chore: minify svg husky hook (#10560)

and added hooks for *.svg files

Co-authored-by: Ward Peeters <[email protected]>

Author: lipis

docs/blog/2017-11-08-migrate-from-jekyll-to-gatsby/gatsby.svg

@@ -51,6 +51,10 @@
     "*.{md,css,scss,yaml,yml}": [
       "prettier --write",
       "git add"
+    ],
+    "*.svg": [
+      "svgo --pretty --indent=2 --config=svgo.yml --multipass",
+      "git add"
     ]
   },
   "husky": {
@@ -61,10 +65,10 @@
   "scripts": {
     "bootstrap": "npm-run-all -s check-versions lerna-prepare",
     "check-versions": "babel-node scripts/check-versions.js",
-    "format": "npm run format:code && npm run format:other",
+    "format": "npm run format:code && npm run format:other && npm run format:svg",
     "format:other": "npm run prettier -- --write",
     "format:code": "npm run lint:code -- --fix",
-    "format-svg": "find www examples packages | grep '\\.svg$' | xargs -Iz -n 1 svgo --pretty --indent=2 --config=svgo.yml z",
+    "format:svg": "node scripts/format-svg.js",
     "hooks:uninstall": "node node_modules/husky/husky.js uninstall",
     "hooks:install": "node node_modules/husky/husky.js install",
     "jest": "jest",

package.json

@@ -0,0 +1,24 @@
+// this file exists because svgo only accepts folders or files, to make this work you'll need to do
+// find www examples packages | grep '\\.svg$' | xargs -Iz -n 1 svgo --pretty --indent=2 --config=svgo.yml z
+// this only works on bash not inside windows so we create a simple js file that does the globbing for us
+const glob = require(`glob`)
+const execa = require(`execa`)
+const path = require(`path`)
+
+// list of ignored files because they don't get optimized correctly
+const ignoreList = [
+  `./docs/blog/2017-11-08-migrate-from-jekyll-to-gatsby/diagram-ci.svg`,
+]
+
+const files = glob.sync(`./**/*.svg`, {
+  ignore: [`./node_modules/**`].concat(ignoreList),
+})
+
+const proc = execa(
+  `./node_modules/.bin/svgo`,
+  [`--pretty`, `--indent=2`, `--config=svgo.yml`, `--multipass`].concat(files),
+  { cwd: path.join(__dirname, `..`) }
+)
+
+proc.stdout.pipe(process.stdout)
+proc.stderr.pipe(process.stderr)