Add: [Action] allow this repository also to be used as GitHub Action (#…

…16)

action.yml

@@ -0,0 +1,12 @@
+name: 'OpenTTD Commit Checker'
+author: 'OpenTTD Dev Team'
+description: 'Checker for commits done to OpenTTD projects'
+inputs: {}
+runs:
+  using: 'composite'
+  steps:
+  - run: ${{ github.action_path }}/action/entrypoint.sh ${{ github.action_path }}
+    shell: bash
+branding:
+  icon: 'code'
+  color: 'blue'

action/entrypoint.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+set -ex
+
+HOOKS_DIR=$1
+
+# Install matchers.
+echo "::add-matcher::${HOOKS_DIR}/action/check-diff-matcher.json"
+echo "::add-matcher::${HOOKS_DIR}/action/check-message-matcher.json"
+
+# Show what commits we are evaluating.
+git log --oneline HEAD^..HEAD^2
+
+# Run the checker.
+HOOKS_DIR=${HOOKS_DIR}/hooks GIT_DIR=.git ${HOOKS_DIR}/hooks/check-commits.sh HEAD^..HEAD^2
+
+# Remove matchers.
+echo "::remove-matcher owner=check-diff::"
+echo "::remove-matcher owner=check-message::"

hooks/check-commits.sh

@@ -24,11 +24,6 @@ finish() {
 }
 trap finish EXIT
 
-if [ ${GITHUB_ACTIONS} ]; then
-	echo "::add-matcher::${HOOKS_DIR}/check-diff-matcher.json"
-	echo "::add-matcher::${HOOKS_DIR}/check-message-matcher.json"
-fi
-
 hashes=$(git rev-list "$1")
 for h in ${hashes}
 do
@@ -39,9 +34,4 @@ do
 	${HOOKS_DIR}/check-message.py ${tmp_msg_file} server || failure=1
 done
 
-if [ ${GITHUB_ACTIONS} ]; then
-	echo "::remove-matcher owner=check-diff::"
-	echo "::remove-matcher owner=check-message::"
-fi
-
 return ${failure}