From 609064fa5aedab6efb4e1409fbbe0f2888c4ec89 Mon Sep 17 00:00:00 2001
From: Ziteng Wang <z@wzt.me>
Date: Sat, 2 Apr 2022 19:07:40 -0700
Subject: [PATCH] Add support for open-with feature

---
 pdf_viewer/OpenWithApplication.h | 22 ++++++++++++++++++
 pdf_viewer/main.cpp              | 19 +++++++++++++++-
 pdf_viewer_build_config.pro      |  4 +++-
 resources/Info.plist             | 39 ++++++++++++++++++++++++++++++++
 4 files changed, 82 insertions(+), 2 deletions(-)
 create mode 100644 pdf_viewer/OpenWithApplication.h
 create mode 100644 resources/Info.plist

diff --git a/pdf_viewer/OpenWithApplication.h b/pdf_viewer/OpenWithApplication.h
new file mode 100644
index 000000000..f78e32f04
--- /dev/null
+++ b/pdf_viewer/OpenWithApplication.h
@@ -0,0 +1,22 @@
+#ifndef OPEN_WITH_APP_H
+#define OPEN_WITH_APP_H
+
+#include <qapplication.h>
+
+class OpenWithApplication : public QApplication
+{
+	Q_OBJECT
+public:
+	QString file_name;
+    OpenWithApplication(int &argc, char **argv)
+        : QApplication(argc, argv)
+    {
+    }
+signals:
+    void fileReady(QString fn);
+
+protected:
+    bool event(QEvent *event) override;
+};
+
+#endif // OPEN_WITH_APP_H
\ No newline at end of file
diff --git a/pdf_viewer/main.cpp b/pdf_viewer/main.cpp
index c24fa1630..e43915903 100644
--- a/pdf_viewer/main.cpp
+++ b/pdf_viewer/main.cpp
@@ -74,6 +74,7 @@
 #include "path.h"
 #include "RunGuard.h"
 #include "checksum.h"
+#include "OpenWithApplication.h"
 
 #define FTS_FUZZY_MATCH_IMPLEMENTATION
 #include "fts_fuzzy_match.h"
@@ -357,6 +358,17 @@ void add_paths_to_file_system_watcher(QFileSystemWatcher& watcher, const Path& d
     }
 }
 
+bool OpenWithApplication::event(QEvent *event)
+{
+	if (event->type() == QEvent::FileOpen) {
+		QFileOpenEvent *openEvent = static_cast<QFileOpenEvent *>(event);
+		file_name = openEvent->file();
+		emit fileReady(file_name); //  the file is ready
+	}
+
+	return QApplication::event(event);
+}
+
 int main(int argc, char* args[]) {
 
 	QSurfaceFormat format;
@@ -365,7 +377,7 @@ int main(int argc, char* args[]) {
 	QSurfaceFormat::setDefaultFormat(format);
 
 	QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts, true);
-	QApplication app(argc, args);
+	OpenWithApplication app(argc, args);
 
     QCommandLineParser* parser = get_command_line_parser();
     parser->process(app.arguments());
@@ -488,6 +500,11 @@ int main(int argc, char* args[]) {
 
 	main_widget.handle_args(app.arguments());
 
+	// load input file from `QFileOpenEvent` for macOS drag and drop & "open with"
+	QObject::connect(&app, &OpenWithApplication::fileReady, [&main_widget](QString fileName) {
+		main_widget.open_document(fileName.toStdWString());
+	});
+
     // live reload the config files
 	QObject::connect(&pref_file_watcher, &QFileSystemWatcher::fileChanged, [&]() {
 
diff --git a/pdf_viewer_build_config.pro b/pdf_viewer_build_config.pro
index 0b30ef80b..296016f28 100644
--- a/pdf_viewer_build_config.pro
+++ b/pdf_viewer_build_config.pro
@@ -37,7 +37,8 @@ HEADERS += pdf_viewer/book.h \
            pdf_viewer/utf8/unchecked.h \
            pdf_viewer/synctex/synctex_parser.h \
            pdf_viewer/synctex/synctex_parser_utils.h \
-           pdf_viewer/RunGuard.h
+           pdf_viewer/RunGuard.h \
+           pdf_viewer/OpenWithApplication.h
 
 SOURCES += pdf_viewer/book.cpp \
            pdf_viewer/config.cpp \
@@ -92,5 +93,6 @@ mac {
     CONFIG+=sdk_no_version_check
     QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.15
     ICON = pdf_viewer\icon2.ico
+    QMAKE_INFO_PLIST = resources/Info.plist
 }
 
diff --git a/resources/Info.plist b/resources/Info.plist
new file mode 100644
index 000000000..6c9898ce9
--- /dev/null
+++ b/resources/Info.plist
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleExecutable</key>
+	<string>sioyek</string>
+	<key>CFBundleIconFile</key>
+	<string>icon2.ico</string>
+	<key>CFBundleIdentifier</key>
+	<string>info.sioyek.sioyek</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.1.0</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>10.15</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+	<key>NSSupportsAutomaticGraphicsSwitching</key>
+	<true/>
+	<key>CFBundleDocumentTypes</key>
+    <array>
+        <dict>
+			<key>CFBundleTypeName</key>
+			<string>PDF Document</string>
+			<key>CFBundleTypeRole</key>
+			<string>Viewer</string>
+			<key>LSHandlerRank</key>
+			<string>Alternate</string>
+			<key>LSItemContentTypes</key>
+			<array>
+				<string>com.adobe.pdf</string>
+			</array>
+		</dict>
+    </array>
+</dict>
+</plist>