display-error

#!/usr/bin/env bash

DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
LOG="$DIR/../var/log/exception.log"

DATETIME_REGEX='\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}[+\-]\d{2}:\d{2}'
ERROR_OFFSET=0

NEXT_WORD_STORE=
for WORD in "$@"
do
    if [ -z "$NEXT_WORD_STORE" ]
    then
        if [[ "$WORD" == "-i" ]]
        then
            NEXT_WORD_STORE=ERROR_OFFSET
        fi
    else
        eval $NEXT_WORD_STORE="$WORD"
        NEXT_WORD_STORE=
    fi
done

if [ -f "$LOG" ]
then
    HEADER_LINE_NUMBERS="$(egrep -n "^${DATETIME_REGEX} ERR" "$LOG" | cut -f1 -d: | tail -n $(($ERROR_OFFSET + 1)))"
    if [ -z "$HEADER_LINE_NUMBERS" ]
    then
        exit 1
    fi

    if (( $ERROR_OFFSET == 0 ))
    then
        ERROR="$(awk "NR >= $HEADER_LINE_NUMBERS" "$LOG")"
    else
        START_LINE=$(echo "$HEADER_LINE_NUMBERS" | head -n 1)
        END_LINE=$(echo "$HEADER_LINE_NUMBERS" | head -n 2 | tail -n 1)

        ERROR="$(awk "NR >= $START_LINE && NR < $END_LINE" "$LOG")"
    fi

    echo "$ERROR" | head -n 2

    printf "\e[1;30m"
    echo "$ERROR" | tail -n +3
    printf "\e[0m"
fi