Minimum Viable Python-only automatic SASS compilation

Makefile

.PHONY: css

CSS=static/screen.css

css: $(CSS)

clean:
	rm $(CSS)

$(CSS): static/%.css: sass/%.scss
	python -mscss -t compressed -o $@ $<

Procfile

sass: watchmedo tricks-from tricks.yaml 

requirements.txt

watchdog==0.8.3
pyscss==1.3.4

tricks.py

from watchdog.tricks import ShellCommandTrick


class MakeTrick(ShellCommandTrick):
    def __init__(self, target=None, patterns=None):
        make_command='make -B %s' % target
        super(MakeTrick, self).__init__(
            shell_command=make_command,
            patterns=patterns,
            wait_for_process=True,
        )

tricks.yaml

tricks:
- tricks.MakeTrick:
    target: 'css'
    patterns: ['*.scss']