Add code format check as GitHub workflow.

.github/format_check_diff.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+[[ ! $(git --version) ]] && exit 1
+
+output=$(git diff)
+
+if [[ "$output" != "" ]]; then
+  echo "One or more source files are not formatted!"
+  exit 1
+fi
+
+echo "All source files are formatted"
+exit

.github/workflows/format-check.yml

@@ -0,0 +1,11 @@
+name: format-check
+on: [push]
+jobs:
+  format-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: format code
+        run: ./tools/format_code.sh
+      - name: check diff
+        run: ./.github/format_check_diff.sh

tools/format_code.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+[[ ! $(clang-format --version) ]] && exit 1
+
+script_path=${0%/*}
+project_root=${script_path%/*}
+
+if [[ "$0" != "$project_root" ]] && [[ "$project_root" != "" ]]; then
+  cd "$project_root" || exit 1
+  echo "-- Changed pwd to $(pwd)"
+fi
+
+files=$(find DogTales -name "*.?pp")
+if [[ "$files" == "" ]]; then
+  echo "-- No source files found"
+  exit
+fi
+
+clang-format -i $files
+echo -e "-- Formatted Files:\n$files\n"
+
+exit