Fix issue with relative paths and allow multiple on command line

Fixes #639
Fixes #591

public/electron.js

@@ -24,9 +24,8 @@ let mainWindow;
 let askBeforeClose = false;
 let rendererReady = false;
 
-function openFile(path) {
-  mainWindow.webContents.send('file-opened', [path]);
-}
+const openFiles = (paths) => mainWindow.webContents.send('file-opened', paths);
+const openFile = (path) => openFile([path]);
 
 function createWindow() {
   mainWindow = new BrowserWindow({
@@ -111,16 +110,23 @@ let openFileInitial;
 
 electron.ipcMain.on('renderer-ready', () => {
   rendererReady = true;
-  if (!isDev) {
-    // Take the last argument, but ONLY if there is more than one argv (first one is the LosslessCut executable)
-    const fileToOpen = process.argv.length > 1 && process.argv[process.argv.length - 1];
-    // https://github.com/electron/electron/issues/3657
-    // https://github.com/mifi/lossless-cut/issues/357
-    if (fileToOpen && !fileToOpen.startsWith('-')) openFile(fileToOpen);
-  }
-  if (openFileInitial) openFile(openFileInitial);
+  const ignoreFirstArgs = isDev ? 2 : 1;
+  // production: First arg is the LosslessCut executable
+  // dev: First 2 args are electron and the electron.js
+
+  // https://github.com/electron/electron/issues/3657
+  // https://github.com/mifi/lossless-cut/issues/357
+  // https://github.com/mifi/lossless-cut/issues/639
+  // https://github.com/mifi/lossless-cut/issues/591
+  const filesToOpen = process.argv.length > ignoreFirstArgs
+    ? process.argv.slice(ignoreFirstArgs).filter((arg) => arg && !arg.startsWith('-'))
+    : [];
+
+  if (filesToOpen.length > 0) openFiles(filesToOpen);
+  else if (openFileInitial) openFile(openFileInitial);
 });
 
+// Mac OS open with LosslessCut
 app.on('open-file', (event, path) => {
   if (rendererReady) openFile(path);
   else openFileInitial = path;

src/App.jsx

@@ -66,7 +66,7 @@ const isDev = window.require('electron-is-dev');
 const electron = window.require('electron'); // eslint-disable-line
 const trash = window.require('trash');
 const { unlink, exists } = window.require('fs-extra');
-const { extname, parse: parsePath, sep: pathSep, join: pathJoin, normalize: pathNormalize } = window.require('path');
+const { extname, parse: parsePath, sep: pathSep, join: pathJoin, normalize: pathNormalize, resolve: pathResolve, isAbsolute: pathIsAbsolute } = window.require('path');
 
 const { dialog, app } = electron.remote;
 
@@ -1476,7 +1476,13 @@ const App = memo(() => {
     setCopyStreamIdsForPath(path, () => fromPairs(streams.map(({ index }) => [index, true])));
   }, [externalStreamFiles]);
 
-  const userOpenFiles = useCallback(async (filePaths) => {
+  const userOpenFiles = useCallback(async (filePathsRaw) => {
+    console.log('userOpenFiles');
+    console.log(filePathsRaw.join('\n'));
+
+    // Need to resolve relative paths https://github.com/mifi/lossless-cut/issues/639
+    const filePaths = filePathsRaw.map((path) => (pathIsAbsolute(path) ? path : pathResolve(path)));
+
     if (filePaths.length < 1) return;
     if (filePaths.length > 1) {
       showMergeDialog(filePaths, mergeFiles);