git-logger with macOS Support, Original: https://gitlab.com/CrazyBaboon/git-logger/-/blob/master/git-logger.sh?ref_type=heads

git-logger.sh

#!/usr/bin/env bash
set -euo pipefail

# git-logger is free software and is licensed under the GNU GPLv2+.
# (C) 2018-2019 Nuno Ferreira and contributors
# Contributors: James Brown, 
#               qZeta 
#               boweeb1011
#               Mathias Weber
# macOS-compatible tweaks by Devran Cosmo Uenal and ChatGPT (2025)

# ------- setup / cleanup -------
tmp_file="$(mktemp -t gitlogger1)"
tmp_file_2="$(mktemp -t gitlogger2)"

on_exit() {
  status=$?
  [[ -f "$tmp_file" ]] && rm -f "$tmp_file"
  [[ -f "$tmp_file_2" ]] && rm -f "$tmp_file_2"
  exit $status
}
trap on_exit EXIT SIGINT SIGTERM

# Force predictable weekday abbreviations (Mon..Sun)
export LC_ALL=C

# ------- constants -------
# Fixed order avoids GNU/BSD date differences
days=' Mon Tue Wed Thu Fri Sat Sun '
hours='01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 00'
colors=(19 21 23 25 27 30 36 39 41 49 51 154 178 172 166 202 196)

max_hourly_commit=0
total_commits=0
total_daily_commits=0

# ------- collect data -------
if [ -d ".git" ]; then
  # %a = weekday abbrev, %H = hour (00..23)
  git log --pretty=format:"%ad" --date=local --date=format:'%a %H' > "$tmp_file"
elif [ -d ".hg" ]; then
  # Mercurial on macOS: parse ISO dates via Python for portability
  # Outputs "Mon 13" style lines in C-locale
  hg log --template "{date|isodate}\n" | python3 - "$tmp_file" <<'PY'
import sys, datetime, locale
locale.setlocale(locale.LC_ALL, 'C')
for line in sys.stdin:
    line=line.strip()
    if not line: continue
    # Accept e.g. 2021-03-22 14:55 +0100 or 2021-03-22T14:55:00+01:00
    for fmt in ("%Y-%m-%d %H:%M %z","%Y-%m-%d %H:%M:%S %z","%Y-%m-%dT%H:%M %z","%Y-%m-%dT%H:%M:%S%z","%Y-%m-%dT%H:%M:%S%z"):
        try:
            dt=datetime.datetime.strptime(line, fmt)
            break
        except ValueError:
            dt=None
    if dt is None:
        continue
    print(dt.strftime("%a %H"))
PY
else
  echo "Could not find a git or mercurial repository" >&2
  exit 1
fi

# ------- functions -------
find_max() {
  local day hour number_hourly_commits
  for day in $days; do
    grep -F "$day" "$tmp_file" > "$tmp_file_2" || true
    for hour in $hours; do
      number_hourly_commits=$(grep -c -F " $hour" "$tmp_file_2" || true)
      if [ "$number_hourly_commits" -gt "$max_hourly_commit" ]; then
        max_hourly_commit="$number_hourly_commits"
      fi
    done
  done
}

no_color=$(tput sgr0 2>/dev/null || echo "")

display_256() {
  local day hour number_hourly_commits idx color
  printf "\n%s\n" "                          ****** Punch card for $(basename "$PWD") ******                             "
  printf "\n%s\n%s" "      ------------------------------------time of day (hours)-----------------------------------------" "      "
  for hour in $hours; do printf "%s" "| $hour"; done
  printf "| Total"

  for day in $days; do
    printf "\n%s" " $day -"
    grep -F "$day" "$tmp_file" > "$tmp_file_2" || true

    for hour in $hours; do
      number_hourly_commits=$(grep -c -F " $hour" "$tmp_file_2" || true)

      # Guard against divide-by-zero and clamp index 0..15
      if [ "$max_hourly_commit" -gt 0 ]; then
        idx=$(( 16*number_hourly_commits / max_hourly_commit ))
      else
        idx=0
      fi
      [ "$idx" -gt 15 ] && idx=15
      color=$(tput setab "${colors[$idx]}" 2>/dev/null || echo "")

      if [ "$number_hourly_commits" -eq 0 ]; then
        printf "%s" "  $number_hourly_commits "
      elif [ "$number_hourly_commits" -lt 1000 ]; then
        printf "%s%4s%s" "${color}$(tput setaf 0 2>/dev/null)" "$number_hourly_commits" "${no_color}"
      else
        printf "%s%4sk%s" "${color}$(tput setaf 0 2>/dev/null)" "$((number_hourly_commits/1000))" "${no_color}"
      fi

      (( total_commits=total_commits+number_hourly_commits ))
      (( total_daily_commits=total_daily_commits+number_hourly_commits ))
    done
    printf "%s" "|  $total_daily_commits "
    total_daily_commits=0
  done
  printf "\n\n%s\n\n" "total_commits = $total_commits"
}

display_8() {
  local day hour number_hourly_commits
  for day in $days; do
    printf "\n%s" " $day -"
    grep -F "$day" "$tmp_file" > "$tmp_file_2" || true
    for hour in $hours; do
      number_hourly_commits=$(grep -c -F " $hour" "$tmp_file_2" || true)
      if [ "$number_hourly_commits" -eq 0 ]; then
        printf "%s" "  $number_hourly_commits "
      elif [ "$number_hourly_commits" -lt 10 ]; then
        printf "%4s" "$(tput setab 2 2>/dev/null) $(tput setaf 0 2>/dev/null) $number_hourly_commits $(tput sgr0 2>/dev/null)"
      elif [ "$number_hourly_commits" -lt 100 ]; then
        printf "%4s" "$(tput setab 3 2>/dev/null) $(tput setaf 0 2>/dev/null) $number_hourly_commits $(tput sgr0 2>/dev/null)"
      else
        printf "%4s" "$(tput setab 1 2>/dev/null) $(tput setaf 0 2>/dev/null) $number_hourly_commits $(tput sgr0 2>/dev/null)"
      fi
      (( total_commits=total_commits+number_hourly_commits ))
      (( total_daily_commits=total_daily_commits+number_hourly_commits ))
    done
    printf "%s" "|  $total_daily_commits "
    total_daily_commits=0
  done
  printf "\n\n%s\n\n" "Total number of commits is $total_commits"
}

# ------- render -------
colors_supported=$(tput colors 2>/dev/null || echo 0)
if [ "${colors_supported:-0}" -ge 256 ]; then
  find_max
  display_256
else
  display_8
  printf "\n%s\n\n" "####### 8 color display detected. For best results try 256 color display #######"
fi