I'm adding Erlang support for difftastic! The basic diffing works, but I'm still tweaking syntax highlighting.
The grammar distinguishes between "strings" and 'atoms', but I'm not sure if I should highlight both the same way.
miniblog.
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It's surprisingly fiddly to parse unfinished multiline expressions in a REPL.
In Garden, my toy language, the parser distinguishes 'incomplete' from other others, so I can keep appending text and re-parsing until something useful comes out.
I've learnt a little hg recently, and I really like how it distinguishes local branches that haven't been released yet. With git, a local branch is not shown as diverging from the upstream trunk!
Mercurial has strictly more information here with its notion of phases.
