Foremark is a tool for writing stylized plain text documents that can be managed and shared easily. Foremark extends upon the concept of Markdeep.
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"><pre><![CDATA[
**Title**
Welcome to Foremark, a technology for writing a shareable, _stylized_
text document.
:::::::::::::::::::::::::::::::::::::::::::::
:: .----------. ::
:: Write --> | Document | --> Web Browser ::
:: '----------' ::
:::::::::::::::::::::::::::::::::::::::::::::
]]></pre> <!-- Foremark footer -->
<script src="https://unpkg.com/foremark/browser/foremark.js" async="async"/></html>Save the above text as hello.fm.xhtml and open it with a web browser.
- Rich syntax based on Markdown.
- LaTeX Equations, rendered via KaTeX.
- ASCII diagrams, converted to SVG via Svgbob.
- Sidenotes and other stylings inspired by Edward Tufte's handouts.
- Syntax highlighting via highlight.js.
- Responsive — Documents can be displayed on a desktop screen, tablet and smartphone and printed on paper.
- Media handlers allow embedding various media contents including images, video files, audio files, and oEmbed URLs.
- Lazy loading — Foremark's code is broken into multiple modules and they are loaded as needed. This is implemented using Webpack's code splitting feature.
- Self-contained (offline) bundle —
foremark.bundle.jsis the special build of Foremark Viewer that includes every required asset in a single.jsfile and does not require an internet connection.
- Improved internal design — The rendering process is broken into multiple meaningful passes.
- Better browsing experience.
- Built based on modern web technologies. The source code is written in TypeScript and organized into modules.
- Supports flexible input formats ranging from Markdeep-like annotated plain text to explicit markups to meet various needs. In other words, you can write as explicitly as you want to!
- Svgbob calculates character widths correctly based on East Asian Width. This means wide characters such as
漢字and🚀can be used inside an ASCII diagram with no problem. - Foremark documents use the
.xhtmlfile extension.- Most source browsing softwares display XHTML files in the raw code. This is more preferrable to the situation with HTML, which is likely to be unintentionally "parsed" and mangled by less-functional viewers such as GitHub and GitLab.
- XHTML defaults to UTF-8 when the encoding is not specified. Thus
<meta charset="utf-8">is not needed in XHTML. - On a text browser (e.g., Lynx), Foremark gracefully falls back to plain-text rendering.
- The true offline experience — the self-contained bundle really includes every dependent library like KaTeX.
An input document tree is loaded from the currently open document. The script tag is inspected to determine the base path for lazy-loaded assets.
Annotations in the text contents of mf-text elements are parsed and converted into explicit markups. Non-textual parts are simply passed through, so you can write any part of a text using markups if you want to for some reasons.
The output of this step is a mixture of XHTML and custom elements, which we call Foremark XML. At this point, most constructs are represented using semantic markups, thus the document is ready to be styled using CSS. On the other hand, a few complex constructs are preserved in their original plain text form. Thus, the raw code of the format is still human-read/writable. The next step will further process complex constructs for optimal browser viewing.
This step processes custom elements of Foremark XML. The result looks pretty when viewed via a web browser, but the raw code might not no longer retain human-readability.
This step involves:
- LaTeX equation processing
- Diagrams to SVG conversion
- Footnote/sidenote layouting
The final HTML is displayed by a web-based viewer application embedded in foremark.js, which provides stylesheets as well as rich functionalities such as a table of contents.
app/— The source code of this program.converter/— Foremark processor.index.ts— The entry point of the library.view/— The viewer application.browser.tsx— The entry point for a web browser.foremark.ts— Common definitions of the Foremark format.utils/— Utilities.
lib/— Helper code for using external libraries.rust/— Rust crates.diagram/— An interface to Svgbob from the main application.svgbob/— Git subtree of https://github.com/ivanceras/svgbob.git.
examples/— Example Foremark files.*.mf.xhtml
test/— Mocha tests. They requiredist/to run.
Intermediate build artifacts:
wasm/— WebAssembly modules generated bywasm-bindgen.
NPM package:
browser/— Foremark processor + viewer to be loaded by Foremark files.foremark.js— The main file of the viewer.foremark-*.js,assets/— Asset files that are loaded on demand.foremark.bundle.js— Includes all of the above files in a single large package. (Self-contained bundle)*.wasmlicenses.txt— License information of all software packages included in this directory.
dist/— Provides a Foremark processor library.index.js— The entry point of the library.
Prerequisite:
- Node.js ≥ 10
npm install -g yarnrustuptoolchain add nightly-2019-01-20rustup target add wasm32-unknown-unknown --toolchain nightly-2019-01-20cargo installwasm-bindgen-cli--version 0.2.56cargo installwasm-snip- Binaryen (
brew install binaryenon Homebrew) including:wasm-opt cargo installcargo-license
$ yarn install
$ yarn build
# Alternatively, start the Webpack development server:
$ yarn build:wasm
$ yarn start --open- Foremark was originally named Markfront and changed later because the name was taken in many source code hosting services. "Front" was chosen as another adjective indicating a direction. It also refers to the front end of the layered transformation architecture.