Sblackを使わずサクッとSlackアプリをダークテーマにする

こんにちは，しまさん（@shimasan0x00）です．

私は今までブラックテーマが使用できるSblackを公式Slackアプリの代わりに使っていました．

www.sblack.online

Sblack – Lightweight Slack client for Mac

~~https://www.sblack.online~~

An ultra-lightweight Mac client for Slack. Goodbye Electron.

ですがこの前Slackの通話機能を使用しようとすると，Sblackではダメでした．

公式SlackアプリもしくはChromeでお願いしますとのこと．

その時はミーティング開始数分前でかなり焦り，Chromeでなんとか凌ぎましたが潔く今後公式Slackを使うことにしました．

ですが相変わらずSlackは白いのでサクッと黒くしていきたいと思います．

Contents

環境
Slackを黒くする
注意点
さいごに

環境

macOS Mojave 10.14

Slack 3.3.7

Slackを黒くする

ということでGitHubを探すと素晴らしいものがありました．

GitHub

widget-/slack-black-theme

https://github.com/widget-/slack-black-theme

A darker, more contrasty, Slack theme. Contribute to widget-/slack-black-theme development by creating an account on GitHub.

簡単にいうと以下の場所のJSファイルの末尾にコードを追加すればOKというものです．

/Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js

おお〜〜簡単じゃんと思ってそのままコピペして実行したらメインの部分が白でサイドバーを変更したただのSlackに….

ということでIssue探したらありました．

GitHub

Had to add some additional css today · Issue #48 · widget-/slack-black-theme

https://github.com/widget-/slack-black-theme/issues/48

It seems that starting from today, I suddenly had to add in these extra bits of CSS to my ssb-interop.js other wise a bunch of stuff (chiefly the background of the main messages pane) in the slack …

2019年3月9日時点で動くコードを以下に貼っておきます．

// First make sure the wrapper app is loaded
document.addEventListener("DOMContentLoaded", function() {

  // Then get its webviews
  let webviews = document.querySelectorAll(".TeamView webview");

  // Fetch our CSS in parallel ahead of time
  const cssPath = 'https://cdn.rawgit.com/widget-/slack-black-theme/master/custom.css';
  let cssPromise = fetch(cssPath).then(response => response.text());

  let customCustomCSS = `
  :root {
    /* Modify these to change your theme colors: */
    --primary: #61AFEF;
    --text: #ABB2BF;
    --background: #282C34;
    --background-elevated: #3B4048;
  }

  div.c-message.c-message--light.c-message--hover,
  .p-flexpane_header,
  .p-shortcuts_flexpane__title,
  .c-message_list__day_divider,
  .c-message_list__day_divider__label,
  .c-message_list__day_divider__label__pill,
  .p-message_pane .c-message_list.c-virtual_list--scrollbar>.c-scrollbar__hider:before,
  .p-message_pane .c-message_list:not(.c-virtual_list--scrollbar):before,
  .c-keyboard_key {
    color: #fff !important;
    background-color: #222 !important;
  }

  span.c-message__body,
  a.c-message__sender_link,
  span.c-message_attachment__media_trigger.c-message_attachment__media_trigger--caption,
  div.p-message_pane__foreword__description span,
  .c-message_attachment,
  .p-shortcuts_flexpane__shortcut_title {
    color: #afafaf !important;
  }

  pre.special_formatting {
    background-color: #222 !important;
    color: #8f8f8f !important;
    border: solid;
    border-width: 1 px !important;
  }

  .c-message,
  .c-virtual_list__item,
  .c-member_slug--link {
    background-color: #222 !important;
  }

  #client_body:not(.onboarding):not(.feature_global_nav_layout):before {
  background-color: #222 !important;
  border: 1px solid #222 !important;
  box-shadow: none !important;
  }

  .ql-placeholder, .c-team__display-name, .c-unified_member__display-name, .c-usergroup__handle, .timezone_value, .timezone, .p-message_pane__foreword__description, .charcoal_grey {
    color: #ccc !important;
  }

  div[role=listitem]:first-child {
    margin-bottom: 20px !important;
  }

  div[role="presentation"]:not(class="c-submenu") { background-color: #282C34 !important; }

  .c-search__input_and_close{
      background:#292d32!important;
      color white !important;
  }
  .c-search__input_box{
      background:#292d32!important;
      color white !important;
  }
  .c-search__input_and_close{
      background:#292d32!important;
      color white !important;
  }
  .c-search_autocomplete{
      background:#b7bcbe!important;
      color white !important;
  }
  .c-search_autocomplete footer{
      background:#97a0a5!important;
      color white !important;
  }
  .c-search_autocomplete__suggestion_text{
      color white !important;
  }
  .c-search_autocomplete__suggestion_content .c-search_autocomplete__suggestion_text{
      color white !important;
  }
  .c-search_autocomplete header{
      background:#b7bcbe!important;
      color:black !important;
  }
  .c-search_autocomplete footer .c-search_autocomplete__footer_navigation_help{
      color:white !important;
  }
  .c-search__input_box .c-search__input_box__input .ql-editor, .c-search__input_box .c-search__input_box__input .ql-placeholder{
      background:#2b2c2e!important;
      border:none !important;
  }
  .c-search__tabs{
      background:#2b2c2e!important;
  }
  .c-search__view{
      background:#2b2c2e!important;
  }
  .c-search_message__body{
      color:#cacbcc !important;
  }
  .p-search_filter__title_text{
      background:#2b2c2e!important;
      color:white !important;
  }
  .p-search_filter__title:before{
      color:grey !important;
  }
  .p-search_filter__dates{
      background:#1f2021!important;
      border: none !important;
      color:#cacbcc !important;
  }
  .p-search_filter__datepicker_trigger:hover{
      color:white !important;
  }
  `

  // Insert a style tag into the wrapper view
  cssPromise.then(css => {
    let s = document.createElement('style');
    s.type = 'text/css';
    s.innerHTML = css + customCustomCSS;
    document.head.appendChild(s);
  });

  // Wait for each webview to load
  webviews.forEach(webview => {
    webview.addEventListener('ipc-message', message => {
        if (message.channel == 'didFinishLoading')
          // Finally add the CSS into the webview
          cssPromise.then(css => {
              let script = `
                    let s = document.createElement('style');
                    s.type = 'text/css';
                    s.id = 'slack-custom-css';
                    s.innerHTML = \`${css + customCustomCSS}\`;
                    document.head.appendChild(s);
                    `
              webview.executeJavaScript(script);
          })
    });
  });
});