Minimal Powerline Prompt for Zsh - p10k replacement in ~100 lines

prompt-powerline.zsh

# Minimal Powerline Prompt for Zsh
# Features: OS icon, directory, git branch, exit status
# No external dependencies

# Powerline characters
local PL_ARROW=$'\uE0B0'      #
local PL_ARROW_LEFT=$'\uE0B2' #
local PL_BRANCH=$'\uF126'     #

# Colors (matching original p10k rainbow theme)
local C_OS_FG=232      # black
local C_OS_BG=7        # white/gray
local C_DIR_FG=254     # white
local C_DIR_BG=4       # blue/cyan
local C_GIT_FG=0       # black
local C_GIT_CLEAN_BG=2 # green
local C_GIT_DIRTY_BG=3 # yellow
local C_OK_FG=2        # green
local C_ERR_FG=1       # red
local C_FRAME=240      # gray for frame chars

# Git branch (updated in precmd)
typeset -g _prompt_git_branch=""
typeset -g _prompt_git_bg=$C_GIT_CLEAN_BG

_prompt_update_git() {
    local branch
    branch=$(git symbolic-ref --short HEAD 2>/dev/null || git rev-parse --short HEAD 2>/dev/null)
    if [[ -n "$branch" ]]; then
        _prompt_git_branch="$branch"
        # Check if dirty (has uncommitted changes)
        if git diff --quiet 2>/dev/null && git diff --cached --quiet 2>/dev/null; then
            _prompt_git_bg=$C_GIT_CLEAN_BG
        else
            _prompt_git_bg=$C_GIT_DIRTY_BG
        fi
    else
        _prompt_git_branch=""
    fi
}

# Build the prompt segments
_prompt_build() {
    local left="" left_len=0
    local last_bg=""

    # Helper to add left segment
    _seg() {
        local fg=$1 bg=$2 content=$3
        if [[ -n "$last_bg" ]]; then
            left+="%F{$last_bg}%K{$bg}${PL_ARROW}%f"
            ((left_len+=1))  # arrow char
        else
            left+="%K{$bg}"
        fi
        left+="%F{$fg} ${content} %f"
        last_bg=$bg
    }

    # OS Icon segment
    _seg $C_OS_FG $C_OS_BG ""
    ((left_len+=3))  # space + icon + space

    # Directory segment
    local dir_expanded="${(%):-%(5~|%-1~/…/%3~|%~)}"
    _seg $C_DIR_FG $C_DIR_BG "$dir_expanded"
    ((left_len+=${#dir_expanded}+2))  # content + spaces

    # Git segment (if in repo)
    if [[ -n "$_prompt_git_branch" ]]; then
        _seg $C_GIT_FG $_prompt_git_bg "${PL_BRANCH} ${_prompt_git_branch}"
        ((left_len+=${#_prompt_git_branch}+4))  # icon + space + branch + spaces
    fi

    # End left prompt
    left+="%F{$last_bg}%k${PL_ARROW}%f"
    ((left_len+=1))  # final arrow

    # Frame chars add 2 to left
    ((left_len+=2))  # ╭─

    # Right side: status (4 visible chars: arrow + space + icon + space)
    local right_len=4
    local status_ok="%F{$C_OK_FG}${PL_ARROW_LEFT}%K{$C_OK_FG}%F{0} ✔ %f%k"
    local status_err="%F{$C_ERR_FG}${PL_ARROW_LEFT}%K{$C_ERR_FG}%F{255} ✘ %f%k"
    local status_seg="%(?.$status_ok.$status_err)"

    # Calculate gap fill
    local gap=$((COLUMNS - left_len - right_len))
    ((gap < 1)) && gap=1
    local fill="${(l:$gap::─:)}"

    # Build two-line prompt with frame
    PROMPT=$'\n'                           # Empty line before prompt
    PROMPT+="%F{$C_FRAME}╭─%f"             # Top-left frame
    PROMPT+="${left}"                       # Left segments
    PROMPT+="%F{$C_FRAME}${fill}%f"        # Gap fill
    PROMPT+="${status_seg}"                # Status right-aligned
    PROMPT+=$'\n'                          # Newline
    PROMPT+="%F{$C_FRAME}╰─%f"             # Bottom-left frame
    PROMPT+="%(?..%F{$C_ERR_FG})❯%f "      # Prompt char (red if error)

    RPROMPT=""
}

# Hook to update prompt before each command
_prompt_precmd() {
    _prompt_update_git
    _prompt_build
}

# Register the hook
autoload -Uz add-zsh-hook
add-zsh-hook precmd _prompt_precmd

# Initial build
_prompt_precmd