src/preferences.c

   1 #include <gtk/gtk.h>
   2 #include <glib/gi18n.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include "preferences.h"
   7 #include "file.h"
   8
   9 // TODO: register_group
  10 // TODO: STRING_LIST
  11 // TODO: share code in file reading
  12 // TODO: remove hackaround in show_window
  13 // TODO: move typeddata to uibuilder, make it more used & general, it's a "prettier" solution methinks
  14 // maybe this wasn't such a good idea...
  15
  16 #define VIKING_PREFS_FILE "viking.prefs"
  17
  18 #define TEST_BOOLEAN(str) (! ((str)[0] == '\0' || (str)[0] == '0' || (str)[0] == 'n' || (str)[0] == 'N' || (str)[0] == 'f' || (str)[0] == 'F') )
  19
  20 static GPtrArray *params;
  21 static GHashTable *values;
  22 gboolean loaded;
  23
  24 /************ groups *********/
  25
  26 static GPtrArray *groups_names;
  27 static GHashTable *groups_keys_to_indices; // contains gint, NULL (0) is not found, instead 1 is used for 0, 2 for 1, etc.
  28
  29 static void preferences_groups_init()
  30 {
  31   groups_names = g_ptr_array_new();
  32   groups_keys_to_indices = g_hash_table_new_full ( g_str_hash, g_str_equal, g_free, NULL );
  33 }
  34
  35 static void preferences_groups_uninit()
  36 {
  37   g_ptr_array_free ( groups_names, TRUE );
  38   g_hash_table_destroy ( groups_keys_to_indices );
  39 }
  40
  41 void a_preferences_register_group ( const gchar *key, const gchar *name )
  42 {
  43   if ( g_hash_table_lookup ( groups_keys_to_indices, key ) )
  44     g_error("Duplicate preferences group keys");
  45   else {
  46     g_ptr_array_add ( groups_names, g_strdup(name) );
  47     g_hash_table_insert ( groups_keys_to_indices, g_strdup(key), (gpointer) ((gint) groups_names->len ) ); /* index + 1 */
  48   }
  49 }
  50
  51 /* returns -1 if not found. */
  52 static gint16 preferences_groups_key_to_index( const gchar *key )
  53 {
  54   gint index = (gint) g_hash_table_lookup ( groups_keys_to_indices, key );
  55   if ( ! index )
  56     return VIK_LAYER_GROUP_NONE; /* which should be -1 anyway */
  57   return (gint16) (index - 1);
  58 }
  59
  60 /*****************************/
  61
  62 /************/
  63
  64 typedef struct {
  65   VikLayerParamData data;
  66   guint8 type;
  67   gpointer freeme; // because data.s is const and the compiler complains
  68 } VikLayerTypedParamData;
  69
  70 void layer_typed_param_data_free(gpointer p)
  71 {
  72   VikLayerTypedParamData *val = (VikLayerTypedParamData *)p;
  73   switch ( val->type ) {
  74     case VIK_LAYER_PARAM_STRING:
  75       if ( val->freeme )
  76         g_free ( val->freeme );
  77       break;
  78     /* TODO: APPLICABLE TO US? NOTE: string layer works auniquely: data.sl should NOT be free'd when
  79      * the internals call get_param -- i.e. it should be managed w/in the layer.
  80      * The value passed by the internals into set_param should also be managed
  81      * by the layer -- i.e. free'd by the layer.
  82      */
  83     case VIK_LAYER_PARAM_STRING_LIST:
  84       g_error ( "Param strings not implemented in preferences"); //fake it
  85       break;
  86   }
  87   g_free ( val );
  88 }
  89
  90 VikLayerTypedParamData *layer_typed_param_data_copy_from_data(guint8 type, VikLayerParamData val) {
  91   VikLayerTypedParamData *newval = g_new(VikLayerTypedParamData,1);
  92   newval->data = val;
  93   newval->type = type;
  94   switch ( newval->type ) {
  95     case VIK_LAYER_PARAM_STRING: {
  96       gchar *s = g_strdup(newval->data.s);
  97       newval->data.s = s;
  98       newval->freeme = s;
  99       break;
 100     }
 101     /* TODO: APPLICABLE TO US? NOTE: string layer works auniquely: data.sl should NOT be free'd when
 102      * the internals call get_param -- i.e. it should be managed w/in the layer.
 103      * The value passed by the internals into set_param should also be managed
 104      * by the layer -- i.e. free'd by the layer.
