mirror of
https://github.com/denisidoro/navi
synced 2024-11-22 19:43:06 +00:00
240 lines
8.8 KiB
Markdown
240 lines
8.8 KiB
Markdown
# navi <img src="https://user-images.githubusercontent.com/3226564/65362934-b4432500-dbdf-11e9-8f75-815fbc5cbf8f.png" alt="icon" height="28px"/> [](https://github.com/denisidoro/navi/actions) 
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> :information_source: This project has recently been rewritten in Rust. The old implementation was written in bash. If you're facing any issue after updating, please check [this thread](https://github.com/denisidoro/navi/issues/201).
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An interactive cheatsheet tool for the command-line so that you won't say the following anymore:
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>— *How to run that command again?*<br>
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— *Oh, it's not in my shell history*<br>
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— *Geez, it's almost what I wanted but I need to change some args*
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**navi** allows you to browse through cheatsheets (that you may write yourself or download from maintainers) and execute commands, with argument values prompted to you.
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Table of contents
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-----------------
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* [Installation](#installation)
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* [Using Homebrew or Linuxbrew](#using-homebrew-or-linuxbrew)
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* [Downloading pre-compiled binaries](#downloading-pre-compiled-binaries)
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* [Building from source](#building-from-source)
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* [Upgrading](#upgrading)
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* [Usage](#usage)
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* [Preventing execution](#preventing-execution)
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* [Pre-filtering](#pre-filtering)
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* [Searching online repositories](#searching-online-repositories)
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* [Shell widget](#shell-widget)
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* [More options](#more-options)
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* [Trying out online](#trying-out-online)
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* [Motivation](#motivation)
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* [Cheatsheets](#cheatsheets)
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* [Using your own custom cheatsheets](#using-your-own-custom-cheatsheets)
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* [Submitting cheatsheets](#submitting-cheatsheets)
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* [Cheatsheet syntax](#cheatsheet-syntax)
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* [Syntax overview](#syntax-overview)
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* [Variables](#variables)
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* [Variable options](#variable-options)
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* [Table formatting](#table-formatting)
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* [Multiple choice](#multiple-choice)
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* [List customization](#list-customization)
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* [Related projects](#related-projects)
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* [Etymology](#etymology)
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Installation
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------------
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### Using Homebrew or Linuxbrew
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You can use [Homebrew](http://brew.sh/) or [Linuxbrew](http://linuxbrew.sh/)
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to install **navi**:
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```sh
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brew install navi
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```
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### Downloading pre-compiled binaries
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```bash
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bash <(curl -sL https://github.com/denisidoro/navi/blob/master/scripts/install)
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```
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Alternatively, you can download the binaries manually [here](https://github.com/denisidoro/navi/releases/latest).
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### Building from source
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```bash
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git clone https://github.com/denisidoro/navi ~/.navi
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cd ~/.navi
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make install
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```
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Usage
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-----
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By simply running `navi` you will be prompted with the default cheatsheets.
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### Preventing execution
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If you run `navi --print`, the selected snippet won't be executed. It will be printed to stdout instead.
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### Pre-filtering
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If you run `navi query <cmd>`, the results will be pre-filtered.
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### Searching online repositories
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If you run `navi search <cmd>`, **navi** will try to download cheatsheets from online repositories as well.
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Please note that these cheatsheets aren't curated by **navi**'s maintainers and should be taken with a grain of salt. If you're not sure about executing these snippets, make sure to check the preview window or use the `--print` option.
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### Shell widget
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You can use **navi** as a widget to your shell. This way, your history is correctly populated and you can edit the command as you wish before executing it.
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In order to use it, add this line to your `.bashrc`-like file:
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```sh
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# bash
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source "$(navi widget bash)"
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# zsh
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source "$(navi widget zsh)"
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# fish
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source (navi widget fish)
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```
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By default, `Ctrl+G` is assigned to launching **navi**. If you want to change the keybinding, replace the argument of `bind` or `bindkey` in [the widget file](https://github.com/denisidoro/navi/search?q=filename%3Anavi.plugin.*&unscoped_q=filename%3Anavi.plugin.*).
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If you want a widget for other shells, please upvote [this issue](https://github.com/denisidoro/navi/issues/37).
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### More options
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Please refer to `navi --help` for more details.
