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170 lines
7.4 KiB
Markdown
170 lines
7.4 KiB
Markdown
# Powerlevel10k
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Powerlevel10k is a theme for ZSH. It's a backward-compatible fork of
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[Powerlevel9k](https://github.com/bhilburn/powerlevel9k) with lower latency and better
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prompt responsiveness.
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If you like the looks of Powerlevel9k but feeling frustrated by its slow prompt,
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simply replace your `powerlevel9k` theme with `powerlevel10k` and enjoy responsive
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shell like it's 80's again!
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Powerlevel10k uses the same configuration options as Powerlevel9k and produces the
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same results. It's simply faster. There is no catch.
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If you are on Linux or WSL, enable [gitstatus](https://github.com/romkatv/gitstatus)
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plugin for additional performance improvement in the vcs/prompt segment.
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## Table of Contents
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1. [Installation and configuration](#installation-and-configuration)
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2. [Try it in Docker](#try-it-in-docker)
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3. [How fast is it?](#how-fast-is-it)
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4. [What's the catch?](#whats-the-catch)
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## Installation and configuration
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For installation and configuration instructions see
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[Powerlevel9k](https://github.com/bhilburn/powerlevel9k). Everything in there applies to
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Powerlevel10k as well. Follow the official installation guide, make sure everything works
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and you like the way prompt looks. Then simply replace Powerlevel9k with Powerlevel10k. Once
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you restart zsh, your prompt will be faster. No configuration changes are needed.
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Manual installation:
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```zsh
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git clone https://github.com/romkatv/gitstatus.git ~/gitstatus
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git clone https://github.com/romkatv/powerlevel10k.git ~/powerlevel10k
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echo 'source ~/gitstatus/gitstatus.plugin.zsh' >>! ~/.zshrc
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echo 'source ~/powerlevel10k/powerlevel10k.zsh-theme' >>! ~/.zshrc
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```
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**Do not load both Powerlevel9k and Powerlevel10k themes at the same time. Variable name clashes
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will cause mayhem. You can source either one or the other. Consider Powerlevel10k a patched fork
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of Powerlevel9k, which it is.**
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## Try it in Docker
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Try Powerlevel10k in Docker without making any changes to your system.
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```zsh
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docker run -e LANG=C.UTF-8 -e LC_ALL=C.UTF-8 -e TERM=$TERM -it --rm ubuntu bash -c '
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set -uex
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apt update
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apt install -y zsh git
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cd
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git clone https://github.com/romkatv/gitstatus.git
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git clone https://github.com/romkatv/powerlevel10k.git
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echo "
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# Your prompt configuration goes here.
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POWERLEVEL9K_PROMPT_ON_NEWLINE=true
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POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(root_indicator dir_writable dir vcs)
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POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS=(status command_execution_time background_jobs time)
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source ~/gitstatus/gitstatus.plugin.zsh
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source ~/powerlevel10k/powerlevel10k.zsh-theme" >~/.zshrc
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cd powerlevel10k
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zsh -i'
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```
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Compare prompt responsiveness to Powerlevel9k.
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```zsh
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docker run -e LANG=C.UTF-8 -e LC_ALL=C.UTF-8 -e TERM=$TERM -it --rm ubuntu bash -c '
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set -uex
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apt update
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apt install -y zsh git
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cd
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git clone https://github.com/bhilburn/powerlevel9k.git
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echo "
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# Your prompt configuration goes here.
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POWERLEVEL9K_PROMPT_ON_NEWLINE=true
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POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(root_indicator dir_writable dir vcs)
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POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS=(status command_execution_time background_jobs time)
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source ~/powerlevel9k/powerlevel9k.zsh-theme" >~/.zshrc
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cd powerlevel9k
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zsh -i'
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```
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## How fast is it?
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Powerlevel10k with [gitstatus](https://github.com/romkatv/gitstatus) renders prompt about
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10 times faster than powerlevel9k/master (stable version) and about 5 times faster than
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powerlevel9k/next (beta version). Powerlevel10k is faster than Powerlevel9k even without
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[gitstatus](https://github.com/romkatv/gitstatus) but the difference isn't as dramatic.
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Here are benchmark results obtained with
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[zsh-prompt-benchmark](https://github.com/romkatv/zsh-prompt-benchmark) on Intel i9-7900X
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running Ubuntu 18.04.
