Adding a script to MacOS finder contextual menu

Question

I want to add an option to the finder context menu that calls hg add %1 with %1 being the full path of the selected file in finder.
Of course there are more

Answer 1

Open Automator, create a custom workflow. From Library choose Utilites, then drag and drop Run shell script to the workflow. Set Pass input to As arguments. Write in your script: hg add $1. Then File menu->Save as a Plugin, specify the name, choose plugin for Finder, Save. Right click on the file, choose More->Autamator->.