Readline
This library is a modern, pure Go `readline` shell implementation, with full `.inputrc` and legacy
readline command/option support, and extended with various commands, options and tools commonly
found in modern shells. Its architecture and completion system is heavily inspired from Z-Shell.
It is used, between others, to power the [console](https://github.com/reeflective/console) library.
## Features
### Core
- Pure Go, almost-only standard library
- Cross-platform (Linux / MacOS / Windows)
- Full `.inputrc` support (all commands/options)
- Extensive test suite and almost full coverage of core code
- [Extended list](https://github.com/reeflective/readline/wiki/Keymaps-&-Commands) of additional commands/options (edition/completion/history)
- Complete [multiline edition/movement support](https://github.com/reeflective/readline/wiki/Multiline)
- Command-line edition in `$EDITOR`/`$VISUAL` support
- [Programmable API](https://github.com/reeflective/readline/wiki/Programmable-Commands), with failure-safe access to core components
- Support for an [arbitrary number of history sources](https://github.com/reeflective/readline/wiki/History-Sources)
### Emacs / Standard
- Native Emacs commands
- Emacs-style [macro engine](https://github.com/reeflective/readline/wiki/Macros#emacs) (not working across multiple calls)
- Keywords [switching](https://github.com/reeflective/readline/wiki/Keymaps-&-Commands#modifying-text) (operators, booleans, hex/binary/digit) with iterations
- Command/mode cursor status indicator
- Complete undo/redo history
- Command status/arg/iterations hint display
### Vim
- Near-native Vim mode
- Vim [text objects](https://github.com/reeflective/readline/wiki/Keymaps-&-Commands#text-objects) (code blocks, words/blank/shellwords)
- Extended surround select/change/add functionality, with highlighting
- Vim Visual/Operator pending mode & cursor styles indications
- Vim Insert and Replace (once/many)
- All Vim registers, with completion support
- [Vim-style](https://github.com/reeflective/readline/wiki/Macros#vim) macro recording (`q`) and invocation (`@`)
### Interface
- Support for PS1/PS2/RPROMPT/transient/tooltip [prompts](https://github.com/reeflective/readline/wiki/Prompts) (compatible with [oh-my-posh](https://github.com/JanDeDobbeleer/oh-my-posh))
- Extended completion system, [keymap-based and configurable](https://github.com/reeflective/readline/wiki/Keymaps-&-Commands#completion), easy to populate & use
- Multiple completion display styles, with color support.
- Completion & History incremental search system & highlighting (fuzzy-search).
- Automatic & context-aware suffix removal for efficient flags/path/list completion.
- Optional asynchronous autocomplete
- Builtin & programmable [syntax highlighting](https://github.com/reeflective/readline/wiki/Syntax-Highlighting)
## Documentation
Readline is used by the [console library](https://github.com/reeflective/console) and its [example binary](https://github.com/reeflective/console/tree/main/example). To get a grasp of the
functionality provided by readline and its default configuration, install and start the binary.
The documentation is available on the [repository wiki](https://github.com/reeflective/readline/wiki), for both users and developers.
## Showcases
- Emacs edition
(This extract is quite a pity, because its author is not using Emacs and does not know many of its shortcuts)
- Vim edition
- Undo/redo line history
- Keyword switching & selection
Switching various keywords
Using regexp-based selection to grab parts of words (here, URL components)
- Vim selection & movements (basic)
- Vim surround (selection and change)
Selecting/adding/changing surround regions
Surround and change in shellwords, matching brackets, etc.
- Vim registers (with completion)
- History movements/completion/use/search
History movement, completion and some other other widgets
- Completion
Classic mode & incremental search mode
Suffix-autoremoval
- Prompts
- Logging
- Inputrc init file reload
- Multiline edition
- Macros
Emacs
Vim
## Status
This library is now in a release status, as it has underwent several major rewrites and is now considered mostly
feature-complete, with a solid testing suite to ensure safe and smooth operation to the best extent possible.
New releases will be regularly pushed when bugs are found and corrected.
Additionally:
- Key dispatch/flushing, meta-key enable, etc might still contain some bugs/wrong behavior:
30 years of legacy support for 3000 different terminal emulators cannot be done right by me alone.
- Please open a PR or an issue if you face any bug, and it will be promptly resolved.
- Don't hesitate proposing a new feature or a PR if you deem it to be useful to most users.
## Credits
- @kenshaw for his `.inputrc` parsing package, which brings much wider compatibility to this library.
- `chzyer/readline` for the Windows I/O code and everything related.
- Some of the Vim code is inspired or translated from [zsh-vi-mode](https://github.com/jeffreytse/zsh-vi-mode).
- [lmorg/readline](https://github.com/lmorg/readline), for the line tokenizers.