clockout.bash

#!/bin/bash

test_dependency () {
    if ! [ -x "$(command -v $1)" ]; then
        echo "Error: $1 is not installed." >&2
        exit 1
    fi
}
test_dependency "bc"
test_dependency "units"

# Test input file
if [ "$1" = "" ]; then
    echo "Error: no input file provided" >&2
    exit 1
fi
while read -r line
do
    if ! echo "$line" | egrep -q '^\S+\s+(2[0-3]|[0-1][0-9]):[0-5][0-9]\s+(2[0-3]|[0-1][0-9]):[0-5][0-9](\s.*)?$'; then
        echo -e "Error: input file has incorrect format on line:\n$line" >&2
        exit 1
    fi
done < "$1"

# Clockout
TOTAL=0
PREVIOUS_STORY=""
PREVIOUS_DURATION=0
SUBTOTAL=0
DATA=$(sort "$1")
DATA+="\n"
echo -e "$DATA" | { while read line
do
    STORY=$(echo $line | awk '{print $1}')
    FROM=$(echo $line | awk '{print $2}')
    TO=$(echo $line | awk '{print $3}')
    COMMENT=$(echo -e $line | sed -E 's/\s+/ /g' | cut --delimiter=' ' --fields=1,2,3 --complement)
    FROM_EPOCH=$(date +%s --date=$FROM)
    TO_EPOCH=$(date +%s --date=$TO)
    DURATION=$(echo "($TO_EPOCH - $FROM_EPOCH) / 60.0" | bc)
    TOTAL=$(echo "$TOTAL + $DURATION" | bc)
    if [ "$STORY" = "$PREVIOUS_STORY" ]; then
        SUBTOTAL=$(echo "$SUBTOTAL + $DURATION" | bc)
    else
        if [ $SUBTOTAL -gt $PREVIOUS_DURATION ]; then
            echo -e "└ Subtotal: $SUBTOTAL"
        fi
        if [ "$PREVIOUS_STORY" != "" ]; then
            echo
        fi
        SUBTOTAL=$DURATION
    fi
    if [ "$line" != "" ]; then
        echo -e "$STORY\t\t\t\t$FROM\t$TO\t$DURATION\t$COMMENT"
    fi
    PREVIOUS_STORY=$STORY
    PREVIOUS_DURATION=$DURATION
done
echo -e "Total: $(units "$TOTAL minutes" time)"
}