rntviewer/src/rntviewer.cpp

// ************************************
// *
// * rntviewer
// *
// * A graphical RNTuple visualizer 
// *
// * @author silverweed, 2024
// *
// ***********************************
#include <cstdio>
#include <cstdint>
#include <cmath>
#include <cstring>
#include <cassert>

#include <byteswap.h>
#include <chrono>

#ifdef DEBUG
#include <sanitizer/asan_interface.h>
#endif

#ifndef RNT_NO_GFX
#include <imgui/imgui.h>
#include <imgui/backends/imgui_impl_glfw.h>
#include <imgui/backends/imgui_impl_opengl3.h>
#include <imgui_club/imgui_memory_editor.h>

#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>
#endif

#define V_MAJOR "0"
#define V_MINOR "1"

#include "root/root_inc.h"
#include "root/RMicroFileReader.hxx"

#include "types.h"
#include "defer.hpp"
#include "prof.hpp"
#include "mem.h"
#include "str.h"
#include "rntuple.h"
#include "window.h"
#include "render.h"
#include "app_state.h"

// @Platform
#include "platform_linux.h"

namespace chr = std::chrono;

#include "mem.cpp"
#include "str.cpp"
#include "rntuple.cpp"
#include "render_term.cpp"
#include "argparse.cpp"

#ifndef RNT_NO_GFX
#include "render.cpp"
#include "mainloop.cpp"
#endif

internal
void app_cleanup(App_State &app)
{
  os_stop_file_watch(app);
  os_unmap_file(app.inspected_file.mem, app.inspected_file.size);
  if (app.inspected_file.stream) fclose(app.inspected_file.stream); 
}

int main(int argc, char **argv)
{
  // Prepare thread context
  Thread_Ctx tctx;
  tctx_init(tctx);
  defer { tctx_release(); };
  
  // Allocate program memory
  Arena *arena = arena_alloc();
  if (!arena) {
    fprintf(stderr, "Failed to allocate memory\n");
    return 1;
  }
  defer { arena_release(arena); };

  // Parse cmdline
  Cmdline_Args args = parse_args(argc, argv);
  if (args.show_help_and_exit || !args.ntpl_name.size || !args.file_name.size) {
    print_help(argv[0]);
    return 1;
  }

#ifdef RNT_NO_GFX
  if (!args.print_to_terminal) {
    fprintf(stderr, "rntviewer was compiled without graphics support. Please use -t to enable terminal mode.");
    return 0;
  }
#endif

  // Create app state
  App_State app {};
  defer { app_cleanup(app); };

  // Open and map the file
  if (args.file_name.size) {
    if (!os_open_and_map_file(args.file_name, app))
      return 1;
    
    // Watch file for changes (to adapt the displayed file size - otherwise
    // we may try to access invalid memory when the file gets shrunk)
    if (!args.print_to_terminal)
      os_start_file_watch(args.file_name, app);
  }

  app.ntpl_name = args.ntpl_name;
  app.base_display_addr = args.start_addr;
  app.tfile_data = get_tfile_data(app.inspected_file);
  app.rndata = get_rntuple_data(arena, app.inspected_file, app.ntpl_name);

  if (args.print_to_terminal) {
    u64 nbytes_displayed = args.nbytes_displayed;
    if (!nbytes_displayed)
      nbytes_displayed = 1000;
    String8 rendered = render_range_to_string(arena, app, nbytes_displayed, args.n_cols);
    printf("%s\n", rendered.c());
    return 0;
  }
  
#ifndef RNT_NO_GFX
  // Init imgui and GLFW
  GLFWwindow *window = init_glfw(800, 600);
  if (!window) {
    fprintf(stderr, "Failed to init GLFW\n");
    return 1;
  }
  defer { glfwTerminate(); };
  
  if (!init_imgui(window)) {
    fprintf(stderr, "Failed to init Imgui\n");
    return 1;
  }

  make_viewer(app, args.n_cols);

  // Start main loop
  run_main_loop(window, arena, app);
#endif

  return 0;
}