Ripper-Tags - wrapper to work with gutentags - taken from - https://github.com/tmm1/ripper-tags/issues/49#issuecomment-386535936

rtags

#!/bin/sh
#
# Wrapper script to make the "ripper-tags" gem (https://github.com/tmm1/ripper-tags)
# work with vim-gutentags (https://github.com/ludovicchabant/vim-gutentags)
# 
# Put this script in your $PATH, make it executable and configure vim-gutentags like this:
#
# "let g:gutentags_ctags_executable_ruby = 'rtags'"
#
# Parts taken from https://stackoverflow.com/a/14203146/171364 and https://github.com/tmm1/ripper-tags/issues/49
# 
POSITIONAL=()
while [[ $# -gt 0 ]]
do
key="$1"

case $key in
    -f)
    TAGS_FILE_NAME="$2"
    shift # past argument
    shift # past value
    ;;
    *)    # unknown option
    POSITIONAL+=("$1") # save it in an array for later
    shift # past argument
    ;;
esac
done
set -- "${POSITIONAL[@]}" # restore positional parameters

if [[ $* = *"--append"* ]]; then
  cat ${TAGS_FILE_NAME} \
    | (cat && ripper-tags --ignore-unsupported-options -f - ${*/--append}) \
    | grep -v '^!_' \
    | sort \
    > tags~ && mv tags~ ${TAGS_FILE_NAME}
else
  ripper-tags --ignore-unsupported-options $*
fi