gmi-web

Vision: Provide the lowest common denominator between HTML/CSS/JS and Gemini.

HTML spec

`<head>`

The generated HTML document must have a <head> tag with at minimum the following:

<head>
<meta charset="utf-8">
<meta language="en"> <!-- set this accordingly! -->
<meta name="viewport" content="width=device-width,initial-scale=1">
</head>

You might want to also include these (or whatever else):

<title></title>
<link rel="canonical" href="gemini://">
<meta name="description" content="">

`<body>`

The converted Gemini document should be placed inside the <body>. Due to the ambiguity of HTML several translations from Gemini exist in the wild. I propose the following standard:

<p>
<a>            ↔ =>
<pre>          ↔ ```
<h[1-3]>       ↔ #[##]
<li>           ↔ *
<blockquote>   ↔ >

The <a> for a link should be presented un-wrapped without any parent elements. Many implementations use <div> or <p> to enforce "block" styling as opposed to the default "inline" which renders the link next to the previous block instead of below it. But the nested markup adds an unnecessary layer of indirection in semantics. The best way to handle this is to include <style>a {display: block;}</style> in the <head>.

Empty lines should simply be represented as <p><br></p> this sets up contenteditable=true to add content to the line compared to just <br>.

Take care to render <pre> blocks with their original formatting, DO NOT indent the generated HTML for these tags.

Much like the lines of a <pre>, the lines of <li>list items</li> need to be wrapped in <ul>, indention here is not significant. Sometimes a list item is empty: <li><br></li>.

Optional: inline media

If a link is consumable by <img>, <audio> or <video> you may insert the respective tag inline instead of an <a>. Images and video should be styled to have max-width: 100%; so they don't overflow the body. It's a good idea to also include the "controls" attribute. <audio> tags require display: block; just like <a>.

Basic `<style>`

Without any CSS the browser renders all of this just a lil wonky. At bare minimum I recommend including the following in the <head> of all your generated .html files.

<style>p,a,pre,h1,h2,h3,ul,blockquote,img,audio,video{display:block;max-width:100%;margin:0;padding:0;overflow-wrap:anywhere;}</style>

gmi-web(1)

A reference implementation of what has been discussed above!

You will need:

node(1) w/ npm(1)

npm install --global git+https://codeberg.org/talon/gmi-web.git#v1.0.0
man gmi-web

Render .html for all the .gmi files in the current directory

gmi-web --lang "en" $(find . -name "*.gmi")

gmi.css

Optimized for readability, predictability, mobile-friendliness and ships with a handful of customizable variables. See man 5 gmi.css.

The --foreground and --background variables will be inverted when prefers-color-scheme is "dark" which is a system-level preference on devices.

Any of the variables can be customized by adding a style to the <html> element.

<html style="--foreground:#555555; --background:#9EEBCF;">

When using gmi-web(1) they can be customized by providing OPTIONS of the same name as the CSS variable.

gmi-web --lang en --foreground "#FFFFF" --background "#00000" *.gmi

License

gmi-web is free and unencumbered public domain software. For more information, see http://unlicense.org/ or the accompanying UNLICENSE file.

4.4 KiB Raw Blame History

gmi-web

HTML spec

<head>

<body>