Overview

First of all, thank you for maintaining such a great project!

This PR adds --stub-watch option to gripmock. With this option enabled, the program will watch for changes in the stub directory, and when you make changes in the directory, it will 1) clear all registered stubs (just as calling /clear) and 2) register stubs in the directory.

Motivation

I store all stubs in the directory and load them via --stub option. While this works okay, I need to restart the program every time I edit the stub files, and I thought it would be nice if the program can detect changes and automatically use the latest version.

This is especially useful when we're debugging clients using gripmock as a server.

Discussion

• I decided to clear stubs on change because there is no trivial way to replace a specific stub. This might be problematic if you use both --stub-watch and POST /add at the same time, as stubs added by HTTP API will be deleted.
  • I think you usually want to use one, not both.
  • We might add a field in stub indicating which file it came from to solve this problem.
• I'm not sure if there's a need for this feature. I'm hoping this to be a PoC for people who are using gripmock in a similar way to me even if it doesn't get merged to the mainstream.
• I'm new to Golang. My apologies if there is any rudimentary error.