ansel-cli/main.c

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/*
    This file is part of darktable,
    Copyright (C) 2012, 2014-2015 johannes hanika.
    Copyright (C) 2012, 2014-2016, 2019-2021 Pascal Obry.
    Copyright (C) 2012-2017, 2019-2020 Tobias Ellinghaus.
    Copyright (C) 2013-2014 Jérémy Rosen.
    Copyright (C) 2013-2014 Pascal de Bruijn.
    Copyright (C) 2013 Thomas Pryds.
    Copyright (C) 2014 Pedro Côrte-Real.
    Copyright (C) 2014-2016 Roman Lebedev.
    Copyright (C) 2017, 2020 Heiko Bauke.
    Copyright (C) 2018 Bill Ferguson.
    Copyright (C) 2018 Michael Mayer.
    Copyright (C) 2019 Denis Dyakov.
    Copyright (C) 2019 parafin.
    Copyright (C) 2019 Philippe Weyland.
    Copyright (C) 2020 bobobo1618.
    Copyright (C) 2020 David-Tillmann Schaefer.
    Copyright (C) 2020 Hubert Kowalski.
    Copyright (C) 2021 Aldric Renaudin.
    Copyright (C) 2021 Christian Kreibich.
    Copyright (C) 2021 Hanno Schwalm.
    Copyright (C) 2021 Ralf Brown.
    Copyright (C) 2022-2023, 2025 Aurélien PIERRE.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2022 Miloš Komarčević.
    Copyright (C) 2023 Alynx Zhou.
    Copyright (C) 2026 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 "common/paths.h"   // DT_PATH_MAX
#include "common/xmp_sidecar.h"
#include "common/film.h"
#include "common/file_location.h"
#include "history/history.h"
#include "common/image.h"
#include "caches/image_cache.h"
#include "imageio/imageio_module.h"
#include "common/l10n.h"
 
#include <inttypes.h>
#include <libintl.h>
 
#ifdef __APPLE__
#include "osx/osx.h"
#endif
 
#ifdef _WIN32
#include "win/main_wrapper.h"
#endif
 
#define DT_MAX_STYLE_NAME_LENGTH 128
 
// Make sure it's OK to limit output extension length
#define DT_MAX_OUTPUT_EXT_LENGTH 5
 
static void usage(const char *progname)
{
  fprintf(stderr, "usage: %s [<input file or dir>] [<xmp file>] <output destination> [options] [--core <darktable options>]\n", progname);
  fprintf(stderr, "\n");
  fprintf(stderr, "options:\n");
  fprintf(stderr, "   --width <max width> default: 0 = full resolution\n");
  fprintf(stderr, "   --height <max height> default: 0 = full resolution\n");
  fprintf(stderr, "   --bpp <bpp>, unsupported\n");
  fprintf(stderr, "   --export_masks <0|1|false|true>, default: false\n");
  fprintf(stderr, "   --style <style name>\n");
  fprintf(stderr, "   --apply-custom-presets <0|1|false|true>, default: true\n");
  fprintf(stderr, "                          disable for multiple instances\n");
  fprintf(stderr, "   --out-ext <extension>, default from output destination or '.jpg'\n");
  fprintf(stderr, "                          if specified, takes preference over output\n");
  fprintf(stderr, "   --import <file or dir> specify input file or dir, can be used'\n");
  fprintf(stderr, "                          multiple times instead of input file\n");
  fprintf(stderr, "   --imgid <id>      process an image already in the library, using its\n");
  fprintf(stderr, "                     editing history from library.db (no input file, no XMP;\n");
  fprintf(stderr, "                     can be used multiple times; only the output is positional)\n");
  fprintf(stderr, "\n");
  fprintf(stderr, "   the output destination may contain $(VARIABLES) expanded by the disk\n");
  fprintf(stderr, "   storage, e.g. '/path/$(FILE_NAME)-myfix' with --out-ext tiff produces\n");
  fprintf(stderr, "   /path/<original basename>-myfix.tiff\n");
  fprintf(stderr, "   --icc-type <type> specify icc type, default to NONE\n");
  fprintf(stderr, "                     use --help icc-type for list of supported types\n");
  fprintf(stderr, "   --icc-file <file> specify icc filename, default to NONE\n");
  fprintf(stderr, "   --icc-intent <intent> specify icc intent, default to LAST\n");
  fprintf(stderr, "                     use --help icc-intent for list of supported intents\n");
  fprintf(stderr, "   --verbose\n");
  fprintf(stderr, "   --help,-h [option]\n");
  fprintf(stderr, "   --version\n");
}
 