 105      */
 106     case VIK_LAYER_PARAM_STRING_LIST:
 107       g_error ( "Param strings not implemented in preferences"); //fake it
 108       break;
 109   }
 110   return newval;
 111 }
 112
 113 /* TODO: share this code with file.c */
 114 VikLayerTypedParamData *layer_data_typed_param_copy_from_string ( guint8 type, const gchar *str )
 115 {
 116   g_assert ( type != VIK_LAYER_PARAM_STRING_LIST );
 117   VikLayerTypedParamData *rv = g_new(VikLayerTypedParamData,1);
 118   rv->type = type;
 119   switch ( type )
 120   {
 121     case VIK_LAYER_PARAM_DOUBLE: rv->data.d = strtod(str, NULL); break;
 122     case VIK_LAYER_PARAM_UINT: rv->data.u = strtoul(str, NULL, 10); break;
 123     case VIK_LAYER_PARAM_INT: rv->data.i = strtol(str, NULL, 10); break;
 124     case VIK_LAYER_PARAM_BOOLEAN: rv->data.b = TEST_BOOLEAN(str); break;
 125     case VIK_LAYER_PARAM_COLOR: memset(&(rv->data.c), 0, sizeof(rv->data.c)); /* default: black */
 126       gdk_color_parse ( str, &(rv->data.c) ); break;
 127     /* STRING or STRING_LIST -- if STRING_LIST, just set param to add a STRING */
 128     default: {
 129       gchar *s = g_strdup(str);
 130       rv->data.s = s;
 131       rv->freeme = s;
 132     }
 133   }
 134   return rv;
 135 }
 136
 137 /************/
 138
 139 /* MAKES A COPY OF THE KEY!!! */
 140 static gboolean preferences_load_parse_param(gchar *buf, gchar **key, gchar **val )
 141 {
 142   gchar *eq_pos;
 143   gint len;
 144
 145   // comments, special characters in viking file format
 146   if ( buf == NULL || buf[0] == '\0' || buf[0] == '~' || buf[0] == '=' || buf[0] == '#' )
 147     return FALSE;
 148   eq_pos = strchr ( buf, '=' );
 149   if ( ! eq_pos )
 150     return FALSE;
 151   *key = g_strndup ( buf, eq_pos - buf );
 152   *val = eq_pos + 1;
 153   len = strlen(*val);
 154   if ( len > 0 )
 155     if ( (*val)[len - 1] == '\n' )
 156       (*val) [ len - 1 ] = '\0'; /* cut off newline */
 157   return TRUE;
 158 }
 159
 160 static gboolean preferences_load_from_file()
 161 {
 162   gchar *fn = g_build_filename(a_get_viking_dir(), VIKING_PREFS_FILE, NULL);
 163   FILE *f = g_fopen(fn, "r");
 164   g_free ( fn );
 165
 166   if ( f ) {
 167     gchar buf[4096];
 168     gchar *key, *val;
 169     VikLayerTypedParamData *oldval, *newval;
 170     while ( ! feof (f) ) {
 171       fgets(buf,sizeof(buf),f);
 172       if ( preferences_load_parse_param(buf, &key, &val ) ) {
 173         // if it's not in there, ignore it
 174         oldval = g_hash_table_lookup ( values, key );
 175         if ( ! oldval ) {
 176           g_free(key);
 177           continue;
 178         }
 179
 180         // otherwise change it (you know the type!)
 181         // if it's a string list do some funky stuff ... yuck... not yet.
