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ALL_DIRS := $(shell find -name "text.xml" -exec dirname {} +)
text_files := $(addsuffix /index.html,$(ALL_DIRS))
image_files := $(shell find -name "*.svg" | sed -e "s/svg$$/png/")
all: prereq $(text_files) $(image_files)
prereq:
@type -p convert &>/dev/null || { echo "media-gfx/imagemagick with corefonts, svg and truetype required" >&2; exit 1; }; \
type -p xsltproc &>/dev/null || { echo "dev-libs/libxslt is required" >&2; exit 1; }
%.png : %.svg
convert $< $@
clean:
@find . -name "*.png" -a \! -path "./icons/*" -exec rm -v {} +
@find . -name "index.html" -exec rm -v {} +
# Given a directory with text.xml in it, return its immediate children as prerequisites
# Hypothetical example:
# INPUT: "./archs" "./archs/amd64 ./archs/x86 ./ebuild-writing ./appendices"
# OUTPUT: ./archs/amd64/index.html ./archs/amd64/index.html
define get_prerequisites =
$(addsuffix /index.html,$(foreach subdir,$(2),$(if $(subst $(1)/,,$(dir $(subdir))),,$(subdir))))
endef
# Given a directory with text.xml in it, genereate a complete build rule with prerequisites
# Hypothetical example:
# INPUT: "./archs" "./archs/amd64 ./archs/x86 ./ebuild-writing ./appendices"
# OUTPUT ./archs/index.html: ./archs/text.xml devbook.xsl ./archs/amd64/index.html ./archs/x86/index.html
# xsltproc devbook.xsl ./archs/text.xml > ./archs/index.html
define generate_rule =
$(1)/index.html: $(1)/text.xml devbook.xsl $(call get_prerequisites,$(1),$(2))
xsltproc devbook.xsl $$< > $$@
endef
# This generates individual build rules for all the text files by
# iterating over all the directories in the file system tree
$(foreach dir,$(ALL_DIRS),$(eval $(call generate_rule,$(dir),$(filter-out $(dir),$(ALL_DIRS)))))
.PHONY: all prereq clean
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