Merge pull request #68 from 0916dhkim/command-line-args

Open File By Command Line Argument

src/common/event.tsx

@@ -1,11 +1,13 @@
 export type EventType =
+  | "ON-INITIALIZE"
   | "ON-CLOSE"
   | "ON-NEW-FILE-MENU"
   | "ON-OPEN-FILE-MENU"
   | "ON-SAVE-MENU"
   | "ON-SAVE-AS-MENU";
 
 export type EventOptions<T extends EventType> = { type: T } & {
+  "ON-INITIALIZE": { processArgs: Array<string> };
   "ON-CLOSE": {};
   "ON-NEW-FILE-MENU": {};
   "ON-OPEN-FILE-MENU": {};

src/common/request.tsx

@@ -1,4 +1,5 @@
 export type RequestType =
+  | "INVOKE-INITIALIZATION"
   | "GET-VERSION"
   | "CLOSE-WINDOW"
   | "SHOW-OPEN-DIALOG"
@@ -8,6 +9,7 @@ export type RequestType =
   | "SHOW-ERROR-MESSAGE";
 
 export type RequestOptions<T extends RequestType> = { type: T } & {
+  "INVOKE-INITIALIZATION": {};
   "GET-VERSION": {};
   "CLOSE-WINDOW": {};
   "SHOW-OPEN-DIALOG": {};
@@ -28,6 +30,7 @@ export type WarningMessageOption = "OK" | "Cancel";
 export type OverrideWarningOption = "Save" | "Don't Save" | "Cancel";
 
 export type Response<T extends RequestType> = {
+  "INVOKE-INITIALIZATION": void;
   "GET-VERSION": string;
   "CLOSE-WINDOW": void;
   "SHOW-OPEN-DIALOG": string | null;

src/main/index.tsx

@@ -10,13 +10,23 @@ import {
 } from "../common/request";
 import * as path from "path";
 import { format as formatUrl } from "url";
+import { EventEmitter } from "../common/event";
 
 const isDevelopment = process.env.NODE_ENV !== "production";
 
 // global reference to mainWindow (necessary to prevent window from being garbage collected)
 let mainWindow: BrowserWindow | null = null;
 let closeRequestReceived = false;
 
+async function invokeInitializationRequestHandler(
+  emit: EventEmitter
+): Promise<Response<"INVOKE-INITIALIZATION">> {
+  emit({
+    type: "ON-INITIALIZE",
+    processArgs: process.argv
+  });
+}
+
 async function getVersionRequestHandler(): Promise<Response<"GET-VERSION">> {
   return app.getVersion();
 }
@@ -160,6 +170,10 @@ function createMainWindow(): BrowserWindow {
     });
   });
 
+  registerRequestHandler(
+    "INVOKE-INITIALIZATION",
+    invokeInitializationRequestHandler.bind(null, emit)
+  );
   registerRequestHandler("GET-VERSION", getVersionRequestHandler);
   registerRequestHandler("CLOSE-WINDOW", closeRequestHandler);
   registerRequestHandler("SHOW-OPEN-DIALOG", showOpenDialogRequestHandler);

src/renderer/root.tsx

@@ -15,7 +15,7 @@ import { Container, Segment } from "semantic-ui-react";
 import { Request } from "../common/request";
 import { RequestContext } from "./request_context";
 import { castDraft, produce } from "../common/persistence/immer-initialized";
-import { UseEventHandler } from "../common/event";
+import { UseEventHandler, EventOptions } from "../common/event";
 import { WelcomeView } from "./welcome_view";
 
 export interface RootProps {
@@ -99,6 +99,39 @@ const contentViews: ContentViewElementInterface[] = [
   }
 ];
 
+/**
+ * Deserialize a file into app data.
+ * @param path Path of a file to read app data from.
+ * @returns the deserialized app data. `null` if failed.
+ */
+function getAppDataFromFile(path: string): AppData | null {
+  try {
+    const fileContent = fs.readFileSync(path, { encoding: "utf8" });
+    return deserializeAppData(fileContent);
+  } catch {
+    return null;
+  }
+}
+
+async function initializeHandler(
+  dispatch: React.Dispatch<RootAction>,
+  { processArgs }: EventOptions<"ON-INITIALIZE">
+): Promise<void> {
+  if (processArgs.length < 2) {
+    // No process argument provided.
+    return;
+  }
+  // The first process argument is a path of an app data file.
+  // Deserialize the file to initialize this Root component.
+  const path = processArgs[1];
+  const deserializedData = getAppDataFromFile(path);
+  if (deserializedData === null) {
+    return;
+  }
+  dispatch({ type: "Open File", fileData: deserializedData, filePath: path });
+  return;
+}
+
 /**
  * @param state Root component state.
  * @returns `true` if there is any unsaved changes. `false` otherwise.
@@ -250,8 +283,7 @@ async function openFileMenuHandler(
     if (await ensureSafeToOverrideAppData(request, dispatch, state)) {
       const file = await request({ type: "SHOW-OPEN-DIALOG" });
       if (file !== null) {
-        const fileContent = fs.readFileSync(file, { encoding: "utf8" });
-        const appDataFromFile = deserializeAppData(fileContent);
+        const appDataFromFile = getAppDataFromFile(file);
         if (appDataFromFile === null) {
           throw "Failed to deserialize file.";
         }
@@ -277,6 +309,13 @@ export function Root({
     contentViewIndex: 0,
     currentFilePath: null
   });
+
+  // Request for initialization event from main process.
+  React.useEffect(() => {
+    request({ type: "INVOKE-INITIALIZATION" });
+  }, [request]);
+
+  useEventHandler("ON-INITIALIZE", initializeHandler.bind(null, dispatch));
   useEventHandler(
     "ON-CLOSE",
     closeHandler.bind(null, request, dispatch, state)