v6 |
 | 19 | RafikFarhad/clang-format-github-action@v5 |
+| 18 | RafikFarhad/clang-format-github-action@v4.1 |
 | 16 | RafikFarhad/clang-format-github-action@v4 |
 | 14 | RafikFarhad/clang-format-github-action@v3 |
 | 12 | RafikFarhad/clang-format-github-action@v2.1.0 |

action.yml

@@ -21,6 +21,9 @@ inputs:
       Paths to exclude separated by comma (`,`)
     required: false
     default: ""
+outputs:
+  clang-format-version:
+    description: The version of clang-format used by this action
 runs:
   using: docker
   image: Dockerfile

entrypoint.sh

@@ -66,6 +66,9 @@ function find_cmd() {
 
 function main() {
     log "Action started"
+    CLANG_FORMAT_VERSION=$(clang-format --version | head -n 1)
+    log "clang-format version: $CLANG_FORMAT_VERSION"
+    echo "clang-format-version=$CLANG_FORMAT_VERSION" >> "$GITHUB_OUTPUT"
     resolve_inputs
     log "Sources to check: $INPUT_SOURCES"
     if [ -n "$INPUT_EXCLUDES" ]; then