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#include <unistd.h>
#include <array>
#include <cstdio>
#include <fstream>
#include <future>
#include <iostream>
#include <iterator>
#include <memory>
#include <stdexcept>
#include <string>
#include <string_view>
#include <thread>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <imgui.h>
#include <imgui_impl_glfw.h>
#include <imgui_impl_opengl3.h>
#include <imgui_md.h>
std::string g_base_address;
ImFont * g_font_regular;
ImFont * g_font_bold;
ImFont * g_font_bold_large;
static std::string get(const std::string & command)
{
std::string result;
std::array<char, 512> buffer;
std::unique_ptr<FILE, decltype(&pclose)> opener(popen(command.c_str(), "r"), pclose);
if (!opener)
return std::string(); // TODO: time to do some error handling
while (nullptr != fgets(buffer.data(), buffer.size(), opener.get()))
{
result += buffer.data();
}
return result;
}
static std::string expand_url(const std::string & href)
{
std::string_view prefix(href.data(), 4);
if (prefix == "http")
return href;
else
{
prefix.remove_suffix(2);
if (prefix == "//")
return "https:" + href;
else
{
prefix.remove_suffix(1);
if (prefix == "/")
{
if (g_base_address.empty())
throw std::runtime_error("missing base address");
else
return g_base_address + href;
}
else
throw std::runtime_error("invalid href");
}
}
}
struct Markdown : public imgui_md
{
ImFont * get_font() const override
{
if (m_is_table_header)
{
return g_font_bold;
}
switch (m_hlevel)
{
case 0:
return m_is_strong ? g_font_bold : g_font_regular;
case 1:
return g_font_bold_large;
default:
return g_font_bold;
}
}
void open_url() const override
{
std::string command = "browse -f markdown " + expand_url(m_href);
std::packaged_task<std::string (const std::string &)> task(get);
std::thread t(std::move(task), command);
t.detach();
}
};
static void glfw_error_callback(int error, const char * description)
{
std::cerr << "glfw (" << error << "): " << description << std::endl;
}
static void markdown(const char * str, const char * str_end)
{
static Markdown s_printer;
s_printer.print(str, str_end);
}
ImVec2 g_window_size;
static void resized(GLFWwindow *, int width, int height)
{
g_window_size.x = static_cast<float>(width);
g_window_size.y = static_cast<float>(height);
}
static void print_usage(const char * program)
{
std::cerr << "Usage: " << program << " [-b BASE_ADDRESS] FILE" << std::endl;
}
int main(int argc, char ** argv)
{
int opt;
while (-1 != (opt = getopt(argc, argv, "b:")))
{
switch (opt)
{
case 'b':
g_base_address = optarg;
break;
case '?':
default:
print_usage(argv[0]);
return 2;
}
}
if (optind >= argc)
{
print_usage(argv[0]);
return 2;
}
glfwSetErrorCallback(glfw_error_callback);
if (!glfwInit())
return 1;
const char * glsl_version = "#version 130";
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
GLFWwindow * window = glfwCreateWindow(1280, 720, "Markdown", nullptr, nullptr);
if (nullptr == window)
return 1;
glfwMakeContextCurrent(window);
glfwSwapInterval(1);
glfwSetWindowSizeCallback(window, resized);
if (GLEW_OK != glewInit())
return 1;
IMGUI_CHECKVERSION();
ImGui::CreateContext();
ImGuiIO & io = ImGui::GetIO();
io.IniFilename = nullptr;
io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
g_font_regular = io.Fonts->AddFontFromFileTTF("OpenSans-Regular.ttf", 18);
g_font_bold = io.Fonts->AddFontFromFileTTF("OpenSans-Bold.ttf", 18);
g_font_bold_large = io.Fonts->AddFontFromFileTTF("OpenSans-Bold.ttf", 26);
ImGui::StyleColorsDark();
ImGui_ImplGlfw_InitForOpenGL(window, true);
ImGui_ImplOpenGL3_Init(glsl_version);
std::ifstream in;
in.open(argv[optind]);
std::string text(std::istreambuf_iterator<char>(in), {});
in.close();
while (!glfwWindowShouldClose(window))
{
glfwPollEvents();
ImGui_ImplOpenGL3_NewFrame();
ImGui_ImplGlfw_NewFrame();
ImGui::NewFrame();
ImGui::SetNextWindowPos({0, 0});
ImGui::SetNextWindowSize(g_window_size);
ImGui::Begin(
"Markdown",
nullptr,
ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove |
ImGuiWindowFlags_NoBackground | ImGuiWindowFlags_NoSavedSettings
);
markdown(text.data(), text.data() + text.size());
ImGui::End();
ImGui::Render();
int display_w, display_h;
glfwGetFramebufferSize(window, &display_w, &display_h);
glViewport(0, 0, display_w, display_h);
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT);
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
glfwSwapBuffers(window);
}
ImGui_ImplOpenGL3_Shutdown();
ImGui_ImplGlfw_Shutdown();
ImGui::DestroyContext();
glfwDestroyWindow(window);
glfwTerminate();
}
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