From efc7278fb065d873eca54563c5b89f2768237564 Mon Sep 17 00:00:00 2001
From: Markus Mittendrein <maxmitti@maxmitti.tk>
Date: Tue, 11 Jan 2022 03:20:17 +0100
Subject: Add ' flag for strings to quote and escape them

---
 include/cxxformat/formatters.hpp | 43 +++++++++++++++++++++++++++++++++++++---
 main.cpp                         |  3 +++
 2 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/include/cxxformat/formatters.hpp b/include/cxxformat/formatters.hpp
index b9d6fcc..31f0fef 100644
--- a/include/cxxformat/formatters.hpp
+++ b/include/cxxformat/formatters.hpp
@@ -590,7 +590,46 @@ namespace format {
 				val = val.substr(0, *precision);
 			}
 
-			formatPadded(out, val, ' ', spec.flags.leftJustified, minWidth);
+			if (spec.flags.quote)
+			{
+				const auto quoteExtra = std::count_if(val.begin(), val.end(), "\"\\"_contains) + 2;
+				std::size_t padding = 0;
+				if (minWidth)
+				{
+					const auto totalLength = val.size() + quoteExtra;
+					if (*minWidth > totalLength)
+					{
+						padding = *minWidth - totalLength;
+					}
+				}
+				if (!spec.flags.leftJustified)
+				{
+					out(' ', padding);
+				}
+
+				out('"');
+				for (std::size_t pos = 0, startPos = 0; pos < val.size(); )
+				{
+					pos = val.find_first_of("\"\\", pos);
+					out(val.substr(startPos, pos - startPos));
+					if (pos != std::string_view::npos)
+					{
+						out('\\');
+						startPos = pos;
+						++pos;
+					}
+				}
+				out('"');
+
+				if (spec.flags.leftJustified)
+				{
+					out(' ', padding);
+				}
+			}
+			else
+			{
+				formatPadded(out, val, ' ', spec.flags.leftJustified, minWidth);
+			}
 		}
 
 		static constexpr void conversionSupported(format_specifier spec)
@@ -599,7 +638,6 @@ namespace format {
 			noAlternative(spec.flags.alternative, "stringy types");
 			noSignFlags(spec.addSign, "stringy types");
 			noZeroPadding(spec.padding, "stringy types");
-			noQuote(spec.flags.quote, "stringy types");
 		}
 	};
 
@@ -677,7 +715,6 @@ namespace format {
 			noAlternative(spec.flags.alternative, "char pointer");
 			noSignFlags(spec.addSign, "char pointer");
 			noZeroPadding(spec.padding, "char pointer");
-			noQuote(spec.flags.quote, "char pointer");
 		}
 	};
 
diff --git a/main.cpp b/main.cpp
index 91b5aa1..849face 100644
--- a/main.cpp
+++ b/main.cpp
@@ -30,6 +30,9 @@ int main(int argc, char* argv[])
 	format_to("Hallo %%du %1$s %s%c %s %u = %4$#x = %4$#X = %4$#o %f!\n", std::cout, "Knirp", 's', argv[0], 42u, 1.337);
 	assert(format("Hallo %%du %1$s %s%c %s %u = %4$#x = %4$#X = %4$#o %f!\n", "Knirp", 's', argv[0], 42u, 1.337) == "Hallo %%du %1$s %s%c %s %u = %4$#x = %4$#X = %4$#o %f!\n"_format("Knirp", 's', argv[0], 42u, 1.337));
 
+	"-%20s-\n"_format_to(stdout, "Hallo");
+	"-%'20s-\n"_format_to(stdout, R"(H\"all"o)");
+	"-%'-20s-\n"_format_to(stdout, R"(H\"all"o)");
 	"-%6s--%6s--%6u--%6u-\n"_format_to(stdout, true, false, true, false);
 	"-%'030f-\n"_format_to(stdout, 1'000'000.337);
 	"-%'030a-\n"_format_to(stdout, 1'000'000.337);
-- 
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