gh pr diff for a single filepath

[Bhupesh-V]

Describe the feature or problem you’d like to solve

So by default diffs of all the file changes are presented to the user. Parsing diff for a single file path is possible using sed but it can be error-prone and let's be honest not the best way to do it

escaped_filepath=${1//\//\\/}
gh pr diff --color always 34 | sed -n "/diff --git a\/$escaped_filepath/d;/diff/q;p"

Proposed solution

I believe we can refer to this behavior from the git command itself,

git diff myBranch..targetBranch -- relative_filepath

We can retrofit waigani's diffparser to filter out diffs when the user requests so

Let me know if this is something useful enough, More than happy to pick it up

[samcoe]

@Bhupesh-V Thanks for the feature request but this is a limitation of the API unfortunately. The API does not have the ability to retrieve just a single file diff from a PR. As you stated we could introduce a new library to manually parse the full diff and discard all but the desired file changes but the one you linked appears to be unmaintained. As git already provides an alternative solution to the problem I am going to close this as won't add. Perhaps it is worth investigating if third-party diff viewers such as delta can provide this functionality by piping the output of gh pr diff to it.

[wojsmol]

Maybe after we have https://docs.github.com/en/rest/pulls/pulls#list-pull-requests-files adding this can be reconsidered?