 182         if ( oldval->type == VIK_LAYER_PARAM_STRING_LIST )
 183           g_error ( "Param strings not implemented in preferences"); // fake it
 184
 185         newval = layer_data_typed_param_copy_from_string ( oldval->type, val );
 186         g_hash_table_insert ( values, key, newval );
 187
 188         g_free(key);
 189
 190         // change value
 191       }
 192     }
 193     fclose(f);
 194     f = NULL;
 195     return TRUE;
 196   }
 197   return FALSE;
 198 }
 199
 200 static void preferences_run_setparam ( gpointer notused, guint16 i, VikLayerParamData data, VikLayerParam *params )
 201 {
 202   if ( params[i].type == VIK_LAYER_PARAM_STRING_LIST )
 203     g_error ( "Param strings not implemented in preferences"); //fake it
 204   g_hash_table_insert ( values, (gchar *)(params[i].name), layer_typed_param_data_copy_from_data(params[i].type, data) );
 205 }
 206
 207 static VikLayerParamData preferences_run_getparam ( gpointer notused, guint16 i )
 208 {
 209   VikLayerTypedParamData *val = (VikLayerTypedParamData *) g_hash_table_lookup ( values, ((VikLayerParam *)g_ptr_array_index(params,i))->name );
 210   g_assert ( val != NULL );
 211   if ( val->type == VIK_LAYER_PARAM_STRING_LIST )
 212     g_error ( "Param strings not implemented in preferences"); //fake it
 213   return val->data;
 214 }
 215
 216 /* TRUE on success */
 217 static gboolean preferences_save_to_file()
 218 {
 219   gchar *fn = g_build_filename(a_get_viking_dir(), VIKING_PREFS_FILE, NULL);
 220
 221   // TODO: error checking
 222   FILE *f = g_fopen(fn, "w");
 223   g_free ( fn );
 224
 225   if ( f ) {
 226     VikLayerParam *param;
 227     VikLayerTypedParamData *val;
 228     int i;
 229     for ( i = 0; i < params->len; i++ ) {
 230       param = (VikLayerParam *) g_ptr_array_index(params,i);
 231       val = (VikLayerTypedParamData *) g_hash_table_lookup ( values, param->name );
 232       g_assert ( val != NULL );
 233       file_write_layer_param ( f, param->name, val->type, val->data );
 234     }
 235     fclose(f);
 236     f = NULL;
 237     return TRUE;
 238   }
 239
 240   return FALSE;
 241 }
 242
 243
 244 void a_preferences_show_window(GtkWindow *parent) {
 245     //VikLayerParamData *a_uibuilder_run_dialog ( GtkWindow *parent, VikLayerParam \*params, // guint16 params_count, gchar **groups, guint8 groups_count, // VikLayerParamData *params_defaults )
 246     // TODO: THIS IS A MAJOR HACKAROUND, but ok when we have only a couple preferences.
 247     gint params_count = params->len;
 248     VikLayerParam *contiguous_params = g_new(VikLayerParam,params_count);
 249     int i;
 250     for ( i = 0; i < params->len; i++ ) {
 251       contiguous_params[i] = *((VikLayerParam*)(g_ptr_array_index(params,i)));
 252     }
 253     loaded = TRUE;
 254     preferences_load_from_file();
 255     if ( a_uibuilder_properties_factory ( parent, contiguous_params, params_count,
 256                                 (gchar **) groups_names->pdata, groups_names->len, // groups, groups_count, // groups? what groups?!
 257                                 (gboolean (*) (gpointer,guint16,VikLayerParamData,gpointer)) preferences_run_setparam,
 258                                 NULL /* not used */, contiguous_params,
 259                                 preferences_run_getparam, NULL /* not used */ ) ) {
 260       preferences_save_to_file();
 261     }
 262     g_free ( contiguous_params );
 263 }
 264
 265 void a_preferences_register(VikLayerParam *pref, VikLayerParamData defaultval, const gchar *group_key )
 266 {
 267   /* copy value */
 268   VikLayerParam *newpref = g_new(VikLayerParam,1);
 269   *newpref = *pref;
 270   VikLayerTypedParamData *newval = layer_typed_param_data_copy_from_data(pref->type, defaultval);
 271   if ( group_key )
 272     newpref->group = preferences_groups_key_to_index ( group_key );
 273
 274   g_ptr_array_add ( params, newpref );
 275   g_hash_table_insert ( values, (gchar *)pref->name, newval );
 276 }
 277
 278 void a_preferences_init()
 279 {
 280   preferences_groups_init();
 281
 282   /* not copied */
 283   params = g_ptr_array_new ();
 284
 285   /* key not copied (same ptr as in pref), actual param data yes */
 286   values = g_hash_table_new_full ( g_str_hash, g_str_equal, NULL, layer_typed_param_data_free);
 287
 288   loaded = FALSE;
 289 }
 290
 291 void a_preferences_uninit()
 292 {
 293   preferences_groups_uninit();
 294
 295   g_ptr_array_free ( params, TRUE );
 296   g_hash_table_destroy ( values );
 297 }
 298
 299
 300
 301 VikLayerParamData *a_preferences_get(const gchar *key)
 302 {
 303   if ( ! loaded ) {
 304     /* since we can't load the file in a_preferences_init (no params registered yet),
 305      * do it once before we get the first key. */
 306     preferences_load_from_file();
 307     loaded = TRUE;
 308   }
 309   return g_hash_table_lookup ( values, key );
 310 }