API: Allow ns.read to read .msg and .lit files (#2455)

src/NetscriptFunctions.ts

@@ -109,6 +109,9 @@ import { compile } from "./NetscriptJSEvaluator";
 import { Script } from "./Script/Script";
 import { NetscriptFormat } from "./NetscriptFunctions/Format";
 import { FragmentTypeEnum } from "./CotMG/FragmentType";
+import { renderToStaticMarkup } from "react-dom/server";
+import { Literatures } from "./Literature/Literatures";
+import { Messages } from "./Message/MessageHelpers";
 
 export const enums: NSEnums = {
   CityName,
@@ -1083,8 +1086,23 @@ export const ns: InternalAPI<NSFull> = {
   },
   read: (ctx) => (_filename) => {
     const path = helpers.filePath(ctx, "filename", _filename);
-    if (!hasScriptExtension(path) && !hasTextExtension(path)) return "";
     const server = ctx.workerScript.getServer();
+    const isLiterature = path.endsWith(".lit");
+    const isMessage = path.endsWith(".msg");
+    if (isLiterature || isMessage) {
+      if (!server.messages.includes(path as LiteratureName | MessageFilename)) {
+        helpers.log(ctx, () => `${path} does not exist on ${server.hostname}.`);
+        return "";
+      }
+      return isLiterature
+        ? renderToStaticMarkup(Literatures[path as LiteratureName].text)
+        : Messages[path as MessageFilename].msg;
+    }
+
+    if (!hasScriptExtension(path) && !hasTextExtension(path)) {
+      helpers.log(ctx, () => `${path} does not exist on ${server.hostname}.`);
+      return "";
+    }
     return server.getContentFile(path)?.content ?? "";
   },
   getFileMetadata: (ctx) => (_filename) => {

src/ScriptEditor/NetscriptDefinitions.d.ts

@@ -7862,10 +7862,13 @@ export interface NS {
    * @remarks
    * RAM cost: 0 GB
    *
-   * This function is used to read data from a text file (.txt, .json, .css) or script (.js, .jsx, .ts, .tsx).
+   * This function is used to read data from a text file (.txt, .json, .css), a script (.js, .jsx, .ts, .tsx), a
+   * literature file (.lit), or a message (.msg).
    *
-   * This function will return the data in the specified file.
-   * If the file does not exist, an empty string will be returned.
+   * This function will return the data in the specified file. If the file does not exist, an empty string will be
+   * returned.
+   *
+   * With literature files, the returned data is a raw HTML string.
    *
    * @param filename - Name of the file to be read.
    * @returns Data in the specified text file.