Summary

Proof of concept implementation for #326. Adds automatic user switching based on repository-specific gh.user git config setting.

Implementation

When any authenticated command runs, the CLI automatically:

1. Reads gh.user from git config
2. Switches to that user if different from current active user
3. Continues with original command using switched user

Usage

As described in #326, configure per-repository users using git config include:

# In ~/.gitconfig
[includeIf "gitdir:~/work/"]
    path = ~/.gitconfig-work

[includeIf "gitdir:~/personal/"]
    path = ~/.gitconfig-personal

# In ~/.gitconfig-work
[gh]
    user = work-username

# In ~/.gitconfig-personal  
[gh]
    user = personal-username

Now all gh commands automatically use the appropriate user based on repository location:

cd ~/work/some-repo
gh pr create  # Uses work-username

cd ~/personal/my-project  
gh pr create  # Uses personal-username

Files Changed

• internal/config/git_user_switch.go - Core switching logic
• pkg/cmd/factory/default.go - Integration point in HTTP client factory
• internal/config/git_user_switch_test.go - Test suite (9 scenarios)

Testing

All test scenarios pass:

• Not in git repo (skip)
• No gh.user configured (skip)
• User already active (no-op)
• Invalid user (error with warning)
• Successful switch (core functionality)
• Switch failure (error handling)

Proof of Concept Status

This is a functional POC demonstrating the core concept. Implementation works as described in #326 but may need refinement for production:

• Uses first authenticated host (github.com)
• Basic error handling with warnings
• No configuration validation commands
• No integration with existing gh auth switch UX

Manual Verification

Tested with two authenticated users. Switching works correctly:

$ git config gh.user user1
$ gh auth status  # Shows user1 as active

$ git config gh.user user2  
$ gh auth status  # Shows user2 as active

Invalid users show warning but don't break commands.

Note: This POC was generated with Claude Code as a vibecoded exploration of #326.