Added padding support and set_pattern to custom_flags

example/example.cpp

@@ -277,7 +277,7 @@ void custom_flags_example()
 {    
     
     using spdlog::details::make_unique; // for pre c++14   
-    auto formatter = make_unique<spdlog::pattern_formatter>("[%+] [%*]");
+    auto formatter = make_unique<spdlog::pattern_formatter>();
-    formatter->add_flag<my_formatter_flag>('*').recompile();    
+    formatter->add_flag<my_formatter_flag>('*').set_pattern("[%n] [%*] [%^%l%$] %v");    
     spdlog::set_formatter(std::move(formatter));    
 }

include/spdlog/pattern_formatter-inl.h

@@ -1024,8 +1024,9 @@ SPDLOG_INLINE void pattern_formatter::format(const details::log_msg &msg, memory
     details::fmt_helper::append_string_view(eol_, dest);
 }
 
-SPDLOG_INLINE void pattern_formatter::recompile()
+SPDLOG_INLINE void pattern_formatter::set_pattern(std::string pattern)
 {
+    pattern_ = std::move(pattern);
     compile_pattern_(pattern_);
 }
 
@@ -1041,15 +1042,19 @@ SPDLOG_INLINE std::tm pattern_formatter::get_time_(const details::log_msg &msg)
 template<typename Padder>
 SPDLOG_INLINE void pattern_formatter::handle_flag_(char flag, details::padding_info padding)
 {
+    // process custom flags
     auto it = custom_handlers_.find(flag);
     if (it != custom_handlers_.end()) 
     {
-        formatters_.push_back(it->second->clone());
+        auto custom_handler = it->second->clone();
+        custom_handler->set_padding_info(padding);
+        formatters_.push_back(std::move(custom_handler));
         return;
     }
+
+    // process built-in flags
     switch (flag) 
     {
-
     case ('+'): // default formatter
         formatters_.push_back(details::make_unique<details::full_formatter>(padding));
         break;

include/spdlog/pattern_formatter.h

@@ -41,8 +41,8 @@ struct padding_info
     {
         return enabled_;
     }
-    const size_t width_ = 0;
+    size_t width_ = 0;
-    const pad_side side_ = left;
+    pad_side side_ = left;
     bool truncate_ = false;
     bool enabled_ = false;
 };
@@ -67,6 +67,11 @@ class SPDLOG_API custom_flag_formatter : public details::flag_formatter
 {
 public:
     virtual std::unique_ptr<custom_flag_formatter> clone() const = 0;
+
+    void set_padding_info(details::padding_info padding)
+    {
+        flag_formatter::padinfo_ = padding;
+    }
 };
 
 class SPDLOG_API pattern_formatter final : public formatter
@@ -92,7 +97,7 @@ public:
         custom_handlers_[flag] = details::make_unique<T>(args...);
         return *this;
     }
-    void recompile();
+    void set_pattern(std::string pattern);
 
 private:
     std::string pattern_;

tests/test_pattern_formatter.cpp

@@ -246,8 +246,6 @@ TEST_CASE("paddinng_truncate_funcname", "[pattern_formatter]")
     REQUIRE(lines[1] == "message [funct]");
 }
 
-
-
 TEST_CASE("clone-default-formatter", "[pattern_formatter]")
 {
     auto formatter_1 = std::make_shared<spdlog::pattern_formatter>();
@@ -307,17 +305,26 @@ TEST_CASE("clone-formatter-2", "[pattern_formatter]")
     REQUIRE(fmt::to_string(formatted_1) == fmt::to_string(formatted_2));
 }
 
-
 class custom_test_flag : public spdlog::custom_flag_formatter
 {
 public:
-    class custom_test_flag (std::string txt) : some_txt{std::move(txt)}
+    class custom_test_flag(std::string txt)
+        : some_txt{std::move(txt)}
     {}
 
     void format(const spdlog::details::log_msg &, const std::tm &, spdlog::memory_buf_t &dest) override
     {
+        if (some_txt == "throw_me")
+        {
+            throw spdlog::spdlog_ex("custom_flag_exception_test");
+        }
+        some_txt = std::string(padinfo_.width_, ' ') + some_txt;        
         dest.append(some_txt.data(), some_txt.data() + some_txt.size());
     }
+    spdlog::details::padding_info get_padding_info()
+    {
+        return padinfo_;
+    }
 
     std::string some_txt;
 