static void icc_types()
{
  // TODO: Can this be automated to keep in sync with colorspaces.h?
  fprintf(stderr, "available ICC types:\n");
  fprintf(stderr, " NONE\n");
  fprintf(stderr, " FILE\n");
  fprintf(stderr, " SRGB\n");
  fprintf(stderr, " ADOBERGB\n");
  fprintf(stderr, " LIN_REC709\n");
  fprintf(stderr, " LIN_REC2020\n");
  fprintf(stderr, " XYZ\n");
  fprintf(stderr, " LAB\n");
  fprintf(stderr, " INFRARED\n");
  fprintf(stderr, " DISPLAY\n");
  fprintf(stderr, " EMBEDDED_ICC\n");
  fprintf(stderr, " EMBEDDED_MATRIX\n");
  fprintf(stderr, " STANDARD_MATRIX\n");
  fprintf(stderr, " ENHANCED_MATRIX\n");
  fprintf(stderr, " VENDOR_MATRIX\n");
  fprintf(stderr, " ALTERNATE_MATRIX\n");
  fprintf(stderr, " BRG\n");
  fprintf(stderr, " EXPORT\n"); // export and softproof are categories and will return NULL with dt_colorspaces_get_profile()
  fprintf(stderr, " SOFTPROOF\n");
  fprintf(stderr, " WORK\n");
  fprintf(stderr, " REC709\n");
  fprintf(stderr, " PROPHOTO_RGB\n");
  fprintf(stderr, " PQ_REC2020\n");
  fprintf(stderr, " HLG_REC2020\n");
  fprintf(stderr, " PQ_P3\n");
  fprintf(stderr, " HLG_P3\n");
  fprintf(stderr, " DISPLAY_P3\n");
}
 
#define ICC_FROM_STR(name) if(!strcmp(option, #name)) return DT_COLORSPACE_ ## name;
static dt_colorspaces_color_profile_type_t get_icc_type(const char* option)
{
  ICC_FROM_STR(NONE);
  ICC_FROM_STR(FILE);
  ICC_FROM_STR(SRGB);
  ICC_FROM_STR(ADOBERGB);
  ICC_FROM_STR(LIN_REC709);
  ICC_FROM_STR(LIN_REC2020);
  ICC_FROM_STR(XYZ);
  ICC_FROM_STR(LAB);
  ICC_FROM_STR(INFRARED);
  ICC_FROM_STR(DISPLAY);
  ICC_FROM_STR(EMBEDDED_ICC);
  ICC_FROM_STR(EMBEDDED_MATRIX);
  ICC_FROM_STR(STANDARD_MATRIX);
  ICC_FROM_STR(ENHANCED_MATRIX);
  ICC_FROM_STR(VENDOR_MATRIX);
  ICC_FROM_STR(ALTERNATE_MATRIX);
  ICC_FROM_STR(BRG);
  ICC_FROM_STR(EXPORT); // export and softproof are categories and will return NULL with dt_colorspaces_get_profile()
  ICC_FROM_STR(SOFTPROOF);
  ICC_FROM_STR(WORK);
  ICC_FROM_STR(REC709);
  ICC_FROM_STR(PROPHOTO_RGB);
  ICC_FROM_STR(PQ_REC2020);
  ICC_FROM_STR(HLG_REC2020);
  ICC_FROM_STR(PQ_P3);
  ICC_FROM_STR(HLG_P3);
  ICC_FROM_STR(DISPLAY_P3);
  return DT_COLORSPACE_LAST;
}
#undef ICC_FROM_STR
 