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Trying out online
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--------------------
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If you don't have access to bash at the moment and you want to live preview **navi**, head to [this playground](https://www.katacoda.com/denisidoro/scenarios/navi). It'll start a docker container with instructions for you to install and use the tool. Note: login required.
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Motivation
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----------
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The main objectives are:
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- to increase discoverability, by finding snippets given keywords or descriptions;
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- to prevent you from running auxiliar commands, copying the result into the clipboard and then pasting into the original command;
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- to easily share one-liners with others so that they don't need to figure out how to write the commands;
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- to improve terminal usage as a whole.
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Sure, you can find autocompleters out there for all your favorite commands. However, they are very specific and each one may offer a different learning curve.
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Or you can launch a browser and search for instructions on Google, but that takes some time.
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**navi**, on the other hand, intends to be a general purpose platform for bookmarking any snippet at a very low cost.
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Cheatsheets
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-----------
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### Using your own custom cheatsheets
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In this case, you need to pass a `:`-separated list of separated directories which contain `.cheat` files:
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```sh
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navi --path "/folder/with/cheats"
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```
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Alternatively, you can set an environment variable in your `.bashrc`-like file:
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```sh
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export NAVI_PATH="/folder/with/cheats:/another/folder"
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```
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### Submitting cheatsheets
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Feel free to fork this project and open a PR for me to include your contributions.
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Cheatsheet syntax
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-----------------
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Cheatsheets are described in `.cheat` files.
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### Syntax overview
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- lines starting with `%` should contain tags which will be added to any command in a given file;
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- lines starting with `#` should be descriptions of commands;
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- lines starting with `$` should contain commands that generate a list of possible values for a given argument;
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- all the other non-empty lines are considered as executable commands.
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For example, this is a valid `.cheat` file:
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```sh
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% git, code
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# Change branch
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git checkout <branch>
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$ branch: git branch | awk '{print $NF}'
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```
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### Variables
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The interface prompts for variable names inside brackets (eg `<branch>`).
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Variable names should only include alphanumeric characters and `_`.
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The command for generating possible inputs can refer other variables:
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```sh
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# If you select 2 for x, the possible values of y will be 12 and 22
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echo <x> <y>
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$ x: echo -e '1\n2\n3'
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$ y: echo -e "$((x+10))\n$((x+20))"
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```
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### Variable options
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For lines starting with `$` you can add extra options using `---`.
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#### Table formatting
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You can pick a specific column of a selection and set the number of lines considered as headers via `--column` and `--headers`:
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```sh
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# This will pick the 3rd column and use the first line as header
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docker rmi <image_id>
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$ image_id: docker images --- --column 3 --headers 1
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```
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#### Multiple choice
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You can select multiple values via `--multi` and hitting `<TAB>`:
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```sh
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# The resulting command will be something like: cat "a.txt" "b.txt"
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cat <files>
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$ files: ls --- --multi true
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```
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List customization
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------------------
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Lists can be stylized with the [$FZF_DEFAULT_OPTS](https://github.com/junegunn/fzf) environment variable. This way, you can change the [color scheme](https://github.com/junegunn/fzf/wiki/Color-schemes), for example.
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In addition:
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- the `--fzf-overrides` option allows you to hide columns, for example
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- the `--col-widths` option allows you to limit column widths
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Please refer to `navi --help` for more details.
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Related projects
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----------------
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There are many similar projects out there ([bro](https://github.com/hubsmoke/bro), [eg](https://github.com/srsudar/eg), [cheat.sh](https://github.com/chubin/cheat.sh), [tldr](https://github.com/tldr-pages/tldr), [cmdmenu](https://github.com/amacfie/cmdmenu), [cheat](https://github.com/cheat/cheat), [beavr](https://github.com/denisidoro/beavr), [how2](https://github.com/santinic/how2) and [howdoi](https://github.com/gleitz/howdoi), to name a few).
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Most of them provide excellent cheatsheet repositories, but lack a nice UI and argument suggestions.
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In any case, **navi** has the option to [search for some of these repositories](#searching-online-repositories).
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Etymology
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---------
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In [The Legend of Zelda Ocarina of Time](https://zelda.gamepedia.com/Ocarina_of_Time), [navi](https://zelda.gamepedia.com/Navi) is a character that provides [Link](https://zelda.gamepedia.com/Link) with a variety of clues to help him solve puzzles and progress in his quest.
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