Implement first page column list

zathura/callbacks.c

@@ -243,8 +243,13 @@ cb_page_layout_value_changed(girara_session_t* session, const char* name, girara
   unsigned int pages_per_row = 1;
   girara_setting_get(session, "pages-per-row", &pages_per_row);
 
-  unsigned int first_page_column = 1;
-  girara_setting_get(session, "first-page-column", &first_page_column);
+  /* get list of first_page_column settings */
+  char* first_page_column_list = NULL;
+  girara_setting_get(session, "first-page-column", &first_page_column_list);
+
+  /* find value for first_page_column */
+  unsigned int first_page_column = find_first_page_column(first_page_column_list, pages_per_row);
+  g_free(first_page_column_list);
 
   unsigned int page_padding = 1;
   girara_setting_get(zathura->ui.session, "page-padding", &page_padding);

zathura/utils.c

@@ -253,3 +253,33 @@ get_selection(zathura_t* zathura)
 
   return selection;
 }
+
+unsigned int
+find_first_page_column(const char* first_page_column_list,
+                       const unsigned int pages_per_row)
+{
+  /* sanity checks */
+  unsigned int first_page_column = 1;
+  g_return_val_if_fail(first_page_column_list != NULL,     first_page_column);
+  g_return_val_if_fail(strcmp(first_page_column_list, ""), first_page_column);
+  g_return_val_if_fail(pages_per_row > 0,                  first_page_column);
+
+  /* split settings list */
+  char** settings = g_strsplit(first_page_column_list, ":", pages_per_row+1);
+
+  size_t settings_size = 0;
+  while (settings[settings_size] != NULL) {
+    ++settings_size;
+  }
+
+  /* read setting value corresponding to the specified pages per row */
+  unsigned int index = pages_per_row - 1;
+  if (settings_size > index && strcmp(settings[index], "")) {
+    first_page_column = atoi(settings[index]);
+  }
+
+  /* free buffers */
+  g_strfreev(settings);
+
+  return first_page_column;
+}

zathura/utils.h

@@ -107,4 +107,17 @@ GdkAtom* get_selection(zathura_t* zathura);
 double zathura_correct_scale_value(girara_session_t* session, const double
     scale);
 
+
+/**
+ * Extracts the column the first page should be rendered in from the specified
+ * list of settings corresponding to the specified pages per row
+ *
+ * @param[in] first_page_column_list The settings list
+ * @param[in] pages_per_row The current pages per row
+ *
+ * @return The column the first page should be rendered in
+ */
+unsigned int find_first_page_column(const char* first_page_column_list,
+                                    const unsigned int pages_per_row);
+
 #endif // UTILS_H

zathura/zathura.c

@@ -857,7 +857,6 @@ document_open(zathura_t* zathura, const char* path, const char* password,
 
   /* view mode */
   unsigned int pages_per_row = 1;
-  unsigned int first_page_column = 1;
   char* first_page_column_list = first_page_column_list_default;
   unsigned int page_padding = 1;
 
@@ -873,11 +872,15 @@ document_open(zathura_t* zathura, const char* path, const char* password,
   if (strcmp(file_info.first_page_column_list, "")) {
     first_page_column_list = file_info.first_page_column_list;
   } else {
-    girara_setting_get(zathura->ui.session, "first-page-column", &first_page_column);
+    girara_setting_get(zathura->ui.session, "first-page-column", &first_page_column_list);
   }
 
+  /* find value for first_page_column */
+  unsigned int first_page_column = find_first_page_column(first_page_column_list, pages_per_row);
+
   girara_setting_set(zathura->ui.session, "pages-per-row", &pages_per_row);
-  girara_setting_set(zathura->ui.session, "first-page-column", &first_page_column);
+  girara_setting_set(zathura->ui.session, "first-page-column", first_page_column_list);
+  g_free(first_page_column_list);
 
   page_widget_set_mode(zathura, page_padding, pages_per_row, first_page_column);
   zathura_document_set_page_layout(zathura->document, page_padding, pages_per_row, first_page_column);
@@ -1097,6 +1100,9 @@ document_close(zathura_t* zathura, bool keep_monitor)
     zathura_db_save_jumplist(zathura->database, path, zathura->jumplist.list);
   }
 
+  /* free buffers */
+  g_free(file_info.first_page_column_list);
+
   girara_list_iterator_free(zathura->jumplist.cur);
   zathura->jumplist.cur = NULL;
   girara_list_free(zathura->jumplist.list);