osascript to reload chrome or firefox, make reloadbrowser.sh available to watchr via PATH or otherwise...

reloadbrowser.sh

#!/usr/bin/osascript

-- setting to return focus to the initial calling app (in my case it's Textmate)
set callingApp to (path to frontmost application as Unicode text)

-- tell application "Google Chrome"
--  activate
-- end tell
-- 
-- tell application "System Events"
--  tell process "Google Chrome"
--      keystroke "r" using {command down}
--  end tell
-- end tell

tell application "Firefox"
    activate
end tell

tell application "System Events"
    tell process "Firefox"
        keystroke "r" using {command down}
        delay 0.1
    end tell
end tell

-- return focus to calling app
tell application callingApp
    activate
end tell

script.file

# to be placed in a rails project at the top level, then run:
# watchr script.file
# regex is a bit too greedy I think...
# this also assumes the reloadbrowser script is in your PATH (mine is in /usr/local/bin)

watch( 'app/(.*/.*)(\.js|\.scss|\.haml)' )  {|md| system("reloadbrowser") }