First pass at automatic document generation.

scripts/build.mk

@@ -9,4 +9,3 @@ $(OBJDIR)/scripts/protoencode_%.o: scripts/protoencode.cc
 $(call use-library, $(OBJDIR)/protoencode_ConfigProto.exe, $(OBJDIR)/scripts/protoencode_ConfigProto.o, PROTO)
 $(call use-library, $(OBJDIR)/protoencode_TestProto.exe, $(OBJDIR)/scripts/protoencode_TestProto.o, PROTO)
 
-

scripts/mkdoc.cc

@@ -0,0 +1,55 @@
+#include "lib/globals.h"
+#include "lib/proto.h"
+#include "lib/flags.h"
+#include <fmt/format.h>
+
+extern const std::map<std::string, std::string> formats;
+
+static ConfigProto findConfig(std::string name)
+{
+    const auto data = formats.at(name);
+    ConfigProto config;
+    if (!config.ParseFromString(data))
+        Error() << "bad config name: " + name;
+    return config;
+}
+
+int main(int argc, const char* argv[])
+{
+	auto config = findConfig(argv[1]);
+
+	fmt::print("# {}\n\n", config.comment());
+
+	const auto& documentation = config.documentation();
+	auto it = documentation.begin();
+	if (it != documentation.end())
+	{
+		fmt::print("{}\n", *it++);
+
+		fmt::print("## Options\n\n");
+
+		if (!config.option().empty() && !config.option_group().empty())
+		{
+			for (const auto& option_group : config.option_group())
+			{
+				fmt::print("  - {}:\n", option_group.comment());
+				for (const auto& option : option_group.option())
+					fmt::print("      - `{}`: {}\n", option.name(), option.comment());
+			}
+
+			for (const auto& option : config.option())
+				fmt::print("  - `{}`: {}\n", option.name(), option.comment());
+		}
+		else
+			fmt::print("(no options)\n");
+		fmt::print("\n");
+
+		while (it != documentation.end())
+			fmt::print("{}\n", *it++);
+	}
+	else
+		fmt::print("(This format has no documentation. Please file a bug.)\n");
+
+	return 0;
+}
+

scripts/protoencode.cc

@@ -98,7 +98,7 @@ int main(int argc, const char* argv[])
 					if (!u)
 						break;
 
-					ss << fmt::format("\\u000{:02x}", u);
+					ss << fmt::format("\\u{:04x}", u);
 				}
 				ss << "\\n\"\n";
 			}