static void icc_intents()
{
  // TODO: Can this be automated to keep in sync with colorspaces.h?
  fprintf(stderr, "available ICC intents:\n");
  fprintf(stderr, " PERCEPTUAL\n");
  fprintf(stderr, " RELATIVE_COLORIMETRIC\n");
  fprintf(stderr, " SATURATION\n");
  fprintf(stderr, " ABSOLUTE_COLORIMETRIC\n");
}
#define ICC_INTENT_FROM_STR(name) if(!strcmp(option, #name)) return DT_INTENT_ ## name;
static dt_iop_color_intent_t get_icc_intent(const char* option)
{
  ICC_INTENT_FROM_STR(PERCEPTUAL);
  ICC_INTENT_FROM_STR(RELATIVE_COLORIMETRIC);
  ICC_INTENT_FROM_STR(SATURATION);
  ICC_INTENT_FROM_STR(ABSOLUTE_COLORIMETRIC);
  return DT_INTENT_LAST;
}
#undef ICC_INTENT_FROM_STR
 
int main(int argc, char *arg[])
{
#ifdef __APPLE__
  dt_osx_prepare_environment();
#endif
 
  // get valid locale dir
  char localedir[DT_PATH_MAX] = { 0 };
  dt_loc_resolve_localedir(localedir, sizeof(localedir));
  bindtextdomain(GETTEXT_PACKAGE, localedir);
 
  // gtk_parse_args may trigger GTK initialization, so disable GTK locale handling first.
  dt_l10n_disable_setlocale_early();
  if(!gtk_parse_args(&argc, &arg)) exit(1);
 
  // parse command line arguments
  char *input_filename = NULL;
  char *xmp_filename = NULL;
  gchar *output_filename = NULL;
  gchar *output_ext = NULL;
  char *style = NULL;
  int file_counter = 0;
  int width = 0, height = 0, bpp = 0;
  gboolean verbose = FALSE, custom_presets = TRUE, export_masks = FALSE,
           output_to_dir = FALSE;
 
  GList* inputs = NULL;
  GList* imgids = NULL;
 
  dt_colorspaces_color_profile_type_t icc_type = DT_COLORSPACE_NONE;
  gchar *icc_filename = NULL;
  dt_iop_color_intent_t icc_intent = DT_INTENT_LAST;
 
