progressbar

#!/bin/bash
# written by Shotaro Fujimoto (https://github.com/ssh0)
# first edited: 2015-12-03
#=#=#=
# progressbar - make progress bar easily
#
# **Usage:**
#
# ```
# progressbar n [ barchar_empty barchar_fill ]
# ```
#
# (int `n`: 0 ~ 100) 
#
# > [bash - How to add a progress bar to a shell script? - Stack Overflow](http://stackoverflow.com/questions/238073/how-to-add-a-progress-bar-to-a-shell-script)
#=#=

if [ "$1" = '-h' ]; then
  usage_all "$0"
  exit 0
fi

progressbar() {
  # Usage:
  #   progressbar progress(int: 0 ~ 100) [ barchar_empty barchar_fill ]

  barchar_empty="${2:--}"
  barchar_fill="${3:-#}"

  # TODO: バー以外の文字数をautodetect
  columns=$(( $(tput cols) - 18 ))
  if [[ ${columns} -gt 100 ]]; then
    columns=100
  fi

  # Process data
  _done=$(( ($1 * ${columns}) / 100 ))
  _left=$(( ${columns} - ${_done} ))
  # Build progressbar string lengths
  _fill=$(printf "%${_done}s")
  _empty=$(printf "%${_left}s")

  # Generate progressbar
  printf "\rProgress : [${_fill// /"$barchar_fill"}${_empty// /"$barchar_empty"}] ${1}%%"
}

progressbar $@

# EXAMPLE:
#
# progressbar_test(){
#   # Variables
#   varstart=1
#
#   # This accounts as the "totalState" variable for the ProgressBar function
#   varend=99
#
#   # Proof of concept
#   for number in $(seq ${varstart} ${varend})
#   do
#     sleep 0.01
#     # progress (int: 0 ~ 100)
#     progress=$(( (${number}*100/${varend}*100) / 100 ))
#     progressbar ${progress} "_" "█"
#   done
#   printf '\nFinished!\n'
# }
# . progressbar_test