gmi-web/README.md

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The converted Gemini document should exist inside the `<body>`. Consider if sharing the page with other HTML to put the core document inside `<main>`. [Each Gemini line-type](https://gemini.circumlunar.space/docs/specification.html#5-3-line-orientation) may be translated using the following guide:
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````
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<p>
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<a> ↔ =>
<pre> ↔ ```
<h[1-3]> ↔ #[##]
<li> ↔ *
<blockquote> ↔ >
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````
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`<li>` must be wrapped in `<ul>`. Take care to render `<pre>` blocks with their original formatting, _do not_ indent the generated HTML for these tags.
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`<a>` tags are categorized as inline which CSS [Normal Flow](https://developer.mozilla.org/en-US/docs/Learn/CSS/CSS_layout/Normal_Flow) presents vertically—Gemini only deals with horizontally flowing content, this can be addressed by using [`display: block;` at the CSS level.](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flow_Layout/Block_and_Inline_Layout_in_Normal_Flow#changing_the_formatting_context_an_element_participates_in)
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## optional: inline media
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If a URL is consumable by `<img>`, `<audio>` or `<video>` you may insert the respective tag inline, instead of an `<a>`. It's a good idea to also include the `controls` property.
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These are categorized as inline just like `<a>` and will need `display: block;` styling. Images and video should also have `max-width: 100%;` so they don't overflow the body.
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## `<html>` and `<head>`
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When producing a complete and valid HTML5 document the first declaration is the required `<!DOCTYPE html>`. At the root of a document is the `<html>` tag which should have a [`lang` attribute declaring the overall language of the page](https://www.w3.org/International/questions/qa-html-language-declarations) as well as `dir="rtl"` if necessary.
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A `<head>` tag with at least the following must be included:
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```html
<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width,initial-scale=1" />
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<title></title>
```
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These may also be nice to have:
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```html
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<meta name="author" content="" />
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<meta name="description" content="" />
<link rel="canonical" href="gemini://" />
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<meta name="color-scheme" content="dark light" />
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```
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# gmi.css
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`gmi.css` is a maximally miniminal stylesheet that overrides the default CSS [Normal Flow](https://developer.mozilla.org/en-US/docs/Learn/CSS/CSS_layout/Normal_Flow) to render content horizontally in a Gemini way. `gmi-web.css` extends upon that slightly with font and color options. The default values are optimized for readability and mobile-friendliness and may be customized by adding a style property to `<html>`.
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```html
<head>
<!-- assuming you wanna host a copy and link to it... -->
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<link rel="stylesheet" type="text/css" href="gmi-web.css" />
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<meta name="color-scheme" content="dark light" />
<!-- ... -->
</head>
<html style="--foreground:#555555; --background:#9EEBCF;">
<!-- ... -->
</html>
```
The `--foreground` and `--background` variables will be inverted when
[prefers-color-scheme](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme) is "dark".
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# gmi-web(1)
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A command-line utility that pulls all of the above together into a unix-like API for creating HTML from Gemini documents.
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```sh
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npm install --global gmi-web-cli && gmi-web --help
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```
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## config
A JSON file can be passed to `--config` for conveniently applying any option without using the command-line flag. For example a `web.json` file with the following contents...
```json
{
"html": "en",
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"description": true,
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"foreground": "#137752",
"background": "#F4F4F4"
}
```
...can be used like so:
```sh
gmi-web --config web.json $(find ~/gmi/dst -name '*.gmi')
```
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## css
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gmi-web ships with `gmi.css` and `gmi-web.css` but it is possible to use your own set of completely custom CSS rules _and_ variables by pointing to a file containing them!
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```sh
gmi-web --body --css custom.css < doc.gmi
```
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gmi-web auto-detects the need for the `<meta>` color-schemes and allows for using `--inline` to insert the declarations as `style` properties on their respective blocks. Variables defined in `:root` will be picked up and made available for configuration just like `gmi-web.css`.
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```
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gmi-web [files..]
Convert text/gemini to text/html.
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Core:
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--body [boolean]
--html, --language, --lang [string]
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--css
HTML:
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--author [string]
--description
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Media:
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--image [array]
--audio [array]
--video [array]
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gmi-web.css:
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--foreground [default: "black"]
--background [default: "white"]
--body-width [default: "48rem"]
--hyphens [default: "manual"]
--serif [default: "georgia, times, serif"]
--sans-serif [default: "avenir, helvetica, arial, sans-serif"]
--mono [default: "consolas, monaco, monospace"]
--p-family [default: "var(--serif)"]
--p-size [default: "1.25rem"]
--p-height [default: "1.5"]
--p-indent [default: "0rem"]
--a-family [default: "var(--serif)"]
--a-size [default: "var(--p-size)"]
--a-height [default: "1.5"]
--a-decoration [default: "underline"]
--a-style [default: "normal"]
--pre-family [default: "var(--mono)"]
--pre-size [default: "1rem"]
--pre-height [default: "1"]
--h1-family [default: "var(--sans-serif)"]
--h1-size [default: "3rem"]
--h1-height [default: "1.25"]
--h2-family [default: "var(--sans-serif)"]
--h2-size [default: "2.25rem"]
--h2-height [default: "1.25"]
--h3-family [default: "var(--sans-serif)"]
--h3-size [default: "1.5rem"]
--h3-height [default: "1.25"]
--ul-family [default: "var(--serif)"]
--ul-size [default: "var(--p-size)"]
--ul-height [default: "1.25"]
--ul-style [default: "circle"]
--quote-family [default: "var(--serif)"]
--quote-size [default: "var(--p-size)"]
--quote-height [default: "1.25"]
--quote-style [default: "italic"]
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Options:
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--version Show version number [boolean]
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--config Path to JSON config file
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--help Show help [boolean]
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Examples:
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gmi-web --body < doc.gmi
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gmi-web --html en $(find ~/my-capsule -name '*.gmi')
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gmi-web --foreground '#9EEBCF' --html en < doc.gmi
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gmi-web --image jpg --audio mp3 --image png --body < doc.gmi
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See the gmi-web(1) man page for more information.
```
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# license
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gmi-web is free and unencumbered public domain software. For more information, see http://unlicense.org/ or the accompanying UNLICENSE file.