From 28c1364820e3758c3af45e5d8b0d75f7b8cf60a3 Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fischer@muhq.space>
Date: Sun, 7 May 2023 17:28:03 +0200
Subject: support special subdir Makefiles

* dynamically find the location of common.mk
* specify MAKEFILE_DIR in common.mk if not already defined
---
 Info/10/Makefile | 4 ++--
 common.mk        | 5 +++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/Info/10/Makefile b/Info/10/Makefile
index af11d41e..9a8c4823 100644
--- a/Info/10/Makefile
+++ b/Info/10/Makefile
@@ -1,8 +1,8 @@
-include ../../common.mk
+COMMON_MK = $(shell bash -c 'upfind() { [[ -f "$$1" ]] && printf "$$1" || ([ "$$(realpath $$(dirname "$$1"))" == "/" ] || upfind "../$$1") }; upfind common.mk')
+include $(COMMON_MK)
 
 java_cheatsheet.pdf: java_cheatsheet.tex
 	rubber --pdf $< && rubber --clean -q $<
 
 java_cheatsheet.tex: java_cheatsheet.md | Makefile
 	pandoc $< -o $@ --standalone && sed -i '/[^,]\\\\$$/a \\\\midrule' $@
-
diff --git a/common.mk b/common.mk
index cae111b7..dceb5997 100644
--- a/common.mk
+++ b/common.mk
@@ -1,3 +1,8 @@
+# The full path to the Makefile
+MAKEFILE_PATH ?= $(abspath $(lastword $(MAKEFILE_LIST)))
+# The path to the directory of the Makefile
+MAKEFILE_DIR ?= $(dir $(MAKEFILE_PATH))
+
 IMGS := $(wildcard img/*)
 
 LATEX_BASE := $(MAKEFILE_DIR)latex
-- 
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