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|
package main
import (
"html/template"
"log"
"net/http"
)
// pageCSS is the stylesheet shared by the editor and the preview.
//
// The preview half deliberately mirrors the typography of profpatsch.de
// (Quattrocento body serif, Open Sans headings, a ~60ch measure, the same
// light/dark palette) so that what you see while writing is what the published
// page will look like. The editor half is a plain card list with no
// resemblance to the site, because it is a tool, not a page.
const pageCSS = `
:root {
--bg: #ffffff;
--fg: #111111;
--muted: #777777;
--link: #0b5fff;
--border: #dddddd;
--card: #f7f7f8;
--accent: #2f6fb0;
--danger: #c62828;
}
@media (prefers-color-scheme: dark) {
:root {
--bg: #1a1a1a;
--fg: #dddddd;
--muted: #888888;
--link: #aaddff;
--border: #3a3a3a;
--card: #242427;
--accent: #5aa3dd;
--danger: #e57373;
}
}
*, *::before, *::after { box-sizing: border-box; }
body {
margin: 0;
background: var(--bg);
color: var(--fg);
font-family: system-ui, sans-serif;
line-height: 1.5;
}
a { color: var(--link); }
/* ── shell ───────────────────────────────────────────────────────────── */
header.top {
position: sticky; top: 0; z-index: 20;
background: var(--bg);
border-bottom: 1px solid var(--border);
padding: .6rem 1rem;
display: flex; align-items: center; gap: .75rem;
}
header.top h1 { font-size: 1.05rem; margin: 0; flex: 1; font-weight: 600; }
header.top a { text-decoration: none; }
.wrap { max-width: 62ch; margin: 0 auto; padding: 1.5rem 1rem 6rem; }
button, .btn {
font: inherit; font-size: .85rem;
padding: .3rem .7rem;
border: 1px solid var(--border); border-radius: 5px;
background: var(--card); color: var(--fg);
cursor: pointer;
}
button:hover, .btn:hover { border-color: var(--accent); }
button.danger { color: var(--danger); }
.muted { color: var(--muted); font-size: .85rem; }
/* ── post list ───────────────────────────────────────────────────────── */
ul.posts { list-style: none; padding: 0; }
ul.posts li {
border-bottom: 1px solid var(--border);
padding: .6rem 0;
display: flex; align-items: baseline; gap: .6rem;
}
ul.posts li a { font-weight: 600; text-decoration: none; flex: 1; }
form.newpost { display: flex; gap: .5rem; margin: 1rem 0 2rem; }
form.newpost input {
flex: 1; font: inherit; padding: .4rem .6rem;
border: 1px solid var(--border); border-radius: 5px;
background: var(--bg); color: var(--fg);
}
/* ── editor ──────────────────────────────────────────────────────────── */
.post-meta { display: flex; flex-direction: column; gap: .5rem; margin-bottom: 1.5rem; }
.post-meta input {
font: inherit; padding: .4rem .6rem;
border: 1px solid var(--border); border-radius: 5px;
background: var(--bg); color: var(--fg);
}
.post-meta input.title { font-size: 1.3rem; font-weight: 600; }
.block {
border: 1px solid var(--border); border-radius: 7px;
background: var(--card);
margin: .5rem 0;
padding: .5rem;
}
/* The block being dragged, and the gap that opens where it would land. */
.block.dragging { opacity: .4; }
.block.drop-target { border-color: var(--accent); border-style: dashed; }
.block-head {
display: flex; align-items: center; gap: .4rem;
font-size: .75rem; color: var(--muted);
margin-bottom: .4rem;
}
.block-head .kind { text-transform: uppercase; letter-spacing: .05em; flex: 1; }
.block-head .handle { cursor: grab; user-select: none; padding: 0 .3rem; }
.block textarea {
width: 100%; font: inherit;
font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
font-size: .85rem; line-height: 1.45;
border: 1px solid var(--border); border-radius: 5px;
background: var(--bg); color: var(--fg);
padding: .5rem; resize: vertical;
}
.block input.meta {
width: 100%; font: inherit; font-size: .8rem; margin-top: .3rem;
border: 1px solid var(--border); border-radius: 5px;
background: var(--bg); color: var(--fg); padding: .3rem .5rem;
}
.block img.thumb { max-width: 100%; border-radius: 5px; display: block; }
.block .saving { color: var(--accent); }
.add-bar { display: flex; gap: .4rem; margin: 1rem 0; flex-wrap: wrap; }
/* Full-window overlay shown while a file is dragged over the page. */
.dropzone {
position: fixed; inset: 0; z-index: 50;
background: rgba(47,111,176,.15);
border: 3px dashed var(--accent);
