git-recent-refs

#!/usr/bin/env bash
# Usage: git-recent-refs [N|pattern]

set -o pipefail

local_only=false

if [[ "$1" == "--local" || "$1" == "-l" ]]; then
    local_only=true
    shift
fi

ref_root="refs"
if [[ "$local_only" == true ]]; then
    ref_root="refs/heads"
fi

mapfile -t all_recent_branches < <(
    git for-each-ref --sort=-committerdate "$ref_root" | awk '
        /refs\/.*(HEAD|master)$/{next}
        {
            gsub("refs/(remotes/[^/]+|tags|heads)/", "")
            if (!a[$3]++) print $3
        }'
)

if [[ -z "$1" || "$1" =~ ^[0-9]+$ ]]; then
    limit=${1:-25}
    select_branches=("${all_recent_branches[@]:0:limit}")
else
    select_branches=()
    needle=${1,,}
    for b in "${all_recent_branches[@]}"; do
        if [[ "${b,,}" == *"$needle"* ]]; then
            select_branches+=("$b")
        fi
    done
fi

if ((${#select_branches[@]} == 0)); then
    echo "No matching branches found" >&2
    exit 1
fi

if command -v fzf >/dev/null 2>&1; then
    branch=$(
        printf '%s\n' "${select_branches[@]}" |
        fzf --prompt='Checkout branch: ' --height=40% --reverse
    )

    if [[ -n "$branch" ]]; then
        git checkout "$branch"
        exit $?
    else
        exit 1
    fi
else
    PS3='Checkout branch: '
    select branch in "${select_branches[@]}"; do
        if [[ -n "$branch" ]]; then
            git checkout "$branch"
            exit $?
        else
            echo "Invalid selection" >&2
        fi
    done
fi