macOS installation script.

install_black.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+#
+# Usage: chmod +x install_black.sh; ./install_black.sh
+#
+#get css
+cp /Applications/Slack.app/Contents/Resources/black.css https://raw.githubusercontent.com/laCour/slack-night-mode/master/css/raw/black.css
+#make slack load css
+if [[ `grep 'filePath = "/Applications/Slack.app/Contents/Resources/black"' /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js | wc -l` -lt 1 ]]; then
+    echo 'installing css';
+echo 'document.addEventListener("DOMContentLoaded", function() {
+  var fs = require("fs"),
+  filePath = "/Applications/Slack.app/Contents/Resources/black.css";
+  fs.readFile(filePath, {encoding: "utf-8"}, function(err, data) {
+    if (!err) {
+      var css = document.createElement("style")
+      css.innerText = data;
+      document.getElementsByTagName("head")[0].appendChild(css);
+    }
+  })
+});' >> /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js;
+else echo 'css already installed';
+fi