Use standard lessc and minify CSS using Node.js

.drone.yml

@@ -16,6 +16,8 @@ pipeline:
  TAGS: bindata sqlite
  GOPATH: /srv/app
  commands:
+ - apk -U add nodejs nodejs-npm
+ - npm install
  - make clean
  - make generate
  - make vet

.gitignore

@@ -58,3 +58,4 @@ coverage.all
 /integrations/indexers-sqlite
 /integrations/mysql.ini
 /integrations/pgsql.ini
+/node_modules

CONTRIBUTING.md

@@ -97,6 +97,16 @@ and is synced regularily to Crowdin. Once a translation has reached
 A SATISFACTORY PERCENTAGE it will be synced back into this repo and
 included in the next released version.
 
+## Building Gitea
+
+Generally, the go build tools are installed as-needed in the `Makefile`.
+An exception are the tools to build the CSS and images.
+
+- To build CSS: Install [Node.js](https://nodejs.org/en/download/package-manager)
+ with `npm` and then run `npm install` and `make stylesheets`.
+- To build Images: ImageMagick, inkscape and zopflipng binaries must be
+ available in your `PATH` to run `make generate-images`.
+
 ## Code review
 
 Changes to Gitea must be reviewed before they are accepted, no matter who

Makefile

@@ -15,7 +15,6 @@ else
 endif
 
 BINDATA := modules/{options,public,templates}/bindata.go
-STYLESHEETS := $(wildcard public/less/index.less public/less/_*.less)
 DOCKER_TAG := gitea/gitea:latest
 GOFILES := $(shell find . -name "*.go" -type f ! -path "./vendor/*" ! -path "*/bindata.go")
 GOFMT ?= gofmt -s
@@ -299,14 +298,12 @@ stylesheets-check: stylesheets
 fi;
 
 .PHONY: stylesheets
-stylesheets: public/css/index.css
-
-.IGNORE: public/css/index.css
-public/css/index.css: $(STYLESHEETS)
-@which lessc > /dev/null; if [ $$? -ne 0 ]; then \
-$(GO) get -u github.com/kib357/less-go/lessc; \
+stylesheets:
+@hash minify > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+$(GO) get -u github.com/tdewolff/minify/cmd/minify; \
 fi
-lessc -i $< -o $@
+node_modules/.bin/lessc --no-ie-compat public/less/index.less public/css/index.css
+minify -o public/css/index.css public/css/index.css
 
 .PHONY: swagger-ui
 swagger-ui:

package.json

@@ -0,0 +1,6 @@
+{
+ "license": "MIT",
+ "dependencies": {
+ "less": "^2.7.2"
+ }
+}