TileMill in bash + AppleScript

README.md

TileMill in bash + AppleScript

Installation (OS X)

In the project directory:

npm install tessera tilelive-mapnik tilelive-carto
brew install fswatch

Copy tilemill.scpt and tilemill.sh from this gist into the same directory and run ./tilemill.sh.

Assumptions

make-based build for a map project (e.g. Toner, openstreetmap-carto). If you're using a vanilla TileMill project (with local datasources, i.e. no Millstone), remove make xml and change the map URI to carto+file://./project.mml.

tilemill.scpt

tell application "Google Chrome"
	activate
	set theUrl to "http://localhost:8080/"

	if (count every window) = 0 then
		make new window
	end if

	set found to false
	set theTabIndex to -1
	repeat with theWindow in every window
		set theTabIndex to 0
		repeat with theTab in every tab of theWindow
			set theTabIndex to theTabIndex + 1
			if theTab's URL starts with theUrl then
				set found to true
				exit
			end if
		end repeat

		if found then
			exit repeat
		end if
	end repeat

	if found then
		tell theTab to reload
		set theWindow's active tab index to theTabIndex
		set index of theWindow to 1
	else
		tell window 1 to make new tab with properties {URL:theUrl}
	end if
end tell

tilemill.sh

#!/bin/sh

PATH=node_modules/.bin:$PATH

while true; do
  make xml
  tessera mapnik://./project.xml &
  pid=$!
  
  # alternately, if make is not in use
  # tessera carto+file://./project.mml &
  # pid=$!
  
  # give tessera time to start
  sleep 1

  # comment this out if you don't want Chrome to automatically reload
  osascript tilemill.scpt

  fswatch -1 .

  # kill tessera
  kill $pid
done