gistfile1.txt

#!/bin/bash

FILENAME="pytest.html"
FILEPATH="$PWD/$FILENAME"

CMD="${@:1} --html=$FILENAME"
PROJECT_NAME=$(basename $PWD)

function runCommand {
    $CMD
}

function openTab {
osascript <<EOF
    tell application "Google Chrome"
        activate
        open location "file://$FILEPATH"
    end tell
EOF
}

function refreshTab {
osascript <<EOF
	tell application "Google Chrome"
		activate
		set windowList to every window
		repeat with aWindow in windowList
			set tabList to every tab of aWindow
			repeat with atab in tabList
				if (URL of atab contains "$FILEPATH") then
					tell atab
						activate
						reload
					end tell
				end if
			end repeat
		end repeat
	end tell
EOF
}

runCommand
openTab

fswatch -o $PWD/$PROJECT_NAME $PWD/test $PWD/lib -e ".*" -i "\\.py$" | while read file event; do
    if [ "$file" == "2" ]; then
        echo "change detected, running '$CMD'"
        runCommand
        refreshTab
    fi
done