Add warning message for endpoint starting with / in gh api <endpoint>

[dojutsu-user]

Fixes #6415

Description
Added a warning message for the user whenever the endpoint is starting with a slash.

Before

❯ GH_DEBUG=true ./bin/gh api users/repos
* Request at 2022-10-21 01:16:33.038292 +0530 IST m=+0.030087293
* Request to https://api.github.com/users/repos

❯ GH_DEBUG=true ./bin/gh api /users/repos
* Request at 2022-10-21 01:16:49.221381 +0530 IST m=+0.023171918
* Request to https://api.github.com/users/repos

After

❯ GH_DEBUG=true ./bin/gh api users/repos
* Request at 2022-10-21 01:14:42.116196 +0530 IST m=+0.026859043
* Request to https://api.github.com/users/repos

❯ GH_DEBUG=true ./bin/gh api /users/repos
! warning: '/users/repos' An absolute window-styled path was passed which is likely to fail. Try dropping or escaping the starting slash in the endpoint if it fails.
* Request at 2022-10-21 01:15:06.412425 +0530 IST m=+0.026561084
* Request to https://api.github.com/users/repos

[dojutsu-user]

Hi @samcoe,
Please add the hacktoberfest-accepted label in this PR.

[dojutsu-user]

@samcoe Can you please review this PR.
cc: @mislav

[mislav]

Hi, I think you might have misunderstood the solution I've proposed in the issue.

The problem isn't that some users pass in a path argument with a leading slash. That style of usage is perfectly valid and we shouldn't warn against it.

The problem is that the mingw environment converts those arguments with a leading slash into an absolute, Windows-style file path before invoking gh, which then breaks the gh api command. When that happens, we should error out explaining to the user what happened.

So, what we can do is:

1. Check whether the argument is a Windows-style absolute path. This can be done with runtime.GOOS == "windows" && filepath.IsAbs(opts.RequestPath)
2. Error out and explain to the user that they shouldn't use leading slash in their environment.

Think you could do it?

[samcoe]

Going to close this as stale as contributor has not responded to requested changes.