common/conf.c

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/*
    This file is part of darktable,
    Copyright (C) 2010-2011, 2014 Henrik Andersson.
    Copyright (C) 2010-2013 johannes hanika.
    Copyright (C) 2010, 2012-2017 Tobias Ellinghaus.
    Copyright (C) 2012 Christian Tellefsen.
    Copyright (C) 2012 Jérémy Rosen.
    Copyright (C) 2012 Richard Wonka.
    Copyright (C) 2012 Simon Spannagel.
    Copyright (C) 2012, 2014 Ulrich Pegelow.
    Copyright (C) 2013 Jean-Sébastien Pédron.
    Copyright (C) 2013 Jesper Pedersen.
    Copyright (C) 2014 parafin.
    Copyright (C) 2014, 2020-2021 Pascal Obry.
    Copyright (C) 2014, 2016 Roman Lebedev.
    Copyright (C) 2016-2018 Peter Budai.
    Copyright (C) 2019 jakubfi.
    Copyright (C) 2019, 2021 luzpaz.
    Copyright (C) 2020 Hubert Kowalski.
    Copyright (C) 2020 Philippe Weyland.
    Copyright (C) 2021 Aldric Renaudin.
    Copyright (C) 2021 Marco Carrarini.
    Copyright (C) 2021 Mark-64.
    Copyright (C) 2021 Ralf Brown.
    Copyright (C) 2022 Hanno Schwalm.
    Copyright (C) 2022 Martin Bařinka.
    Copyright (C) 2025 Aurélien PIERRE.
    
    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/>.
*/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "math/calculator.h"
#include "darktable.h"
#include "common/file_location.h"
#include "math/math.h"
#include "common/conf.h"
 
#include <glib.h>
#include <glib/gstdio.h>
#include <glib/gprintf.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include "common/utility.h"
 
typedef struct dt_conf_dreggn_t
{
  GSList *result;
  const char *match;
} dt_conf_dreggn_t;
 
static void _free_confgen_value(void *value)
{
  dt_confgen_value_t *s = (dt_confgen_value_t *)value;
  dt_free(s->def);
  dt_free(s->min);
  dt_free(s->max);
  dt_free(s->enum_values);
  dt_free(s->shortdesc);
  dt_free(s->longdesc);
  dt_free(s);
}
 
static inline char *_dt_conf_get_var_locked(const char *name)
{
  char *str;
 
  str = (char *)g_hash_table_lookup(darktable.conf->override_entries, name);
  if(!IS_NULL_PTR(str)) return str;
 
  str = (char *)g_hash_table_lookup(darktable.conf->table, name);
  if(!IS_NULL_PTR(str)) return str;
 
  // not found, try defaults
  str = (char *)dt_confgen_get(name, DT_DEFAULT);
  if(!IS_NULL_PTR(str))
  {
    char *str_new = g_strdup(str);
    g_hash_table_insert(darktable.conf->table, g_strdup(name), str_new);
    return str_new;
  }
 
  // FIXME: why insert garbage?
  // still no luck? insert garbage:
  str = (char *)g_malloc0(sizeof(int32_t));
  g_hash_table_insert(darktable.conf->table, g_strdup(name), str);
  return str;
}
 
static inline char *dt_conf_get_var(const char *name)
{
  dt_pthread_mutex_lock(&darktable.conf->mutex);
  char *str = _dt_conf_get_var_locked(name);
  dt_pthread_mutex_unlock(&darktable.conf->mutex);
  return str;
}
 
