reviewprev git

alias gdiff='git diff -C -l10 --src-prefix="[pre-change] " --dst-prefix="[pos-change] "'
alias ggdiff='git difftool --dir-diff'

# .gitconfig:
# lgs =!git --no-pager log --left-right --graph --abbrev-commit --date=relative -n 20 --pretty='%C(green)%-h%Creset %C(cyan)%><(30,trunc)%an%Creset %C(green)%><(18,trunc)%cd%Creset %C(white)%s%Creset'

function glg {
    fillheight=$(echo $(trows) - 2 |bc)
    fillwidth=$(echo $(tcolumns) - 36 |bc)

    if [[ $1 =~ ^[0-9]+$ ]]
    then
        typeset lines=$1
        shift
    else
        typeset lines=$fillheight
    fi

    hashes="%C(yellow)%d%Creset %C(green)%-h%Creset"
    msg="%C(white)%<|($fillwidth,trunc)%s%Creset"
    date="%C(green)%><(18,trunc)%cd%Creset"
    author="%C(cyan)%<(14,trunc)%an%Creset"

    git --no-pager \
    log --left-right --graph --abbrev-commit --date=relative -n $lines \
    --pretty="$hashes $msg $date $author" "$@"
}

function gdiffgeneric {
    typeset specific_log=$1; shift
    typeset lines=$(echo -e "$gitlog" | wc -l | tr -d ' ')

    if [ "$lines" -gt 0 ] ;then
        typeset begin_hash=$(echo -e "$gitlog" | head -n$first_pointer | tail -n1)
        typeset end_hash=$begin_hash~

        # first commit
        git show $end_hash &>/dev/null
        if [ $? -eq 128 ] # error finding hash
        then
            echo "Initial commit found"
            typeset initial_commit=true
        fi

        # [ "$lines" == 1 ] || typeset end_hash=$(echo -e "$gitlog" | head -n$last_pointer | tail -n1)
        # eval "$specific_log" ; echo # err.
        eval "git lgs -n1 -C -l10 --summary --stat $begin_hash $path"
        # [[ $initial_commit == true ]] || git diff --stat $end_hash $begin_hash
        read -n 1 -p "[d=CLI diff] ; [enter=GUI diff] ; [any other char=skip] ; [ctrl+c=finish]..." readchar
    else
        echo "No commits found"
        return 1
    fi

    if [[ $readchar == 'd' ]]; then
        echo -e "\n<<<>>>"
        if [[ $initial_commit == true ]]; then 
            git show --oneline $begin_hash
            return 1
        fi
        gdiff --ignore-all-space $end_hash $begin_hash $path
    elif ! [[ $readchar == '' ]] ; then
        echo -e "\nSkipped."
    else 
        if [[ $initial_commit == true ]]; then 
            git show --oneline $begin_hash
            return 1
        fi
        # ggdiff -y $end_hash $begin_hash $path
        ggdiff -y $end_hash $begin_hash $path
    fi
}

function gdiffprev {
    typeset first_pointer=$1; shift
    typeset last_pointer=$(($first_pointer + 1))
    typeset path="$@"
    typeset gitlog=$(git log --pretty=%h $path)
    gdiffgeneric "glg 20 $path"
}

function reviewprev {
    # reviewprev 5
    typeset number="$1"
    [ -z $number ] && number=1

    glg "$number"
    for i in $(seq $number 1); do
        hr && echo -e "Previous n.$i:"
        gdiffprev "$i"
    done
}