Simple Makefile to minify CSS and JS.

Makefile

# Patterns matching CSS files that should be minified. Files with a -min.css
# suffix will be ignored.
CSS_FILES = $(filter-out %-min.css,$(wildcard \
	public/css/*.css \
	public/css/**/*.css \
))

# Patterns matching JS files that should be minified. Files with a -min.js
# suffix will be ignored.
JS_FILES = $(filter-out %-min.js,$(wildcard \
	public/js/*.js \
	public/js/**/*.js \
))

# Set css minifier and flags
CSS_COMPRESSOR = csstidy
CSS_COMPRESSOR_FLAGS = --discard_invalid=false \
	--template=highest

# Set javascript minifier and flags
JS_COMPRESSOR = uglifyjs
JS_COMPRESSOR_FLAGS = 

CSS_MINIFIED = $(CSS_FILES:.css=-min.css)
JS_MINIFIED = $(JS_FILES:.js=-min.js)

# target: minify - Minifies CSS and JS.
minify: minify-css minify-js

# target: minify-css - Minifies CSS.
minify-css: $(CSS_FILES) $(CSS_MINIFIED)

# target: minify-js - Minifies JS.
minify-js: $(JS_FILES) $(JS_MINIFIED)

%-min.css: %.css
	@echo '==> Minifying css file $<'
	$(CSS_COMPRESSOR) $< $(CSS_COMPRESSOR_FLAGS) >$@
	@echo

%-min.js: %.js
	@echo '==> Minifying javascript file $<'
	$(JS_COMPRESSOR) $(JS_COMPRESSOR_FLAGS) -o >$@ $<
	@echo

# target: clean - Removes minified CSS and JS files.
clean:
	rm -f $(CSS_MINIFIED) $(JS_MINIFIED)

# target: help - Displays help.
help:
	@egrep "^# target:" Makefile