/* set the value only if it hasn't been overridden from commandline
 * return 1 if key/value is still the one passed on commandline. */
static int dt_conf_set_if_not_overridden(const char *name, char *str)
{
  dt_pthread_mutex_lock(&darktable.conf->mutex);
 
  char *over = (char *)g_hash_table_lookup(darktable.conf->override_entries, name);
  const int is_overridden = (over && !strcmp(str, over));
  if(!is_overridden)
  {
    g_hash_table_insert(darktable.conf->table, g_strdup(name), str);
  }
 
  dt_pthread_mutex_unlock(&darktable.conf->mutex);
 
  return is_overridden;
}
 
void dt_conf_set_int(const char *name, int val)
{
  char *str = g_strdup_printf("%d", val);
  if(dt_conf_set_if_not_overridden(name, str))
  {
    dt_free(str);
  }
}
 
void dt_conf_set_int64(const char *name, int64_t val)
{
  char *str = g_strdup_printf("%" PRId64, val);
  if(dt_conf_set_if_not_overridden(name, str))
  {
    dt_free(str);
  }
}
 
void dt_conf_set_float(const char *name, float val)
{
  char *str = (char *)g_malloc(G_ASCII_DTOSTR_BUF_SIZE);
  g_ascii_dtostr(str, G_ASCII_DTOSTR_BUF_SIZE, val);
  if(dt_conf_set_if_not_overridden(name, str))
  {
    dt_free(str);
  }
}
 
void dt_conf_set_bool(const char *name, int val)
{
  char *str = g_strdup(val ? "TRUE" : "FALSE");
  if(dt_conf_set_if_not_overridden(name, str))
  {
    dt_free(str);
  }
}
 
void dt_conf_set_string(const char *name, const char *val)
{
  char *str = g_strdup(val);
  if(dt_conf_set_if_not_overridden(name, str))
  {
    dt_free(str);
  }
}
 
void dt_conf_set_folder_from_file_chooser(const char *name, GtkFileChooser *chooser)
{
 
#ifdef WIN32
  // for Windows native file chooser, gtk_file_chooser_get_current_folder()
  // does not work, so we workaround
  if(GTK_IS_FILE_CHOOSER_NATIVE(chooser))
  {
    gchar *pathname = gtk_file_chooser_get_filename(chooser);
    if(pathname)
    {
      gchar *folder = g_path_get_dirname(pathname);
      if(dt_conf_set_if_not_overridden(name, folder))
      {
        dt_free(folder);
      }
      dt_free(pathname);
    }
    return;
  }
#endif
 
  gchar *folder = gtk_file_chooser_get_current_folder(chooser);
  if(dt_conf_set_if_not_overridden(name, folder))
  {
    dt_free(folder);
  }
}
 
int dt_conf_get_int_fast(const char *name)
{
  const char *str = dt_conf_get_var(name);
  float new_value = dt_calculator_solve(1, str);
  if(isnan(new_value))
  {
    //we've got garbage, check default
    const char *def_val = dt_confgen_get(name, DT_DEFAULT);
    if(!IS_NULL_PTR(def_val))
    {
      new_value = dt_calculator_solve(1, def_val);
      if(isnan(new_value))
        new_value = 0.0;
      else
      {
        char *fix_badval = g_strdup(def_val);
        if(dt_conf_set_if_not_overridden(name, fix_badval))
        {
          dt_free(fix_badval);
        }
      }
    }
    else
    {
      new_value = 0.0;
    }
  }
 
  int val;
  if(new_value > 0)
    val = new_value + 0.5;
  else
    val = new_value - 0.5;
  return val;
}
 
int dt_conf_get_int(const char *name)
{
  const int min = dt_confgen_get_int(name, DT_MIN);
  const int max = dt_confgen_get_int(name, DT_MAX);
  const int val = dt_conf_get_int_fast(name);
  const int ret = CLAMP(val, min, max);
  return ret;
}
 
int64_t dt_conf_get_int64_fast(const char *name)
{
  const char *str = dt_conf_get_var(name);
  float new_value = dt_calculator_solve(1, str);
  if(isnan(new_value))
  {
    //we've got garbage, check default
    const char *def_val = dt_confgen_get(name, DT_DEFAULT);
    if(!IS_NULL_PTR(def_val))
    {
      new_value = dt_calculator_solve(1, def_val);
      if(isnan(new_value))
        new_value = 0.0;
      else
      {
        char *fix_badval = g_strdup(def_val);
        if(dt_conf_set_if_not_overridden(name, fix_badval))
        {
          dt_free(fix_badval);
        }
      }
    }
    else
    {
      new_value = 0.0;
    }
  }
 
