Makefile

## Optional Makefile: only used for testing & maintainer automation;
##                    not used to build live site

S=@  ## Silent: only print errors by default; 
     ## run `make S='' [other args]` to print commands as they're run

## Old versions of jekyll must not call "build".  If you have one of
## these versions, either run make like this: make JEKYLL_COMMAND=jekyll
## or create the JEKYLL_COMMAND environmental variable:
# echo 'export JEKYLL_COMMAND=jekyll' >> ~/.bashrc
# exec bash
# make
JEKYLL_COMMAND ?= "bundle exec jekyll build"
SITEDIR=_site
JEKYLL_LOG=._jekyll.log

#######################
## REGULAR ARGUMENTS ##
#######################

## `make` (no arguments): just build
default: build

## `make test`: don't build, but do run all tests
test: pre-build-tests post-build-tests

## `make valid`: build and run fast tests
valid: pre-build-tests-fast build post-build-tests-fast

## `make all`: build and run all tests
all: pre-build-tests build post-build-tests



## Pre-build tests which, aggregated together, take less than 5 seconds to run on a typical PC
pre-build-tests-fast: check-for-non-ascii-urls

## Post-build tests which, aggregated together, take less than 5 seconds to run on a typical PC
post-build-tests-fast: check-for-build-errors ensure-each-svg-has-a-png check-for-liquid-errors \
    check-for-missing-anchors check-for-broken-markdown-reference-links

## All pre-build tests, including those which might take multiple minutes
pre-build-tests: pre-build-tests-fast
	@ true

## All post-build tests, including those which might take multiple minutes
post-build-tests: post-build-tests-fast
	@ true ## SOMEDAY: use linkchecker to find broken links 
	@      ## after this bug is fixed: https://github.com/wummel/linkchecker/issues/513





#################
## SUB-TARGETS ##
#################
ERROR_ON_OUTPUT="sed '1s/^/ERROR:\n/' | if grep . ; then sed 1iERROR ; false ; else true ; fi"

## Always build using the default locale so log messages can be grepped.
## This should not affect webpage output.
build:
	$S export LANG=C.UTF-8 ; eval $(JEKYLL_COMMAND) 2>&1 | tee $(JEKYLL_LOG)


## Jekyll annoyingly returns success even when it emits errors and
## exceptions, so we'll grep its output for error strings
check-for-build-errors:
	$S egrep -i '(error|warn|exception)' $(JEKYLL_LOG) \
	    | eval $(ERROR_ON_OUTPUT)


## Old browser support requires each SVG image also be available as a
## PNG with the same base name
ensure-each-svg-has-a-png:
	$S find $(SITEDIR)/img -name '*.svg' | while read file \
	    ; do test -f $${file%.svg}.png || echo "$$file missing corresponding PNG" \
	; done | eval $(ERROR_ON_OUTPUT)

	
## Some Jekyll errors leave error messages in the text
check-for-liquid-errors:
	$S grep -r 'Liquid syntax error:' $(SITEDIR)/ | eval $(ERROR_ON_OUTPUT)


## Report missing anchors for local links defined in the references file.
#
## Takes less than 1 second here as of 2014-05-16 -harding
check-for-missing-anchors:
	$S sed -n 's!^\[[^]]*]: \+!!; s/ .*//; /#/s!^/!!p' _includes/references.md \
	    | sort -u \
	    | while read link ; do file="$(SITEDIR)/$${link%#*}.html" \
	        ; anchor="$${link##*#}" \
	        ; egrep -ql '(id|name)=.'$$anchor'[^a-zA-Z0-9_-]' $$file \
	        || echo "$$file#$$anchor not found" \
	    ; done | eval $(ERROR_ON_OUTPUT)

check-for-broken-markdown-reference-links:
## Report Markdown reference-style links which weren't converted to HTML
## links in the output, indicating there's no reference definition
	$S find $(SITEDIR) -name '*.html' | xargs grep '\]\[' | eval $(ERROR_ON_OUTPUT)

check-for-non-ascii-urls:
## Always check all translated urls don't contain non-ASCII
## characters or spaces.
	$S find _translations -name '*.yml' | while read file \
	    ; do grep -H . $$file | sed -n -e '/url:/,$$p' \
	    | grep -P '[^\x00-\x7f]|[a-z\-] [a-z\-]' \
	; done | eval $(ERROR_ON_OUTPUT)