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189 lines
10 KiB
Markdown
189 lines
10 KiB
Markdown
# zsh-autosuggestions
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_[Fish](http://fishshell.com/)-like fast/unobtrusive autosuggestions for zsh._
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It suggests commands as you type based on history and completions.
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Requirements: Zsh v4.3.11 or later
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[](https://gitter.im/zsh-users/zsh-autosuggestions)
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<a href="https://asciinema.org/a/37390" target="_blank"><img src="https://asciinema.org/a/37390.png" width="400" /></a>
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## Installation
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See [INSTALL.md](INSTALL.md).
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## Usage
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As you type commands, you will see a completion offered after the cursor in a muted gray color. This color can be changed by setting the `ZSH_AUTOSUGGEST_HIGHLIGHT_STYLE` variable. See [configuration](#configuration).
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If you press the <kbd>→</kbd> key (`forward-char` widget) or <kbd>End</kbd> (`end-of-line` widget) with the cursor at the end of the buffer, it will accept the suggestion, replacing the contents of the command line buffer with the suggestion.
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If you invoke the `forward-word` widget, it will partially accept the suggestion up to the point that the cursor moves to.
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## Configuration
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You may want to override the default global config variables. Default values of these variables can be found [here](src/config.zsh).
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**Note:** If you are using Oh My Zsh, you can put this configuration in a file in the `$ZSH_CUSTOM` directory. See their comments on [overriding internals](https://github.com/robbyrussell/oh-my-zsh/wiki/Customization#overriding-internals).
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### Suggestion Highlight Style
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Set `ZSH_AUTOSUGGEST_HIGHLIGHT_STYLE` to configure the style that the suggestion is shown with. The default is `fg=8`, which will set the foreground color to color 8 from the [256-color palette](https://upload.wikimedia.org/wikipedia/commons/1/15/Xterm_256color_chart.svg). If your terminal only supports 8 colors, you will need to use a number between 0 and 7.
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Background color can also be set, and the suggestion can be styled bold, underlined, or standout. For example, this would show suggestions with bold, underlined, pink text on a cyan background:
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```sh
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ZSH_AUTOSUGGEST_HIGHLIGHT_STYLE="fg=#ff00ff,bg=cyan,bold,underline"
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```
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For more info, read the Character Highlighting section of the zsh manual: `man zshzle` or [online](http://zsh.sourceforge.net/Doc/Release/Zsh-Line-Editor.html#Character-Highlighting).
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**Note:** Some iTerm2 users have reported [not being able to see the suggestions](https://github.com/zsh-users/zsh-autosuggestions/issues/416#issuecomment-486516333). If this affects you, the problem is likely caused by incorrect color settings. In order to correct this, go into iTerm2's setting, navigate to profile > colors and make sure that the colors for Basic Colors > Background and ANSI Colors > Bright Black are **different**.
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### Suggestion Strategy
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`ZSH_AUTOSUGGEST_STRATEGY` is an array that specifies how suggestions should be generated. The strategies in the array are tried successively until a suggestion is found. There are currently three built-in strategies to choose from:
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- `history`: Chooses the most recent match from history.
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- `completion`: Chooses a suggestion based on what tab-completion would suggest. (requires `zpty` module, which is included with zsh since 4.0.1)
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- `match_prev_cmd`: Like `history`, but chooses the most recent match whose preceding history item matches the most recently executed command ([more info](src/strategies/match_prev_cmd.zsh)). Note that this strategy won't work as expected with ZSH options that don't preserve the history order such as `HIST_IGNORE_ALL_DUPS` or `HIST_EXPIRE_DUPS_FIRST`.
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For example, setting `ZSH_AUTOSUGGEST_STRATEGY=(history completion)` will first try to find a suggestion from your history, but, if it can't find a match, will find a suggestion from the completion engine.
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### Widget Mapping
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This plugin works by triggering custom behavior when certain [zle widgets](http://zsh.sourceforge.net/Doc/Release/Zsh-Line-Editor.html#Zle-Widgets) are invoked. You can add and remove widgets from these arrays to change the behavior of this plugin:
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- `ZSH_AUTOSUGGEST_CLEAR_WIDGETS`: Widgets in this array will clear the suggestion when invoked.
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- `ZSH_AUTOSUGGEST_ACCEPT_WIDGETS`: Widgets in this array will accept the suggestion when invoked.
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- `ZSH_AUTOSUGGEST_EXECUTE_WIDGETS`: Widgets in this array will execute the suggestion when invoked.
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- `ZSH_AUTOSUGGEST_PARTIAL_ACCEPT_WIDGETS`: Widgets in this array will partially accept the suggestion when invoked.
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- `ZSH_AUTOSUGGEST_IGNORE_WIDGETS`: Widgets in this array will not trigger any custom behavior.
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Widgets that modify the buffer and are not found in any of these arrays will fetch a new suggestion after they are invoked.
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**Note:** A widget shouldn't belong to more than one of the above arrays.
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### Disabling suggestion for large buffers
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Set `ZSH_AUTOSUGGEST_BUFFER_MAX_SIZE` to an integer value to disable autosuggestion for large buffers. The default is unset, which means that autosuggestion will be tried for any buffer size. Recommended value is 20.
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This can be useful when pasting large amount of text in the terminal, to avoid triggering autosuggestion for strings that are too long.
