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silverbullet/web/cm_plugins/wiki_link.ts

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import { pageLinkRegex } from "../../common/parser.ts";
import {
Decoration,
DecorationSet,
EditorView,
ViewPlugin,
ViewUpdate,
} from "../deps.ts";
import {
invisibleDecoration,
isCursorInRange,
iterateTreeInVisibleRanges,
} from "./util.ts";
/**
* Plugin to hide path prefix when the cursor is not inside.
*/
class CleanWikiLinkPlugin {
decorations: DecorationSet;
constructor(view: EditorView) {
this.decorations = this.compute(view);
}
update(update: ViewUpdate) {
if (update.docChanged || update.viewportChanged || update.selectionSet) {
this.decorations = this.compute(update.view);
}
}
compute(view: EditorView): DecorationSet {
const widgets: any[] = [];
// let parentRange: [number, number];
iterateTreeInVisibleRanges(view, {
enter: ({ type, from, to }) => {
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if (type.name === "WikiLink") {
// Adding 2 on each side due to [[ and ]] that are outside the WikiLinkPage node
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if (isCursorInRange(view.state, [from, to])) {
return;
}
// Add decoration to hide the prefix [[
widgets.push(
invisibleDecoration.range(
from,
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from + 2,
),
);
// Add decoration to hide the postfix [[
widgets.push(
invisibleDecoration.range(
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to - 2,
to,
),
);
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// Now check if this page has an alias
const text = view.state.sliceDoc(from, to);
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const match = pageLinkRegex.exec(text);
if (!match) return;
const [_fullMatch, page, pipePart] = match;
if (!pipePart) {
// No alias, let's check if there's a slash in the page name
if (text.indexOf("/") === -1) {
return;
}
// Add a inivisible decoration to hide the path prefix
widgets.push(
invisibleDecoration.range(
from + 2, // +2 to skip the [[
from + text.lastIndexOf("/") + 1,
),
);
} else {
// Alias is present, so we hide the part before the pipe
widgets.push(
invisibleDecoration.range(
from + 2,
from + page.length + 3, // 3 is for the [[ and the |
),
);
}
}
},
});
return Decoration.set(widgets, true);
}
}
export const cleanWikiLinkPlugin = () => [
ViewPlugin.fromClass(CleanWikiLinkPlugin, {
decorations: (v) => v.decorations,
}),
];