prezto_config/modules/git/functions/git-root

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#
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# Displays the path to the working tree root.
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#
# Authors:
# Sorin Ionescu <sorin.ionescu@gmail.com>
#
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local root="$(git rev-parse --show-toplevel 2> /dev/null)"
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if [[ -n "$root" ]]; then
print "$root"
return 0
else
print "$0: not a repository work tree: $PWD" >&2
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return 1
fi