deps.sh

#!/bin/sh

## DO NOT RUN SCRIPT DIRECTLY
## Use `make deps-update`

set -e

ifupdated() {
  local lastfile=".git/${2}"
  if [ ! -f "$lastfile" ]; then
    echo "no dep commit file for ${1}"
    make $2
    return
  fi
  local last="$(cat $lastfile)"
  local current="$(git log -n 1 --pretty=format:%h -- ${1})"
  if [ "$current" != "$last" ]; then
    make $2
  fi
}

ifupdated glide.yaml deps-go
ifupdated ui/package.json deps-js
ifupdated ui/semantic deps-css

Makefile

# blah blah blah

deps-update: ## update dependencies if changed
	./dev/deps.sh

deps-go:
	glide install
	git log -n 1 --pretty=format:%h -- glide.yaml > .git/deps-go

deps-js:
	cd ui && npm install
	git log -n 1 --pretty=format:%h -- ui/package.json > .git/deps-js

deps-css:
	make -C ui/semantic
	git log -n 1 --pretty=format:%h -- ui/semantic > .git/deps-css