[web_server_idf] Use C++17 nested namespace style

esphome/components/web_server_idf/multipart.cpp

@@ -6,8 +6,7 @@
 #include <cstring>
 #include "multipart_parser.h"
 
-namespace esphome {
-namespace web_server_idf {
+namespace esphome::web_server_idf {
 
 static const char *const TAG = "multipart";
 
@@ -249,6 +248,5 @@ std::string str_trim(const std::string &str) {
   return str.substr(start, end - start + 1);
 }
 
-}  // namespace web_server_idf
-}  // namespace esphome
+}  // namespace esphome::web_server_idf
 #endif  // defined(USE_ESP32) && defined(USE_WEBSERVER_OTA)

esphome/components/web_server_idf/multipart.h

@@ -10,8 +10,7 @@
 #include <string>
 #include <utility>
 
-namespace esphome {
-namespace web_server_idf {
+namespace esphome::web_server_idf {
 
 // Wrapper around zorxx/multipart-parser for ESP-IDF OTA uploads
 class MultipartReader {
@@ -81,6 +80,5 @@ bool parse_multipart_boundary(const char *content_type, const char **boundary_st
 // Trim whitespace from both ends of a string
 std::string str_trim(const std::string &str);
 
-}  // namespace web_server_idf
-}  // namespace esphome
+}  // namespace esphome::web_server_idf
 #endif  // defined(USE_ESP32) && defined(USE_WEBSERVER_OTA)

esphome/components/web_server_idf/utils.cpp

@@ -8,8 +8,7 @@
 
 #include "utils.h"
 
-namespace esphome {
-namespace web_server_idf {
+namespace esphome::web_server_idf {
 
 static const char *const TAG = "web_server_idf_utils";
 
@@ -119,6 +118,5 @@ const char *stristr(const char *haystack, const char *needle) {
   return nullptr;
 }
 
-}  // namespace web_server_idf
-}  // namespace esphome
+}  // namespace esphome::web_server_idf
 #endif  // USE_ESP32

esphome/components/web_server_idf/utils.h

@@ -5,8 +5,7 @@
 #include <string>
 #include "esphome/core/helpers.h"
 
-namespace esphome {
-namespace web_server_idf {
+namespace esphome::web_server_idf {
 
 /// Decode URL-encoded string in-place (e.g., %20 -> space, + -> space)
 /// Returns the new length of the decoded string
@@ -29,6 +28,5 @@ bool str_ncmp_ci(const char *s1, const char *s2, size_t n);
 // Case-insensitive string search (like strstr but case-insensitive)
 const char *stristr(const char *haystack, const char *needle);
 
-}  // namespace web_server_idf
-}  // namespace esphome
+}  // namespace esphome::web_server_idf
 #endif  // USE_ESP32

esphome/components/web_server_idf/web_server_idf.cpp

@@ -30,8 +30,7 @@
 #include <cerrno>
 #include <sys/socket.h>
 
-namespace esphome {
-namespace web_server_idf {
+namespace esphome::web_server_idf {
 
 #ifndef HTTPD_409
 #define HTTPD_409 "409 Conflict"
@@ -897,7 +896,6 @@ esp_err_t AsyncWebServer::handle_multipart_upload_(httpd_req_t *r, const char *c
 }
 #endif  // USE_WEBSERVER_OTA
 
-}  // namespace web_server_idf
-}  // namespace esphome
+}  // namespace esphome::web_server_idf
 
 #endif  // !defined(USE_ESP32)