build(make): moved make helpers to a separate file (#27)

* build(ci): fixed build error if no changes in formulas
* build(make): moved make helpers to a separate file

.github/workflows/tests.yml

@@ -39,4 +39,4 @@ jobs:
         with:
           name: bottles_${{ matrix.os }}
           path: '*.bottle.*'
-          if-no-files-found: error
+          if-no-files-found: warn

Makefile

@@ -1,18 +1,15 @@
-
-## Print help
-help:
-	@echo "$$(tput setaf 2)Usage$$(tput sgr0)";sed -ne"/^## /{h;s/.*//;:d" -e"H;n;s/^## /---/;td" -e"s/:.*//;G;s/\\n## /===/;s/\\n//g;p;}" ${MAKEFILE_LIST}|awk -F === -v n=$$(tput cols) -v i=4 -v a="$$(tput setaf 6)" -v z="$$(tput sgr0)" '{printf"  '$$(tput setaf 2)make$$(tput sgr0)' %s%s%s\t",a,$$1,z;m=split($$2,w,"---");l=n-i;for(j=1;j<=m;j++){l-=length(w[j])+1;if(l<= 0){l=n-i-length(w[j])-1;}printf"%*s%s\n",-i," ",w[j];}}' | column -ts $$'\t'
-.PHONY: help
+# Common makefile helpers
+include build/make/common.mk
 
 # Variables
 tapctl := bin/tapctl.py $(if $(verbose),--verbose)
 
 ## Synchronize formulas
+.PHONY: sync
 sync:
 	@$(tapctl) sync
-.PHONY: sync
 
 ## Synchronize formulas with force
+.PHONY: sync-force
 sync-force:
 	@$(tapctl) sync --force
-.PHONY: sync-force

build/make/common.mk

@@ -0,0 +1,12 @@
+## Print help
+.PHONY: help
+help:
+	@ echo "$$(tput setaf 2)Usage$$(tput sgr0)"
+	@ sed -E '/^\.[a-z_]+:/Id' \
+		${MAKEFILE_LIST} \
+	| sed -n \
+		-e '/^## /{h;s/.*//;:d' \
+		-e 'H;n;s/^## /\t/;td' \
+		-e 's/:.*//;G;s/\n## /\t/;s/\n//g;p;}' \
+	| sed -E 's/^(.+)\t/  $(shell tput setaf 2)make$(shell tput sgr0) $(shell tput setaf 6)\1$(shell tput sgr0)\t/' \
+	| column -ts $$'\t'