ansel/main.c

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/*
    This file is part of darktable,
    Copyright (C) 2009-2011 johannes hanika.
    Copyright (C) 2012 Richard Wonka.
    Copyright (C) 2014 Jérémy Rosen.
    Copyright (C) 2014, 2016-2018 Tobias Ellinghaus.
    Copyright (C) 2018 Peter Budai.
    Copyright (C) 2019 Michael Baumgaertner.
    Copyright (C) 2019 parafin.
    Copyright (C) 2019-2020 Pascal Obry.
    Copyright (C) 2022 Aurélien PIERRE.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2022 Philippe Weyland.
    Copyright (C) 2025 Guillaume Stutin.
    
    darktable is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    
    darktable is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    
    You should have received a copy of the GNU General Public License
    along with darktable.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "darktable.h"
#include "gui/application.h"
#include <stdlib.h>
 
#ifdef __APPLE__
#include "osx/osx.h"
#endif
 
#ifdef _WIN32
#include "win/main_wrapper.h"
#include "common/datetime.h"
#endif
 
int main(int argc, char *argv[])
{
#ifdef __APPLE__
  dt_osx_prepare_environment();
#endif
#ifdef _WIN32
  // Opening any native shell dialog (GtkFileChooserNative -> IFileDialog) loads every
  // installed shell extension into our process; extensions shipping Intel's OpenMP
  // runtime (libiomp5md.dll) then collide with our libomp and the Intel runtime aborts
  // the app with OMP error #15. We never run their OpenMP code and they never run ours,
  // so the duplicate-runtime detection is a false positive here: silence it, as the
  // runtime's own message advises.
  g_setenv("KMP_DUPLICATE_LIB_OK", "TRUE", TRUE);
 
  // ansel.exe is linked as a GUI-subsystem binary, so it has no console of its own and
  // anything printed to stdout/stderr would go nowhere. We write it to a log file
  // instead -- unless the caller already arranged somewhere for it to go.
  char datetime[DT_DATETIME_EXIF_LENGTH];
  dt_datetime_now_to_exif(datetime);
 
  // make sure to not redirect output when the output is already being redirected, either to a file or a pipe.
  int out_type = GetFileType(GetStdHandle(STD_OUTPUT_HANDLE));
  int err_type = GetFileType(GetStdHandle(STD_ERROR_HANDLE));
  gboolean redirect_output = ((out_type != FILE_TYPE_DISK && out_type != FILE_TYPE_PIPE) &&
                              (err_type != FILE_TYPE_DISK && err_type != FILE_TYPE_PIPE));
 
  for(int k = 1; k < argc; k++)
  {
    // For simple arguments do not redirect stdout
    if(!strcmp(argv[k], "--help") || !strcmp(argv[k], "-h") || !strcmp(argv[k], "/?") || !strcmp(argv[k], "--version")
    || !strcmp(argv[k], "-d") || !strcmp(argv[k], "--debug"))
    {
      redirect_output = FALSE;
      break;
    }
  }
 
  if(redirect_output)
  {
    // something like C:\Users\username\AppData\Local\Microsoft\Windows\Temporary Internet Files\ansel\ansel-log.txt
    char *logdir = g_build_filename(g_get_user_cache_dir(), "ansel", NULL);
    char *logfile = g_build_filename(logdir, "ansel-log.txt", NULL);
 
    g_mkdir_with_parents(logdir, 0700);
 
    /* If this fails, freopen() has already closed stdout and fileno() answers -1; handing
     * that to dup2() reaches the CRT's invalid-parameter handler, which ends the process
     * before the first window is ever drawn. A log file we could not open is not worth
     * dying for, so stop redirecting and carry on. */
    redirect_output = (g_freopen(logfile, "a", stdout) != NULL);
 
    if(redirect_output)
    {
      dup2(fileno(stdout), fileno(stderr));
 
      // don't buffer stdout/stderr. we have basically two options: unbuffered or line buffered.
      // unbuffered keeps the order in which things are printed but concurrent threads printing can lead to intermangled output. ugly.
      // line buffered should keep lines together but in my tests the order of things no longer matches. ugly and potentially confusing.
      // thus we are doing the thing that is just ugly (in rare cases) but at least not confusing.
      setvbuf(stdout, NULL, _IONBF, 0);
      setvbuf(stderr, NULL, _IONBF, 0);
 
      printf("========================================\n");
      printf("version: %s\n", darktable_package_string);
      printf("start: %s\n", datetime);
      printf("\n");
    }
 
    dt_free(logdir);
    dt_free(logfile);
  }
 
  // make sure GTK client side decoration is disabled, otherwise windows resizing issues can be observed
  g_setenv("GTK_CSD", "0", TRUE);
#endif
 
  if(dt_init(argc, argv, TRUE, TRUE)) exit(1);
  dt_gui_gtk_run(dt_gui_get_global());
 
#ifdef _WIN32
  if(redirect_output)
  {
    printf("\n");
    printf("end:   %s\n", datetime);
    printf("========================================\n");
    printf("\n");
  }
#endif
 
  exit(0);
}
 
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