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417 lines
9.1 KiB
Markdown
417 lines
9.1 KiB
Markdown
#  Snekdown - More than just Markdown 
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This projects goal is to implement a fast markdown parser with an extended syntax fitted
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for my needs.
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## Installation
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You need a working rust installation, for example by using [rustup](http://rustup.rs).
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```sh
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cargo install snekdown
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```
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With pdf rendering
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```sh
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cargo install snekdown --features pdf
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```
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## Usage
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```
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snekdown 0.30.5
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USAGE:
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snekdown <SUBCOMMAND>
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FLAGS:
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-h, --help Prints help information
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-V, --version Prints version information
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SUBCOMMANDS:
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clear-cache Clears the cache directory
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help Prints this message or the help of the given subcommand(s)
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render Parse and render the document
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watch Watch the document and its imports and render on change
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```
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### Rendering / Watching
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```
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Parse and render the document
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USAGE:
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snekdown render [FLAGS] [OPTIONS] <input> <output>
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FLAGS:
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-h, --help Prints help information
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--no-cache Don't use the cache
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-V, --version Prints version information
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OPTIONS:
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-f, --format <format> the output format [default: html]
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ARGS:
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<input> Path to the input file
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<output> Path for the output file
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```
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## Syntax
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### Images
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```md
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Simple Syntax
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!(url)
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Extended syntax with a description
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Extended syntax with metadata to specify the size
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[metadata]
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Extended syntax with metadata and no description
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!(url)[metadata]
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```
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When generating the html file the images are base64 embedded. To turn off this behaviour
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set the config parameter `embed-external` to `false`.
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### Quotes
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```md
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Simple (default) Syntax
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> This is a quote
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Multiline
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> This is a
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> Multiline Quote
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Quote with metadata (e.g. Author)
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[author=Trivernis year=2020 display='{{author}} - {{year}}']> This is a quote with metadata
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```
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### Imports
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Imports can be used to import a different document to be attached to the main document.
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Imports are parsed via multithreading.
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```md
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<[path]
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<[document.md]
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<[style.css][type=stylesheet]
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```
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The parser differentiates four different types of imported files.
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- `document` - The default import which is just another snekdown document
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- `stylesheet` - CSS Stylesheets that are inclued when rendering
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- `bibliography` - A file including bibliography
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- `config`/`manifest` - A config file that contains metadata
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If no type is provided the parser guesses the type of file from the extension.
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### Tables
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Tables MUST start with a pipe character `|`
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```md
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Standalone header:
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| header | header | header
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Header with rows
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| header | header | header
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|--------|--------|-------
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| row | row | row
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```
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### Placeholders
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Placeholders can be used to insert special elements in a specific place.
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Placeholders are always case insensitive.
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```md
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Insert the table of contents
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[[TOC]]
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Insert the current date
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[[date]]
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Insert the current time
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[[time]]
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```
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### Metadata
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Additional metadata can be provided for some elements.
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```md
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String value
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[key = value]
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String value
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[key = "String value"]
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Integer value
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[key = 123]
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Float value
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[key = 1.23]
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Boolean
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[key]
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Boolean
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[key = false]
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Placeholder
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[key = [[placeholder]]]
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```
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Metadata can also be defined in a separate toml file with simple key-value pairs.
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Example:
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```toml
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# bibliography.bib.toml
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author = "Snek"
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published = "2020"
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test-key = ["test value", "test value 2"]
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# those files won't get imported
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ignored-imports = ["style.css"]
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# stylesheets that should be included
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included-stylesheets = ["style2.css"]
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# other metadata files that should be included
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included-configs = []
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# bibliography that should be included
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included-bibliography = ["mybib.toml"]
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# glossary that sould be included
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included-glossary = ["myglossary.toml"]
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# if external sources (images, stylesheets, MathJax)
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# should be embedded into the document (default: true)
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embed-external = true
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# If SmartArrows should be used (default: true)
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smart-arrows = true
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# Includes a MathJax script tag in the document to render MathML in chromium.
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# (default: true)
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include-math-jax = true
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### Image processing options ###
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# Force convert images to the specified format.
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# Supported formats are png, jpeg, gif, bmp, (ico needs size <= 256), avif, pnm
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# (default: keep original)
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image-format = "jpg"
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# the max width for the images.
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# if an image is larger than that it get's resized.
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# (default: none)
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image-max-width = 700
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# the max width for the images.
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# if an image is larger than that it get's resized.
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# (default: none)
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image-max-height = 800
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### PDF Options - needs the pdf feature enabled ###
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# If the header and footer of the pdf should be displayed (default: true)
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pdf-display-header-footer = true
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# PDF header template of each page (default: empty)
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pdf-header-template = "<div><span class='title'></span></div>"
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# PDF footer template of each page (default: see chromium_pdf assets)
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pdf-footer-template = "<div><span class='pageNumber'></span></div>"
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# Top margin of the pdf. Should be between 0 and 1. (default: 1.0)
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pdf-margin-top = 1
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# Bottom margin of the pdf. Should be between 0 and 1. (default: 1.0)
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pdf-margin-bottom = 1
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# Left margin of the pdf. Should be between 0 and 1.
