Commit Briefs
implement spawning an editor to collect a commit message
bails on empty messages, trims leading and trailing newlines this currently disables the unveil in the commit process because it's not compatible with spawning the editor also prevent commits when there are no changes
be less clever: don't nest 'case' inside if (...)
no functional change
got_error_set_errno: take a char arg to pass to got_error_prefix_errno
$> got rm a got: : No such file or directory becomes $> got rm a got: /path/to/a: No such file or directory