git-prompt.sh

# a version of __git_ps1 that should show the current branch quickly without many git commands

function __git_ps1() {
    local path="$(git rev-parse --show-toplevel)/.git";
    local branch="$(cat ${P}HEAD | sed -re 's/.+\///g')";

    if [[ -d "$path/rebase-merge/" ]]; then
        if [[ -f "$path/rebase-merge/interactive" ]]; then
            B="$branch|MERGING-i";
        else
            B="$branch|MERGING-m";
        fi
    else
        if [ -d "$path/rebase-apply" ]; then
            if [ -f "$path/rebase-apply/rebasing" ]; then
                B="$branch|REBASE"
            elif [ -f "$path/rebase-apply/applying" ]; then
                B="$branch|AM"
            else
                B="$branch|AM/REBASE"
            fi
        elif [ -f "$path/MERGE_HEAD" ]; then
            B="$branch|MERGING"
        elif [ -f "$path/CHERRY_PICK_HEAD" ]; then
            B="$branch|CHERRY-PICKING"
        elif [ -f "$path/REVERT_HEAD" ]; then
            B="$branch|REVERTING"
        elif [ -f "$path/BISECT_LOG" ]; then
            B="$branch|BISECTING"
        fi
    fi
}