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75 lines
1.9 KiB
Makefile
75 lines
1.9 KiB
Makefile
# Helpers for self-documenting makefiles.
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# Based on http://www.cmcrossroads.com/print/article/self-documenting-makefiles
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#
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# Standard usage:
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#
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# TARGET: PREREQUISITES $(call def-help,TARGET,HELP)
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# ACTIONS
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#
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# or on multiple lines:
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#
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# TARGET: PREREQUISITES \
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# $(call def-help,TARGET,\
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# HELP\
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# )
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# ACTIONS
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#
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# Also:
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#
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# $(call def-help-heading,TITLE,HELP) -- show a section heading
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#
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# $(call def-help-subheading,TITLE,HELP) -- show a subsection heading
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#
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# $(call def-help-hide,TARGET,HELP) -- temporarily suppress the help)
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# $(call def-help-heading-hide,TITLE,HELP)
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# $(call def-help-subheading-hide,TITLE,HELP)
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#
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# HELP is one or more lines, or can be blank.
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# Certain characters are not allowed, comma in particular.
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# You may want to avoid ' also as it breaks emacs font-lock.
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# if the make targets include "help" or there are no targets, show help
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need-help := $(if $(MAKECMDGOALS),$(filter help,$(MAKECMDGOALS)),true)
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help:
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@echo $(if $(need-help),,Type \'make$(dash-f) help\' to get help)
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# show a make target's help when help has been requested
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define def-help
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$(if $(need-help), $(warning make $1 --$2))
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endef
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# show a section heading when help has been requested
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define def-help-heading
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$(if $(need-help),$(warning $1))
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endef
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# show a subsection heading when help has been requested
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define def-help-subheading
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$(if $(need-help),$(warning );$(warning $1))
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endef
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# no-ops, for hiding help without removing it entirely
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define def-help-hide
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endef
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define def-help-heading-hide
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endef
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define def-help-subheading-hide
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endef
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# utilities
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# define print-lines
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# @echo $1
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# endef
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# $(if $(true),$(printf $1),$(printf '\n'$1))
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define last-element
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$(word $(words $1),$1)
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endef
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this-makefile := $(call last-element,$(MAKEFILE_LIST))
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other-makefiles := $(filter-out $(this-makefile),$(MAKEFILE_LIST))
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parent-makefile := $(call last-element,$(other-makefiles))
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dash-f := $(if $(filter-out Makefile makefile GNUmakefile, $(parent-makefile)), -f $(parent-makefile))
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