Turns out the "standard" way of wrapping errors in Go is via
`fmt.Errorf("%w")`, which doesn't require an external package and also allows a
finer control of error sentence formatting.
If multiple templates are found, the user is prompted to select one.
The templates are searched for, in order of preference:
- issues:
1. `.github/ISSUE_TEMPLATE/*.md`
2. `.github/ISSUE_TEMPLATE.md`
3. `ISSUE_TEMPLATE/*.md`
4. `ISSUE_TEMPLATE.md`
5. `docs/ISSUE_TEMPLATE/*.md`
6. `docs/ISSUE_TEMPLATE.md`
- pull requests:
1. `.github/PULL_REQUEST_TEMPLATE/*.md`
2. `.github/PULL_REQUEST_TEMPLATE.md`
3. `PULL_REQUEST_TEMPLATE/*.md`
4. `PULL_REQUEST_TEMPLATE.md`
5. `docs/PULL_REQUEST_TEMPLATE/*.md`
6. `docs/PULL_REQUEST_TEMPLATE.md`
The filename matches are case-insensitive.
This stubs stderr separately from stdout in command tests (before those
streams were combined) and improves test assertions around output.
Additionally, no longer use the `cmd.Print*()` family of Cobra functions
because their name sounds like the text will go to stdout, but they
write to stderr instead. Use the more explicit `cmd.ErrOrStderr()` as
output destination instead.
