Open OS X default screenshots in monosnap (or can be customized to open in a different application)

com.mashupmill.screenshot-watcher.plist

<?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">
<dict>
	<key>Disabled</key>
	<false/>
	<key>KeepAlive</key>
	<true/>
	<key>Label</key>
	<string>com.mashupmill.screenshot-watcher</string>
	<key>Program</key>
	<string>/Users/brandencash/projects/screenshot-watcher/screenshot-watcher.sh</string>
	<key>ProgramArguments</key>
	<array>
		<string>-f</string>
	</array>
	<key>RunAtLoad</key>
	<true/>
	<key>StandardErrorPath</key>
	<string>/tmp/screenshot-watcher.log</string>
	<key>StandardOutPath</key>
	<string>/tmp/screenshot-watcher.log</string>
</dict>
</plist>

install.sh

#!/usr/bin/env bash

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"

ln -s "${DIR}/com.mashupmill.screenshot-watcher.plist" ~/Library/LaunchAgents/com.mashupmill.screenshot-watcher.plist

screenshot-watcher.sh

#!/bin/bash

if [ $# -eq 0 ]; then
    "$0" -f
    exit
fi

APP=/Applications/Monosnap.app
PATTERN='^Screen Shot [0-9]{4}-[0-9]{2}-[0-9]{2} at [0-9]{1,2}\.[0-9]{2}\.[0-9]{2} (AM|PM)\.png$'
WATCH_DIR=~/Desktop
DELETE_AFTER_OPEN=
PATH="/usr/local/bin:$PATH"

if [ -f ~/.screenshot-watcher ]; then
    source ~/.screenshot-watcher
fi

for PARAM in "$@"
do
    case "$PARAM" in
        -w|-f)
            echo "Starting fswatch on $WATCH_DIR"
            npx onchange -v --filter 'add' "${WATCH_DIR}/Screen Shot *.png" -- "$0" "{{changed}}"
            ;;
        -h|--help)
            echo "Has 2 usages..."
            echo "First run \`$0 -f\` which will start up fswatch on $WATCH_DIR."
            echo "When file changes are detected, the file path is passed back to this script running the second usage."
            echo
            echo "Second usage is \`$0 <file>\`."
            echo "It will check the file matches the OS X default Screen Shot filename pattern."
            echo "If it does, then it will open the file in $APP and delete the file."
            echo
            echo "So try it out...run \`$0 -f\` then hit CMD+SHIFT+4 and create a snapshot."
            echo "Then Monosnap should open up with the screenshot and the screenshot should get removed from your desktop."
            ;;
        *)
            FILE="$PARAM"
            NAME=${FILE##*/}
            APP_NAME=${APP##*/}

            case "$APP_NAME" in
                Preview.app)
                    # Preview.app cannot open it if its deleted
                    DELETE_AFTER_OPEN=${DELETE_AFTER_OPEN:-false}
                    ;;
                Monosnap.app)
                    # Monosnap.app supports deleting the file right after opening it...so if we don't have a value set, set it to true
                    DELETE_AFTER_OPEN=${DELETE_AFTER_OPEN:-true}
                    ;;
            esac

            # echo "Found $FILE with name $NAME"
            echo $NAME | grep -E "$PATTERN" >> /dev/null
            MATCHES=$?
            if [ -f "$FILE" ] && [ $MATCHES -eq 0 ]; then
                echo "Opening $FILE in $APP_NAME"
                open -a "$APP" "$FILE"
                if [ "$DELETE_AFTER_OPEN" = true ]; then
                    # wait 5s then delete the file
                    (sleep 5s && echo "Deleting $FILE" && rm "$FILE")&
                fi
            fi
    esac
done