count lines inserted by each user

log_settings.sh

#!/bin/sh

DIRS=(
    chrome/browser/ui/webui/settings/
    chrome/browser/resources/settings/
    chrome/test/data/webui/settings/
    ui/webui/resources/cr_elements/cr_dialog/
    ui/webui/resources/cr_elements/policy/
    ui/webui/resources/cr_elements/network/
)

FILES=(
    ui/webui/resources/cr_elements/shared_style_css.html
    ui/webui/resources/cr_elements/shared_vars_css.html
    chrome/app/settings_*
)

set -e

START=2015-01-01
END=2017-07-01

COUNTS=""

git log --pretty=format:%h --after "$START" --before "$END" -- ${DIRS[@]} | {
  while read; do
    commit=$REPLY
    INSERTIONS=0
    #DELETIONS=0

    DIFFSTATS=()
    for dir in ${DIRS[@]}; do
      DIFFSTATS+=("$(git show "$commit" --stat --relative="$dir" --pretty=oneline)")
    done
    for file in ${FILES[@]}; do
      DIFFSTATS+=("$(git show "$commit" --stat --pretty=oneline "$file")")
    done

    for diff in "${DIFFSTATS[@]}"; do
      if [[ $(echo -e "$diff" | wc -l) -lt 2 ]]; then
        continue
      fi
      DIFFSTAT=$(echo -e "$diff" | tail -n 1)
      if echo "$DIFFSTAT" | grep -q insertion; then
        INSERTIONS=$((INSERTIONS + $(echo "$DIFFSTAT" | sed 's%.* \([0-9]*\) insertion.*$%\1%')))
      fi
      # optional: do something with deletions...
      #if echo "$DIFFSTAT" | grep -q deletion; then
        #DELETIONS=$((DELETIONS + $(echo "$DIFFSTAT" | sed 's%.* \([0-9]*\) deletion.*$%\1%')))
      #fi
    done

    TOTAL=$((INSERTIONS))
    #TOTAL=$((INSERTIONS - DELETIONS))
    if [[ $TOTAL -gt 0 ]]; then
      AUTHOR=$(git log -n 1 "$commit" --pretty='%ae')
      COUNTS+="$AUTHOR $TOTAL\n"
    fi
  done;

  echo -e "$COUNTS" | awk '{a[$1]+=$2}END{for(i in a) print a[i], i}' | grep -v '^0$' | sort -n
}