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| Theme | / | ~/testrepo | ~/nerd-fonts | ~/linux |
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|----------------------------------|----------:|-----------:|-------------:|-----------:|
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| powerlevel9k/master | 135 ms | 207 ms | 234 ms | 326 ms |
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| powerlevel9k/next | 47 ms | 101 ms | 122 ms | 213 ms |
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| powerlevel10k | 24 ms | 82 ms | 104 ms | 197 ms |
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| **powerlevel10k with gitstatus** | **9 ms** | **11 ms** | **27 ms** | **71 ms** |
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| naked zsh | 1 ms | 1 ms | 1 ms | 1 ms |
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Columns define the current directory where the prompt was rendered.
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* `/` -- root directory, not a git repo.
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* `~/testrepo` -- a tiny git repo.
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* `~/nerd-fonts` -- [nerd-fonts](https://github.com/ryanoasis/nerd-fonts) git repo
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with 4k files.
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* `~/linux` -- [linux](https://github.com/torvalds/linux) git repo. Huge.
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Here's how the prompt looked like (identical by design in Powerlevel9k and Powerlevel 10k):
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Configuration that was used during benchmarking:
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```zsh
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POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(dir_writable dir vcs)
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POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS=(status background_jobs time custom_rprompt)
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POWERLEVEL9K_MODE=nerdfont-complete
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POWERLEVEL9K_PROMPT_ON_NEWLINE=true
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POWERLEVEL9K_CUSTOM_RPROMPT=custom_rprompt
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POWERLEVEL9K_ROOT_ICON=\\uF09CPOWERLEVEL9K_TIME_ICON=\\uF017
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POWERLEVEL9K_CUSTOM_RPROMPT_ICON=\\uF005
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POWERLEVEL9K_TIME_BACKGROUND=magenta
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POWERLEVEL9K_CUSTOM_RPROMPT_BACKGROUND=blue
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POWERLEVEL9K_STATUS_OK_BACKGROUND=grey53
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POWERLEVEL9K_BACKGROUND_JOBS_BACKGROUND=orange1
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POWERLEVEL9K_BACKGROUND_JOBS_FOREGROUND=black
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# Powerlevel10k extension to enable gitstatus. Has no effect on Powerlevel9k.
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POWERLEVEL9K_VCS_STATUS_COMMAND=gitstatus_query_dir
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function custom_rprompt() echo -E "hello world"
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```
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Here's the same benchmark for Windows Subsystem for Linux (WSL) with
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zsh running in the standard Command Prompt (`cmd.exe`).
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| Theme | / | ~/testrepo | ~/nerd-fonts | ~/linux |
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|----------------------------------|----------:|-----------:|-------------:|------------:|
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| powerlevel9k/master | 313 ms | 531 ms | 693 ms | 5898 ms |
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| powerlevel9k/next | 119 ms | 278 ms | 442 ms | 5710 ms |
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| powerlevel10k | 66 ms | 237 ms | 399 ms | 5569 ms |
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| **powerlevel10k with gitstatus** | **22 ms** | **30 ms** | **30 ms** | **5098 ms** |
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| naked zsh | 16 ms | 16 ms | 16 ms | 16 ms |
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Here Powerlevel10k with [gitstatus](https://github.com/romkatv/gitstatus) has even bigger
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advantage over Powerlevel9k and manages to render prompt with low latency.
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However, every theme failed miserably on the humongous Linux kernel repo, showing prompt latency
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over 5 seconds. This might be related to some sort of system cache that can fit indices of
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smaller repos but not of Linux kernel. To work around this problem, you can instruct
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[gitstatus](https://github.com/romkatv/gitstatus) to not scan dirty files on repos with over 4k
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files in the index (see `GITSTATUS_DIRTY_MAX_INDEX_SIZE` in
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[gitstatus docs](https://github.com/romkatv/gitstatus)). Linux kernel is the only repo in these
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benchmarks that is over this threshold. Its prompt latency goes down to 32 ms but the prompt no
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longer shows whether there are dirty (unstaged or untracked) files. It does helpfully indicate
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with the color that there _might_ be such files.
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## What's the catch?
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Really, there is no catch. It's literally the same prompt with the same flexibility
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configuration format as Powerlevel9k. But **much faster**.
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