[zshrc] cleanup "err" function

Author: majnemer

commonsh/10_utility

@@ -24,7 +24,7 @@ err ()
                errno=`ruby -e "puts Errno::${errconst}::Errno" 2>/dev/null`
             fi
             if [ "${errno}" = "" ] && [ -e /usr/include/errno.h ] ; then
-               errno=`cpp -dM /usr/include/errno.h | grep -E "${errconst}[[:space:]]+[0-9]+$" | grep -oE '[0-9]+' 2>/dev/null`
+               errno=`cpp -E -dM /usr/include/errno.h | grep -E "${errconst}[[:space:]]+[0-9]+$" | grep -oE '[0-9]+' 2>/dev/null`
             fi
 
             if [ "${errno}" ] ; then
@@ -37,7 +37,7 @@ err ()
             errno=$1
             unset errconst
             if [ "${errconst}" = "" ] && command -v ruby > /dev/null 2>&1 ; then
-               errconst=`ruby -e "puts Errno.constants.find_all{|err| eval('Errno::' + err + '::Errno') == ${errno} }" 2>/dev/null`
+               errconst=`ruby -e "puts Errno.constants.find_all{|err| Errno.const_get(err)::Errno == ${errno} }" 2>/dev/null`
             fi
             if [ "${errconst}" = "" ] && command -v python > /dev/null 2>&1 ; then
                errconst=`python -c "import errno;print(errno.errorcode[${errno}])" 2>/dev/null`
@@ -46,7 +46,7 @@ err ()
                errconst="${errconst} = ${errno}"
             fi
             if [ "${errconst}" = "" ] && [ -e /usr/include/errno.h ] ; then
-               errconst=`cpp -dM /usr/include/errno.h | grep -E "E[[:alnum:]]+[[:space:]]+${errno}$"`
+               errconst=`cpp -E -dM /usr/include/errno.h | grep -E "E[[:alnum:]]+[[:space:]]+${errno}$"`
             fi
 
             if [ "${errconst}" ] ; then