find struct with gtags

#! /bin/bash ## check_cache struct history. ## @output: "line file" function check_cache () {     if test $# -ne 2; then     return 1;     else     local struct="$1"     local cache="$2"     result=$(awk '{if ($1 == "'"${struct}"'") {printf "%s %s",$2,$3; exit 0}}' /         ${cache} 2>/dev/null)     fi } ## print_struct line_number file. ## @input "line file" function print_result () {     if test $# -ne 1 ; then     return 1;     else     local line_number=$(echo ${1} | cut -f 1 -d " ")     local file=$(echo ${1} | cut -f 2 -d " ")     less +${line_number} "${file}"     fi } #################################### ## begin here. #################################### declare struct="$1" declare work_dir= case $# in     0)     exit     ;;     1)     struct="$1"     ;;     2)     struct="$1"     working_dir="$2"     ;;     *)     echo "Too much parameter."     exit 1     ;; esac         declare cache_file= declare result= declare number= declare results= if test -z "${working_dir}";then     if test -z "${GTAGSROOT}" ;then     if test -f GTAGS -a -f GPATH -a -f GSYMS -a -f GRTAGS;then         export GTAGSROOT="${PWD}"         cache_file="${PWD}/.cache_file"         if !test -f "${cache_file}"; then         touch "${cache_file}" 2>/dev/null 1>&2         if test $? -eq 0;then             echo "Cant't make cache file."             exit 1         fi         chmod 777 "${cache_file}"         fi     else         echo "No TAGS database."         exit 1     fi     else     cache_file="${GTAGSROOT}/.cache_file"     fi else     cd "${working_dir}" 2>/dev/null 1>&2     if test $? -ne 0;then     echo "Can't access ${working_dir}"     exit 1     else     if test -f GTAGS -a -f GSYMS -a -f GPATH -a -f GRTAGS;then         export GTAGSROOT="${PWD}"         cache_file="${PWD}/.cache_file"         if ! test -f "${cache_file}";then         touch "${cache_file}" 2>/dev/null 1>&2         if test $? -ne 0;then             echo "Can't make cache file."             exit 1         else             chmod 777 "${cache_file}"         fi         fi     else         echo "No TAGS database."         exit 1     fi     fi fi check_cache "${struct}" "${cache_file}" if ! test -z "${result}"; then     print_result "${result}"     exit 0; fi results=$(global -x "${struct}" 2>/dev/null) if test -z "${results}"; then     exit 1 fi records_number=$(echo -e "$results" | wc -l) if test ${records_number} -le 0; then     echo "Can't find the definition of struct ${struct}"     exit 1 else     echo "${results}" | cat -n     read -p "<>: " -n 3 number     if test `expr "${number}" : '[1-9]/{1,3/}'` -ne 1;then     echo "input error."     exit 1         else     if test ${number} -gt ${records_number} -o ${number} -lt 1;then         echo "input error."         exit 1     else         result=$(echo "${results}" | awk '{if (NR == '"${number}"') printf "%s %s",$2,$3}')     fi     fi fi line=$(echo "${result}" | cut -f 1 -d " ") file=$(echo "${result}" | cut -f 2 -d " ") result_dir=${file%/*} result_file=${file##*/} cd ${result_dir} echo "${struct} ${line} ${PWD}/${result_file}" >> "${cache_file}" print_result "${line} ${result_file}"