pull request stack is empty when abbrevCommit=true

[dansimau]

As mentioned here:
#213 (comment)

Problem

git spr up returns pull request stack is empty — even when there are local commits to be pushed and PRs created — when the following git config is present:

[log]
    abbrevCommit=true

helpers.go:78 defines the following regexp for extracting the commit hash:

^commit ([a-f0-9]{40})

However, when using abbreviated commit hashes, this regexp doesn't match. Here is an example of log output with an abbreviated commit hash:

commit ca06022

Using the following config options, the commit hash length could be anywhere between 1-40 characters:

• core.abbrev
• log.abbrevCommit

Solutions

1. Modify the regexp to reflect that a commit hash can be between 1-40 chars, i.e.:

-       commitHashRegex := regexp.MustCompile(`^commit ([a-f0-9]{40})`)
+       commitHashRegex := regexp.MustCompile(`^commit ([a-f0-9]{1,40})`)

2. Always add --no-abbrev-commit when running git log

I would go with option (1), because it is backwards-compatible with git versions prior to the --no-abbrev-commit flag appearing (didn't check when this was though).