Phase 1: gtd-calendar fence, webview round trip, drilldown proof

- New markdown-it content script intercepts ```gtd-calendar fences and
  emits a placeholder div (config URI-encoded in a data attribute)
- New webview asset (gtd-calendar-webview.js) finds placeholders, requests
  data via webviewApi.postMessage, renders a debug view, and wires
  click-to-open drilldown (openNote command)
- index.ts registers the content script and handles getEvents/openNote;
  getEvents parses the YAML config for real but returns hardcoded events,
  including one pointing at the current note to prove drilldown
- Old event-calendar content script removed; Calendar/ classes retained
  for reuse in Phase 3
- Fork CSS section appended (placeholder, error, debug styles)

package-lock.json

@@ -1,12 +1,12 @@
 {
-  "name": "joplin-plugin-event-calendar",
-  "version": "0.3.0",
+  "name": "joplin-plugin-gtd-calendar",
+  "version": "0.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "joplin-plugin-event-calendar",
-      "version": "0.3.0",
+      "name": "joplin-plugin-gtd-calendar",
+      "version": "0.1.0",
       "license": "MIT",
       "dependencies": {
         "date-fns": "^2.29.3",

plugin.config.json

@@ -1,3 +1,3 @@
 {
-	"extraScripts": ["joplin-plugin-event-calendar.ts"]
+	"extraScripts": ["gtd-calendar-renderer.ts"]
 }

src/event-calendar.css

@@ -127,3 +127,37 @@
   top: 5vh;
   right: 5vw;
 }
+
+/* --- GTD Calendar (fork) --- */
+
+.gtd-calendar-placeholder .gtd-calendar-loading {
+	font-style: italic;
+	opacity: 0.7;
+}
+
+.gtd-calendar-error {
+	border: 1px solid #c0392b;
+	border-radius: 4px;
+	padding: 0.5em 0.75em;
+	color: #c0392b;
+}
+
+.gtd-calendar-debug {
+	border: 1px dashed currentColor;
+	border-radius: 6px;
+	padding: 0.75em 1em;
+}
+
+.gtd-calendar-debug-meta {
+	font-size: 0.85em;
+	opacity: 0.75;
+}
+
+.gtd-calendar-debug-events li {
+	margin: 0.25em 0;
+}
+
+.gtd-calendar-clickable {
+	cursor: pointer;
+	text-decoration: underline;
+}

src/gtd-calendar-renderer.ts

@@ -0,0 +1,59 @@
+const FENCE_INFO = "gtd-calendar";
+
+/**
+ * Markdown-it content script.
+ *
+ * Markdown-it renders synchronously and has no access to the Joplin data
+ * API, so this script does the minimum possible: it intercepts
+ * ```gtd-calendar fences and emits a placeholder <div> carrying the raw
+ * (URI-encoded) fence content and our content script id.
+ *
+ * The companion webview asset (gtd-calendar-webview.js) finds these
+ * placeholders in the rendered note, requests event data from the main
+ * plugin process via webviewApi.postMessage, and builds the calendar DOM.
+ */
+export default function (context: { contentScriptId: string }) {
+	return {
+		plugin: function (markdownIt: any) {
+			const defaultRender: Function =
+				markdownIt.renderer.rules.fence ||
+				function (
+					tokens: any[],
+					idx: number,
+					options: any,
+					env: any,
+					self: any
+				) {
+					return self.renderToken(tokens, idx, options, env, self);
+				};
+
+			markdownIt.renderer.rules.fence = function (
+				tokens: any[],
+				idx: number,
+				options: {},
+				env: any,
+				self: any
+			) {
+				const token = tokens[idx];
+				if (token.info !== FENCE_INFO)
+					return defaultRender(tokens, idx, options, env, self);
+
+				const encodedConfig = encodeURIComponent(token.content);
+
+				return (
+					`<div class="gtd-calendar-placeholder"` +
+					` data-content-script-id="${context.contentScriptId}"` +
+					` data-config="${encodedConfig}">` +
+					`<p class="gtd-calendar-loading">Loading GTD Calendar…</p>` +
+					`</div>`
+				);
+			};
+		},
+		assets: function () {
+			return [
+				{ name: "event-calendar.css" },
+				{ name: "gtd-calendar-webview.js" },
+			];
+		},
+	};
+}

