Implemented automatic parameter documentation

Hazelnupp/DataType.h

@@ -1,4 +1,5 @@
 #pragma once
+#include <string>
 
 namespace Hazelnp
 {
@@ -12,4 +13,27 @@ namespace Hazelnp
 		STRING,
 		LIST
 	};
+
+	static inline std::string DataTypeToString(DATA_TYPE type)
+	{
+		switch (type)
+		{
+		case DATA_TYPE::VOID:
+			return "VOID";
+
+		case DATA_TYPE::INT:
+			return "INT";
+
+		case DATA_TYPE::FLOAT:
+			return "FLOAT";
+
+		case DATA_TYPE::STRING:
+			return "STRING";
+
+		case DATA_TYPE::LIST:
+			return "LIST";
+		}
+
+		return "";
+	}
 }

Hazelnupp/Hazelnupp.cpp

@@ -60,12 +60,15 @@ void Hazelnupp::Parse(const int argc, const char* const* argv)
 
 		// Apply constraints such as default values, and required parameters.
 		// Types have already been enforced.
-		ApplyConstraints();
+		// Dont apply constraints when we are just printind the param docs
+		if ((!catchHelp) || (!HasParam("--help")))
+			ApplyConstraints();
 	}
 	catch (const HazelnuppConstraintTypeMissmatch& hctm)
 	{
 		if (crashOnFail)
 		{
+			std::cout << GenerateDocumentation() << std::endl;
 			std::cerr << "Fatal error: Command-line parameter value-type mismatch at \"" << hctm.What() << "\"!";
 			quick_exit(-1009);
 		}
@@ -76,6 +79,7 @@ void Hazelnupp::Parse(const int argc, const char* const* argv)
 	{
 		if (crashOnFail)
 		{
+			std::cout << GenerateDocumentation() << std::endl;
 			std::cerr << "Fatal error: Missing required command-line parameter \"" << hctm.What() << "\"!";
 			quick_exit(-1010);
 		}
@@ -83,6 +87,13 @@ void Hazelnupp::Parse(const int argc, const char* const* argv)
 			throw hctm; // yeet
 	}
 
+	// Catch --help parameter
+	if ((catchHelp) && (HasParam("--help")))
+	{
+		std::cout << GenerateDocumentation() << std::endl;
+		quick_exit(0);
+	}
+
 	return;
 }
 
@@ -281,6 +292,162 @@ bool Hazelnupp::GetCrashOnFail() const
 	return crashOnFail;
 }
 
+void Hazelnupp::SetCatchHelp(bool catchHelp)
+{
+	this->catchHelp = catchHelp;
+	return;
+}
+
+bool Hazelnupp::GetCatchHelp() const
+{
+	return catchHelp;
+}
+
+void Hazelnupp::SetBriefDescription(const std::string& description)
+{
+	briefDescription = description;
+	return;
+}
+
+const std::string& Hazelnupp::GetBriefDescription()
+{
+	return briefDescription;
+}
+
+void Hazelnp::Hazelnupp::RegisterDescription(const std::string& parameter, const std::string& description)
+{
+	parameterDescriptions[parameter] = description;
+	return;
+}
+
+const std::string Hazelnp::Hazelnupp::GetDescription(const std::string& parameter) const
+{
+	// Do we already have a description for this parameter?
+	const auto par = parameterDescriptions.find(parameter);
+	if (par == parameterDescriptions.end())
+		// No? Then return ""
+		return "";
+
+	// We do? Then return it
+	return par->second;
+}
+
+void Hazelnp::Hazelnupp::ClearDescription(const std::string& parameter)
+{
+	// This will just do nothing if the entry does not exist
+	parameterDescriptions.erase(parameter);
+	return;
+}
+
+std::string Hazelnupp::GenerateDocumentation() const
+{
+	std::stringstream ss;
+
+	// Add brief, if available
+	if (briefDescription.length() > 0)
+		ss << briefDescription << std::endl;
+
+	// Collect parameter information
+	struct ParamDocEntry
+	{
+		std::string abbreviation;
+		std::string description;
+		std::string type;
+		bool required = false;
+		bool typeIsForced = false;
+		std::string defaultVal;
+	};
+	std::unordered_map<std::string, ParamDocEntry> paramInfos;
+
+	// Collect descriptions
+	for (const auto& it : parameterDescriptions)
+	{
+		// Do we already have that param in the paramInfo set?
+		if (paramInfos.find(it.first) == paramInfos.end())
+			// No? Create it.
+			paramInfos[it.first] = ParamDocEntry();
+
+		paramInfos[it.first].description = it.second;
+	}
+
+	// Collect abbreviations
+	// first value is abbreviation, second is long form
+	for (const auto& it : abbreviations)
+	{
+		// Do we already have that param in the paramInfo set?
+		if (paramInfos.find(it.second) == paramInfos.end())
+			// No? Create it.
+			paramInfos[it.second] = ParamDocEntry();
+
+		paramInfos[it.second].abbreviation = it.first;
+	}
+
+	// Collect constraints
+	for (const auto& it : constraints)
+	{
+		// Do we already have that param in the paramInfo set?
+		if (paramInfos.find(it.first) == paramInfos.end())
+			// No? Create it.
+			paramInfos[it.first] = ParamDocEntry();
+
+		ParamDocEntry& cached = paramInfos[it.first];
+		cached.required = it.second.required;
+		cached.typeIsForced = it.second.constrainType;
+		cached.type = DataTypeToString(it.second.wantedType);
+		
+		std::stringstream defaultValueSs;
+		for (const std::string& s : it.second.defaultValue)
+		{
+			defaultValueSs << '\'' << s << '\'';
+
+			// Add a space if we are not at the last entry
+			if ((void*)&s != (void*)&it.second.defaultValue.back())
+				defaultValueSs << " ";
+		}
+		cached.defaultVal = defaultValueSs.str();
+	}
+
+	// Now generate the documentatino body
+	if (paramInfos.size() > 0)
+	{
+		ss << std::endl 
+			<< "==== AVAILABLE PARAMETERS ====" 
+			<< std::endl << std::endl;
+
+		for (const auto& it : paramInfos)
+		{
+			const ParamDocEntry& pde = it.second;
+
+			// Put name
+			ss << it.first << "   ";
+
+			// Put abbreviation
+			if (pde.abbreviation.length() > 0)
+				ss << pde.abbreviation << "   ";
+
+			// Put type
+			if (pde.typeIsForced)
+				ss << pde.type << "   ";
+
+			// Put default value
+			if (pde.defaultVal.length() > 0)
+				ss << "default=[" << pde.defaultVal << "]   ";
+
+			// Put required tag, but only if no default value
+			if ((pde.required) && (pde.defaultVal.length() == 0))
+				ss << "[[REQUIRED]]    ";
+
+			// Put brief description
+			if (pde.description.length() > 0)
+				ss << pde.description;
+
+			ss << std::endl << std::endl;
+		}
+	}
+
+	return ss.str();
+}
+
 void Hazelnupp::ApplyConstraints()
 {
 	// Enforce required parameters / default values

