Compair is a cli that will take screen shots of webpages and compare them to a previous baseline. This can be incredibly useful when run as part of a continous intergration system. Compair will exit with a non-zero exit code when a comparison does not match a baseline otherwise it will exit with 0. It was designed to be used with Jenkins so that modifications to CSS or HTML that unintentionaly change a design could be caught imediately. It can also speed your development of a responsive design layout.
git clone git@github.com:thurmda/Compair.git
npm install
npm test
This project uses phantomjs and Imagemagick. test/dependencies.sh will check for them. I recommend installing the binaries of phantomjs from http://phantomjs.org/download.html and using a package installer to install Imagemagick, (i.e. Mac `brew install Imagemagick')
Usage: compair --url=[URL] --comp=[path to comp]
Options:
--url [required]
--comp [required]
-b [default: false]
--size [default: "1024"]
--extension [default: ".png"]
--tolerance [default: 0]
--timeout [default: 60000]
- --url Provide a complete URL including protocol. Notice that the tests use file:// to reach the sample pages using a full path. You can use http://username:password@yourdomain.com/path to reach wherever you need.
- --comp Provide a base path to refer to your screen shot(s). This path will be relative to the directory in which you run compair. If you are setting baseline images (with option -b) then screen width will be appended to the filename after a dash. If you are running a comparison then -timestamp-screen_width will get appended to a temporary file. If there are no differences the temporary files will be deleted.
- -b is a flag to set compair into a baseline or comparison mode.
- --size takes a comma seperated list of screen widths you'd like to create/compare
- --tolerance is currently not implemented but is intended to be a minimum total number of pixels allowed to be different before deeming a comparison a failure. THis could be useful if you have a date rendered as part of your page.
- --timeout is the maximum number of milliseconds you will allow compair to execute. If compair reaches this limit it will exit with a non-zero exit code deemed a failure.
I recommend putting the bin folder on your PATH so that you can run compair from anywhere.
Executing compair with no options will print a help message detailing all options
compair
Set a baseline image for a webpage file
compair --url=file://$PWD/test/index.html --comp=test/tmp/readme -b
Compare a slightly different webpage to the baseline captured previously
compair --url=file://$PWD/test/index2.html --comp=test/tmp/readme
Set baseline screenshots in widths for various mobile devices.
compair --url=file://$PWD/test/index.html --comp=test/tmp/readme -size=320,768,1024 -b
Compare gitub pages for different branches of this project:
compair --url=https://github.com/thurmda/compair/demo --comp=compair -b
compair --url=https://github.com/thurmda/compair --comp=compair
###batch example (/examples/batchcompair.sh)
This is an example script that will create a screen shot of multiple urls. Call the script like
./batchcompair urls.txt
script source :
#!/bin/bash
for line in $(cat $1); do
comp=${line/http:\/\//};
compair -b --url=$line --comp=${comp/%\//};
done;
- http://www.ethanmarcotte.com/
- http://forefathersgroup.com/
- http://www.gosphero.com/
- http://css-tricks.com/