editor: Add basic loading and saving

editor/EditorWidget.cpp

@@ -31,6 +31,11 @@ Result<void> EditorWidget::load_file(const os::Path& path)
 
     m_cursor = m_data.size();
 
+    m_path = path;
+
+    String title = TRY(String::format("Text Editor - %s"_sv, m_path.name().chars()));
+    ui::App::the().main_window()->set_title(title.view());
+
     TRY(recalculate_lines());
 
     return {};
@@ -46,7 +51,9 @@ Result<ui::EventResult> EditorWidget::handle_key_event(const ui::KeyEventRequest
         if (request.code == moon::K_Esc)
         {
             m_insert = false;
-            ui::App::the().main_window()->set_title("Text Editor");
+            String title = TRY(String::from_cstring("Text Editor"));
+            if (!m_path.is_empty_path()) title = TRY(String::format("Text Editor - %s"_sv, m_path.name().chars()));
+            ui::App::the().main_window()->set_title(title.view());
         }
 
         if (request.code == moon::K_Backspace)
@@ -127,13 +134,37 @@ Result<ui::EventResult> EditorWidget::handle_key_event(const ui::KeyEventRequest
     }
     case 'i': {
         m_insert = true;
-        ui::App::the().main_window()->set_title("Text Editor (insert)");
+        String title = TRY(String::from_cstring("Text Editor (insert)"));
+        if (!m_path.is_empty_path()) title = TRY(String::format("Text Editor - %s (insert)"_sv, m_path.name().chars()));
+        ui::App::the().main_window()->set_title(title.view());
         return ui::EventResult::DidHandle;
     }
+    case 'f': {
+        auto result = save_file();
+        if (result.has_error())
+        {
+            os::eprintln("TextEditor: failed to save file: %s", result.error_string());
+            return ui::EventResult::DidNotHandle;
+        }
+        os::println("TextEditor: buffer saved to %s successfully", m_path.name().chars());
+        return ui::EventResult::DidNotHandle;
+    }
     default: return ui::EventResult::DidNotHandle;
     }
 }
 
+Result<void> EditorWidget::save_file()
+{
+    if (m_path.is_empty_path())
+    {
+        os::eprintln("TextEditor: no file to save buffer to!");
+        return err(ENOENT);
+    }
+
+    auto file = TRY(os::File::open(m_path, os::File::WriteOnly));
+    return file->write(m_data);
+}
+
 Result<void> EditorWidget::draw(ui::Canvas& canvas)
 {
     int visible_lines = canvas.height / m_font->height();

editor/EditorWidget.h

@@ -19,6 +19,8 @@ class EditorWidget : public ui::Widget
 
     Result<void> load_file(const os::Path& path);
 
+    Result<void> save_file();
+
     Result<ui::EventResult> handle_key_event(const ui::KeyEventRequest& request) override;
 
     Result<void> draw(ui::Canvas& canvas) override;
@@ -43,6 +45,8 @@ class EditorWidget : public ui::Widget
 
     bool m_insert = false;
 
+    os::Path m_path { AT_FDCWD };
+
     void tick_cursor();
 
     Result<void> recalculate_lines();

editor/main.cpp

@@ -8,10 +8,19 @@
  */
 
 #include "EditorWidget.h"
+#include <os/ArgumentParser.h>
 #include <ui/App.h>
 
-Result<int> luna_main(int, char**)
+Result<int> luna_main(int argc, char** argv)
 {
+    StringView path;
+
+    os::ArgumentParser parser;
+    parser.add_description("A graphical text editor"_sv);
+    parser.add_system_program_info("editor"_sv);
+    parser.add_positional_argument(path, "path", false);
+    parser.parse(argc, argv);
+
     ui::App app;
     TRY(app.init());
 
@@ -21,7 +30,7 @@ Result<int> luna_main(int, char**)
     app.set_main_window(window);
 
     auto* editor = TRY(make<EditorWidget>(ui::Font::default_font()));
-    // TRY(editor->load_file("/etc/skel/welcome"));
+    if (!path.is_empty()) TRY(editor->load_file(path));
     window->set_main_widget(*editor);
 
     window->draw();