  int64_t val;
  if(new_value > 0)
    val = new_value + 0.5;
  else
    val = new_value - 0.5;
  return val;
}
 
int64_t dt_conf_get_int64(const char *name)
{
  const int64_t min = dt_confgen_get_int64(name, DT_MIN);
  const int64_t max = dt_confgen_get_int64(name, DT_MAX);
  const int64_t val = dt_conf_get_int64_fast(name);
  const int64_t ret = CLAMP(val, min, max);
  return ret;
}
 
float dt_conf_get_float_fast(const char *name)
{
  const char *str = dt_conf_get_var(name);
  float new_value = dt_calculator_solve(1, str);
  if(isnan(new_value))
  {
    //we've got garbage, check default
    const char *def_val = dt_confgen_get(name, DT_DEFAULT);
    if(!IS_NULL_PTR(def_val))
    {
      new_value = dt_calculator_solve(1, def_val);
      if(isnan(new_value))
        new_value = 0.0;
      else
      {
        char *fix_badval = g_strdup(def_val);
        if(dt_conf_set_if_not_overridden(name, fix_badval))
        {
          dt_free(fix_badval);
        }
      }
    }
    else
    {
      new_value = 0.0;
    }
  }
  return new_value;
}
 
float dt_conf_get_float(const char *name)
{
  const float min = dt_confgen_get_float(name, DT_MIN);
  const float max = dt_confgen_get_float(name, DT_MAX);
  const float val = dt_conf_get_float_fast(name);
  const float ret = CLAMP(val, min, max);
  return ret;
}
 
int dt_conf_get_and_sanitize_int(const char *name, int min, int max)
{
  const int cmin = dt_confgen_get_int(name, DT_MIN);
  const int cmax = dt_confgen_get_int(name, DT_MAX);
  const int val = dt_conf_get_int_fast(name);
  const int ret = CLAMPS(val, MAX(min, cmin), MIN(max, cmax));
  dt_conf_set_int(name, ret);
  return ret;
}
 
int64_t dt_conf_get_and_sanitize_int64(const char *name, int64_t min, int64_t max)
{
  const int64_t cmin = dt_confgen_get_int64(name, DT_MIN);
  const int64_t cmax = dt_confgen_get_int64(name, DT_MAX);
  const int64_t val = dt_conf_get_int64_fast(name);
  const int64_t ret = CLAMPS(val, MAX(min, cmin), MIN(max, cmax));
  dt_conf_set_int64(name, ret);
  return ret;
}
 
float dt_conf_get_and_sanitize_float(const char *name, float min, float max)
{
  const float cmin = dt_confgen_get_float(name, DT_MIN);
  const float cmax = dt_confgen_get_float(name, DT_MAX);
  const float val = dt_conf_get_float_fast(name);
  const float ret = CLAMPS(val, MAX(min, cmin), MIN(max, cmax));
  dt_conf_set_float(name, ret);
  return ret;
}
 
int dt_conf_get_bool(const char *name)
{
  const char *str = dt_conf_get_var(name);
  const int val = (str[0] == 'T') || (str[0] == 't');
  return val;
}
 
gchar *dt_conf_get_string(const char *name)
{
  // Copy the value before releasing the lock: dt_conf_get_var() hands back a pointer straight
  // into the conf hash table, and a concurrent dt_conf_set_*() on the same key can free it
  // (g_hash_table_insert() destroys the value it replaces) the moment the lock is released --
  // a caller strdup'ing that pointer afterwards races the free. This was the mechanism behind a
  // "write_sidecar_files silently flips to FALSE" report: dt_image_get_xmp_mode() reads this key
  // from many threads per image, and a torn read masqueraded as an unrecognized/disabled value.
  dt_pthread_mutex_lock(&darktable.conf->mutex);
  const char *str = _dt_conf_get_var_locked(name);
  gchar *result = g_strdup(str);
  dt_pthread_mutex_unlock(&darktable.conf->mutex);
  return result;
}
 
const char *dt_conf_get_string_const(const char *name)
{
  return dt_conf_get_var(name);
}
 