src/gtd-calendar-webview.js

@@ -0,0 +1,130 @@
+/*
+ * GTD Calendar — webview script.
+ *
+ * Runs inside Joplin's rendered-note webview. Finds gtd-calendar
+ * placeholders emitted by the markdown-it content script, asks the main
+ * plugin process for event data, and renders the result.
+ *
+ * Phase 1: the plugin returns a hardcoded payload; this script renders a
+ * simple debug view proving the full round trip, including click-to-open
+ * drilldown.
+ */
+(function () {
+	"use strict";
+
+	function processPlaceholders() {
+		const placeholders = document.querySelectorAll(
+			".gtd-calendar-placeholder:not([data-gtd-processed])"
+		);
+
+		placeholders.forEach(function (el) {
+			el.setAttribute("data-gtd-processed", "true");
+
+			const contentScriptId = el.getAttribute("data-content-script-id");
+			const rawConfig = decodeURIComponent(
+				el.getAttribute("data-config") || ""
+			);
+
+			if (
+				typeof webviewApi === "undefined" ||
+				typeof webviewApi.postMessage !== "function"
+			) {
+				renderError(
+					el,
+					"GTD Calendar: webview messaging is unavailable. " +
+						"This plugin requires Joplin 2.7 or newer (desktop)."
+				);
+				return;
+			}
+
+			webviewApi
+				.postMessage(contentScriptId, {
+					type: "getEvents",
+					rawConfig: rawConfig,
+				})
+				.then(function (payload) {
+					if (!payload) {
+						renderError(el, "GTD Calendar: empty response from plugin.");
+						return;
+					}
+					renderPayload(el, payload, contentScriptId);
+				})
+				.catch(function (error) {
+					renderError(el, "GTD Calendar: " + String(error));
+				});
+		});
+	}
+
+	function renderError(el, message) {
+		el.innerHTML = "";
+		const box = document.createElement("div");
+		box.className = "gtd-calendar-error";
+		box.textContent = message;
+		el.appendChild(box);
+	}
+
+	function renderPayload(el, payload, contentScriptId) {
+		el.innerHTML = "";
+
+		const box = document.createElement("div");
+		box.className = "gtd-calendar-debug";
+
+		const heading = document.createElement("h3");
+		heading.textContent =
+			(payload.title || "GTD Calendar") + " — Phase 1 plumbing test";
+		box.appendChild(heading);
+
+		const meta = document.createElement("p");
+		meta.className = "gtd-calendar-debug-meta";
+		const noteInfo = payload.sourceNote
+			? '"' + payload.sourceNote.title + '" (' + payload.sourceNote.id + ")"
+			: "unknown";
+		meta.textContent =
+			"view: " +
+			(payload.view || "?") +
+			" · rendered in note: " +
+			noteInfo;
+		box.appendChild(meta);
+
+		if (payload.configError) {
+			const warn = document.createElement("p");
+			warn.className = "gtd-calendar-error";
+			warn.textContent = "Config problem: " + payload.configError;
+			box.appendChild(warn);
+		}
+
+		const list = document.createElement("ul");
+		list.className = "gtd-calendar-debug-events";
+
+		(payload.events || []).forEach(function (event) {
+			const item = document.createElement("li");
+
+			const glyph = event.isTodo ? (event.completed ? "☑ " : "☐ ") : "📄 ";
+			const dateLabel = event.date ? event.date : "unscheduled";
+			item.textContent = glyph + event.title + " — " + dateLabel;
+
+			if (event.id) {
+				item.classList.add("gtd-calendar-clickable");
+				item.title = "Click to open this note";
+				item.addEventListener("click", function () {
+					webviewApi.postMessage(contentScriptId, {
+						type: "openNote",
+						noteId: event.id,
+					});
+				});
+			}
+
+			list.appendChild(item);
+		});
+
+		box.appendChild(list);
+		el.appendChild(box);
+	}
+
+	processPlaceholders();
+
+	// Joplin may replace rendered content without re-running asset scripts;
+	// watch for new placeholders arriving in the DOM.
+	const observer = new MutationObserver(processPlaceholders);
+	observer.observe(document.body, { childList: true, subtree: true });
+})();

src/index.ts

@@ -1,12 +1,120 @@
 import joplin from "api";
 import { ContentScriptType } from "api/types";
 