display: none; align-items: center; justify-content: center;
font-size: 1.3rem; color: var(--accent); font-weight: 600;
pointer-events: none;
}
body.dragging-file .dropzone { display: flex; }
.errors { color: var(--danger); font-size: .85rem; }
/* ── preview: matches profpatsch.de ──────────────────────────────────── */
article.post {
max-width: 62ch; margin: 0 auto; padding: 2rem 1rem 5rem;
font-size: 20px;
}
article.post h1 { font-weight: 300; font-size: 2.2rem; margin-bottom: .1em; }
article.post .subtitle { font-weight: 300; font-size: 1.2rem; color: var(--muted); margin-top: 0; }
article.post h2, article.post h3 { font-weight: 400; margin-top: 2em; }
article.post p, article.post li {
font-family: Quattrocento, Georgia, serif;
line-height: 1.5em;
}
article.post p { text-align: justify; }
article.post pre {
overflow-x: auto; padding: .8rem; border-radius: 6px;
font-size: .8rem; line-height: 1.45;
background: var(--card);
}
article.post code { font-size: .85em; }
article.post pre code { font-size: inherit; }
article.post blockquote {
margin: 1.5em 0; padding-left: 1em;
border-left: 3px solid var(--border); color: var(--muted);
}
article.post table { border-collapse: collapse; width: 100%; font-size: .9rem; }
article.post th, article.post td { border: 1px solid var(--border); padding: .3rem .5rem; }
figure.block-image, figure.block-stl { margin: 2em 0; }
figure.block-image img { max-width: 100%; height: auto; display: block; border-radius: 4px; }
figcaption {
font-size: .8rem; color: var(--muted); margin-top: .5em; text-align: center;
font-family: system-ui, sans-serif;
}
.block-error {
border: 1px solid var(--danger); color: var(--danger);
border-radius: 5px; padding: .5rem; font-size: .85rem; margin: 1em 0;
}
/* ── stl viewer ──────────────────────────────────────────────────────── */
/* The viewer is inert until activated. Crucially it does NOT set
touch-action here: while inactive a finger must be able to scroll the page
past the model, exactly as it would past an image. Only .is-active takes
the gestures over. */
.stl-viewer {
position: relative;
width: 100%; aspect-ratio: 4 / 3;
background: var(--card);
border: 1px solid var(--border); border-radius: 6px;
display: flex; align-items: center; justify-content: center;
overflow: hidden;
/* Dragging the model must never begin a text selection or a native drag of
the canvas bitmap; either would be delivered as a drag-and-drop instead of
an orbit. The JS also calls preventDefault, but this holds even before a
listener runs. */
user-select: none; -webkit-user-select: none;
-webkit-user-drag: none;
}
.stl-viewer.is-active { touch-action: none; }
.stl-viewer canvas {
display: block; width: 100%; height: 100%;
cursor: default;
-webkit-user-drag: none;
}
.stl-viewer.is-active canvas { cursor: grab; }
.stl-viewer.is-active canvas:active { cursor: grabbing; }
.stl-viewer canvas:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.stl-viewer .stl-noscript { font-size: .9rem; color: var(--muted); padding: 1rem; text-align: center; }
/* The activation affordance, centred over a slightly dimmed model. */
.stl-activate {
position: absolute; z-index: 2;
font-size: .85rem; padding: .45rem .9rem;
border-radius: 999px;
background: var(--bg); color: var(--fg);
border: 1px solid var(--border);
box-shadow: 0 1px 4px rgba(0,0,0,.15);
cursor: pointer;
}
.stl-viewer.is-active .stl-activate { display: none; }
/* Dim only while inert, so it is visible that the model is not yet live. */
.stl-viewer:not(.is-active)::after {
content: ""; position: absolute; inset: 0; z-index: 1;
background: rgba(127,127,127,.12);
pointer-events: none;
}
/* Shown only while active: the way out must be visible, not guessed. */
.stl-hint {
display: none;
position: absolute; z-index: 2;
left: .5rem; bottom: .5rem;
font-size: .7rem; color: var(--muted);
background: var(--bg);
border: 1px solid var(--border); border-radius: 4px;
padding: .15rem .4rem;
pointer-events: none;
}
.stl-viewer.is-active .stl-hint { display: block; }
.stl-download { font-size: .8rem; margin: .4rem 0 0; text-align: center; }
`
// templates are parsed once at startup. A parse failure is a programming error
// in an embedded constant, so it panics rather than being handled.
