Estimate git repository working hours by adding time between commits (for a given optional author)

git-hours.sh

#!/bin/bash


# Estimate repository working hours by adding time between commits.
# If diference between two commits is larger than THRESHOLD, PRECOMMIT_TIME is used instead.

# 2016-06-06 luismrsilva
# (c) 2016 by Luís Silva.
# Disclamer: use at your own risk.


# First argument: optional commit author. (see man git-log, --author=<pattern>)
AUTHOR_PATTERN=$1

### Config ###

# Time (seconds) to add when diff exceeds threshold
PRECOMMIT_TIME=3600

# Ignore diff > than this (seconds):
THRESHOLD=$((5*3600))

### --- ###


COMMIT_COUNT=0
TOTAL=0
IGNORED=0
LINES=$(git log --author="$AUTHOR_PATTERN" --format="%at" --reverse | sort)
for l in $LINES; do
	TIME=$((l-LAST))

	# Show the commit date
	echo -n $(date +%c -d@${l})
	echo -ne "\t"
	echo -ne $TIME "\t\t~" $((TIME/60/60))h
	if [ $TIME -lt $THRESHOLD ]; then
		echo
		TOTAL=$((TOTAL+TIME))
	else
		echo -e "\t(ignoring)"
		IGNORED=$((IGNORED+1))
	fi
	LAST=$l
	COMMIT_COUNT=$((COMMIT_COUNT+1))
done

echo "======"

if [ "$AUTHOR_PATTERN" = "" ]; then
	echo "Considering all $COMMIT_COUNT commits."
else
	echo "Considering $COMMIT_COUNT commits for author with pattern \"$AUTHOR_PATTERN\"."
fi

echo "======"
echo "In seconds: $TOTAL"
echo "In hours: " $((TOTAL/60/60))
echo "# ignored: $IGNORED"
echo "Grand total in hours: " $(((TOTAL + IGNORED*PRECOMMIT_TIME)/60/60))