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229 lines
9.3 KiB
Markdown
229 lines
9.3 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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## Table of Contents
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1. [Installation and configuration](#installation-and-configuration)
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1. [Manual installation](#manual-installation)
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2. [Extra configuration](#extra-configuration)
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2. [Try it out](#try-it-out)
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1. [For Powerlevel9k users](#for-powerlevel9k-users)
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2. [For new users](#for-new-users)
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3. [Docker playground](#docker-playground)
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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/powerlevel10k.git ~/powerlevel10k
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echo 'source ~/powerlevel10k/powerlevel10k.zsh-theme' >>! ~/.zshrc
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```
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Make sure to disable your current theme.
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### Extra configuration
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Powerlevel10k has a handful of configuration options that Powerlevel9k doesn't have. They
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are still using the `POWERLEVEL9K` prefix though.
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* `POWERLEVEL9K_VCS_MAX_SYNC_LATENCY_SECONDS (FLOAT) [default=0.05]`
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If it takes longer than this to fetch git repo status, display the prompt with a greyed out
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vcs segment and fix it asynchronously when the results come it.
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* `POWERLEVEL9K_VCS_BACKENDS (ARRAY) [default=(git)]`
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The list of VCS backends to use. Supported values are `git`, `svn` and `hg`. Note that adding
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anything other than git will make prompt slower even when your current directory isn't a repo.
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* `POWERLEVEL9K_GITSTATUS_DIR (STRING) [default=$POWERLEVEL9K_INSTALLATION_DIR/gitstatus]`
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Directory with gitstatus plugin. By default uses a copy bundled with Powerlevel10k.
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* `POWERLEVEL9K_DISABLE_GITSTATUS (STRING) [default="false"]`
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If set to `"true"`, Powerlevel10k won't use its fast git backend and will fall back to
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`vcs_info` like Powerlevel9k.
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* `POWERLEVEL9K_MAX_CACHE_SIZE (INT) [default=10000]`
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The maximum number of elements that can be stored in the cache. When the cache grows over this
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limit, it gets cleared.
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* `POWERLEVEL9K_VCS_MAX_INDEX_SIZE_DIRTY (INT) [default=-1]`
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Don't scan for dirty files in git repos with more files in the index than this. Instead, show
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them with the "dirty" color (yellow by default) whether they are dirty or not. This makes git
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prompt much faster on huge repositories.
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## Try it out
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Try Powerlevel10k without making any changes to your setup. If you like it, see
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[Installation and configuration](#installation-and-configuration) for how to make a permanent
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switch.
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### For Powerlevel9k users
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If you are currently using Powerlevel9k, you can try Powerlevel10k in a temporary zsh shell. The
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prompt will look exactly like what you are used to but it'll be faster.
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```zsh
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git clone https://github.com/romkatv/powerlevel10k.git /tmp/powerlevel10k
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source /tmp/powerlevel10k/powerlevel10k.zsh-theme
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```
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When you are done playing, `rm -rf /tmp/powerlevel10k` and exit zsh.
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### For new users
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```zsh
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git clone https://github.com/romkatv/powerlevel10k.git /tmp/powerlevel10k
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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 /tmp/powerlevel10k/powerlevel10k.zsh-theme" >/tmp/powerlevel10k/.zshrc
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ZDOTDIR=/tmp/powerlevel10k zsh
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```
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When you are done playing, `rm -rf /tmp/powerlevel10k` and exit zsh.
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### Docker playground
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You can try Powerlevel10k in Docker (Linux only). Once you exit zsh, the image is deleted.
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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/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 ~/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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## How fast is it?
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Powerlevel10k renders prompt about 50 times faster than powerlevel9k/master (stable version) and
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about 15 times faster than powerlevel9k/next (beta version).
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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 | / | ~/nerd-fonts |
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|---------------------|----------:|-------------:|
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| powerlevel9k/master | 135 ms | 233 ms |
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| powerlevel9k/next | 27 ms | 107 ms |
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| **powerlevel10k** | **2 ms** | **6 ms** |
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| naked zsh | 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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* `~/nerd-fonts` -- [nerd-fonts](https://github.com/ryanoasis/nerd-fonts) git repo
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with 4k files.
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Here's how the prompt looked like during benchmarking.
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It was identical in Powerlevel10k and Powerlevel9k. Even though Powerlevel10k can dynamically
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switch to async prompts, it wasn't happening here because latencies were low. Prompts with both
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themes were essentially synchronous with every prompt having up-to-date git info.
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_This table used to have another column for Linux kernel git repo, which is massive. It's
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been removed because it's not a fair comparison. Powerlevel10k automatically detects that
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fetching git status is slow and switches to async prompt generation, which allows it to
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achieve 2 ms prompt latency but not all its prompt have up-to-date git info. Those that don't,
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have vcs segment greyed out._
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Configuration that was used:
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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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function custom_rprompt() echo -E "hello world"
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sleep 86400 & # spawn two background jobs
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sleep 86400 &
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```
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Here's the same benchmark for Windows Subsystem for Linux (WSL) with zsh running in the standard
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Command Prompt (`cmd.exe`).
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| Theme | / | ~/nerd-fonts |
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|---------------------|----------:|-------------:|
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| powerlevel9k/master | 313 ms | 693 ms |
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| powerlevel9k/next | 119 ms | 442 ms |
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| **powerlevel10k** | **16 ms** | **19 ms** |
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| naked zsh | 16 ms | 16 ms |
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The fastests results are probably limited by the key repeat rate.
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Here's Raspberry Pie 3. I replaced [nerd-fonts](https://github.com/ryanoasis/nerd-fonts) repo with
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[git](https://github.com/git/git) in this benchmark becase the former didn't fit on my SD card.
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Git repo had 3.6k files, so about the same size. I set `POWERLEVEL9K_VCS_MAX_SYNC_LATENCY_SECONDS=1`
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to prevent Powerlevel10k from switching to async prompts. The default threshold is 0.05, or 50 ms,
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after which Powerlevel10k will go async (git latency in ~/git was close to 100 ms, so above the
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default 50 ms). Naturally, async is a good thing, so you shouldn't disable it in your configs. I
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only did it to measure sync latency.
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| Theme | / | ~/git |
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|---------------------|----------:|-----------:|
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| powerlevel9k/master | 312 ms | 584 ms |
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| **powerlevel10k** | **15 ms** | **108 ms** |
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| naked zsh | 1 ms | 1 ms |
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The `next` branch of Powerlevel9k didn't work on Raspberry Pie, so I couldn't benchmark it.
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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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If you really need to know, here's where Powerlevel10k differs from Powerlevel9k:
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* Git prompt doesn't show tags and revisions. Open an issue if you need them.
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* By default only git vcs backend is enabled. If you need svn and hg, you'll need to set
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`POWERLEVEL9K_VCS_BACKENDS`. See [Extra configuration](#extra-configuration).
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* Fewer configuration options can be changed after the theme is loaded. For example, if you
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decide to change background color of some segment in the middle of an interactive session,
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it may not work.
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