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#include "ui/source_view.h"
#include "core/log.h"
#include "debugger/debugger.h"
#include <imgui.h>
#include <imgui_internal.h>
#include <misc/cpp/imgui_stdlib.h>
#include <algorithm>
#include <fstream>
namespace Hsdbg
{
namespace
{
constexpr float BREAKPOINT_RADIUS = 5.0f;
// the dot sits in the gutter with this much room on either side, and the
// line numbers pick the same gap up again so the column reads evenly
constexpr float GUTTER_MARGIN = 6.0f;
constexpr float GUTTER_WIDTH = BREAKPOINT_RADIUS * 2.0f + GUTTER_MARGIN * 2.0f;
const ImU32 BREAKPOINT_COLOR = IM_COL32(226, 84, 84, 255);
const ImU32 BREAKPOINT_DISABLED_COLOR = IM_COL32(120, 90, 90, 255);
const ImU32 BREAKPOINT_HOVER_COLOR = IM_COL32(226, 84, 84, 90);
const ImU32 HIGHLIGHT_COLOR = IM_COL32(58, 72, 46, 255);
auto line_number_width(size_t line_count) -> float
{
return ImGui::CalcTextSize(std::to_string(line_count).c_str()).x;
}
}
auto SourceView::open(const std::filesystem::path& path) -> Result<void>
{
std::ifstream file(path);
if (!file.is_open())
return fail("could not open '{}'", path.string());
std::vector<std::string> lines;
std::string line;
while (std::getline(file, line))
{
if (!line.empty() && line.back() == '\r')
line.pop_back();
lines.push_back(std::move(line));
}
m_path = path;
m_lines = std::move(lines);
m_path_input = path.string();
m_error.clear();
m_highlighted_line = 0;
Log::info("source: opened '{}' ({} lines)", m_path.string(), m_lines.size());
return {};
}
auto SourceView::close() -> void
{
m_path.clear();
m_lines.clear();
m_error.clear();
m_highlighted_line = 0;
}
auto SourceView::set_highlighted_line(uint32_t line) -> void
{
m_highlighted_line = line;
m_scroll_to_highlight = line != 0;
}
auto SourceView::draw(Debugger& debugger) -> void
{
draw_open_bar();
ImGui::Separator();
if (m_lines.empty())
{
ImGui::TextDisabled("no source file open");
return;
}
draw_lines(debugger);
}
auto SourceView::draw_open_bar() -> void
{
ImGui::SetNextItemWidth(-ImGui::CalcTextSize("open").x - ImGui::GetStyle().FramePadding.x * 4.0f);
const bool submitted = ImGui::InputTextWithHint("##source_path",
"path to a source file",
&m_path_input,
ImGuiInputTextFlags_EnterReturnsTrue);
ImGui::SameLine();
if (ImGui::Button("open") || submitted)
{
if (const auto result = open(m_path_input); !result)
{
m_error = result.error();
Log::error("{}", m_error);
}
}
if (!m_error.empty())
ImGui::TextColored(ImVec4(0.89f, 0.33f, 0.33f, 1.0f), "%s", m_error.c_str());
}
auto SourceView::draw_lines(Debugger& debugger) -> void
{
const float text_height = ImGui::GetTextLineHeightWithSpacing();
const float number_width = line_number_width(m_lines.size());
ImDrawList* draw_list = ImGui::GetWindowDrawList();
if (!ImGui::BeginChild("##source_lines", ImVec2(0.0f, 0.0f), ImGuiChildFlags_Borders))
{
ImGui::EndChild();
return;
}
if (m_scroll_to_highlight && m_highlighted_line != 0)
{
ImGui::SetScrollY(static_cast<float>(m_highlighted_line - 1) * text_height -
ImGui::GetWindowHeight() * 0.4f);
m_scroll_to_highlight = false;
}
ImGuiListClipper clipper;
clipper.Begin(static_cast<int>(m_lines.size()), text_height);
while (clipper.Step())
{
for (int index = clipper.DisplayStart; index < clipper.DisplayEnd; ++index)
{
const uint32_t line_number = static_cast<uint32_t>(index) + 1;
const ImVec2 row_start = ImGui::GetCursorScreenPos();
if (line_number == m_highlighted_line)
{
draw_list->AddRectFilled(row_start,
ImVec2(row_start.x + ImGui::GetContentRegionAvail().x,
row_start.y + text_height),
HIGHLIGHT_COLOR);
}
ImGui::PushID(index);
if (ImGui::InvisibleButton("##gutter", ImVec2(GUTTER_WIDTH, text_height)))
{
const Breakpoint* existing = nullptr;
for (const Breakpoint& breakpoint : debugger.breakpoints())
{
if (breakpoint.file == m_path && breakpoint.line == line_number)
{
existing = &breakpoint;
break;
}
}
if (existing != nullptr)
debugger.remove_breakpoint(existing->id);
else
debugger.add_breakpoint(m_path, line_number);
}
const bool gutter_hovered = ImGui::IsItemHovered();
ImGui::PopID();
const Breakpoint* breakpoint = nullptr;
for (const Breakpoint& candidate : debugger.breakpoints())
{
if (candidate.file == m_path && candidate.line == line_number)
{
breakpoint = &candidate;
break;
}
}
const ImVec2 marker_center(row_start.x + GUTTER_WIDTH * 0.5f,
row_start.y + text_height * 0.5f);
if (breakpoint != nullptr)
{
draw_list->AddCircleFilled(marker_center,
BREAKPOINT_RADIUS,
breakpoint->enabled ? BREAKPOINT_COLOR
: BREAKPOINT_DISABLED_COLOR);
}
else if (gutter_hovered)
{
draw_list->AddCircleFilled(marker_center, BREAKPOINT_RADIUS, BREAKPOINT_HOVER_COLOR);
}
const std::string number_text = std::to_string(line_number);
ImGui::SameLine(0.0f, 0.0f);
ImGui::SetCursorPosX(ImGui::GetCursorPosX() + number_width -
ImGui::CalcTextSize(number_text.c_str()).x);
ImGui::TextDisabled("%s", number_text.c_str());
ImGui::SameLine(0.0f, GUTTER_MARGIN * 2.0f);
ImGui::TextUnformatted(m_lines[static_cast<size_t>(index)].c_str());
}
}
clipper.End();
ImGui::EndChild();
}
}
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