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pdf-margin-left = 0
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# Right margin of the pdf. Should be between 0 and 1.
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pdf-margin-right = 0
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# Page height of the pdf
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pdf-page-height = 100
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# Page width of the pdf
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pdf-page-width = 80
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# The scale at which the website is rendered into pdf.
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pdf-page-scale = 1.0
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```
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The `[Section]` keys are not relevant as the structure gets flattened before the values are read.
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#### Usage
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```
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Hide a section (including subsections) in the TOC
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#[toc-hidden] Section
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Set the size of an image
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!(url)[width = 42%, height=auto, brightness=10, contrast=1.2, huerotate=180, invert, grayscale]
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Set the source of a quote
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[author=Me date=[[date]] display="{{author}} - {{date}}"]> It's me
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Set options for placeholders
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[[toc]][ordered]
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```
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### Centered Text
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```
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|| These two lines
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|| are centered
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```
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### Inline
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```md
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*Italic*
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**Bold**
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~~Striked~~
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_Underlined_
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^Superscript^
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`Monospace`
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:Emoji:
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§[#0C0]Colored text§[] §[red] red §[]
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```
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## Bibliography
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Bibliography entries can be defined and referenced anywhere in the document.
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Definition:
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```md
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[SD_BOOK]:[type=book, author=Snek, title = "Snekdown Book" date="20.08.2020", publisher=Snek]
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[SD_GITHUB]: https://github.com/trivernis/snekdown
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```
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Usage:
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```
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There is a book about snekdown[^book] and a github repo[^github].
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```
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Entries can also be defined in a separate toml file with the following data layout:
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```toml
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# snekdown.toml
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[BIB_KEY]
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key = "value"
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[SD_BOOK]
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type = "book"
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author = "Snek"
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title = "Snekdown Book"
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date = "20.08.2020"
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publisher = "Snek"
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[SD_GITHUB]
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type = "website"
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url = "https://github.com/trivernis/snekdown"
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```
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The valid types for entries and required fields can be found on in the [bibliographix README](https://github.com/Trivernis/bibliographix#bibliography-types-and-fields).
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Bibliography entries are not rendered. To render a list of used bibliography insert the
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`bib` placeholder at the place you want it to be rendered.
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## Glossary
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Glossary entries are to be defined in a `glossary.toml` file or any other toml file
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that is imported as type `glossary`.
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The definition of glossary entries has to follow the following structure
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```toml
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[SHORT]
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long = "Long Form"
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description = "The description of the entry"
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# Example
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[HTML]
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long = "Hypertext Markup Language"
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description = "The markup language of the web"
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```
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Those glossary entries can be referenced in the snekdown file as follows:
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```md
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~HTML is widely used for websites.
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The format ~HTML is not considered a programming language by some definitions.
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~~HTML
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```
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The first occurence of the glossary entry (`~HTML`) always uses the long form.
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The second will always be the short form. The long form can be enforced by using two
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(`~~HTML`) tildes.
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## Math
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Snekdown allows the embedding of [AsciiMath](http://asciimath.org/):
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The AsciiMath parser is provided in the [asciimath-rs](https://github.com/Trivernis/asciimath-rs) crate
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```
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inline math $$ a^2 + b^2 = c^2 $$
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Block Math
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$$$
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A = [[1, 2],[3,4]]
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$$$
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```
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The expression get's converted into MathML which is then converted by MathJax when loaded in
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the browser.
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## Smart Arrows
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Snekdown automatically renders the sequences `-->`, `==>`, `<--`, `<==`, `<-->`, `<==>` as
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their respective unicode arrows (similar to [markdown-it-smartarrows](https://github.com/adam-p/markdown-it-smartarrows)).
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This behavior can be turned off by setting the config parameter `smart-arrows` to `false`
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(the config needs to be imported before the arrows are used for that to work).
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## Roadmap
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The end goal is to have a markup language with features similar to LaTeX.
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- [x] Checkboxes
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- [x] Emojis (\:emoji:)
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- [x] Colors
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- [x] Watching and rendering on change
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- [x] Metadata files
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- [x] Bibliography
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- [x] Math
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- [x] Glossary
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- [x] Chromium based pdf rendering
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- [x] Custom Stylesheets
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- [x] Smart arrows
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- [ ] Custom Elements via templates (50%)
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- [ ] Cross References
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- [ ] Figures
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- [ ] EPUB Rendering
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- [ ] Text sizes
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- [ ] Title pages |