  int k;
  for(k = 1; k < argc; k++)
  {
    if(arg[k][0] == '-')
    {
      if(!strcmp(arg[k], "--help") || !strcmp(arg[k], "-h"))
      {
        usage(arg[0]);
        if(k+1 < argc) {
          if(!strcmp(arg[k+1], "icc-type"))
            icc_types();
          if(!strcmp(arg[k+1], "icc-intent"))
            icc_intents();
        }
        exit(1);
      }
      else if(!strcmp(arg[k], "--version"))
      {
        printf("this is ansel-cli %s\ncopyright (c) 2012-%s johannes hanika, tobias ellinghaus\n",
               darktable_package_version, darktable_last_commit_year);
        exit(0);
      }
      else if(!strcmp(arg[k], "--width") && argc > k + 1)
      {
        k++;
        width = MAX(atoi(arg[k]), 0);
      }
      else if(!strcmp(arg[k], "--height") && argc > k + 1)
      {
        k++;
        height = MAX(atoi(arg[k]), 0);
      }
      else if(!strcmp(arg[k], "--bpp") && argc > k + 1)
      {
        k++;
        bpp = MAX(atoi(arg[k]), 0);
        fprintf(stderr, _("TODO: sorry, due to API restrictions we currently cannot set the BPP to %d.\n"), bpp);
      }
      else if(!strcmp(arg[k], "--export_masks") && argc > k + 1)
      {
        k++;
        gchar *str = g_ascii_strup(arg[k], -1);
        if(!g_strcmp0(str, "0") || !g_strcmp0(str, "FALSE"))
          export_masks = FALSE;
        else if(!g_strcmp0(str, "1") || !g_strcmp0(str, "TRUE"))
          export_masks = TRUE;
        else
        {
          fprintf(stderr, _("unknown option for --export_masks: %s.\n"), arg[k]);
          usage(arg[0]);
          exit(1);
        }
        dt_free(str);
      }
      else if(!strcmp(arg[k], "--style") && argc > k + 1)
      {
        k++;
        style = arg[k];
      }
      else if(!strcmp(arg[k], "--apply-custom-presets") && argc > k + 1)
      {
        k++;
        gchar *str = g_ascii_strup(arg[k], -1);
        if(!g_strcmp0(str, "0") || !g_strcmp0(str, "FALSE"))
          custom_presets = FALSE;
        else if(!g_strcmp0(str, "1") || !g_strcmp0(str, "TRUE"))
          custom_presets = TRUE;
        else
        {
          fprintf(stderr, _("unknown option for --apply-custom-presets: %s.\n"), arg[k]);
          usage(arg[0]);
          exit(1);
        }
        dt_free(str);
      }
      else if(!strcmp(arg[k], "--out-ext") && argc > k + 1)
      {
        k++;
        if(strlen(arg[k])> DT_MAX_OUTPUT_EXT_LENGTH)
        {
          fprintf(stderr, _("too long ext for --out-ext: %s.\n"), arg[k]);
          usage(arg[0]);
          exit(1);
        }
        if (*arg[k] == '.')
        {
          //remove dot ;)
          arg[k]++;
        }
        output_ext = g_strdup(arg[k]);
      }
      else if(!strcmp(arg[k], "--import") && argc > k + 1)
      {
        k++;
        if(g_file_test(arg[k], G_FILE_TEST_EXISTS))
          inputs = g_list_prepend(inputs, g_strdup(arg[k]));
        else
          fprintf(stderr, _("notice: input file or dir '%s' doesn't exist, skipping\n"), arg[k]);
      }
      else if(!strcmp(arg[k], "--imgid") && argc > k + 1)
      {
        k++;
        const int imgid = atoi(arg[k]);
 
        if(imgid > 0)
          imgids = g_list_append(imgids, GINT_TO_POINTER(imgid));
        else
        {
          fprintf(stderr, _("incorrect image id for --imgid: '%s'\n"), arg[k]);
          usage(arg[0]);
          exit(1);
        }
      }
      else if(!strcmp(arg[k], "--icc-type") && argc > k + 1)
      {
        k++;
        gchar *str = g_ascii_strup(arg[k], -1);
        icc_type = get_icc_type(str);
        dt_free(str);
        if(icc_type >= DT_COLORSPACE_LAST){
          fprintf(stderr, _("incorrect ICC type for --icc-type: '%s'\n"), arg[k]);
          icc_types();
          usage(arg[0]);
          exit(1);
        }
      }
      else if(!strcmp(arg[k], "--icc-file") && argc > k + 1)
      {
        k++;
        if(g_file_test(arg[k], G_FILE_TEST_EXISTS) && ! g_file_test(arg[k], G_FILE_TEST_IS_DIR))
        {
          if(icc_filename)
            dt_free(icc_filename);
          icc_filename = g_strdup(arg[k]);
        }
        else
          fprintf(stderr, _("notice: ICC file '%s' doesn't exist, skipping\n"), arg[k]);
      }
      else if(!strcmp(arg[k], "--icc-intent") && argc > k + 1)
      {
        k++;
        gchar *str = g_ascii_strup(arg[k], -1);
        icc_intent = get_icc_intent(str);
        dt_free(str);
        if(icc_intent >= DT_INTENT_LAST){
          fprintf(stderr, _("incorrect ICC intent for --icc-intent: '%s'\n"), arg[k]);
          icc_intents();
          usage(arg[0]);
          exit(1);
        }
      }
      else if(!strcmp(arg[k], "-v") || !strcmp(arg[k], "--verbose"))
      {
        verbose = TRUE;
      }
      else if(!strcmp(arg[k], "--core"))
      {
        // everything from here on should be passed to the core
        k++;
        break;
      }
      else
      {
        fprintf(stderr, _("warning: unknown option '%s'\n"), arg[k]);
      }
    }
    else
    {
      if(file_counter == 0)
        input_filename = arg[k];
      else if(file_counter == 1)
        xmp_filename = arg[k];
      else if(file_counter == 2)
      {
        output_filename = g_strdup(arg[k]);
      }
      file_counter++;
    }
  }
 
