git-brv

#!/usr/bin/env bash
# A sorted prettier branch -vv
# Based on https://github.com/tj/git-extras/blob/master/bin/git-brv

set -eEu -o pipefail
IFS=$'\n\t'
PS4='+\t '

error_handler() { echo "Error: Line ${1} exited with status ${2}"; }
trap 'error_handler ${LINENO} $?' ERR

[[ "${TRACE:-0}" == "1" ]] && set -x


if ! (( BASH_VERSINFO[0] > 4 ||
        BASH_VERSINFO[0] == 4 && BASH_VERSINFO[1] >= 2 )); then
    printf >&2 'This script requires bash 4.2 or newer\n'
    exit 1
fi

if [[ -t 1 ]]; then
    shopt -s checkwinsize
    COLUMNS=$(tput cols)
    color_branch_local=$(git config --get-color color.branch.local normal)
    color_branch_current=$(git config --get-color color.branch.current green)
    color_diff_commit=$(git config --get-color color.diff.commit yellow)
    color_branch_upstream=$(git config --get-color color.branch.upstream blue)
    reset=$(tput sgr0)
fi


declare -A upstream date hash message
eval "$(
    git for-each-ref --format='upstream[%(refname:short)]=%(upstream:short)' \
                     --shell 'refs/heads/**'
)"

for b in "${!upstream[@]}"; do
    blen=${#b} bwidth=0 ulen=${#upstream[$b]} uwidth=0
    bwidth=$(( blen > bwidth ? blen : bwidth ))
    uwidth=$(( ulen > uwidth ? ulen : uwidth ))
    IFS=/ read -r 'date[$b]' 'hash[$b]' 'message[$b]' < <(
        git log --no-walk=unsorted --format=%ct/%h/%s "$b" --
    )
    hlen=${#hash[$b]} hwidth=0
    hwidth=$(( hlen > hwidth ? hlen : hwidth ))
done

mapfile -t ordered < <(
    for b in "${!date[@]}"; do
        printf '%d\t%s\n' "${date[$b]}" "$b"
    done | sort -rn | cut -f2-
)

current=$(git symbolic-ref -q --short HEAD)

for b in "${ordered[@]}"; do
    branch_color=$color_branch_local
    if [[ $b = "$current" ]]; then
        branch_color=$color_branch_current
    fi
    if [[ -t 1 ]]; then
        msg=${message[$b]:0:COLUMNS-bwidth-uwidth-hwidth-14}
    else
        msg=${message[$b]}
    fi
    printf '%(%Y-%m-%d)T %s%*s%s %s%*s%s %s%*s%s %s\n' \
           "${date[$b]}" \
           "$branch_color" "-$bwidth" "$b" "$reset" \
           "$color_branch_upstream" "-$uwidth" "${upstream[$b]}" "$reset" \
           "$color_diff_commit" "-$hwidth" "${hash[$b]}" "$reset" \
           "$msg"
done