gboolean dt_conf_key_not_empty(const char *name)
{
  const char *val = dt_conf_get_string_const(name);
  if(IS_NULL_PTR(val))      return FALSE;
  if(strlen(val) == 0) return FALSE;
  return TRUE;
}
 
gboolean dt_conf_get_folder_to_file_chooser(const char *name, GtkFileChooser *chooser)
{
  const gchar *folder = dt_conf_get_string_const(name);
  if (!IS_NULL_PTR(folder))
  {
    gtk_file_chooser_set_current_folder(chooser, folder);
    return TRUE;
  }
  return FALSE;
}
 
gboolean dt_conf_is_equal(const char *name, const char *value)
{
  const char *str = dt_conf_get_var(name);
  return g_strcmp0(str, value) == 0;
}
 
static char *_sanitize_confgen(const char *name, const char *value)
{
  const dt_confgen_value_t *item = g_hash_table_lookup(darktable.conf->x_confgen, name);
 
  if(IS_NULL_PTR(item)) return g_strdup(value);
 
  char *result = NULL;
 
  switch(item->type)
  {
    case DT_INT:
    {
      float v = dt_calculator_solve(1, value);
 
      const int min = item->min ? (int)dt_calculator_solve(1, item->min) : INT_MIN;
      const int max = item->max ? (int)dt_calculator_solve(1, item->max) : INT_MAX;
      // if garbage, use default
      const int val = isnan(v) ? dt_confgen_get_int(name, DT_DEFAULT) : (int)v;
      result = g_strdup_printf("%d", CLAMP(val, min, max));
    }
    break;
    case DT_INT64:
    {
      float v = dt_calculator_solve(1, value);
 
      const int64_t min = item->min ? (int64_t)dt_calculator_solve(1, item->min) : INT64_MIN;
      const int64_t max = item->max ? (int64_t)dt_calculator_solve(1, item->max) : INT64_MAX;
      // if garbage, use default
      const int64_t val = isnan(v) ? dt_confgen_get_int64(name, DT_DEFAULT) : (int64_t)v;
      result = g_strdup_printf("%"PRId64, CLAMP(val, min, max));
    }
    break;
    case DT_FLOAT:
    {
      float v = dt_calculator_solve(1, value);
 
      const float min = item->min ? (float)dt_calculator_solve(1, item->min) : -FLT_MAX;
      const float max = item->max ? (float)dt_calculator_solve(1, item->max) : FLT_MAX;
      // if garbage, use default
      const float val = isnan(v) ? dt_confgen_get_float(name, DT_DEFAULT) : v;
      result = g_strdup_printf("%f", CLAMP(val, min, max));
    }
    break;
    case DT_BOOL:
    {
      if(strcasecmp(value, "true") && strcasecmp(value, "false"))
        result = g_strdup(dt_confgen_get(name, DT_DEFAULT));
      else
        result = g_strdup(value);
    }
    break;
    case DT_ENUM:
    {
      char *v = g_strdup_printf("[%s]", value);
      if(!strstr(item->enum_values, v))
        result = g_strdup(dt_confgen_get(name, DT_DEFAULT));
      else
        result = g_strdup(value);
      dt_free(v);
    }
    break;
    default:
      result = g_strdup(value);
      break;
  }
 
  return result;
}
 
void dt_conf_init(dt_conf_t *cf, const char *filename, GSList *override_entries)
{
  cf->x_confgen = g_hash_table_new_full(g_str_hash, g_str_equal, dt_free_gpointer, _free_confgen_value);
 
  cf->table = g_hash_table_new_full(g_str_hash, g_str_equal, dt_free_gpointer, dt_free_gpointer);
  cf->override_entries = g_hash_table_new_full(g_str_hash, g_str_equal, dt_free_gpointer, dt_free_gpointer);
  dt_pthread_mutex_init(&darktable.conf->mutex, NULL);
 
  // init conf filename
  g_strlcpy(darktable.conf->filename, filename, sizeof(darktable.conf->filename));
 
#define LINE_SIZE 1023
 
  char line[LINE_SIZE + 1];
 
