add git activity script

1 files changed, 139 insertions, 0 deletions

diff --git a/git-activity b/git-activity
new file mode 100755
index 0000000..45135a4
--- /dev/null
+++ b/git-activity
@@ -0,0 +1,139 @@
+#!/usr/bin/env bash
+
+set -o nounset
+
+function usage() {
+  cat <<EOF
+Usage: $0 [-h] [-n] [-s style]
+
+Display an activity graph (like the contribution graph on GitHub) for the
+current git repository and branch
+
+Available options:
+
+-h, --help      Print this help and exit
+-n, --no-space  Remove spaces between week columns
+-s, --style     Sets style of the graph: square (default), block, or plus
+EOF
+}
+
+# Parse options
+space=" "
+style=square
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    -s|--style)
+      style="$2"
+      shift 2
+      ;;
+    -n|--no-space) space="" ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "Unexpected option ${1}" >&2
+      usage
+      exit 1
+      ;;
+  esac
+  shift
+done
+
+# Style argument
+case "${style}" in
+square)
+  char_full="■"
+  char_void="${char_full}"
+  ;;
+block)
+  char_full="█"
+  char_void="${char_full}"
+  ;;
+plus)
+  char_full="✚"
+  char_void="•"
+  ;;
+*)
+  echo "error: style '${style}' not recognized (square block plus)" >&2;
+  exit 1;;
+esac
+
+# Use GNU date if available
+if date --version >/dev/null 2>&1 ; then
+  function _date { date "$@" ;}
+elif gdate >/dev/null 2>&1 ; then
+  function _date { gdate "$@" ;}
+else
+  echo "You need to install coreutils to run this script (command 'gdate' is not available).";
+  exit 1;
+fi
+
+# Process commits per day
+declare -A commits_per_day
+commits_max=0
+since=$(_date -d "$(_date -d '1 year ago + 1 day' +"%F -%u day")" +"%s")
+while read -r commits_n commits_date; do
+  (( commits_n > commits_max )) && commits_max=$commits_n
+  date_diff=$(( ($(_date --date="${commits_date} 13:00 UTC" "+%s") - since) / (60*60*24) ))
+  commits_per_day["${date_diff}"]=$commits_n
+done <<< $(git log --since="${since}" --date=short --pretty=format:'%ad'  | uniq -c)
+
+# Print name of months
+current_month=$(_date "+%b")
+limit_columns=$(( 2 - ${#space} ))
+weeks_in_month=$(( limit_columns + 1 ))
+printf "\e[m    "
+for week_n in $(seq 0 52); do
+  month_week=$(_date -d "1 year ago + ${week_n} weeks" "+%b")
+  if [[ "${current_month}" != "${month_week}" ]]; then
+    current_month=$month_week
+    weeks_in_month=0
+    printf "%-3s%s" "${current_month:0:3}" "$space"
+  elif [[ $weeks_in_month -gt $limit_columns ]]; then
+    printf " %s" "$space"
+  fi
+  weeks_in_month=$(( weeks_in_month + 1 ))
+done
+printf "\n"
+
+# Print activity
+last_day=$(( ($(_date "+%s") - since) / (60*60*24) ))
+name_of_days=("" "Mon" "" "Wed" "" "Fri" "" "")
+for day_n in $(seq 0 6); do
+  printf '\e[m%-4s' "${name_of_days[day_n]}"
+  for week_n in $(seq 0 52); do
+    key=$(( week_n * 7 + day_n ))
+    if [[ -v commits_per_day["${key}"] ]]; then
+      value=$(( ${commits_per_day["${key}"]}00 / commits_max))
+      if (( value <= 25 )); then
+        # Low activity
+        printf "\x1b[38;5;22m%s%s" "$char_full" "$space"
+      elif (( value <= 50 )); then
+        # Mid-low activity
+        printf "\x1b[38;5;28m%s%s" "$char_full" "$space"
+      elif (( value <= 75 )); then
+        # Mid-high activity
+        printf "\x1b[38;5;34m%s%s" "$char_full" "$space"
+      else
+        # High activity
+        printf "\x1b[38;5;40m%s%s" "$char_full" "$space"
+      fi
+    elif [ $key -lt $last_day ]; then
+      # No activity
+      printf "\x1b[38;5;250m%s%s" "$char_void" "$space"
+    fi
+  done
+  printf "\n"
+done
+printf "\n"
+
+# Print legend
+printf "\e[m Less "
+printf "\x1b[38;5;250m%s " "$char_void"
+printf "\x1b[38;5;22m%s " "$char_full"
+printf "\x1b[38;5;28m%s " "$char_full"
+printf "\x1b[38;5;34m%s " "$char_full"
+printf "\x1b[38;5;40m%s " "$char_full"
+printf "\e[mMore"
+printf "\n"