var templates = template.Must(template.New("").Parse(indexTmpl + editTmpl + previewTmpl))
// render writes a named template, reporting a failure as a 500.
//
// Note that a template error after the first byte has been written cannot
// produce a clean error page; the log line is what makes such a truncated
// response diagnosable.
func (s *server) render(w http.ResponseWriter, name string, data map[string]any) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
if err := templates.ExecuteTemplate(w, name, data); err != nil {
log.Printf("render %s: %v", name, err)
}
}
const indexTmpl = `
{{define "index"}}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>blocks</title>
<link rel="stylesheet" href="/style.css">
</head>
<body>
<header class="top"><h1>blocks</h1></header>
<div class="wrap">
<form class="newpost" method="post" action="/posts">
<input name="title" placeholder="New post title" aria-label="New post title" required>
<button type="submit">Create</button>
</form>
{{if .Posts}}
<ul class="posts">
{{range .Posts}}
<li>
<a href="/edit/{{.Slug}}">{{if .Title}}{{.Title}}{{else}}(untitled){{end}}</a>
<span class="muted">{{.Status}}</span>
<a class="muted" href="/posts/{{.Slug}}">preview</a>
</li>
{{end}}
</ul>
{{else}}
<p class="muted">No posts yet.</p>
{{end}}
</div>
</body>
</html>{{end}}
`
const editTmpl = `
{{define "edit"}}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>{{.Post.Title}} — blocks</title>
<link rel="stylesheet" href="/style.css">
</head>
<body data-post-id="{{.Post.ID}}">
<header class="top">
<h1><a href="/">blocks</a></h1>
<span class="muted" id="status"></span>
<a class="btn" href="/posts/{{.Post.Slug}}" target="_blank" rel="noopener">Preview</a>
</header>
<div class="dropzone">Drop to add a block</div>
<div class="wrap">
<div class="post-meta">
<input class="title" id="post-title" value="{{.Post.Title}}" aria-label="Title" placeholder="Title">
<input id="post-subtitle" value="{{.Post.Subtitle}}" aria-label="Subtitle" placeholder="Subtitle">
</div>
<div id="blocks"></div>
<div class="add-bar">
<button data-add="markdown">+ Markdown</button>
<button data-add="code">+ Code</button>
<span class="muted">or drop an image / STL file anywhere</span>
</div>
<div class="errors" id="errors"></div>
</div>
<script type="application/json" id="initial-blocks">{{.BlocksJSON}}</script>
<script src="/static/editor.js"></script>
</body>
</html>{{end}}
`
const previewTmpl = `
{{define "preview"}}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>{{.Post.Title}}</title>
<link rel="stylesheet" href="/style.css">
</head>
<body>
<article class="post">
<h1>{{.Post.Title}}</h1>
{{if .Post.Subtitle}}<p class="subtitle">{{.Post.Subtitle}}</p>{{end}}
{{.Body}}
</article>
{{if .UsesSTL}}<script src="/static/stl-viewer.js"></script>{{end}}
</body>
</html>{{end}}
`
|