  FILE *f = NULL;
 
  // check for user config
  f = g_fopen(filename, "rb");
 
  // if file has been found, parse it
 
  if(!IS_NULL_PTR(f))
  {
    while(!feof(f))
    {
      const int read = fscanf(f, "%" STR(LINE_SIZE) "[^\r\n]\r\n", line);
      if(read > 0)
      {
        char *c = line;
        char *end = line + strlen(line);
        // check for '=' which is separator between the conf name and value
        while(*c != '=' && c < end) c++;
 
        if(*c == '=')
        {
          *c = '\0';
 
          char *name = g_strdup(line);
          // ensure that numbers are properly clamped if min/max
          // defined and if not and garbage is read then the default
          // value is returned.
          char *value = _sanitize_confgen(name, (const char *)(c + 1));
 
          g_hash_table_insert(darktable.conf->table, name, value);
        }
      }
    }
    fclose(f);
  }
  else
  {
    // we initialize the conf table with default values
    GHashTableIter iter;
    gpointer key, value;
 
    g_hash_table_iter_init (&iter, darktable.conf->x_confgen);
    while (g_hash_table_iter_next (&iter, &key, &value))
    {
      const char *name = (const char *)key;
      const dt_confgen_value_t *entry = (dt_confgen_value_t *)value;
      g_hash_table_insert(darktable.conf->table, g_strdup(name), g_strdup(entry->def));
    }
  }
 
  if(!IS_NULL_PTR(override_entries))
  {
    for(GSList *p = override_entries; p; p = g_slist_next(p))
    {
      dt_conf_string_entry_t *entry = (dt_conf_string_entry_t *)p->data;
      g_hash_table_insert(darktable.conf->override_entries, entry->key, entry->value);
    }
  }
 
#undef LINE_SIZE
 
  return;
}
 
int dt_conf_key_exists(const char *key)
{
  dt_pthread_mutex_lock(&darktable.conf->mutex);
  const int res = (g_hash_table_lookup(darktable.conf->table, key) != NULL)
                  || (g_hash_table_lookup(darktable.conf->override_entries, key) != NULL);
  dt_pthread_mutex_unlock(&darktable.conf->mutex);
  return (res || dt_confgen_value_exists(key, DT_DEFAULT));
}
 
static void _conf_add(char *key, char *val, dt_conf_dreggn_t *d)
{
  if(strncmp(key, d->match, strlen(d->match)) == 0)
  {
    dt_conf_string_entry_t *nv = (dt_conf_string_entry_t *)g_malloc(sizeof(dt_conf_string_entry_t));
    nv->key = g_strdup(key + strlen(d->match) + 1);
    nv->value = g_strdup(val);
    d->result = g_slist_append(d->result, nv);
  }
}
 
GSList *dt_conf_all_string_entries(const char *dir)
{
  dt_pthread_mutex_lock(&darktable.conf->mutex);
  dt_conf_dreggn_t d;
  d.result = NULL;
  d.match = dir;
  g_hash_table_foreach(darktable.conf->table, (GHFunc)_conf_add, &d);
  dt_pthread_mutex_unlock(&darktable.conf->mutex);
  return d.result;
}
 
void dt_conf_string_entry_free(gpointer data)
{
  dt_conf_string_entry_t *nv = (dt_conf_string_entry_t *)data;
  dt_free(nv->key);
  dt_free(nv->value);
  nv->key = NULL;
  nv->value = NULL;
  dt_free(nv);
}
 
gboolean dt_confgen_exists(const char *name)
{
  return g_hash_table_lookup(darktable.conf->x_confgen, name) != NULL;
}
 
dt_confgen_type_t dt_confgen_type(const char *name)
{
  const dt_confgen_value_t *item = g_hash_table_lookup(darktable.conf->x_confgen, name);
 
  if(!IS_NULL_PTR(item))
    return item->type;
  else
    return DT_STRING;
}
 
gboolean dt_confgen_value_exists(const char *name, dt_confgen_value_kind_t kind)
{
  const dt_confgen_value_t *item = g_hash_table_lookup(darktable.conf->x_confgen, name);
  if(IS_NULL_PTR(item))
    return FALSE;
 
