From 3920d09706ca3a880d41d9e8d4fe53b971d3c748 Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fischer@muhq.space>
Date: Tue, 28 Dec 2021 12:45:07 +0100
Subject: make: implement check-format in POSIX shell

The docker image used for the CI does not contain bash.
---
 Makefile           | 7 ++-----
 tools/check-format | 8 ++++++++
 2 files changed, 10 insertions(+), 5 deletions(-)
 create mode 100755 tools/check-format

diff --git a/Makefile b/Makefile
index cdf9647..7d505d4 100644
--- a/Makefile
+++ b/Makefile
@@ -4,19 +4,16 @@ LUA_FILES := $(shell find -name "*.lua" -not -path "./json.lua")
 
 TEST_FILES := $(shell find -name "*_test.lua")
 
-# bash's process substitution is used for check-format
-SHELL := /bin/bash
-
 check: check-luacheck check-format
 
 check-luacheck:
 	luacheck --globals=vis -- $(LUA_FILES)
 
 check-format:
-	for lf in $(LUA_FILES); do diff $$lf <(lua-format $$lf) >/dev/null; done
+	for lf in $(LUA_FILES); do tools/check-format "$${lf}"; done
 
 format:
 	lua-format -i $(LUA_FILES)
 
 test:
-	for tf in $(TEST_FILES); do $$tf; done
+	for tf in $(TEST_FILES); do "$$tf"; done
diff --git a/tools/check-format b/tools/check-format
new file mode 100755
index 0000000..392d023
--- /dev/null
+++ b/tools/check-format
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+LUA_FILE=$1
+lua-format "${LUA_FILE}" > "${LUA_FILE}.fmt"
+diff "${LUA_FILE}" "${LUA_FILE}.fmt"
+RET=$?
+rm "${LUA_FILE}.fmt"
+exit ${RET}
-- 
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