A shell script to change slack's colors

slack-day

#!/bin/bash

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
INTEROP_FOLDER="/Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static"
BACKUP_FILE="$DIR/backup/ssb-interop.js"

if [ -f "$BACKUP_FILE" ]
then
    cp "$BACKUP_FILE" "$INTEROP_FOLDER"

    # restart slack
    killall "Slack" # kill all slack processes
    /Applications/Slack.app/Contents/MacOS/Slack </dev/null &>/dev/null & # start slack process in detached mode
fi

slack-theme

#!/bin/bash

function show_usage() {
echo "
NAME
     slack-theme

SYNOPSIS
     sh slack-theme
     sh slack-theme day
     sh slack-theme night
     sh slack-theme night-mono
     sh slack-theme aubergine
     sh slack-theme aubergine-mono
     sh slack-theme arc-dark
     sh slack-theme midnight-blue
     sh slack-theme midnight-blue-mono

DESCRIPTION
     Change Slack Colors

COMMANDS
     day
          Revert to Day Mode

     night
          Use Black CSS

     night-mono
          Use Night-Mono CSS

     aubergine
          Use Aubergine CSS

     aubergine-mono
          Use Aubergine-Mono CSS

     arc-dark
          Use Arc-Dark CSS

     midnight-blue
          Use Midnight-Blue CSS

     midnight-blue-mono
          Use Midnight-Blue-Mono CSS

Report any bugs to mykehell123@gmail.com
"
}

ARC_DARK_PATH="https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/variants/arc-dark.css"
AUBERGINE_PATH="https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/variants/aubergine.css"
AUBERGINE_MONO_PATH="https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/variants/aubergine-monospaced.css"
BLACK_PATH="https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/black.css"
BLACK_MONO_PATH="https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/variants/black-monospaced.css"
MIDNIGHT_BLUE_PATH="https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/variants/midnight-blue.css"
MIDNIGHT_BLUE_MONO_PATH="https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/variants/midnight-blue-monospaced.css"

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
INTEROP_FILE="/Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js"
BACKUP_FOLDER="$DIR/backup"
BACKUP_FILE="$BACKUP_FOLDER/ssb-interop.js"

if [ -z "$1" ]
then
    show_usage
    exit 0
fi

if [ "$1" == "install" ]
then
    chmod 755 "$DIR/slack-theme"
    if [ -z "$(cat ~/.bash_profile | grep "PATH=\$PATH:$PWD")" ]
    then
        echo "export PATH=\$PATH:$PWD" >> ~/.bash_profile
    fi
    echo "installed successfully"
    exit 0
fi

if [ "$1" == "day" ]
then
    . "$DIR/slack-day"
    exit 0
fi

if [ "$1" == "night" ]
then
    CSS_PATH="$BLACK_PATH"
fi

if [ "$1" == "night-mono" ]
then
    CSS_PATH="$BLACK_MONO_PATH"
fi

if [ "$1" == "aubergine" ]
then
    CSS_PATH="$AUBERGINE_PATH"
fi

if [ "$1" == "aubergine-mono" ]
then
    CSS_PATH="$AUBERGINE_MONO_PATH"
fi

if [ "$1" == "arc-dark" ]
then
    CSS_PATH="$ARC_DARK_PATH"
fi

if [ "$1" == "midnight-blue" ]
then
    CSS_PATH="$MIDNIGHT_BLUE_PATH"
fi

if [ "$1" == "midnight-blue-mono" ]
then
    CSS_PATH="$MIDNIGHT_BLUE_MONO_PATH"
fi

if [ -z "$CSS_PATH" ]
then
    echo "invalid command"
    exit 1
fi

NODE_SCRIPT="
document.addEventListener('DOMContentLoaded', function() {
 $.ajax({
   url: '$CSS_PATH',
   success: function(css) {
     let overrides = \`
     code { background-color: #535353; color: #85c5ff; } /* Change color: to whatever font color you want */
     .c-mrkdwn__pre, .c-mrkdwn__quote { background: #535353 !important; background-color: #535353 !important; }
     \`
     \$('<style></style>').appendTo('head').html(css + overrides);
   }
 });
});
"

if [ -f "$INTEROP_FILE" ]
then
    mkdir -p "$DIR/backup" # create folder if it does not exist
    if [ -z "$(cat "$INTEROP_FILE" | grep "DOMContentLoaded")" ]
    then
        cp "$INTEROP_FILE" "$BACKUP_FOLDER" # copy file as backup
    else
        if [ -f "$BACKUP_FILE" ]
        then
            cp "$BACKUP_FILE" "$INTEROP_FILE"
        else
            echo "backup file not found"
            exit 1
        fi
    fi
    echo "$NODE_SCRIPT" >> "$INTEROP_FILE" # append script to file
    
    # restart slack
    killall "Slack" # kill all slack processes
    /Applications/Slack.app/Contents/MacOS/Slack </dev/null &>/dev/null & # start slack process in detached mode
else
    echo "file does not exist"
fi

To download and install, run the following code in your terminal:

curl https://raw.githubusercontent.com/mykeels/slack-theme-cli/master/slack-theme -O && sh slack-theme install && . ~/.bash_profile