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 ()
{
   if ( command -v ruby > /dev/null 2>&1 ); then
      ruby -e "puts Errno.constants.find_all{|err| eval('Errno::' + err + '::Errno') == $@ }"
   elif [ -e /usr/include/errno.h ] ; then
      cpp -dM /usr/include/errno.h | grep -w "E.* $@"
   fi

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

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

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

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

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

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

   case "$filename" in
      *.tar)
         tar xf "${1}"
      ;;
      *.tar.gz|*.tgz)
         gunzip -c "${1}" | tar xf -
      ;;
      *.tar.z)
         uncompress -c "${1}" | tar xf -
      ;;
      *.tar.bz2|*.tbz2|*.tbz)
         bzcat "${1}" | tar xf -
      ;;
      *.zip|*.jar)
         unzip -qo "${1}"
      ;;
      *.gz|*.z)
         gzip -dc "${1}" > `basename "${1%.*}"`
      ;;
      *.bz2)
         bzip2 -dc "${1}" > `basename "${1%.*}"`
      ;;
      *.rar)
         unrar x -idq "${1}"
      ;;
      *.lha|*.lzh)
         lha xqf "${1}"
      ;;
      *.a|*.deb)
         ar x "${1}"
      ;;
      *.tar.lzma)
         lzma -dc "${1}" | tar xf
      ;;
      *.lzma)
         lzma -dc "${1}" > `basename "${1%.*}"`
      ;;
      *.7z)
         7zr x "${1}"
      ;;
      *)
         echo "Unable to extract '"$1"'"
         return 1
      ;;
   esac

   return $?
}

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