Add select entities and implement template select (#2067)

Co-authored-by: Otto Winter <otto@otto-winter.com>

esphome/components/template/select/template_select.cpp

@@ -0,0 +1,74 @@
+#include "template_select.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace template_ {
+
+static const char *const TAG = "template.select";
+
+void TemplateSelect::setup() {
+  if (this->f_.has_value())
+    return;
+
+  std::string value;
+  ESP_LOGD(TAG, "Setting up Template Number");
+  if (!this->restore_value_) {
+    value = this->initial_option_;
+    ESP_LOGD(TAG, "State from initial: %s", value.c_str());
+  } else {
+    size_t index;
+    this->pref_ = global_preferences.make_preference<size_t>(this->get_object_id_hash());
+    if (!this->pref_.load(&index)) {
+      value = this->initial_option_;
+      ESP_LOGD(TAG, "State from initial (could not load): %s", value.c_str());
+    } else {
+      value = this->traits.get_options().at(index);
+      ESP_LOGD(TAG, "State from restore: %s", value.c_str());
+    }
+  }
+
+  this->publish_state(value);
+}
+
+void TemplateSelect::update() {
+  if (!this->f_.has_value())
+    return;
+
+  auto val = (*this->f_)();
+  if (!val.has_value())
+    return;
+
+  auto options = this->traits.get_options();
+  if (std::find(options.begin(), options.end(), *val) == options.end()) {
+    ESP_LOGE(TAG, "lambda returned an invalid option %s", (*val).c_str());
+    return;
+  }
+
+  this->publish_state(*val);
+}
+
+void TemplateSelect::control(const std::string &value) {
+  this->set_trigger_->trigger(value);
+
+  if (this->optimistic_)
+    this->publish_state(value);
+
+  if (this->restore_value_) {
+    auto options = this->traits.get_options();
+    size_t index = std::find(options.begin(), options.end(), value) - options.begin();
+
+    this->pref_.save(&index);
+  }
+}
+void TemplateSelect::dump_config() {
+  LOG_SELECT("", "Template Select", this);
+  LOG_UPDATE_INTERVAL(this);
+  if (this->f_.has_value())
+    return;
+  ESP_LOGCONFIG(TAG, "  Optimistic: %s", YESNO(this->optimistic_));
+  ESP_LOGCONFIG(TAG, "  Initial Option: %s", this->initial_option_.c_str());
+  ESP_LOGCONFIG(TAG, "  Restore Value: %s", YESNO(this->restore_value_));
+}
+
+}  // namespace template_
+}  // namespace esphome