  int m_argc = 0;
  char **m_arg = malloc(sizeof(char *) * (5 + argc - k + 1));
  m_arg[m_argc++] = "ansel-cli";
 
  // --imgid mode reads the image and its editing history from the user's library.db, so the
  // default library must be used. Every other mode keeps the throwaway in-memory library.
  if(IS_NULL_PTR(imgids))
  {
    m_arg[m_argc++] = "--library";
    m_arg[m_argc++] = ":memory:";
  }
 
  m_arg[m_argc++] = "--conf";
  m_arg[m_argc++] = "write_sidecar_files=FALSE";
  for(; k < argc; k++) m_arg[m_argc++] = arg[k];
  m_arg[m_argc] = NULL;
 
  if(imgids && (inputs || file_counter != 1))
  {
    // --imgid takes no input file and no XMP: the only positional argument is the output
    if(inputs || file_counter > 1)
      fprintf(stderr, _("error: --imgid cannot be combined with input files or an XMP (history comes from library.db)\n"));
    else
      fprintf(stderr, _("error: --imgid requires an output destination\n"));
 
    usage(arg[0]);
    dt_free(m_arg);
    if(output_filename)
    {
      dt_free(output_filename);
    }
    if(output_ext)
    {
      dt_free(output_ext);
    }
    g_list_free(imgids);
    if(inputs)
    {
      g_list_free_full(inputs, dt_free_gpointer);
      inputs = NULL;
    }
    exit(1);
  }
  else if(imgids)
  {
    // the single positional argument is the output destination
    if(output_filename)
      dt_free(output_filename);
    output_filename = g_strdup(input_filename);
    input_filename = xmp_filename = NULL;
  }
  else if( (inputs && file_counter < 1) || (IS_NULL_PTR(inputs) && file_counter < 2) || file_counter > 3)
  {
    usage(arg[0]);
    dt_free(m_arg);
    if(output_filename)
    {
      dt_free(output_filename);
    }
    if(output_ext)
    {
      dt_free(output_ext);
    }
    if(inputs)
    {
      g_list_free_full(inputs, dt_free_gpointer);
      inputs = NULL;
    }
    exit(1);
  }
  else if(inputs && file_counter == 1)
  {
    //user specified inputs as options, and only dest is present
    if(output_filename)
      dt_free(output_filename);
    output_filename = g_strdup(input_filename);
    input_filename = xmp_filename = NULL;
  }
  else if (inputs && file_counter == 2)
  {
    // inputs as options, xmp & output specified
    if(output_filename)
      dt_free(output_filename);
    output_filename = g_strdup(xmp_filename);
    xmp_filename = input_filename;
    input_filename = NULL;
  }
  else if (inputs && file_counter == 3)
  {
    fprintf(stderr, _("error: input file and import opts specified! that's not supported!\n"));
    usage(arg[0]);
    dt_free(m_arg);
    if(output_filename)
    {
      dt_free(output_filename);
    }
    if(output_ext)
    {
      dt_free(output_ext);
    }
    g_list_free_full(inputs, dt_free_gpointer);
    inputs = NULL;
    exit(1);
  }
  else if(file_counter == 2)
  {
    // assume no xmp file given
    if(output_filename)
      dt_free(output_filename);
    output_filename = g_strdup(xmp_filename);
    xmp_filename = NULL;
  }
 
