Use a variable for source file extension in Makefiles

Reduce duplication when maintaining each AoC year's Makefile.
ericvw · Jan 9, 2024 · e13c62c · e13c62c
1 parent be4e279
commit e13c62c
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Showing 2 changed files with 8 additions and 6 deletions.
diff --git a/2021/Makefile b/2021/Makefile
@@ -11,12 +11,13 @@ black := $(PYTHON) -m black
 mypy := $(PYTHON) -m mypy
 ruff := $(PYTHON) -m ruff
 
-srcs := $(wildcard *.py)
-answers := $(subst puzzle,answer,$(srcs:.py=.txt))
+ext := .py
+srcs := $(wildcard puzzle_*$(ext))
+answers := $(subst puzzle,answer,$(srcs:$(ext)=.txt))
 
 include $(CURDIR)/../mk-common/common.mk
 
-answer_%.txt: puzzle_%.py input_%.txt
+answer_%.txt: puzzle_%$(ext) input_%.txt
 	$(PYTHON) ./$< < $(filter-out $<, $^) | tee $@
 
 .PHONY: lint

diff --git a/2022/Makefile b/2022/Makefile
@@ -7,16 +7,17 @@ SHELL := bash
 
 NIM ?= nim
 
-srcs := $(wildcard puzzle_*.nim)
-answers := $(subst puzzle,answer,$(srcs:.nim=.txt))
+ext := .nim
+srcs := $(wildcard puzzle_*$(ext))
+answers := $(subst puzzle,answer,$(srcs:$(ext)=.txt))
 
 include $(CURDIR)/../mk-common/common.mk
 
 answer_%.txt: puzzle_% input_%.txt
 	./$< < $(filter-out $<, $^) | tee $@
 
 .NOTINTERMEDIATE: puzzle_%
-puzzle_%: puzzle_%.nim nim.cfg
+puzzle_%: puzzle_%$(ext) nim.cfg
 	$(NIM) c $<
 
 .PHONY: format