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

examples/book_server/main.cc

@@ -1,11 +1,14 @@
-#include <filesystem>
 #include <iostream>
 
+#include "boost/filesystem/operations.hpp"
+
 #include "webcc/logger.h"
 #include "webcc/server.h"
 
 #include "views.h"
 
+namespace bfs = boost::filesystem;
+
 int main(int argc, char* argv[]) {
   if (argc < 3) {
     std::cout << "usage: book_server <port> <upload_dir>" << std::endl;
@@ -18,17 +21,16 @@ int main(int argc, char* argv[]) {
 
   std::uint16_t port = static_cast<std::uint16_t>(std::atoi(argv[1]));
 
-  std::filesystem::path upload_dir = argv[2];
-  if (!std::filesystem::is_directory(upload_dir) ||
-      !std::filesystem::exists(upload_dir)) {
+  bfs::path upload_dir = argv[2];
+  if (!bfs::is_directory(upload_dir) || !bfs::exists(upload_dir)) {
     std::cerr << "Invalid upload dir!" << std::endl;
     return 1;
   }
 
   // Add a sub-dir for book photos.
-  std::filesystem::path photo_dir = upload_dir / "books";
-  if (!std::filesystem::exists(photo_dir)) {
-    std::filesystem::create_directory(photo_dir);
+  bfs::path photo_dir = upload_dir / "books";
+  if (!bfs::exists(photo_dir)) {
+    bfs::create_directory(photo_dir);
   }
 
   std::cout << "Book photos will be saved to: " << photo_dir << std::endl;

examples/book_server/views.cc

@@ -1,5 +1,7 @@
 #include "views.h"
 
+#include "boost/filesystem/operations.hpp"
+
 #include "json/json.h"
 
 #include "webcc/response_builder.h"
@@ -8,6 +10,8 @@
 #include "book_db.h"
 #include "book_json.h"
 
+namespace bfs = boost::filesystem;
+
 // -----------------------------------------------------------------------------
 
 static BookDB g_book_db;
@@ -53,7 +57,7 @@ webcc::ResponsePtr BookListView::Post(webcc::RequestPtr request) {
 
 // -----------------------------------------------------------------------------
 
-BookDetailView::BookDetailView(std::filesystem::path photo_dir)
+BookDetailView::BookDetailView(bfs::path photo_dir)
     : photo_dir_(std::move(photo_dir)) {
 }
 
@@ -121,8 +125,8 @@ webcc::ResponsePtr BookDetailView::Delete(webcc::RequestPtr request) {
 
   // Delete the photo from file system.
   if (!photo_name.empty()) {
-    std::error_code ec;
-    std::filesystem::remove(photo_dir_ / photo_name, ec);
+    boost::system::error_code ec;
+    bfs::remove(photo_dir_ / photo_name, ec);
   }
 
   return webcc::ResponseBuilder{}.OK()();
@@ -130,7 +134,7 @@ webcc::ResponsePtr BookDetailView::Delete(webcc::RequestPtr request) {
 
 // -----------------------------------------------------------------------------
 
-BookPhotoView::BookPhotoView(std::filesystem::path photo_dir)
+BookPhotoView::BookPhotoView(bfs::path photo_dir)
     : photo_dir_(std::move(photo_dir)) {
 }
 
@@ -160,8 +164,8 @@ webcc::ResponsePtr BookPhotoView::Get(webcc::RequestPtr request) {
     return webcc::ResponseBuilder{}.NotFound()();
   }
 
-  std::filesystem::path photo_path = photo_dir_ / book.photo;
-  if (!std::filesystem::exists(photo_path)) {
+  bfs::path photo_path = photo_dir_ / book.photo;
+  if (!bfs::exists(photo_path)) {
     return webcc::ResponseBuilder{}.NotFound()();
   }
 
@@ -215,8 +219,8 @@ webcc::ResponsePtr BookPhotoView::Delete(webcc::RequestPtr request) {
   }
 
   // Error handling is simplified.
-  std::error_code ec;
-  std::filesystem::remove(photo_dir_ / book.photo, ec);
+  boost::system::error_code ec;
+  bfs::remove(photo_dir_ / book.photo, ec);
 
   return webcc::ResponseBuilder{}.OK()();
 }

examples/book_server/views.h

@@ -1,7 +1,7 @@
 #ifndef VIEWS_H_
 #define VIEWS_H_
 
-#include <filesystem>
+#include "boost/filesystem/path.hpp"
 
 #include "webcc/view.h"
 
@@ -25,7 +25,7 @@ private:
 // URL: /books/{id}
 class BookDetailView : public webcc::View {
 public:
-  explicit BookDetailView(std::filesystem::path photo_dir);
+  explicit BookDetailView(boost::filesystem::path photo_dir);
 
   webcc::ResponsePtr Handle(webcc::RequestPtr request) override;
 
@@ -40,7 +40,7 @@ private:
   webcc::ResponsePtr Delete(webcc::RequestPtr request);
 
 private:
-  std::filesystem::path photo_dir_;
+  boost::filesystem::path photo_dir_;
 };
 
 // -----------------------------------------------------------------------------
@@ -48,7 +48,7 @@ private:
 // URL: /books/{id}/photo
 class BookPhotoView : public webcc::View {
 public:
-  explicit BookPhotoView(std::filesystem::path photo_dir);
+  explicit BookPhotoView(boost::filesystem::path photo_dir);
 
   webcc::ResponsePtr Handle(webcc::RequestPtr request) override;
 
@@ -68,7 +68,7 @@ private:
   webcc::ResponsePtr Delete(webcc::RequestPtr request);
 
 private:
-  std::filesystem::path photo_dir_;
+  boost::filesystem::path photo_dir_;
 };
 
 #endif  // VIEWS_H_