@@ -329,8 +336,9 @@ public:
 // test clone with custom flag formatters
 TEST_CASE("clone-custom_formatter", "[pattern_formatter]")
 {
-    auto formatter_1 = std::make_shared<spdlog::pattern_formatter>("[%n] [%t] %v", spdlog::pattern_time_type::utc, "");
+
-    formatter_1->add_flag<custom_test_flag>('t', "custom_output").recompile();    
+    auto formatter_1 = std::make_shared<spdlog::pattern_formatter>();
+    formatter_1->add_flag<custom_test_flag>('t', "custom_output").set_pattern("[%n] [%t] %v");
     auto formatter_2 = formatter_1->clone();
     std::string logger_name = "logger-name";
     spdlog::details::log_msg msg(logger_name, spdlog::level::info, "some message");
@@ -340,8 +348,9 @@ TEST_CASE("clone-custom_formatter", "[pattern_formatter]")
     formatter_1->format(msg, formatted_1);
     formatter_2->format(msg, formatted_2);
 
-    REQUIRE(fmt::to_string(formatted_1) == "[logger-name] [custom_output] some message");
+    auto expected = fmt::format("[logger-name] [custom_output] some message{}", spdlog::details::os::default_eol);
-    REQUIRE(fmt::to_string(formatted_2) == "[logger-name] [custom_output] some message");
+    REQUIRE(fmt::to_string(formatted_1) == expected);
+    REQUIRE(fmt::to_string(formatted_2) == expected);
 }
 
 //
@@ -398,15 +407,38 @@ TEST_CASE("full filename formatter", "[pattern_formatter]")
     REQUIRE(fmt::to_string(formatted) == test_path);
 }
 
-
 TEST_CASE("custom flags", "[pattern_formatter]")
 {
-    auto formatter = std::make_shared<spdlog::pattern_formatter>("[%n] [%t] [%u] %v", spdlog::pattern_time_type::utc, "");
+    auto formatter = std::make_shared<spdlog::pattern_formatter>();
-    formatter->add_flag<custom_test_flag>('t', "custom1").add_flag<custom_test_flag>('u', "custom2").recompile();
+    formatter->add_flag<custom_test_flag>('t', "custom1").add_flag<custom_test_flag>('u', "custom2").set_pattern("[%n] [%t] [%u] %v");
+
+    memory_buf_t formatted;
+
+    spdlog::details::log_msg msg(spdlog::source_loc{}, "logger-name", spdlog::level::info, "some message");
+    formatter->format(msg, formatted);
+    auto expected = fmt::format("[logger-name] [custom1] [custom2] some message{}", spdlog::details::os::default_eol);
+    REQUIRE(fmt::to_string(formatted) == expected);
+}
+
+TEST_CASE("custom flags-padding", "[pattern_formatter]")
+{
+    auto formatter = std::make_shared<spdlog::pattern_formatter>();
+    formatter->add_flag<custom_test_flag>('t', "custom1").add_flag<custom_test_flag>('u', "custom2").set_pattern("[%n] [%t] [%5u] %v");
 
     memory_buf_t formatted;
 
     spdlog::details::log_msg msg(spdlog::source_loc{}, "logger-name", spdlog::level::info, "some message");
     formatter->format(msg, formatted);
-    REQUIRE(fmt::to_string(formatted) == "[logger-name] [custom1] [custom2] some message");    
+    auto expected = fmt::format("[logger-name] [custom1] [     custom2] some message{}", spdlog::details::os::default_eol);
+    REQUIRE(fmt::to_string(formatted) == expected);
+}
+
+TEST_CASE("custom flags-exception", "[pattern_formatter]")
+{
+    auto formatter = std::make_shared<spdlog::pattern_formatter>();
+    formatter->add_flag<custom_test_flag>('t', "throw_me").add_flag<custom_test_flag>('u', "custom2").set_pattern("[%n] [%t] [%u] %v");
+
+    memory_buf_t formatted;
+    spdlog::details::log_msg msg(spdlog::source_loc{}, "logger-name", spdlog::level::info, "some message");
+    CHECK_THROWS_AS(formatter->format(msg, formatted), spdlog::spdlog_ex);
 }