reload script for datasette
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	• mmodell
	Sep 2 2021, 9:46 PM

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reload script for datasette
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	#!/bin/bash
	# This is a script that can be used to reload datasette and refresh firefox when you save changes.
	# Auto reload/refresh makes testing changes a lot easier/quicker.
	#
	# This is essentially an infinite loop that restarts datasette when datasette exits,
	# then triggers firefox to refresh the current tab using xdotool (unix/xwindows only, sorry mac people)
	#
	# This script triggers a restart by sending a signal to the datasette process:
	#
	# SIGUSR1 causes datasette to exit and the loop below restarts it.
	#
	# To make this useful, I have a vs.code plugin set up to run this script every time
	# I save a file in the data/ subdirectory. This avoids complex/resource limited filesystem watchers.
	#
	# run this script in a spare terminal to keep datasette running, then have your editor trigger
	# this same script to restart datasette. The script doesn't go into an infinite loop if it finds
	# and existing datasette process to kill. If no datasette process is founed then it loops.
	# ctrl-c to end the infinite loop.
	#
	source venv/bin/activate

	PORT=8002

	refresh() {
	# refresh the active tab in the first visible firefox window that is found.
	# if you have more than one firefox window, minimize all but one.

	sleep 2
	CURRENT_WID=$(xdotool getwindowfocus)

	WID=$(xdotool search --onlyvisible --limit 1 --name "Mozilla Firefox")
	xdotool windowactivate $WID
	xdotool key F5
	xdotool windowactivate $CURRENT_WID
	exit 0 # don't run the infinite loop if we successfully killed a background process
	}

	# restart and refresh
	pkill -f "datasette.+$PORT" -USR1 && refresh;

	# we only get this far if datasette wasn't already running, so start it and go into the loop:

	command="datasette -p $PORT -h 0.0.0.0 --reload ${fileDirname} $@"

	echo "running: $command"
	cleanup () {
	exit 0;
	}
	trap "cleanup" SIGINT
	# trap the SIGINT so that ctrl+c still works in the controlling terminal.
	while [ 1 ]; do
	echo $command;
	$command;

	done
	echo "Exiting..."

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