feat: add default search engine option

src/Routes/Search.c

@@ -417,7 +417,11 @@ int results_handler(UrlParams *params) {
   extern Config global_config;
   TemplateContext ctx = new_context();
   char *raw_query = "";
-  const char *selected_engine_id = "all";
+  char selected_engine_id[32];
+  char *default_engine = get_default_search_engine();
+  snprintf(selected_engine_id, sizeof(selected_engine_id), "%s",
+           default_engine);
+  free(default_engine);
   int page = 1;
   int btnI = 0;
 
@@ -435,7 +439,8 @@ int results_handler(UrlParams *params) {
         if (parsed > 1)
           page = parsed;
       } else if (strcmp(params->params[i].key, "engine") == 0) {
-        selected_engine_id = params->params[i].value;
+        snprintf(selected_engine_id, sizeof(selected_engine_id), "%s",
+                 params->params[i].value);
       } else if (strcmp(params->params[i].key, "btnI") == 0) {
         btnI = atoi(params->params[i].value);
       }
@@ -481,8 +486,17 @@ int results_handler(UrlParams *params) {
   }
 
   const SearchEngine *selected_engine = find_enabled_engine(selected_engine_id);
-  if (!selected_engine)
-    selected_engine_id = "all";
+  if (selected_engine &&
+      !engine_allowed_for_user(selected_engine, user_engines,
+                               user_engine_count, has_user_pref)) {
+    selected_engine = NULL;
+  }
+  if (selected_engine) {
+    snprintf(selected_engine_id, sizeof(selected_engine_id), "%s",
+             selected_engine->id);
+  } else {
+    snprintf(selected_engine_id, sizeof(selected_engine_id), "all");
+  }
 
   context_set(&ctx, "selected_engine", selected_engine_id);
   char *search_href = build_search_href(raw_query, selected_engine_id, 1);

src/Routes/Settings.c

@@ -34,6 +34,14 @@ int settings_handler(UrlParams *params) {
   int user_engine_count = 0;
   int has_user_pref =
       (get_user_engines(&user_engines, &user_engine_count) == 0);
+  char *default_engine = get_default_search_engine();
+
+  if (strcmp(default_engine, "all") != 0 && has_user_pref &&
+      !user_engines_contains(default_engine, user_engines,
+                             user_engine_count)) {
+    free(default_engine);
+    default_engine = strdup("all");
+  }
 
   int enabled_count = 0;
   for (int i = 0; i < ENGINE_COUNT; i++) {
@@ -63,11 +71,13 @@ int settings_handler(UrlParams *params) {
         }
       }
 
-      engine_data[idx] = malloc(sizeof(char *) * 3);
+      engine_data[idx] = malloc(sizeof(char *) * 4);
       engine_data[idx][0] = (char *)ENGINE_REGISTRY[i].id;
       engine_data[idx][1] = (char *)ENGINE_REGISTRY[i].name;
       engine_data[idx][2] = is_selected ? "checked" : "";
-      engine_inner[idx] = 3;
+      engine_data[idx][3] =
+          strcmp(default_engine, ENGINE_REGISTRY[i].id) == 0 ? "selected" : "";
+      engine_inner[idx] = 4;
 
       idx++;
     }
@@ -78,6 +88,7 @@ int settings_handler(UrlParams *params) {
   context_set(&ctx, "query", query);
   context_set(&ctx, "theme", theme);
   context_set(&ctx, "locale", locale);
+  context_set(&ctx, "default_engine", default_engine);
   context_set_array_of_arrays(&ctx, "locales", locale_data, locale_count,
                               inner_counts);
 
@@ -132,6 +143,7 @@ int settings_handler(UrlParams *params) {
   send_response(rendered_html);
 
   free(rendered_html);
+  free(default_engine);
   free(theme);
   free(locale);
   free_context(&ctx);

src/Routes/SettingsSave.c

@@ -10,6 +10,8 @@ int settings_save_handler(UrlParams *params) {
   const char *theme = "";
   const char *locale = "";
   const char *query = "";
+  const char *default_engine = "all";
+  int default_engine_present = 0;
   int engines_present = 0;
   char selected_ids[ENGINE_COUNT][32];
   int selected_count = 0;
@@ -22,6 +24,9 @@ int settings_save_handler(UrlParams *params) {
         locale = params->params[i].value;
       } else if (strcmp(params->params[i].key, "q") == 0) {
         query = params->params[i].value;
+      } else if (strcmp(params->params[i].key, "default_engine") == 0) {
+        default_engine = params->params[i].value;
+        default_engine_present = 1;
       } else if (strcmp(params->params[i].key, "engines_present") == 0) {
         engines_present = 1;
       } else if (strncmp(params->params[i].key, "engine_", 7) == 0 &&
@@ -58,6 +63,31 @@ int settings_save_handler(UrlParams *params) {
                false, false);
   }
 
+  if (default_engine_present) {
+    const char *validated_default = "all";
+
+    for (int i = 0; i < ENGINE_COUNT; i++) {
+      if (!ENGINE_REGISTRY[i].enabled ||
+          strcmp(default_engine, ENGINE_REGISTRY[i].id) != 0)
+        continue;
+
+      int selected = !engines_present;
+      for (int j = 0; j < selected_count; j++) {
+        if (strcmp(selected_ids[j], ENGINE_REGISTRY[i].id) == 0) {
+          selected = 1;
+          break;
+        }
+      }
+
+      if (selected)
+        validated_default = ENGINE_REGISTRY[i].id;
+      break;
+    }
+
+    set_cookie("default_engine", validated_default,
+               "Fri, 31 Dec 2038 23:59:59 GMT", "/", false, false);
+  }
+
   char redirect_url[512];
   snprintf(redirect_url, sizeof(redirect_url), "/settings?q=%s", query);
   send_redirect(redirect_url);

src/Utility/Utility.c

@@ -217,6 +217,15 @@ int user_engines_contains(const char *engine_id, char **ids, int count) {
   return 0;
 }
 
+char *get_default_search_engine(void) {
+  char *cookie = get_cookie("default_engine");
+  if (cookie && (strcmp(cookie, "all") == 0 || is_engine_id_enabled(cookie)))
+    return cookie;
+
+  free(cookie);
+  return strdup("all");
+}
+
 void free_string_matrix(char ***matrix, int *inner_counts, int row_count) {
   if (matrix) {
     for (int i = 0; i < row_count; i++) {

src/Utility/Utility.h

@@ -30,6 +30,7 @@ char *get_locale(const char *default_locale);
 int is_engine_id_enabled(const char *engine_id);
 int get_user_engines(char ***out_ids, int *out_count);
 int user_engines_contains(const char *engine_id, char **ids, int count);
+char *get_default_search_engine(void);
 
 void free_string_matrix(char ***matrix, int *inner_counts, int row_count);