discocss

#!/bin/sh

confdir="${XDG_CONFIG_HOME:=$HOME/.config}/discocss"
preloadFile="$confdir/preload.js"
cssFile="$confdir/custom.css"

mkdir -p "$confdir"

touch "$cssFile"

cat <<EOF > "$preloadFile"
module.exports = () => {
  const fs = require("fs");
  const electron = require("electron");
  const confDir = "$confdir";
  const cssFile = "$cssFile";

  function reload() {
    const css = fs.readFileSync(cssFile, { encoding: "utf-8" });

    electron.webFrame.executeJavaScript(\`
      (() => {
        let loaded = false;
        function load() {
          if (loaded) return;

          const disco = document.createElement("style");
          disco.id = "disco";
          disco.innerHTML = \${JSON.stringify(css)};

          document.getElementById('disco')?.remove();
          document.head.appendChild(disco);

          loaded = true;
        }

        window.addEventListener("load", () => {
          load();
        });
        try {
          load();
        } catch (e) {}
      })();
    \`);
  }

  reload();
  fs.watch(confDir, {}, () => reload());
};

module.exports.mw = (mainWindow) => {
  mainWindow.setBackgroundColor("#00000000");
};

module.exports.mo = (options) => {
  options.transparent = true;
  if (process.platform === "linux") {
    options.frame = true;
  }
};
EOF

ln -f -s "$preloadFile" /tmp/discocss-preload.js

if [ "$(uname)" = "Darwin" ]; then
  sed_options='-i ""'
  core_asar="$(echo "$HOME/Library/Application Support/discord/"*"/modules/discord_desktop_core/core.asar")"
else
  sed_options='-i'
  core_asar="$(echo "$XDG_CONFIG_HOME/discord/"*"/modules/discord_desktop_core/core.asar")"
fi

app_preload_replace='s|  // App preload script, used to provide a replacement native API now that|try {require\(`/tmp/discocss-preload.js`)()} catch \(e\) {console.error\(e\);} |'
launch_main_app_replace='s|// launch main app window; could be called multiple times for various reasons| const dp = require(`/tmp/discocss-preload.js`);                             |'
frame_true_replace='s|    mainWindowOptions.frame = true;|}dp.mo(mainWindowOptions);{        |'
causing_the_window_replace='s|// causing the window to be too small on a larger secondary display| dp.mw(mainWindow);                                                |'
LC_ALL=C sed $sed_options "$app_preload_replace; $launch_main_app_replace; $frame_true_replace; $causing_the_window_replace" \
  "$core_asar"

discordBin="$DISCOCSS_DISCORD_BIN"
if [ "$discordBin" ]; then
  unset DISCOCSS_DISCORD_BIN
  exec "$discordBin"
else
  command -v discord && exec discord
  command -v Discord && exec Discord
fi