Add formatting check to continuous integration

.github/workflows/check-format.yml

@@ -0,0 +1,24 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  repository_dispatch:
+    types: [run_build]
+
+jobs:
+  check-format:
+    runs-on: ubuntu-latest
+    container: ps2dev/ps2dev:latest
+    steps:
+    - name: Install dependencies
+      run: |
+        apk add git make clang
+
+    - uses: actions/checkout@v2
+    - run: |
+        git fetch --prune --unshallow
+
+    - name: Check format -> make format-check
+      run: |
+        make format-check

Makefile

@@ -188,7 +188,7 @@ EE_OBJS := $(EE_OBJS:%=$(EE_OBJS_DIR)%)
 
 .SILENT:
 
-.PHONY: all release debug iopcore_debug eesio_debug ingame_debug deci2_debug clean rebuild pc_tools pc_tools_win32 oplversion format
+.PHONY: all release debug iopcore_debug eesio_debug ingame_debug deci2_debug clean rebuild pc_tools pc_tools_win32 oplversion format format-check
 
 all:
 	echo "Building Open PS2 Loader $(OPL_VERSION)..."
@@ -315,6 +315,9 @@ pc_tools_win32:
 format:
 	find . -type f -not -path \*modules/network/SMSTCPIP\* -a \( -iname \*.h -o -iname \*.c \) | xargs clang-format -i
 
+format-check:
+	@! find . -type f -not -path \*modules/network/SMSTCPIP\* -a \( -iname \*.h -o -iname \*.c \) | xargs clang-format -style=file -output-replacements-xml | grep "<replacement " >/dev/null
+
 $(EE_ASM_DIR):
 	@mkdir -p $@