feat: Support custom metadata extractors for tasks

src/api/plugin-api.ts

@@ -35,6 +35,7 @@ import { Query } from "query/query";
 import { DataviewCalendarRenderer } from "ui/views/calendar-view";
 import { DataviewJSRenderer } from "ui/views/js-view";
 import { markdownList, markdownTable, markdownTaskList } from "ui/export/markdown";
+import { extensionRegistry } from "util/extensionRegistry";
 
 /** Asynchronous API calls related to file / system IO. */
 export class DataviewIOApi {
@@ -87,6 +88,8 @@ export class DataviewApi {
     public widget = Widgets;
     /** Re-exporting of luxon for people who can't easily require it. Sorry! */
     public luxon = Luxon;
+    /** Programmatic extensions to tweak dataview behavior */
+    public extensionRegistry = extensionRegistry;
 
     public constructor(
         public app: App,

src/data-import/inline-field.ts

@@ -4,6 +4,7 @@ import { EXPRESSION } from "expression/parse";
 import { Literal } from "data-model/value";
 import * as P from "parsimmon";
 import emojiRegex from "emoji-regex";
+import { extensionRegistry } from "util/extensionRegistry";
 
 /** A parsed inline field. */
 export interface InlineField {
@@ -211,6 +212,14 @@ function extractSpecialTaskFields(line: string): InlineField[] {
         });
     }
 
+    for (const customExtractor of extensionRegistry._customSpecialTaskFieldExtractors) {
+        try {
+            results.push(customExtractor.exec(line));
+        } catch (ex) {
+            console.error(`Custom extractor ${customExtractor.name} failed to extract metadata`, ex, line);
+        }
+    }
+
     return results;
 }
 

src/util/extensionRegistry.ts

@@ -0,0 +1,15 @@
+import type { InlineField } from "data-import/inline-field";
+
+export interface CustomSpecialTaskFieldExtractor {
+    name: string;
+    exec: (line: string) => InlineField;
+}
+export class ExtensionRegistry {
+    _customSpecialTaskFieldExtractors: Array<CustomSpecialTaskFieldExtractor> = [];
+
+    addCustomSpecialTaskFieldExtractor(customExtractor: CustomSpecialTaskFieldExtractor) {
+        this._customSpecialTaskFieldExtractors.push(customExtractor);
+    }
+}
+
+export const extensionRegistry = new ExtensionRegistry();