+const YAML = require("yaml");
+
+const CONTENT_SCRIPT_ID = "gtd-calendar-renderer";
+
+function todayISO(): string {
+	return new Date().toISOString().slice(0, 10);
+}
+
 joplin.plugins.register({
 	onStart: async function () {
 		await joplin.contentScripts.register(
 			ContentScriptType.MarkdownItPlugin,
-			"joplin-plugin-event-calendar",
-			"./joplin-plugin-event-calendar.js"
+			CONTENT_SCRIPT_ID,
+			"./gtd-calendar-renderer.js"
+		);
+
+		await joplin.contentScripts.onMessage(
+			CONTENT_SCRIPT_ID,
+			async (message: any) => {
+				if (!message || !message.type) return null;
+
+				switch (message.type) {
+					case "getEvents":
+						return handleGetEvents(message);
+					case "openNote":
+						return handleOpenNote(message);
+					default:
+						return null;
+				}
+			}
 		);
 	},
 });
+
+/**
+ * Phase 1: parse the gtd-calendar config for real, but return hardcoded
+ * events. Proves: config transit, YAML parsing in the main process, data
+ * API access (selectedNote), and the response path back to the webview.
+ *
+ * Phase 2 replaces the hardcoded events with folder-scoped note/todo
+ * collection per SPEC.md.
+ */
+async function handleGetEvents(message: { rawConfig?: string }) {
+	let config: any = {};
+	let configError: string | null = null;
+
+	try {
+		config = YAML.parse(message.rawConfig || "") || {};
+	} catch (error) {
+		configError = String(error);
+	}
+
+	let sourceNote: { id: string; title: string; parentId: string } | null =
+		null;
+	try {
+		const note = await joplin.workspace.selectedNote();
+		if (note) {
+			sourceNote = {
+				id: note.id,
+				title: note.title,
+				parentId: note.parent_id,
+			};
+		}
+	} catch (error) {
+		// Non-fatal in Phase 1; the debug view reports "unknown".
+		console.warn("gtd-calendar: could not resolve selected note", error);
+	}
+
+	return {
+		phase: 1,
+		title: typeof config.title === "string" ? config.title : "GTD Calendar",
+		view: typeof config.view === "string" ? config.view : "day",
+		config,
+		configError,
+		sourceNote,
+		events: [
+			{
+				id: sourceNote ? sourceNote.id : null,
+				title: "Drilldown test — opens this very note",
+				date: todayISO(),
+				isTodo: false,
+				completed: false,
+			},
+			{
+				id: null,
+				title: "Hardcoded todo",
+				date: todayISO(),
+				isTodo: true,
+				completed: false,
+			},
+			{
+				id: null,
+				title: "Hardcoded completed todo",
+				date: todayISO(),
+				isTodo: true,
+				completed: true,
+			},
+			{
+				id: null,
+				title: "Hardcoded unscheduled note",
+				date: null,
+				isTodo: false,
+				completed: false,
+			},
+		],
+	};
+}
+
+async function handleOpenNote(message: { noteId?: string }) {
+	if (!message.noteId) return { ok: false, error: "No noteId provided" };
+	try {
+		await joplin.commands.execute("openNote", message.noteId);
+		return { ok: true };
+	} catch (error) {
+		return { ok: false, error: String(error) };
+	}
+}

src/joplin-plugin-event-calendar.ts

@@ -1,46 +0,0 @@
-const YAML = require("yaml");
-
-import Calendar from "./Calendar/";
-
-export default function () {
-  return {
-    plugin: function (markdownIt: any) {
-      const defaultRender: Function =
-        markdownIt.renderer.rules.fence ||
-        function (
-          tokens: any[],
-          idx: number,
-          options: any,
-          env: any,
-          self: any
-        ) {
-          return self.renderToken(tokens, idx, options, env, self);
-        };
-
-      markdownIt.renderer.rules.fence = function (
-        tokens: any[],
-        idx: number,
-        options: {},
-        env: any,
-        self: any
-      ) {
-        const token = tokens[idx];
-        if (token.info !== "joplin-plugin-event-calendar")
-          return defaultRender(tokens, idx, options, env, self);
-        try {
-          const jsonContent = YAML.parse(
-            markdownIt.utils.escapeHtml(token.content)
-          );
-          const calendar = new Calendar(jsonContent);
-          const contentHtml = calendar.render();
-          return `<div class="joplin-editable">${contentHtml.outerHTML}</div>`;
-        } catch (error) {
-          console.log(error);
-        }
-      };
-    },
-    assets: function () {
-      return [{ name: "event-calendar.css" }];
-    },
-  };
-}