prezto_config/modules/ruby/functions/ruby-app-root

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#
# Displays the path to the Ruby application root directory.
#
# Authors:
# Sorin Ionescu <sorin.ionescu@gmail.com>
#
local root_dir="$PWD"
while [[ "$root_dir" != '/' ]]; do
if [[ -f "$root_dir/Gemfile" ]]; then
print "$root_dir"
break
fi
root_dir="$root_dir:h"
done
return 1