Don't mess with the cursor on commit or rebase stuff either.
#!/bin/sh
set -eu
if [ -d ~/.hgext/evolve ]; then
hg -R ~/.hgext/evolve fetch
else
hg clone https://www.mercurial-scm.org/repo/evolve ~/.hgext/evolve
printf '[extensions]\nevolve = ~/.hgext/evolve/hgext/evolve.py\n' >> ~/.hgrc.local
fi