  switch(kind)
  {
     case DT_DEFAULT:
       return !IS_NULL_PTR(item->def);
     case DT_MIN:
       return !IS_NULL_PTR(item->min);
     case DT_MAX:
       return !IS_NULL_PTR(item->max);
     case DT_VALUES:
       return !IS_NULL_PTR(item->enum_values);
  }
  return FALSE;
}
 
const char *dt_confgen_get(const char *name, dt_confgen_value_kind_t kind)
{
  const dt_confgen_value_t *item = g_hash_table_lookup(darktable.conf->x_confgen, name);
 
  if(!IS_NULL_PTR(item))
  {
    switch(kind)
    {
       case DT_DEFAULT:
         return item->def;
       case DT_MIN:
         return item->min;
       case DT_MAX:
         return item->max;
       case DT_VALUES:
         return item->enum_values;
    }
  }
 
  return "";
}
 
const char *dt_confgen_get_label(const char *name)
{
  const dt_confgen_value_t *item = g_hash_table_lookup(darktable.conf->x_confgen, name);
 
  if(!IS_NULL_PTR(item))
  {
    return item->shortdesc;
  }
 
  return "";
}
 
const char *dt_confgen_get_tooltip(const char *name)
{
  const dt_confgen_value_t *item = g_hash_table_lookup(darktable.conf->x_confgen, name);
 
  if(!IS_NULL_PTR(item))
  {
    return item->longdesc;
  }
 
  return "";
}
 
int dt_confgen_get_int(const char *name, dt_confgen_value_kind_t kind)
{
  if(!dt_confgen_value_exists(name, kind))
  {
    //early bail
    switch (kind)
    {
    case DT_MIN:
      return INT_MIN;
      break;
    case DT_MAX:
      return INT_MAX;
      break;
    default:
      return 0;
      break;
    }
  }
  const char *str = dt_confgen_get(name, kind);
 
  //if str is NULL or empty, dt_calculator_solve will return NAN
  const float value = dt_calculator_solve(1, str);
 
  switch (kind)
  {
  case DT_MIN:
    return isnan(value) ? INT_MIN : (value > 0 ? value + 0.5f : value - 0.5f);
    break;
  case DT_MAX:
    return isnan(value) ? INT_MAX : (value > 0 ? value + 0.5f : value - 0.5f);
    break;
  default:
    return isnan(value) ? 0.0f : (value > 0 ? value + 0.5f : value - 0.5f);
    break;
  }
  return (int)value;
}
 
int64_t dt_confgen_get_int64(const char *name, dt_confgen_value_kind_t kind)
{
  if(!dt_confgen_value_exists(name, kind))
  {
    //early bail
    switch (kind)
    {
    case DT_MIN:
      return INT64_MIN;
      break;
    case DT_MAX:
      return INT64_MAX;
      break;
    default:
      return 0;
      break;
    }
  }
  const char *str = dt_confgen_get(name, kind);
 
  //if str is NULL or empty, dt_calculator_solve will return NAN
  const float value = dt_calculator_solve(1, str);
 
  switch (kind)
  {
  case DT_MIN:
    return isnan(value) ? INT64_MIN : (value > 0 ? value + 0.5f : value - 0.5f);
    break;
  case DT_MAX:
    return isnan(value) ? INT64_MAX : (value > 0 ? value + 0.5f : value - 0.5f);
    break;
  default:
    return isnan(value) ? 0.0f : (value > 0 ? value + 0.5f : value - 0.5f);
    break;
  }
  return (int64_t)value;
}
 
gboolean dt_confgen_get_bool(const char *name, dt_confgen_value_kind_t kind)
{
  const char *str = dt_confgen_get(name, kind);
  return !strcmp(str, "true");
}
 
float dt_confgen_get_float(const char *name, dt_confgen_value_kind_t kind)
{
  if(!dt_confgen_value_exists(name, kind))
  {
    //early bail
    switch (kind)
    {
    case DT_MIN:
      return -FLT_MAX;
      break;
    case DT_MAX:
      return FLT_MAX;
      break;
    default:
      break;
    }
    return 0.0f;
  }
 
  const char *str = dt_confgen_get(name, kind);
 
