Refactor: move HTML->Markdown conversion to Rust from TypeScript.

Author: bjones1

client/src/CodeChatEditor-test.mts

@@ -42,7 +42,7 @@ import {
 // Nothing needed at present.
 //
 // Provide convenient access to all functions tested here.
-const { codechat_html_to_markdown } = exportedForTesting;
+const {} = exportedForTesting;
 
 // From [SO](https://stackoverflow.com/a/39914235).
 const sleep = (ms: number) => new Promise((r) => setTimeout(r, ms));
@@ -74,55 +74,6 @@ window.CodeChatEditor_test = () => {
     // Define some tests. See the [Mocha TDD docs](https://mochajs.org/#tdd) and
     // the [Chai assert API](https://www.chaijs.com/api/assert/).
     suite("CodeChatEditor.mts", function () {
-        suite("codechat_html_to_markdown", function () {
-            test("Translate an empty comment", async function () {
-                const db: [CodeMirrorDocBlockTuple] = [[0, 0, "", "//", ""]];
-                codechat_html_to_markdown(db);
-                assert.deepEqual(db, [[0, 0, "", "//", "\n"]]);
-            });
-
-            test("Translate non-breaking space", async function () {
-                const db: [CodeMirrorDocBlockTuple] = [
-                    [0, 0, "", "//", " "],
-                ];
-                codechat_html_to_markdown(db);
-                assert.deepEqual(db, [[0, 0, "", "//", "\n"]]);
-            });
-
-            test("Translate two empty comments", async function () {
-                const db: CodeMirrorDocBlockTuple[] = [
-                    [0, 0, "", "//", ""],
-                    [2, 2, "", "//", ""],
-                ];
-                const source = {
-                    doc_blocks: db,
-                };
-                codechat_html_to_markdown(db);
-                assert.deepEqual(db, [
-                    [0, 0, "", "//", "\n"],
-                    [2, 2, "", "//", "\n"],
-                ]);
-            });
-
-            test("Translate unclosed HTML", async function () {
-                const db: CodeMirrorDocBlockTuple[] = [
-                    [0, 0, "", "//", "<h1><u>A<u></h1>\n"],
-                    [2, 2, "", "//", "<h2>Ax</h2>"],
-                ];
-                codechat_html_to_markdown(db);
-                assert.deepEqual(db, [
-                    [
-                        0,
-                        0,
-                        "",
-                        "//",
-                        "<u>A<u></u></u>\n===============\n\n<u><u></u></u>\n",
-                    ],
-                    [2, 2, "", "//", "Ax\n--\n"],
-                ]);
-            });
-        });
-
         suite("CodeMirror checks", function () {
             test("insert/delete/replace expectations", function () {
                 // Create a div to hold an editor.

client/src/CodeChatEditor.mts

@@ -44,8 +44,6 @@
 // ### JavaScript/TypeScript
 //
 // #### Third-party
-import TurndownService from "./third-party/turndown/turndown.browser.es.mjs";
-import { gfm } from "./third-party/turndown/turndown-plugin-gfm.browser.es.js";
 import "./third-party/wc-mermaid/wc-mermaid";
 
 // #### Local
@@ -153,22 +151,6 @@ let current_metadata: {
 // True if the document is dirty (needs saving).
 let is_dirty = false;
 
-// ### Markdown to HTML conversion
-//
-// Instantiate[turndown](https://github.com/mixmark-io/turndown) for HTML to
-// Markdown conversion
-const turndownService = new TurndownService({
-    br: "\\",
-    codeBlockStyle: "fenced",
-    renderAsPure: false,
-    wordWrap: [80, 40],
-});
-
-// Add the plugins
-// from[turndown-plugin-gfm](https://github.com/laurent22/joplin/tree/dev/packages/turndown-plugin-gfm)
-// to enable conversions for tables, task lists, and strikethroughs.
-turndownService.use(gfm);
-
 // Page initialization
 // -------------------
 export const set_is_dirty = (value: boolean = true) => {
@@ -351,15 +333,14 @@ const save_lp = (is_dirty: boolean) => {
                     Plain: CodeMirror;
                 }
             ).Plain = {
-                doc: turndownService.turndown(html),
+                doc: html,
                 doc_blocks: [],
             };
             // Retypeset all math after saving the document.
             mathJaxTypeset(codechat_body);
         } else {
             code_mirror_diffable = CodeMirror_save();
             assert("Plain" in code_mirror_diffable);
-            codechat_html_to_markdown(code_mirror_diffable.Plain.doc_blocks);
         }
         update.contents = {
             metadata: current_metadata,
@@ -396,22 +377,6 @@ const on_save = async (only_if_dirty: boolean = false) => {
     is_dirty = false;
 };
 
-const codechat_html_to_markdown = (doc_blocks: CodeMirrorDocBlockTuple[]) => {
-    const entries = doc_blocks.entries();
-    for (const [index, doc_block] of entries) {
-        const wordWrapMargin = Math.max(
-            40,
-            80 - doc_block[3].length - doc_block[2].length - 1,
-        );
-        turndownService.options["wordWrap"] = [wordWrapMargin, 40];
-        doc_block[4] =
-            (index == doc_blocks.length - 1
-                ? turndownService.last(doc_block[4])
-                : turndownService.next(doc_block[4])) + "\n";
-    }
-    turndownService.options["wordWrap"] = [80, 40];
-};
-
 // ### Autosave feature
 //
 // Schedule an autosave; call this whenever the document is modified.
@@ -589,6 +554,4 @@ on_dom_content_loaded(async () => {
 // wrap all testing exports in a single variable. This avoids namespace
 // pollution, since only one name is exported, and it's clearly marked for
 // testing only. Test code still gets access to everything it needs.
-export const exportedForTesting = {
-    codechat_html_to_markdown,
-};
+export const exportedForTesting = {};