HackStudio: Add basic Git integration

This adds a "Git" tab to Hackstudio.
Currently has support for staging and unstaging files.

DevTools/HackStudio/Git/GitFilesView.cpp

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "GitFilesView.h"
+#include <LibGUI/Model.h>
+#include <LibGUI/Painter.h>
+#include <LibGUI/ScrollBar.h>
+#include <LibGfx/Palette.h>
+
+namespace HackStudio {
+GitFilesView::~GitFilesView()
+{
+}
+
+void GitFilesView::paint_list_item(GUI::Painter& painter, int row_index, int painted_item_index)
+{
+    ListView::paint_list_item(painter, row_index, painted_item_index);
+
+    painter.blit(action_icon_rect((size_t)painted_item_index).top_left(), *m_action_icon, m_action_icon->rect());
+}
+
+Gfx::IntRect GitFilesView::action_icon_rect(size_t painted_item_index)
+{
+    int y = painted_item_index * item_height();
+    return { content_width() - 20, y, m_action_icon->rect().width(), m_action_icon->rect().height() };
+}
+
+GitFilesView::GitFilesView(GitFileActionCallback callback, NonnullRefPtr<Gfx::Bitmap> action_icon)
+    : m_action_callback(move(callback))
+    , m_action_icon(action_icon)
+{
+    set_alternating_row_colors(false);
+}
+
+void GitFilesView::mousedown_event(GUI::MouseEvent& event)
+{
+    if (event.button() != GUI::MouseButton::Left) {
+        ListView::mousedown_event(event);
+        return;
+    }
+
+    if (event.x() < action_icon_rect(0).x() || event.x() > action_icon_rect(0).top_right().x()) {
+        ListView::mousedown_event(event);
+        return;
+    }
+
+    size_t item_index = (event.y() + vertical_scrollbar().value()) / item_height();
+    if (model()->row_count() == 0 || item_index > (size_t)model()->row_count()) {
+        ListView::mousedown_event(event);
+        return;
+    }
+
+    auto data = model()->index(item_index, model_column()).data();
+
+    ASSERT(data.is_string());
+    m_action_callback(LexicalPath(data.to_string()));
+}
+
+};