switch back to boost::filesystem to avoid the requirement of c++17

examples/book_client/book_client.cc

@@ -2,12 +2,16 @@
 
 #include <iostream>
 
+#include "boost/filesystem/operations.hpp"
+
 #include "json/json.h"
 
 #include "webcc/string.h"
 
 #include "book_json.h"
 
+namespace bfs = boost::filesystem;
+
 BookClient::BookClient(const std::string& url, int timeout)
     : url_(url), session_(timeout) {
   // Default Content-Type for requests with a body.
@@ -124,8 +128,7 @@ bool BookClient::Delete(const std::string& id) {
   }
 }
 
-bool BookClient::GetPhoto(const std::string& id,
-                          const std::filesystem::path& path) {
+bool BookClient::GetPhoto(const std::string& id, const bfs::path& path) {
   try {
     auto r = session_.Send(WEBCC_GET(url_).
                            Path("books").Path(id).Path("photo")(),
@@ -145,8 +148,7 @@ bool BookClient::GetPhoto(const std::string& id,
   }
 }
 
-bool BookClient::SetPhoto(const std::string& id,
-                          const std::filesystem::path& path) {
+bool BookClient::SetPhoto(const std::string& id, const bfs::path& path) {
   try {
     if (!CheckPhoto(path)) {
       return false;
@@ -168,13 +170,12 @@ bool BookClient::SetPhoto(const std::string& id,
   }
 }
 
-bool BookClient::CheckPhoto(const std::filesystem::path& photo) {
+bool BookClient::CheckPhoto(const bfs::path& photo) {
   if (photo.empty()) {
     return false;
   }
 
-  if (!std::filesystem::is_regular_file(photo) ||
-      !std::filesystem::exists(photo)) {
+  if (!bfs::is_regular_file(photo) || !bfs::exists(photo)) {
     return false;
   }
 

examples/book_client/book_client.h

@@ -1,10 +1,11 @@
 #ifndef BOOK_CLIENT_H_
 #define BOOK_CLIENT_H_
 
-#include <filesystem>
 #include <list>
 #include <string>
 
+#include "boost/filesystem/path.hpp"
+
 #include "json/json-forwards.h"
 
 #include "webcc/client_session.h"
@@ -28,13 +29,13 @@ public:
   bool Delete(const std::string& id);
 
   // Get photo, save to the given path.
-  bool GetPhoto(const std::string& id, const std::filesystem::path& path);
+  bool GetPhoto(const std::string& id, const boost::filesystem::path& path);
 
   // Set photo using the file of the given path.
-  bool SetPhoto(const std::string& id, const std::filesystem::path& path);
+  bool SetPhoto(const std::string& id, const boost::filesystem::path& path);
 
 private:
-  bool CheckPhoto(const std::filesystem::path& photo);
+  bool CheckPhoto(const boost::filesystem::path& photo);
 
   // Check HTTP response status.
   bool CheckStatus(webcc::ResponsePtr response, int expected_status);

examples/book_client/main.cc

@@ -1,10 +1,13 @@
-#include <filesystem>
 #include <iostream>
 
+#include "boost/filesystem/operations.hpp"
+
 #include "webcc/logger.h"
 
 #include "book_client.h"
 
+namespace bfs = boost::filesystem;
+
 // -----------------------------------------------------------------------------
 
 void PrintSeparator() {
@@ -36,9 +39,8 @@ int main(int argc, char* argv[]) {
 
   std::string url = argv[1];
 
-  std::filesystem::path photo_dir = argv[2];
-  if (!std::filesystem::is_directory(photo_dir) ||
-      !std::filesystem::exists(photo_dir)) {
+  bfs::path photo_dir = argv[2];
+  if (!bfs::is_directory(photo_dir) || !bfs::exists(photo_dir)) {
     std::cerr << "Invalid photo dir!" << std::endl;
     return 1;
   }