# MD-TUI
- [MD-TUI](#md-tui)
- [Installation](#installation)
- [Requirements](#requirements)
- [Usage](#usage)
- [Key binds](#key-binds)
- [Syntax highlighting](#syntax-highlighting)
- [Configuration](#configuration)
- [Keyboard actions](#keyboard-actions)
- [Colors and misc](#colors-and-misc)
- [Links](#links)
- [Neovim plugin](#neovim-plugin)
- [Contributions](#contributions)
- [Use as library](#use-as-library)
`MD-TUI` is a TUI application for viewing markdown files directly in your
terminal. I created it because I wasn't happy with how alternatives handled
links in their applications. While the full markdown specification is not yet
supported, it will slowly get there. It's a good solution for quickly viewing
your markdown notes, or opening external links from someones README. If your
terminal support images, they will render.
## Installation
Using cargo: `cargo install md-tui --locked`
On Arch Linux: `pacman -S md-tui`
For Nix users, there's also Nix flake.
On conda-forge: `pixi global install md-tui` or `pixi exec -s md-tui -- mdt my-file.md`
Prebuilt binaries with install script can be found on the release page.
### Requirements
1. A terminal
2. Nerd font
## Usage
Start the program running `mdt <file.md>` or just `mdt`. The latter will search
recursively from where it was invoked for any markdown file and show it in a
_file tree_.
You can also pipe the content into the program. Example: `cat README.md | mdt`.
## Key binds
These are the default settings. See [keyboard configuration](#keyboard-actions)
for configuration options.
| `j` or `<Down>` | Scroll down |
| `k` or `<Up>` | Scroll up |
| `h` | Go down half a page |
| `l` | Go up half a page |
| `d` or `<Left>` | Scroll one page down |
| `u` or `<Right>` | Scroll one page up |
| `f` or `/` | Search |
| `n` or `N` | Jump to next or previous search result |
| `s` or `S` | Enter select link mode. Different selection strategy. |
| `K` | Hover. Preview where a link is going without going there |
| `<Enter>` | Select. Depending on which mode it can: open file, select link, search |
| `Esc` | Go back to _normal_ mode |
| `t` | Go back to files |
| `b` | Go back to previous file (file tree if no previous file) |
| `g` | Go to top of file |
| `G` | Go to bottom of the file |
| `e` | Edit file in `$EDITOR` |
| `o` | Sort files in file tree |
| `q` | Quit the application |
## Syntax highlighting
`MD-TUI` supports syntax highlighting in code blocks for the following
languages:
- Bash/sh
- C/C++
- Css
- Elixir
- Go
- Html
- Java
- JavaScript
- Json
- Lua
- Luau
- Ocaml
- PHP
- Python
- Rust
- Scala
- Typescript
- Yaml
## Configuration
The program checks for the file `~/.config/mdt/config.toml` at startup. The
following parameters and their defaults are written below.
### Keyboard actions
Some key actions are not configurable. Like the following:
- Enter
- Arrow keys
- Escape
- Question mark for help menu
- 'q' to quit the application
- '/' for search
> If you override another default key, it's undefined behavior if that key does
> not get reassigned.
> Actions can only be assigned to single characters. Space, fn keys, ctrl+key,
> backspace etc., will not take effect and the default will be in use.
```toml
# Keyboard actions
up = 'k'
down = 'j'
page_up = 'u'
page_down = 'd'
half_page_down = 'l'
half_page_up = 'h'
top = 'g'
bottom = 'G'
search = 'f'
search_next = 'n'
search_previous = 'N'
# This will search downwards until it finds one or select the last link in document.
select_link = 's'
# Finds the link 2/3 up the page. It will search then for closest in both direction.
select_link_alt = 'S'
edit = 'e'
hover = 'K'
back = 'b'
file_tree = 't'
sort = 'o'
```
### Colors and misc
Setting color to `""` will not remove it, but leave it as its default. To remove
colors, set it to `reset`.
```toml
# General settings
width = 100 # Set to 0 for full terminal width
gitignore = false
# Inline styling
bold_color = "reset"
bold_italic_color = "reset"
code_bg_color = "#2A2A2A"
code_fg_color = "red"
italic_color = "reset"
link_color = "blue"
link_selected_bg_color = "darkgrey"
link_selected_fg_color = "green"
strikethrough_color = "reset"
# Block styling
code_block_bg_color = "#2A2A2A"
quote_bg_color = "reset"
table_header_bg_color = "reset"
table_header_fg_color = "yellow"
# File tree
file_tree_name_color = "blue"
file_tree_page_count_color = "lightgreen"
file_tree_path_color = "gray"
file_tree_selected_fg_color = "lightgreen"
# Quote bar
quote_caution = "lightmagenta"
quote_default = "white"
quote_important = "lightred"
quote_note = "lightblue"
quote_tip = "lightgreen"
quote_warning = "lightYellow"
# Heading
h_bg_color = "blue"
h_fg_color = "black"
h2_fg_color = "green"
h3_fg_color = "magenta"
h4_fg_color = "cyan"
h5_fg_color = "yellow"
h6_fg_color = "lightred"
```
## Links
MD-TUI currently supports `[text](url)`, `[[link]]`, and `[[link|Some title]]`
type of links.
## Neovim plugin
This application also exists as a plugin for Neovim called
[Preview](https://github.com/henriklovhaug/Preview.nvim).
> [!NOTE]
>
> This version does not support images regardless of your terminal capabilities.
## Contributions
Both PRs and issues are appreciated!
## Use as library
It's possible to use this as a library. It's not well documented for that use,
but the feature is there. There is one default feature attached, which is the
whole highlighting of code blocks.