Set different email address for multiple git repositories

Problem

I use my own laptop to code for both personal and work projects. However, I want to use my work email address only for my work projects. But I am lazy to set it for each repository.

Here is my folder structure. All work projects are under the same folder ~/src/work. Other projects are personal projects.

~/src/work/project-i        # work project
~/src/work/project-j        # work project
~/src/playground/project-a  # personal project
~/src/bots/project-b        # personal project
~/src/devops/project-c      # personal project

Solution

Step 1. Add an includeIf section to global git config file ~/.gitconfig. (Create this file if it does not exist)

[user]
    name = Franz
    # personal email address
    email = [e-mail]

[includeIf "gitdir:~/src/work/"]
    path = ~/src/work/.gitconfig

Step 2. Add the work email address to our work git config file ~/src/work/.gitconfig. (Create this file if it does not exist)

[user]
    # work email address
    email = [e-mail]

After you have done these steps, when you commit code to your work projects, the email used in commit will be your work email address.