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### Asynchronous Mode
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Suggestions are fetched asynchronously by default in zsh versions 5.0.8 and greater. To disable asynchronous suggestions and fetch them synchronously instead, `unset ZSH_AUTOSUGGEST_USE_ASYNC` after sourcing the plugin.
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Alternatively, if you are using a version of zsh older than 5.0.8 and want to enable asynchronous mode, set the `ZSH_AUTOSUGGEST_USE_ASYNC` variable after sourcing the plugin (it can be set to anything). Note that there is [a bug](https://github.com/zsh-users/zsh-autosuggestions/issues/364#issuecomment-481423232) in versions of zsh older than 5.0.8 where <kbd>ctrl</kbd> + <kbd>c</kbd> will fail to reset the prompt immediately after fetching a suggestion asynchronously.
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### Disabling automatic widget re-binding
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Set `ZSH_AUTOSUGGEST_MANUAL_REBIND` (it can be set to anything) to disable automatic widget re-binding on each precmd. This can be a big boost to performance, but you'll need to handle re-binding yourself if any of the widget lists change or if you or another plugin wrap any of the autosuggest widgets. To re-bind widgets, run `_zsh_autosuggest_bind_widgets`.
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### Ignoring history suggestions that match a pattern
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Set `ZSH_AUTOSUGGEST_HISTORY_IGNORE` to a [glob pattern](http://zsh.sourceforge.net/Doc/Release/Expansion.html#Glob-Operators) to prevent offering suggestions for history entries that match the pattern. For example, set it to `"cd *"` to never suggest any `cd` commands from history. Or set to `"?(#c50,)"` to never suggest anything 50 characters or longer.
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**Note:** This only affects the `history` and `match_prev_cmd` suggestion strategies.
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### Skipping completion suggestions for certain cases
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Set `ZSH_AUTOSUGGEST_COMPLETION_IGNORE` to a [glob pattern](http://zsh.sourceforge.net/Doc/Release/Expansion.html#Glob-Operators) to prevent offering completion suggestions when the buffer matches that pattern. For example, set it to `"git *"` to disable completion suggestions for git subcommands.
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**Note:** This only affects the `completion` suggestion strategy.
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### Key Bindings
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This plugin provides a few widgets that you can use with `bindkey`:
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1. `autosuggest-accept`: Accepts the current suggestion.
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2. `autosuggest-execute`: Accepts and executes the current suggestion.
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3. `autosuggest-clear`: Clears the current suggestion.
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4. `autosuggest-fetch`: Fetches a suggestion (works even when suggestions are disabled).
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5. `autosuggest-disable`: Disables suggestions.
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6. `autosuggest-enable`: Re-enables suggestions.
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7. `autosuggest-toggle`: Toggles between enabled/disabled suggestions.
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For example, this would bind <kbd>ctrl</kbd> + <kbd>space</kbd> to accept the current suggestion.
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```sh
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bindkey '^ ' autosuggest-accept
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```
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## Troubleshooting
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If you have a problem, please search through [the list of issues on GitHub](https://github.com/zsh-users/zsh-autosuggestions/issues?q=) to see if someone else has already reported it.
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### Reporting an Issue
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Before reporting an issue, please try temporarily disabling sections of your configuration and other plugins that may be conflicting with this plugin to isolate the problem.
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When reporting an issue, please include:
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- The smallest, simplest `.zshrc` configuration that will reproduce the problem. See [this comment](https://github.com/zsh-users/zsh-autosuggestions/issues/102#issuecomment-180944764) for a good example of what this means.
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- The version of zsh you're using (`zsh --version`)
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- Which operating system you're running
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## Uninstallation
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1. Remove the code referencing this plugin from `~/.zshrc`.
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2. Remove the git repository from your hard drive
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```sh
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rm -rf ~/.zsh/zsh-autosuggestions # Or wherever you installed
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```
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## Development
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### Build Process
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Edit the source files in `src/`. Run `make` to build `zsh-autosuggestions.zsh` from those source files.
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### Pull Requests
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Pull requests are welcome! If you send a pull request, please:
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- Request to merge into the `develop` branch (*NOT* `master`)
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- Match the existing coding conventions.
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- Include helpful comments to keep the barrier-to-entry low for people new to the project.
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- Write tests that cover your code as much as possible.
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### Testing
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Tests are written in ruby using the [`rspec`](http://rspec.info/) framework. They use [`tmux`](https://tmux.github.io/) to drive a pseudoterminal, sending simulated keystrokes and making assertions on the terminal content.
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Test files live in `spec/`. To run the tests, run `make test`. To run a specific test, run `TESTS=spec/some_spec.rb make test`. You can also specify a `zsh` binary to use by setting the `TEST_ZSH_BIN` environment variable (ex: `TEST_ZSH_BIN=/bin/zsh make test`).
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It's possible to run the tests for any supported version of zsh in a Docker image by building an image from the provided Dockerfile. To build the docker image for a specific version of zsh (where `<version>` below is substituted with the contents of a line from the [`ZSH_VERSIONS`](ZSH_VERSIONS) file), run:
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```sh
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docker build --build-arg TEST_ZSH_VERSION=<version> -t zsh-autosuggestions-test .
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```
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After building the image, run the tests via:
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```sh
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docker run -it -v $PWD:/zsh-autosuggestions zsh-autosuggestions-test make test
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```
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## License
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This project is licensed under [MIT license](http://opensource.org/licenses/MIT).
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For the full text of the license, see the [LICENSE](LICENSE) file.
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