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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "DiffViewer.h"
#include <AK/Debug.h>
#include <LibDiff/Hunks.h>
#include <LibGUI/AbstractView.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Scrollbar.h>
#include <LibGfx/Color.h>
#include <LibGfx/Font.h>
#include <LibGfx/FontDatabase.h>
#include <LibGfx/Palette.h>
namespace HackStudio {
DiffViewer::~DiffViewer()
{
}
void DiffViewer::paint_event(GUI::PaintEvent& event)
{
GUI::Painter painter(*this);
painter.add_clip_rect(widget_inner_rect());
painter.add_clip_rect(event.rect());
painter.fill_rect(event.rect(), palette().color(background_role()));
painter.translate(frame_thickness(), frame_thickness());
painter.translate(-horizontal_scrollbar().value(), -vertical_scrollbar().value());
// Why we need to translate here again? We've already translated the painter.
// Anyways, it paints correctly so I'll leave it like this.
painter.fill_rect_with_dither_pattern(
separator_rect().translated(horizontal_scrollbar().value(), vertical_scrollbar().value()),
Gfx::Color::LightGray,
Gfx::Color::White);
size_t y_offset = 10;
size_t current_original_line_index = 0;
for (const auto& hunk : m_hunks) {
for (size_t i = current_original_line_index; i < hunk.original_start_line; ++i) {
draw_line(painter, m_original_lines[i], y_offset, LinePosition::Both, LineType::Normal);
y_offset += line_height();
}
current_original_line_index = hunk.original_start_line + hunk.removed_lines.size();
size_t left_y_offset = y_offset;
for (const auto& removed_line : hunk.removed_lines) {
draw_line(painter, removed_line, left_y_offset, LinePosition::Left, LineType::Diff);
left_y_offset += line_height();
}
for (int i = 0; i < (int)hunk.added_lines.size() - (int)hunk.removed_lines.size(); ++i) {
draw_line(painter, "", left_y_offset, LinePosition::Left, LineType::Missing);
left_y_offset += line_height();
}
size_t right_y_offset = y_offset;
for (const auto& added_line : hunk.added_lines) {
draw_line(painter, added_line, right_y_offset, LinePosition::Right, LineType::Diff);
right_y_offset += line_height();
}
for (int i = 0; i < (int)hunk.removed_lines.size() - (int)hunk.added_lines.size(); ++i) {
draw_line(painter, "", right_y_offset, LinePosition::Right, LineType::Missing);
right_y_offset += line_height();
}
VERIFY(left_y_offset == right_y_offset);
y_offset = left_y_offset;
}
for (size_t i = current_original_line_index; i < m_original_lines.size(); ++i) {
draw_line(painter, m_original_lines[i], y_offset, LinePosition::Both, LineType::Normal);
y_offset += line_height();
}
}
void DiffViewer::draw_line(GUI::Painter& painter, const String& line, size_t y_offset, LinePosition line_position, LineType line_type)
{
size_t line_width = font().width(line);
constexpr size_t padding = 10;
size_t left_side_x_offset = padding;
size_t right_side_x_offset = separator_rect().x() + padding;
// FIXME: Long lines will overflow out of their side of the diff view
Gfx::IntRect left_line_rect { (int)left_side_x_offset, (int)y_offset, (int)line_width, (int)line_height() };
Gfx::IntRect right_line_rect { (int)right_side_x_offset, (int)y_offset, (int)line_width, (int)line_height() };
auto color = palette().color(foreground_role());
if (line_position == LinePosition::Left || line_position == LinePosition::Both) {
painter.draw_text(left_line_rect, line, Gfx::TextAlignment::TopLeft, color);
if (line_type != LineType::Normal) {
Gfx::IntRect outline = { (int)left_side_x_offset, ((int)y_offset) - 2, separator_rect().x() - (int)(padding * 2), (int)line_height() };
if (line_type == LineType::Diff) {
painter.fill_rect(
outline,
red_background());
}
if (line_type == LineType::Missing) {
painter.fill_rect(
outline,
gray_background());
}
}
}
if (line_position == LinePosition::Right || line_position == LinePosition::Both) {
painter.draw_text(right_line_rect, line, Gfx::TextAlignment::TopLeft, color);
if (line_type != LineType::Normal) {
Gfx::IntRect outline = { (int)right_side_x_offset, ((int)y_offset) - 2, frame_inner_rect().width() - separator_rect().x() - (int)(padding * 2) - 10, (int)line_height() };
if (line_type == LineType::Diff) {
painter.fill_rect(
outline,
green_background());
}
if (line_type == LineType::Missing) {
painter.fill_rect(
outline,
gray_background());
}
}
}
}
size_t DiffViewer::line_height() const
{
return font().glyph_height() + 4;
}
Gfx::IntRect DiffViewer::separator_rect() const
{
return Gfx::IntRect { frame_inner_rect().width() / 2 - 2,
0,
4,
frame_inner_rect().height() };
}
void DiffViewer::set_content(const String& original, const String& diff)
{
m_original_lines = split_to_lines(original);
m_hunks = Diff::parse_hunks(diff);
if constexpr (DIFF_DEBUG) {
for (size_t i = 0; i < m_original_lines.size(); ++i)
dbgln("{}:{}", i, m_original_lines[i]);
}
}
DiffViewer::DiffViewer()
{
setup_properties();
}
DiffViewer::DiffViewer(const String& original, const String& diff)
: m_original_lines(split_to_lines(original))
, m_hunks(Diff::parse_hunks(diff))
{
setup_properties();
}
void DiffViewer::setup_properties()
{
set_font(Gfx::FontDatabase::default_fixed_width_font());
set_background_role(ColorRole::Base);
set_foreground_role(ColorRole::BaseText);
}
Vector<String> DiffViewer::split_to_lines(const String& text)
{
// NOTE: This is slightly different than text.split('\n')
Vector<String> lines;
size_t next_line_start_index = 0;
for (size_t i = 0; i < text.length(); ++i) {
if (text[i] == '\n') {
auto line_text = text.substring(next_line_start_index, i - next_line_start_index);
lines.append(move(line_text));
next_line_start_index = i + 1;
}
}
lines.append(text.substring(next_line_start_index, text.length() - next_line_start_index));
return lines;
}
Gfx::Color DiffViewer::red_background()
{
static Gfx::Color color = Gfx::Color::from_rgba(0x88ff0000);
return color;
}
Gfx::Color DiffViewer::green_background()
{
static Gfx::Color color = Gfx::Color::from_rgba(0x8800ff00);
return color;
}
Gfx::Color DiffViewer::gray_background()
{
static Gfx::Color color = Gfx::Color::from_rgba(0x88888888);
return color;
}
void DiffViewer::update_content_size()
{
if (m_hunks.is_empty()) {
set_content_size({ 0, 0 });
return;
}
size_t num_lines = 0;
size_t current_original_line_index = 0;
for (const auto& hunk : m_hunks) {
num_lines += ((int)hunk.original_start_line - (int)current_original_line_index);
num_lines += hunk.removed_lines.size();
if (hunk.added_lines.size() > hunk.removed_lines.size()) {
num_lines += ((int)hunk.added_lines.size() - (int)hunk.removed_lines.size());
}
current_original_line_index = hunk.original_start_line + hunk.removed_lines.size();
}
num_lines += ((int)m_original_lines.size() - (int)current_original_line_index);
// TODO: Support Horizontal scrolling
set_content_size({ 0, (int)(num_lines * line_height()) });
}
void DiffViewer::resize_event(GUI::ResizeEvent& event)
{
ScrollableWidget::resize_event(event);
update_content_size();
}
}
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