1 files changed, 80 insertions, 0 deletions
diff --git a/Userland/DevTools/HackStudio/Git/DiffViewer.h b/Userland/DevTools/HackStudio/Git/DiffViewer.h
new file mode 100644
index 0000000000..1cc293e63d
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+++ b/Userland/DevTools/HackStudio/Git/DiffViewer.h
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+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <AK/String.h>
+#include <AK/Vector.h>
+#include <LibDiff/Hunks.h>
+#include <LibGUI/ScrollableWidget.h>
+
+namespace HackStudio {
+class DiffViewer final : public GUI::ScrollableWidget {
+    C_OBJECT(DiffViewer)
+public:
+    virtual ~DiffViewer() override;
+
+    void set_content(const String& original, const String& diff);
+
+private:
+    DiffViewer(const String& original, const String& diff);
+    DiffViewer();
+
+    void setup_properties();
+
+    virtual void paint_event(GUI::PaintEvent&) override;
+    virtual void resize_event(GUI::ResizeEvent&) override;
+
+    void update_content_size();
+
+    enum class LinePosition {
+        Left,
+        Right,
+        Both,
+    };
+
+    enum class LineType {
+        Normal,
+        Diff,
+        Missing,
+    };
+
+    void draw_line(GUI::Painter&, const String& line, size_t y_offset, LinePosition, LineType);
+
+    static Vector<String> split_to_lines(const String& text);
+
+    static Gfx::Color red_background();
+    static Gfx::Color green_background();
+    static Gfx::Color gray_background();
+
+    size_t line_height() const;
+
+    Gfx::IntRect separator_rect() const;
+
+    Vector<String> m_original_lines;
+    Vector<Diff::Hunk> m_hunks;
+};
+}