  if(IS_NULL_PTR(inputs) && input_filename)
  {
    // input is present as param
    inputs = g_list_prepend(inputs, g_strdup(input_filename));
    input_filename = NULL;
  }
 
  if(g_file_test(output_filename, G_FILE_TEST_IS_DIR))
  {
    output_to_dir = TRUE;
    if(IS_NULL_PTR(output_ext))
    {
      output_ext = g_strdup("jpg");
    }
    fprintf(stderr, _("notice: output location is a directory. assuming '%s/$(FILE_NAME).%s' output pattern"), output_filename, output_ext);
    fprintf(stderr, "\n");
    gchar* temp_of = g_strdup(output_filename);
    dt_free(output_filename);
    if(g_str_has_suffix(temp_of, "/"))
      temp_of[strlen(temp_of) - 1] = '\0';
    output_filename = g_strconcat(temp_of, "/$(FILE_NAME)", NULL);
    dt_free(temp_of);
  }
 
  // the output file already exists, so there will be a sequence number added
  if(g_file_test(output_filename, G_FILE_TEST_EXISTS) && !output_to_dir)
  {
    if(IS_NULL_PTR(output_ext) || (output_ext && g_str_has_suffix(output_filename, output_ext) && !g_strcmp0(output_ext,strrchr(output_filename, '.')+1))){
      //output file exists or there's output ext specified and it's same as file...
      fprintf(stderr, "%s\n", _("output file already exists, it will get renamed"));
    }
    //TODO: test if file with replaced ext exists
    // or not if we decide we don't replace file ext with output ext specified
  }
 
  // init dt without gui and without data.db:
  if(dt_init(m_argc, m_arg, FALSE, custom_presets))
  {
    dt_free(m_arg);
    dt_free(output_filename);
    if(output_ext)
    {
      dt_free(output_ext);
    }
    if(inputs)
    {
      g_list_free_full(inputs, dt_free_gpointer);
      inputs = NULL;
    }
    exit(1);
  }
 
  GList *id_list = NULL;
 
  // --imgid mode: the images are already in the library with their history; just check they exist
  for(GList *l = imgids; !IS_NULL_PTR(l); l = g_list_next(l))
  {
    const int imgid = GPOINTER_TO_INT(l->data);
    const dt_image_t *image = dt_image_cache_get(imgid, 'r');
 
    if(image && image->id == imgid)
    {
      dt_image_cache_read_release(image);
      id_list = g_list_append(id_list, GINT_TO_POINTER(imgid));
    }
    else
    {
      if(image)
        dt_image_cache_read_release(image);
      fprintf(stderr, _("error: no image with id %d in the library"), imgid);
      fprintf(stderr, "\n");
    }
  }
 
  g_list_free(imgids);
  imgids = NULL;
 
  for(GList *l = inputs; !IS_NULL_PTR(l); l=g_list_next(l))
  {
    gchar* input = l->data;
 
    if(g_file_test(input, G_FILE_TEST_IS_DIR))
    {
      const int filmid = dt_film_import(input);
      if(!filmid)
      {
        // one of inputs was a failure, no prob
        fprintf(stderr, _("error: can't open folder %s"), input);
        fprintf(stderr, "\n");
        continue;
      }
      id_list = g_list_concat(id_list, dt_film_get_image_ids(filmid));
    }
    else
    {
      dt_film_t film;
      int filmid = 0;
 
      gchar *directory = g_path_get_dirname(input);
      filmid = dt_film_new(&film, directory);
      const int32_t id = dt_image_import(filmid, input, TRUE);
      dt_free(directory);
      if(!id)
      {
        fprintf(stderr, _("error: can't open file %s"), input);
        fprintf(stderr, "\n");
        continue;
      }
      id_list = g_list_append(id_list, GINT_TO_POINTER(id));
    }
  }
 
