🚀 Transform file paths to be relative to current directory

[dandavison]

Git outputs file paths in various contexts (e.g. hunk headers, --stat output) but if you are not in the root directory of your repository these paths will not be valid as relative paths from your location. This can be annoying, for example the following workflows fail:

• Copy the relative path and try to open it from the command line using something like vim, open, bat, code, emacsclient, etc
• Command-click on the relative path in something like VS Code terminal

Since every line of git output is passing through delta, delta could relativize these paths thus making those workflows succeed.

[dandavison]

Ah, of course, git has an option for this: I need to start adding --relative to my git aliases!

[dandavison]

--relative seems potentially dangerous: e.g. --relative commands do not show changes to files outside the subtree rooted at $PWD, so you might make incorrect decisions about a commit if you view it that way. So perhaps this does make sense for delta to do.

[dandavison]

It looks like git's pager process runs with cwd set to the repo root, but that the path that git was invoked from, relative to repo root, is available in the env var GIT_PREFIX. (As an be seen by doing e.g. git -c core.pager=env show)