HipChat CSS mod for message list styling improvements

hipchat_mod.sh

#!/bin/bash
set -e

######################################################### 
# 
# HipChat CSS mod for message list styling improvements
#
# Hack at your own risk
#
######################################################### 

HIPCHAT_PATH="/Applications/HipChat.app/"
if [[ ! -d "$HIPCHAT_PATH" ]]; then
    echo "Finding path to HipChat using AppleScript (this will open up HipChat if it's not already running)"
    HIPCHAT_PATH=$(osascript -e 'POSIX path of (path to application "HipChat")')
fi
if [[ ! -d "$HIPCHAT_PATH" ]]; then
    echo Could not locate HipChat installation folder.
    exit 1
fi
CUSTOM_CSS_PATH="$HIPCHAT_PATH/Contents/Resources/chat-custom.css"
HTML_TEMPLATE_PATH="$HIPCHAT_PATH/Contents/Resources/chat.html"


uninstall() {
    # Delete custom CSS file if it exists
    rm -f "$CUSTOM_CSS_PATH"
    
    # Remove custom CSS include from HTML template.
    sed -i.bak '/chat-custom.css/d' "$HTML_TEMPLATE_PATH"
}


# Load custom CSS into a bash variable
define(){ IFS='\n' read -r -d '' ${1} || true; }
define CUSTOM_CSS <<EndOfMessage
/* em-based date divider margin */
.dateDivider {
    margin: 1.8em 0;
}
/* em-based date divider size */
.dateDivider span {
    font-size: 1.5em;
}
/* Less message padding */
.chatBlock td {
    padding: 4px 0;
}

/* Vertically center and emoticons */
img[name="emoticon"] {
    height: 1.75em;
    width: auto;
    margin-top: -.25em;
    position: relative;

}

/* Lighter outgoing message background */
.me {
    background-color: #ecf2f8
}

/* More appropriately-sized code blocks */
.messageBlock pre * {font-family: inherit;}
.messageBlock pre {
    font-family: Input, Menlo !important;
    font-size: 80%;
}
EndOfMessage

install() {
    # Write custom CSS to a new file.
    printf "%s" "$CUSTOM_CSS" > "$CUSTOM_CSS_PATH"

    # Modify the existing HTML template to include the custom CSS.
    sed -i.bak 's/<\/head>/\<!-- custom styles --> <link rel="stylesheet" href="chat-custom.css">\
<\/head>/' "$HTML_TEMPLATE_PATH"
}

if [[ "$1" == "--uninstall" ]]; then
    echo "Uninstalling HipChat CSS modifications..."
    uninstall
else 
    echo "Uninstalling any existing HipChat CSS modifications..."
    uninstall

    echo "Installing HipChat CSS modifications..."
    install
fi

echo "Success! Restart HipChat to see changes."