Jonathan David Page talks about whatever he happens to be thinking about. Sometimes other people join in.
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Since I published Mercurial current branch in your Bash prompt in April, I've made some improvements.
The first is that, in a freshly initialized Mercurial repo,
reporoot/.hg/branch isn't written, so fasthgbranch doesn't find anything. The fix for this is simple: just output "default" if you find a Mercurial repo, but no branch file.
The second is that it now works on Mac OS X (and probably, by extension, *BSD). I recently got a programming job (where we use Mercurial!), and my work computer is a Mac. Porting to OS X involved two changes. Firstly, I had to replace the Linux-only system call
get_current_dir_name() with the equivalent
getcwd(NULL, 0), which is also a Linux extension to POSIX, but happens to work on OS X too. Secondly, OS X sed behaves slightly differently from GNU sed. GNU sed supports both "&" and "\0" to mean "the entire match", while OS X sed only supports &.
All of these improvements have been reflected in the original article.