Daily bothering with launchd and AppleScript 

Credit: All of the following “someone” is this one.

This morning I noticed this repo was forked into my GitHub organization. I’m still not sure what the original intent was but I interpreted as a permission/offer to contribute. Since the repo’s name is “simplifyLifeScripts”, I spent some time pondering upon what kind of scripts would simplify lives, or more specifically, my life. I then came up with this brilliant idea of automating iMessage sending so that my Mac can send someone this picture of Violet Evergarden on a daily basis:


In the past I had to do this manually by dragging the picture into the small iMessage text box, which was simply too painful to do (I blame Apple). How cool and fulfilling would it be to sit back and let the Apple’s product annoy an Apple employee!

After some GOOGLing I came across this snippet of AppleScript that lets you send an iMessage with your account:

on run {targetBuddyPhone, targetMessage}
    tell application "Messages"
        set targetService to 1st service whose service type = iMessage
        set targetBuddy to buddy targetBuddyPhone of targetService
        send targetMessage to targetBuddy
    end tell
end run

Basically it takes iMessage service from the system and tell it to send the message to a person given a phone number.

Since I also have to send an image as attachment, I added to this piece so it became:

on run {targetBuddyPhone, targetMessage, targetFile}
    tell application "Messages"
        set targetService to 1st service whose service type = iMessage
        set targetBuddy to buddy targetBuddyPhone of targetService

        set filenameLength to the length of targetFile
        if filenameLength > 0 then
            set attachment1 to (targetFile as POSIX file)
            send attachment1 to targetBuddy
        end if

        set messageLength to the length of targetMessage
        if messageLength > 0 then
            send targetMessage to targetBuddy
        end if
    end tell
end run

It now takes one more parameter that’s the file name. The script converts the file name to a POSIX file and send as attachment. I also added two simple checks so that I can send text and/or file.

The next step would be to automate the process. Just when I was ready to Google one more time someone pointed me to Apple’s launchd, which is similar to unix’s cron. launchd lets you daemonize pretty much any process. One needs to compose a plist (a special form of XML) file and put it under /Library/LaunchDaemons/, then the daemon would start as one of the system start up items.

Following the official guide, I made the following plist file:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
        <string>Daily Lucy appreciation :p</string>

The ProgramArguments key is mapped to an array of arguments used to execute the process wrapped in the daemon. In my case, I just run osascript to execute the AppleScript at the absolute path, with the phone number, text message, and the image absolute path as parameters. The phone number is obviously censored.

The other key, StartCalendarInterval, is a handy way to run the job periodically. Any missing key will be filled with “*” wildcard. In this case, the process would be run every day at 00:00. I later changed it to 22:00 after realizing my computer might be shut down at midnight. Can’t miss the bother window.

To avoid restarting my laptop, after copying the file to the launchd directory I did sudo launchctl load {plist file path} so the daemon would start right away.

I did some testing with sending the message every minute and it worked perfectly. It’s worth noting that this is one of the few things that just worked the first try.

Excited for 10pm tonight! Although someone else might not be.

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