#!/bin/sh

files=`git ls-files`
above='0'
color=

#
# get date for the given <commit>
#

date() {
  git log --pretty='format: %ai' $1 | cut -d ' ' -f 2
}

#
# get active days for the given <commit>
#

active_days() {
  date $1 | uniq | awk '
    { sum += 1 }
    END { print sum }
  '
}

#
# set 'color' based on the given <num>
#

color_for() {
  test $1 -gt 10 && color='33'
  test $1 -gt 25 && color='33;1'
  test $1 -gt 50 && color='93'
  test $1 -gt 75 && color='93;1'
  test $1 -gt 100 && color='31'
  test $1 -gt 125 && color='31;1'
  test $1 -gt 150 && color='91'
  test $1 -gt 200 && color='91;1'
}

# --above <n-commits>

test "$1" = "--above" && above=$2

# heading

echo
printf "  %-45s %-10s %s\n" 'file' 'commits' 'active days'
echo

# loop files

for file in $files; do
  commits=`git log --oneline $file | wc -l`
  color='90'

  test $commits -le $above && continue

  active=`active_days $file`
  color_for $commits
  printf "  \033[${color}m%-45s %-10d %d\033[0m\n" $file $commits $active
done
echo