fix path when roll files (#518)

include/ylt/easylog/appender.hpp

@@ -22,6 +22,7 @@
 #include <shared_mutex>
 #include <string>
 #include <string_view>
+#include <system_error>
 
 #include "record.hpp"
 #include "ylt/util/concurrentqueue.h"
@@ -303,6 +304,17 @@ class appender {
   void open_log_file() {
     file_size_ = 0;
     std::string filename = build_filename();
+
+    if (std::filesystem::path(filename).has_parent_path()) {
+      std::error_code ec;
+      auto parant_path = std::filesystem::path(filename).parent_path();
+      std::filesystem::create_directories(parant_path, ec);
+      if (ec) {
+        std::cout << "create directories error: " << ec.message() << std::flush;
+        abort();
+      }
+    }
+
     file_.open(filename, std::ios::binary | std::ios::out | std::ios::app);
     if (file_) {
       std::error_code ec;
@@ -338,6 +350,10 @@ class appender {
       filename.append(file_path.extension().string());
     }
 
+    if (std::filesystem::path(file_path).has_parent_path()) {
+      return file_path.parent_path().append(filename).string();
+    }
+
     return filename;
   }
 

src/easylog/tests/test_easylog.cpp

@@ -132,6 +132,27 @@ TEST_CASE("test basic") {
         std::string::npos);
 }
 
+TEST_CASE("test roll files and automatic create directories") {
+  std::string filename = "a/b/c/test.txt";
+  std::filesystem::remove(filename);
+  CHECK(!std::filesystem::exists(filename));
+  constexpr size_t InstanceId = 888;
+  easylog::init_log<InstanceId>(Severity::DEBUG, filename, false, true, 20, 3,
+                                true);
+  CHECK(std::filesystem::exists(filename));
+  MELOG_INFO(InstanceId) << 42 << " " << 4.5 << 'a' << " it is a test";
+  MELOG_INFO(InstanceId) << 42 << " " << 4.5 << 'a' << " it is a test";
+  MELOG_INFO(InstanceId) << 42 << " " << 4.5 << 'a' << " it is a test";
+
+  CHECK(std::filesystem::exists(filename));
+  CHECK(std::filesystem::exists("a/b/c/test.1.txt"));
+  CHECK(std::filesystem::exists("a/b/c/test.2.txt"));
+
+  std::error_code ec;
+  std::filesystem::remove_all("a", ec);
+  std::cout << ec.message() << "\n";
+}
+
 TEST_CASE("test_severity") {
   // test severity
   std::string severity_filename = "test_severity.txt";