Hazelnupp/Hazelnupp.h

@@ -54,6 +54,32 @@ namespace Hazelnp
 		//! Gets whether the application crashes on an exception whilst parsing, and prints to stderr.
 		bool GetCrashOnFail() const;
 
+		//! Sets whether the Hazelnupp should automatically catch the --help parameter, print the parameter documentation to stdout, and exit or not.
+		void SetCatchHelp(bool catchHelp);
+
+		//! Retruns whether the Hazelnupp should automatically catch the --help parameter, print the parameter documentation to stdout, and exit or not.
+		bool GetCatchHelp() const;
+
+		//! Sets a brief description of the application to be automatically added to the documentation.
+		void SetBriefDescription(const std::string& description);
+
+		//! Returns the brief description of the application to be automatically added to the documentation.
+		const std::string& GetBriefDescription();
+
+		//! Willl register a short description for a parameter.  
+		//! Will overwrite existing descriptions for that parameter.
+		void RegisterDescription(const std::string& parameter, const std::string& description);
+
+		//! Will return a short description for a parameter, if it exists.  
+		//! Empty string if it does not exist.
+		const std::string GetDescription(const std::string& parameter) const;
+
+		//! Will delete the description of a parameter if it exists.
+		void ClearDescription(const std::string& parameter);
+
+		//! Will generate a text-based documentation suited to show the user, for example on --help.
+		std::string GenerateDocumentation() const;
+
 	private:
 		//! Will translate the c-like args to an std::vector
 		void PopulateRawArgs(const int argc, const char* const* argv);
@@ -76,14 +102,24 @@ namespace Hazelnp
 		std::string executableName; //! The path of the executable. Always argv[0]
 		std::unordered_map<std::string, Parameter*> parameters;
 
-		// These are abbreviations. Like, -f for --force.
+		//! These are abbreviations. Like, -f for --force.
 		std::unordered_map<std::string, std::string> abbreviations;
 
-		// Parameter constraints, mapped to keys
+		//! Parameter constraints, mapped to keys
 		std::unordered_map<std::string, ParamConstraint> constraints;
 
+		//! Raw argv
 		std::vector<std::string> rawArgs;
 
+		//! Short descriptions for parameters
+		std::unordered_map<std::string, std::string> parameterDescriptions;
+
+		//! A brief description of the application to be added to the generated documentation. Optional.
+		std::string briefDescription;
+
+		//! If set to true, Hazelnupp will automatically catch the --help parameter, print the parameter documentation to stdout and exit.
+		bool catchHelp = true;
+
 		//! If set to true, Hazelnupp will crash the application with output to stderr when an exception is thrown whilst parsing.
 		bool crashOnFail = true;
 	};

Hazelnupp/Hazelnupp.vcxproj

@@ -27,26 +27,26 @@
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <PlatformToolset>v142</PlatformToolset>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <PlatformToolset>v142</PlatformToolset>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <PlatformToolset>v142</PlatformToolset>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <PlatformToolset>v142</PlatformToolset>
     <WholeProgramOptimization>true</WholeProgramOptimization>