Bash enhanced extraction of common filetypes

extract.sh

## Extract function with progress bars where possible
# Syntax is:
# e [filename]
# 
# Install "pv" and "funzip" packages for progress bars
function e() {
  # Exit the function if the file is not found
  if [[ ! -f "$1" ]]; then
    printf "\n\e[31mERROR: Couldn't find file to extract.\e[0m\n"
    return 1
  fi
  local filename=$(basename $1)
  local dir=$(pwd)

  printf "Extract $filename into $dir\n\n"

  local count=$(\ls | wc -l | awk '{print $1}')
  if [[ $count -ne 0 ]]; then
    printf "\e[33mWARNING: The current directory is not empty!\n\n"
    printf "There are currently [$count] items in this directory.\e[0m\n\n"
    printf "Would you like to proceed anyway? [y/N]\n"
    read -sn 1 p
    if [[ ! $p =~ [yY] ]]; then
      printf "\nCancelled\n"
      return 1
    fi
    echo
  fi

  case "$1" in
    *.7z)       ext=".7z";       cmd="7z";          options="x";     usepv=0;;
    *.tar.bz2)  ext=".tar.bz2";  cmd="tar";         options="jxvf";  usepv=0;;
    *.tbz2)     ext=".tbz2";     cmd="tar";         options="jxvf";  usepv=0;;
    *.tar.gz)   ext=".tar.gz";   cmd="tar";         options="zxvf";  usepv=0;;
    *.tgz)      ext=".tgz";      cmd="tar";         options="zxvf";  usepv=0;;
    *.tar)      ext=".tar";      cmd="tar";         options="xvf";   usepv=0;;
    *.rar)      ext=".rar";      cmd="unrar";       options="x";     usepv=0;;
    *.Z)        ext=".Z";        cmd="uncompress";  options="";      usepv=0;;
    *.bz2)      ext=".bz2";      cmd="bunzip2";     options="";      usepv=1;;
    *.gz)       ext=".gz";       cmd="gunzip";      options="";      usepv=1;;
    *.zip)      ext=".zip";      cmd="unzip";       options="";      usepv=1;;
    *)          printf "\e[31mError: Cannot determine how to extract '$1'\e[0m\n" && return 1;;
  esac

  printf "\e[32mExtracting $filename\e[0m\n"

  # Check if extraction command is installed/executable
  [[ -x "$(type -fP fzf)" ]] || printf "\e[31mError: $cmd is not installed\e[0m\n" && return 1

  # Check if pv is enabled and installed
  if [[ $usepv -eq 1 ]] && [[ -x "$(type -fP pv)" ]]; then
    filesize=$(stat -c '%s' "$1")
    newfile="${1%%$ext}"

    # Handle special case for .zip since unzip command doesn't allow piping and funzip doesn't allow multiple files
    if [[ $ext == ".zip" ]]; then
      # If the .zip contains 1 file and if funzip and pv are installed we can show a progress bar
      if [[ $(zipinfo -t "$1" | awk '{print $1}') -eq 1 ]] && [[ -x "$(type -fP funzip)" ]]; then
        cat "$1" | pv -s $filesize -i 0.1 -D 0 | funzip > "$newfile"
      else
        unzip "$1"
      fi
    else
      # Use pv command to show progress bars
      cat "$1" | pv -s $filesize -i 0.1 -D 0 | $cmd $options > $newfile
    fi
  else
    # Run command
    $cmd $options "$1"
  fi
  printf "\nDone\n\n"
}