  //we no longer need inputs
  if(inputs)
  {
    g_list_free_full(inputs, dt_free_gpointer);
    inputs = NULL;
  }
 
  const int total = g_list_length(id_list);
 
  if(total == 0)
  {
    fprintf(stderr, _("no images to export, aborting\n"));
    dt_free(m_arg);
    dt_free(output_filename);
    if(output_ext)
    {
      dt_free(output_ext);
    }
    exit(1);
  }
 
  // attach xmp, if requested:
  if(xmp_filename)
  {
    for(GList *iter = id_list; iter; iter = g_list_next(iter))
    {
      int id = GPOINTER_TO_INT(iter->data);
      dt_image_t *image = dt_image_cache_get(id, 'w');
      if(dt_exif_xmp_read(image, xmp_filename, 1) != 0)
      {
        fprintf(stderr, _("error: can't open xmp file %s"), xmp_filename);
        fprintf(stderr, "\n");
        dt_free(m_arg);
        dt_free(output_filename);
        if(output_ext)
        {
          dt_free(output_ext);
        }
        exit(1);
      }
      // don't write new xmp:
      dt_image_cache_write_release(image, DT_IMAGE_CACHE_RELAXED);
    }
  }
 
  // print the history stack. only look at the first image and assume all got the same processing applied
  if(verbose)
  {
    int id = GPOINTER_TO_INT(id_list->data);
    gchar *history = dt_history_get_items_as_string(id);
    if(history)
      printf("%s\n", history);
    else
      printf("[%s]\n", _("empty history stack"));
  }
 
  if(IS_NULL_PTR(output_ext))
  {
    // by this point we're sure output is not dir, there's no output ext specified
    // so only place to look for it is in filename
    // try to find out the export format from the output_filename
    char *ext = strrchr(output_filename, '.');
    if(ext && strlen(ext) > DT_MAX_OUTPUT_EXT_LENGTH)
    {
      // too long ext, no point in wasting time
      fprintf(stderr, _("too long output file extension: %s\n"), ext);
      usage(arg[0]);
      dt_free(output_filename);
      exit(1);
    }
    else if(!ext || strlen(ext) <= 1)
    {
      // no ext or empty ext, no point in wasting time
      fprintf(stderr, _("no output file extension given\n"));
      usage(arg[0]);
      dt_free(output_filename);
      exit(1);
    }
    *ext = '\0';
    ext++;
    output_ext = g_strdup(ext);
  } else {
    // check and remove redundant file ext
    char *ext = strrchr(output_filename, '.');
    if(ext && !strcmp(output_ext, ext+1))
    {
      *ext = '\0';
    }
  }
 
  if(!strcmp(output_ext, "jpg"))
  {
    dt_free(output_ext);
    output_ext = g_strdup("jpeg");
  }
 
  if(!strcmp(output_ext, "tif"))
  {
    dt_free(output_ext);
    output_ext = g_strdup("tiff");
  }
 
  // init the export data structures
  dt_imageio_module_format_t *format;
  dt_imageio_module_storage_t *storage;
  dt_imageio_module_data_t *sdata, *fdata;
 
  storage = dt_imageio_get_storage_by_name("disk"); // only exporting to disk makes sense
  if(IS_NULL_PTR(storage))
  {
    fprintf(
        stderr, "%s\n",
        _("cannot find disk storage module. please check your installation, something seems to be broken."));
    dt_free(m_arg);
    dt_free(output_filename);
    dt_free(output_ext);
    exit(1);
  }
 
  sdata = storage->get_params(storage);
  if(IS_NULL_PTR(sdata))
  {
    fprintf(stderr, "%s\n", _("failed to get parameters from storage module, aborting export ..."));
    dt_free(m_arg);
    dt_free(output_filename);
    dt_free(output_ext);
    exit(1);
  }
 
