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silverbullet/web/cm_plugins/link.ts

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import { ClickEvent } from "../../plug-api/app_event.ts";
import {
Decoration,
DecorationSet,
EditorView,
ViewPlugin,
ViewUpdate,
} from "../deps.ts";
import { Editor } from "../editor.tsx";
import {
invisibleDecoration,
isCursorInRange,
iterateTreeInVisibleRanges,
} from "./util.ts";
import { LinkWidget } from "./util.ts";
export function linkPlugin(editor: Editor) {
return ViewPlugin.fromClass(
class {
decorations: DecorationSet = Decoration.none;
constructor(readonly view: EditorView) {
this.decorations = this.calculateDecorations();
}
calculateDecorations() {
const widgets: any[] = [];
const view = this.view;
iterateTreeInVisibleRanges(this.view, {
enter: ({ type, from, to }) => {
if (type.name !== "Link") {
return;
}
// Adding 2 on each side due to [[ and ]] that are outside the WikiLinkPage node
if (isCursorInRange(view.state, [from, to])) {
return;
}
// Hide the whole thing
widgets.push(
invisibleDecoration.range(
from,
to,
),
);
const text = view.state.sliceDoc(from, to);
// Links are of the form [hell](https://example.com)
const [anchorPart, linkPart] = text.split("]("); // Not pretty
const cleanAnchor = anchorPart.substring(1); // cut off the initial [
const cleanLink = linkPart.substring(0, linkPart.length - 1); // cut off the final )
widgets.push(
Decoration.widget({
widget: new LinkWidget(
cleanAnchor,
`Click to visit ${cleanLink}`,
"sb-link",
(e) => {
if (e.altKey) {
// Move cursor into the link, approximate location
return view.dispatch({
selection: { anchor: from + 1 },
});
}
// Dispatch click event to navigate there without moving the cursor
const clickEvent: ClickEvent = {
page: editor.currentPage!,
ctrlKey: e.ctrlKey,
metaKey: e.metaKey,
altKey: e.altKey,
pos: from,
};
editor.dispatchAppEvent("page:click", clickEvent).catch(
console.error,
);
},
),
}).range(from),
);
},
});
return Decoration.set(widgets, true);
}
update(update: ViewUpdate) {
if (
update.docChanged ||
update.viewportChanged ||
update.selectionSet
) {
this.decorations = this.calculateDecorations();
}
}
},
{ decorations: (v) => v.decorations },
);
}