prezto_config/modules/git/functions/git-dir

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#
# Gets the path to the Git directory.
#
# Authors:
# Sorin Ionescu <sorin.ionescu@gmail.com>
#
local git_dir="${$(git rev-parse --git-dir):A}"
if [[ -n "$git_dir" ]]; then
print "$git_dir"
return 0
else
print "$0: not a repository: $PWD" >&2
return 1
fi