From 4a7e3121e15dede49c8ae7704c579bc979464da7 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Fri, 9 Dec 2016 18:49:24 +0000
Subject: Macro helper for easily adding new formatters that take a single
 character parameter from the format string

---
 libadhocutil/compileTimeFormatter.h                |  5 ++++
 .../unittests/testCompileTimeFormatter.cpp         | 31 ++++++++++++++++++++--
 2 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/libadhocutil/compileTimeFormatter.h b/libadhocutil/compileTimeFormatter.h
index 501e0a7..034a65d 100644
--- a/libadhocutil/compileTimeFormatter.h
+++ b/libadhocutil/compileTimeFormatter.h
@@ -84,6 +84,11 @@ namespace AdHoc {
 	struct StreamWriter<S, start, stream, '%', C, sn...> : \
 		public StreamWriterBase<S, start, BOOST_PP_VARIADIC_SIZE(C) + 1, stream, sn...>
 
+#define StreamWriterTP(P, C...) \
+	template<const char * const & S, int start, typename stream, char P, char ... sn> \
+	struct StreamWriter<S, start, stream, '%', C, sn...> : \
+		public StreamWriterBase<S, start, BOOST_PP_VARIADIC_SIZE(C) + 1, stream, sn...>
+
 	// Default stream writer formatter
 	StreamWriterT('?') {
 		template<typename P, typename ... Pn>
diff --git a/libadhocutil/unittests/testCompileTimeFormatter.cpp b/libadhocutil/unittests/testCompileTimeFormatter.cpp
index 7ecd50e..9b678ec 100644
--- a/libadhocutil/unittests/testCompileTimeFormatter.cpp
+++ b/libadhocutil/unittests/testCompileTimeFormatter.cpp
@@ -12,11 +12,12 @@ extern constexpr const char * formatEdgeCaseSingle = "1";
 extern constexpr const char * formatEdgeCaseFormatStart = "%? after";
 extern constexpr const char * formatEdgeCaseFormatEnd = "before %?";
 extern constexpr const char * formatEdgeCaseFormatLonely = "%?";
-
 extern constexpr const char * formatStringLiteral = "literal";
 extern constexpr const char * formatStringSingle = "single %?.";
 extern constexpr const char * formatStringMulti = "First %?, then %?.";
 extern constexpr const char * formatStringCustom = "custom %()";
+extern constexpr const char * formatStringCustomParam1 = "custom %(\x3)";
+extern constexpr const char * formatStringCustomParam2 = "custom %(\x9)";
 extern constexpr const char * formatStringCustomLong = "custom %(longname)";
 extern constexpr const char * formatStringLong = "                                                                                                                                                                                                                                                      ";
 extern constexpr const char * formatStringMultiArg = "value%ra";
@@ -26,7 +27,8 @@ extern constexpr const char * formatStringEscape3 = "literal %%%? percentage.";
 extern constexpr const char * formatStringEscape4 = "literal %%%?%% percentage.";
 
 namespace AdHoc {
-	// Custom stream writer formatter, formats as (bracketed expression)
+	// Custom stream writer formatter, formats as
+	// -( bracketed expression )-
 	StreamWriterT('(', ')') {
 		template<typename P, typename ... Pn>
 		static void write(stream & s, const P & p, const Pn & ... pn)
@@ -35,6 +37,8 @@ namespace AdHoc {
 			StreamWriter::next(s, pn...);
 		}
 	};
+	// Custom stream writer formatter with a long identifier, formats as
+	// ---( bracketed expression )---
 	StreamWriterT('(', 'l', 'o', 'n', 'g', 'n', 'a', 'm', 'e', ')') {
 		template<typename P, typename ... Pn>
 		static void write(stream & s, const P & p, const Pn & ... pn)
@@ -43,6 +47,17 @@ namespace AdHoc {
 			StreamWriter::next(s, pn...);
 		}
 	};
+	// Custom stream writer formatter that has parameter in the format string, formats as
+	// dashes*-( bracketed expression )dashes*-
+	StreamWriterTP(dashes, '(', dashes, ')') {
+		template<typename P, typename ... Pn>
+		static void write(stream & s, const P & p, const Pn & ... pn)
+		{
+			std::string d(dashes, '-');
+			s << d << "( " << p << " )" << d;
+			StreamWriter::next(s, pn...);
+		}
+	};
 	// Custom stream writer formatter, formats
 	//            right-aligned by given width
 	StreamWriterT('r', 'a') {
@@ -157,6 +172,18 @@ BOOST_AUTO_TEST_CASE ( customLongName )
 	BOOST_REQUIRE_EQUAL(this->str(), "custom ---( some text here )---");
 }
 
+BOOST_AUTO_TEST_CASE ( customParam1 )
+{
+	Formatter<formatStringCustomParam1>::write(*this, "some text here");
+	BOOST_REQUIRE_EQUAL(this->str(), "custom ---( some text here )---");
+}
+
+BOOST_AUTO_TEST_CASE ( customParam2 )
+{
+	Formatter<formatStringCustomParam2>::write(*this, "some text here");
+	BOOST_REQUIRE_EQUAL(this->str(), "custom ---------( some text here )---------");
+}
+
 typedef Formatter<formatStringCustom> TestFormat;
 BOOST_AUTO_TEST_CASE ( typedefFormat )
 {
-- 
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