  //if str is NULL or empty, dt_calculator_solve will return NAN
  const float value = dt_calculator_solve(1, str);
 
  switch (kind)
  {
  case DT_MIN:
    // to anyone askig FLT_MIN is superclose to 0, not furthest value from 0 possible in float
    return isnan(value) ? -FLT_MAX : value;
    break;
  case DT_MAX:
    return isnan(value) ? FLT_MAX : value;
    break;
  default:
    break;
  }
  return isnan(value) ? 0.0f : value;
}
 
gboolean dt_conf_is_default(const char *name)
{
  if(!dt_confgen_exists(name))
    return TRUE; // well if default doesn't know about it, it's default
 
  switch(dt_confgen_type(name))
  {
  case DT_INT:
    return dt_conf_get_int(name) == dt_confgen_get_int(name, DT_DEFAULT);
    break;
  case DT_INT64:
    return dt_conf_get_int64(name) == dt_confgen_get_int64(name, DT_DEFAULT);
    break;
  case DT_FLOAT:
    return dt_conf_get_float(name) == dt_confgen_get_float(name, DT_DEFAULT);
    break;
  case DT_BOOL:
    return dt_conf_get_bool(name) == dt_confgen_get_bool(name, DT_DEFAULT);
    break;
  case DT_PATH:
  case DT_STRING:
  case DT_ENUM:
  default:
    {
      const char *def_val = dt_confgen_get(name, DT_DEFAULT);
      const char *cur_val = dt_conf_get_var(name);
      return g_strcmp0(def_val, cur_val) == 0;
      break;
    }
  }
}
 
gchar* dt_conf_expand_default_dir(const char *dir)
{
  // expand special dirs
#define CONFIG_DIR "$(config)"
#define HOME_DIR   "$(home)"
 
  gchar *path = NULL;
  if(g_str_has_prefix(dir, CONFIG_DIR))
  {
    gchar configdir[PATH_MAX] = { 0 };
    dt_loc_get_user_config_dir(configdir, sizeof(configdir));
    path = g_strdup_printf("%s%s", configdir, dir + strlen(CONFIG_DIR));
  }
  else if(g_str_has_prefix(dir, HOME_DIR))
  {
    gchar *homedir = dt_loc_get_home_dir(NULL);
    path = g_strdup_printf("%s%s", homedir, dir + strlen(HOME_DIR));
    dt_free(homedir);
  }
  else path = g_strdup(dir);
 
  gchar *normalized_path = dt_util_normalize_path(path);
  dt_free(path);
 
  return normalized_path;
}
 
static void dt_conf_print(const gchar *key, const gchar *val, FILE *f)
{
  fprintf(f, "%s=%s\n", key, val);
}
 
void dt_conf_save(dt_conf_t *cf)
{
  FILE *f = g_fopen(cf->filename, "wb");
  if(!IS_NULL_PTR(f))
  {
    GList *keys = g_hash_table_get_keys(cf->table);
    GList *sorted = g_list_sort(keys, (GCompareFunc)g_strcmp0);
 
    for(GList *iter = sorted; iter; iter = g_list_next(iter))
    {
      const gchar *key = (const gchar *)iter->data;
      const gchar *val = (const gchar *)g_hash_table_lookup(cf->table, key);
      dt_conf_print(key, val, f);
    }
 
    g_list_free(sorted);
    sorted = NULL;
    fclose(f);
  }
}
void dt_conf_cleanup(dt_conf_t *cf)
{
  dt_conf_save(cf);
  g_hash_table_unref(cf->table);
  g_hash_table_unref(cf->override_entries);
  g_hash_table_unref(cf->x_confgen);
  dt_pthread_mutex_destroy(&darktable.conf->mutex);
}
 
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// modelines: These editor modelines have been set for all relevant files by tools/update_modelines.py
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// clang-format on