gitlog-parser fails on abbreviated commit hashes

[ribetm]

Since gitlog-parser uses a simple parsing algorithm with slice slice(7, 47), it requires the hash to be exactly 40 char long (its default length).

Otherwise the git log output will be split incorrectly, causing this error

this._current.message += ('\n'+chunk);
                   ^
TypeError: Cannot read property 'message' of null

If hash abbreviation is enabled in git config, it will fail with the previous error. This can be fixed by calling git log with the abbrev option set to 40 (effectively disabling this configuration).