dots/commonsh/10_utility

#! /bin/sh
# utility.sh
# Miscellaneous Utility Functions

unkey_host ()
{
   [ $# -ne 1 ] && return 1
   sed -i -e "/$1/d" $HOME/.ssh/known_hosts
}

err ()
{
      case $1 in
         E*)
            errconst=$1
            unset errno
            if [ "${errno}" = "" ] && ( command -v python > /dev/null 2>&1 ); then
               errno=`python -c "import errno;print(errno.${errconst})" 2>/dev/null`
            fi
            if [ "${errno}" = "" ] && ( command -v perl > /dev/null 2>&1 ); then
               errno=`perl -MErrno -e "print &Errno::${errconst}.\"\n\";" 2>/dev/null`
            fi
            if [ "${errno}" = "" ] && ( command -v ruby > /dev/null 2>&1 ); then
               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`
            fi

            if [ "${errno}" ] ; then
               echo "${errconst} = ${errno}"
            else
               return 1
            fi
         ;;
         *)
            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} }, ' = ${errno}'" 2>/dev/null`
            fi
            if [ "${errconst}" = "" ] && ( command -v python > /dev/null 2>&1 ); then
               errconst=`python -c "import errno;print(errno.errorcode[${errno}] + ' = ${errno}')" 2>/dev/null`
            fi
            if [ "${errconst}" = "" ] && [ -e /usr/include/errno.h ] ; then
               errconst=`cpp -dM /usr/include/errno.h | grep -E "E[[:alnum:]]+[[:space:]]+${errno}$"`
            fi

            if [ "${errconst}" ] ; then
               echo $errconst
            else
               return 1
            fi
         ;;
   esac

   unset errstr
   if [ "${errstr}" = "" ] && ( command -v perl > /dev/null 2>&1 ) ; then
      errstr=`perl -MPOSIX -e 'print strerror($ARGV[0])."\n";' $errno`
   fi
   if [ "${errstr}" = "" ] && ( command -v python > /dev/null 2>&1 ) ; then
      errstr=`python -c "import os;print(os.strerror($errno))" 2>/dev/null`
   fi

   if [ "${errstr}" ] ; then
      echo $errstr
   else
      return 2
   fi
}

mkcd ()
{
   if [ -d "$1" ] ; then
      cd "$1"
      return
   fi

   mkdir -p "$1" && cd "$1"
}

extract ()
{
   if [ ! -f "$1" ] ; then
      echo "The file ("$1") does not exist!"
      return
   fi

   if ( command -v aunpack > /dev/null 2>&1 ) ; then
      aunpack "${1}"
      return
   fi

   filename=`echo "$1" | tr '[:upper:]' '[:lower:]'`

   case "$filename" in
      *.tar)
         tar xf "${1}"
      ;;
      *.tar.bz2|*.tbz2|*.tbz)
         bzip2 -dc "${1}" | tar xf -
      ;;
      *.tar.gz|*.tgz|*.tz)
         gzip -dc "${1}" | tar xf -
      ;;
      *.tar.lzma|*.tlz)
         lzma -dc "${1}" | tar xf -
      ;;
      *.tar.xz|*.txz)
         xz -dc "${1}" | tar xf -
      ;;
      *.tar.z|*.tar.Z|*.taz)
         uncompress -c "${1}" | tar xf -
      ;;
      *.tar.7z|*.t7z)
         7zr x -so "${1}" | tar xf -
      ;;
      *.lzma)
         lzma -dc "${1}" > `basename "${1%.*}"`
      ;;
      *.a|*.deb)
         ar x "${1}"
      ;;
      *.ace)
         unace x "${1}"
      ;;
      *.arj)
         arj x "${1}"
      ;;
      *.cpio)
         cpio -id < "${1}"
      ;;
      *.rpm)
         rpm2cpio "${1}" | cpio -id
      ;;
      *.lha|*.lzh)
         lha xqf "${1}"
      ;;
      *.pax)
         pax -rf "${1}"
      ;;
      *.pax.bz2)
         bzip2 -dc "${1}" | pax -rf -
      ;;
      *.rar)
         unrar x -idq "${1}"
      ;;
      *.rz)
         rzip -d -f -k "${1}"
      ;;
      *.zip|*.jar)
         unzip -qo "${1}"
      ;;
      *.zoo)
         zoo x "${1}"
      ;;
      *.bz2|*.bz)
         bzip2 -dc "${1}" > `basename "${1%.*}"`
      ;;
      *.gz|*.z)
         gzip -dc "${1}" > `basename "${1%.*}"`
      ;;
      *.xz)
         xz -dc "${1}" > `basename "${1%.*}"`
      ;;
      *.Z)
         uncompress -c "${1}" > `basename "${1%.*}"`
      ;;
      *.7z)
         7zr x "${1}"
      ;;
      *)
         echo "Unable to extract '"$1"'"
         return 1
      ;;
   esac

   return $?
}

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