  // and now for the really ugly hacks. don't tell your children about this one or they won't sleep at night
  // any longer ...
  g_strlcpy((char *)sdata, output_filename, DT_MAX_PATH_FOR_PARAMS);
  // all is good now, the last line didn't happen.
  dt_free(output_filename);
 
  format = dt_imageio_get_format_by_name(output_ext);
  if(IS_NULL_PTR(format))
  {
    fprintf(stderr, _("unknown extension '.%s'"), output_ext);
    fprintf(stderr, "\n");
    dt_free(m_arg);
    dt_free(output_ext);
    exit(1);
  }
 
  fdata = format->get_params(format);
  if(IS_NULL_PTR(fdata))
  {
    fprintf(stderr, "%s\n", _("failed to get parameters from format module, aborting export ..."));
    dt_free(m_arg);
    dt_free(output_ext);
    exit(1);
  }
 
  uint32_t w, h, fw, fh, sw, sh;
  fw = fh = sw = sh = 0;
  storage->dimension(storage, sdata, &sw, &sh);
  format->dimension(format, fdata, &fw, &fh);
 
  if(sw == 0 || fw == 0)
    w = sw > fw ? sw : fw;
  else
    w = sw < fw ? sw : fw;
 
  if(sh == 0 || fh == 0)
    h = sh > fh ? sh : fh;
  else
    h = sh < fh ? sh : fh;
 
  fdata->max_width = width;
  fdata->max_height = height;
  fdata->max_width = (w != 0 && fdata->max_width > w) ? w : fdata->max_width;
  fdata->max_height = (h != 0 && fdata->max_height > h) ? h : fdata->max_height;
  fdata->style[0] = '\0';
 
  if(style)
  {
    g_strlcpy((char *)fdata->style, style, DT_MAX_STYLE_NAME_LENGTH);
    fdata->style[127] = '\0';
  }
 
  if(storage->initialize_store)
  {
    storage->initialize_store(storage, sdata, &format, &fdata, &id_list, TRUE);
 
    format->set_params(format, fdata, format->params_size(format));
    storage->set_params(storage, sdata, storage->params_size(storage));
  }
 
  // TODO: add a callback to set the bpp without going through the config
 
  int num = 1, res = 0;
  for(GList *iter = id_list; iter; iter = g_list_next(iter), num++)
  {
    const int id = GPOINTER_TO_INT(iter->data);
    // TODO: have a parameter in command line to get the export presets
    dt_export_metadata_t metadata;
    metadata.flags = dt_lib_export_metadata_default_flags();
    metadata.list = NULL;
    // the size is the command line's: no scale factor, whatever the GUI's export module is set to
    if(storage->store(storage, sdata, id, format, fdata, 0.0, num, total, TRUE, export_masks,
                      icc_type, icc_filename, icc_intent, &metadata) != 0)
      res = 1;
  }
 
  // cleanup time
  if(storage->finalize_store) storage->finalize_store(storage, sdata);
  storage->free_params(storage, sdata);
  format->free_params(format, fdata);
  g_list_free(id_list);
  id_list = NULL;
  dt_free(output_ext);
 
  if(icc_filename)
  {
    dt_free(icc_filename);
  }
 
  dt_cleanup();
 
  dt_free(m_arg);
  exit(res);
}
 
// clang-format off
// modelines: These editor modelines have been set for all relevant files by tools/update_modelines.py
// vim: shiftwidth=2 expandtab tabstop=2 cindent
// kate: tab-indents: off; indent-width 2; replace-tabs on; indent-mode cstyle; remove-trailing-spaces modified;
// clang-format on