CommandLineInterface: Accept output streams as parameters

solc/CommandLineInterface.cpp

@@ -70,7 +70,6 @@
 	#include <unistd.h>
 #endif
 
-#include <iostream>
 #include <fstream>
 
 #if !defined(STDERR_FILENO)
@@ -86,25 +85,18 @@ using namespace solidity::langutil;
 namespace solidity::frontend
 {
 
-namespace
+ostream& CommandLineInterface::sout(bool _markAsUsed)
 {
-
-static bool g_hasOutput = false;
-
-std::ostream& sout(bool _used = true)
-{
-	if (_used)
-		g_hasOutput = true;
-	return cout;
+	if (_markAsUsed)
+		m_hasOutput = true;
+	return m_sout;
 }
 
-std::ostream& serr(bool _used = true)
+ostream& CommandLineInterface::serr(bool _markAsUsed)
 {
-	if (_used)
-		g_hasOutput = true;
-	return cerr;
-}
-
+	if (_markAsUsed)
+		m_hasOutput = true;
+	return m_serr;
 }
 
 #define cout
@@ -497,11 +489,11 @@ void CommandLineInterface::createJson(string const& _fileName, string const& _js
 
 bool CommandLineInterface::parseArguments(int _argc, char const* const* _argv)
 {
-	CommandLineParser parser(sout(false), serr(false));
+	CommandLineParser parser(sout(/* _markAsUsed */ false), serr(/* _markAsUsed */ false));
 	bool success = parser.parse(_argc, _argv, isatty(fileno(stdin)));
 	if (!success)
 		return false;
-	g_hasOutput = g_hasOutput || parser.hasOutput();
+	m_hasOutput = m_hasOutput || parser.hasOutput();
 	m_options = parser.options();
 
 	return true;
@@ -626,7 +618,7 @@ bool CommandLineInterface::compile()
 
 		for (auto const& error: m_compiler->errors())
 		{
-			g_hasOutput = true;
+			m_hasOutput = true;
 			formatter.printErrorInformation(*error);
 		}
 
@@ -635,7 +627,7 @@ bool CommandLineInterface::compile()
 	}
 	catch (CompilerError const& _exception)
 	{
-		g_hasOutput = true;
+		m_hasOutput = true;
 		formatter.printExceptionInformation(_exception, "Compiler error");
 		return false;
 	}
@@ -669,7 +661,7 @@ bool CommandLineInterface::compile()
 			serr() << "Documentation parsing error: " << *boost::get_error_info<errinfo_comment>(_error) << endl;
 		else
 		{
-			g_hasOutput = true;
+			m_hasOutput = true;
 			formatter.printExceptionInformation(_error, _error.typeName());
 		}
 
@@ -985,7 +977,7 @@ bool CommandLineInterface::assemble(
 
 		for (auto const& error: stack.errors())
 		{
-			g_hasOutput = true;
+			m_hasOutput = true;
 			formatter.printErrorInformation(*error);
 		}
 		if (!Error::containsOnlyWarnings(stack.errors()))
@@ -1134,7 +1126,7 @@ void CommandLineInterface::outputCompilationResults()
 		handleNatspec(false, contract);
 	} // end of contracts iteration
 
-	if (!g_hasOutput)
+	if (!m_hasOutput)
 	{
 		if (!m_options.output.dir.empty())
 			sout() << "Compiler run successful. Artifact(s) can be found in directory " << m_options.output.dir << "." << endl;

solc/CommandLineInterface.h

@@ -29,6 +29,7 @@
 #include <libsolidity/interface/FileReader.h>
 #include <libyul/AssemblyStack.h>
 
+#include <iostream>
 #include <memory>
 #include <string>
 
@@ -38,7 +39,13 @@ namespace solidity::frontend
 class CommandLineInterface
 {
 public:
-	explicit CommandLineInterface(CommandLineOptions const& _options = CommandLineOptions{}):
+	explicit CommandLineInterface(
+		std::ostream& _sout,
+		std::ostream& _serr,
+		CommandLineOptions const& _options = CommandLineOptions{}
+	):
+		m_sout(_sout),
+		m_serr(_serr),
 		m_options(_options)
 	{}
 
@@ -106,6 +113,17 @@ private:
 	/// @arg _json json string to be written
 	void createJson(std::string const& _fileName, std::string const& _json);
 
+	/// Returns the stream that should receive normal output. Sets m_hasOutput to true if the
+	/// stream has ever been used unless @arg _markAsUsed is set to false.
+	std::ostream& sout(bool _markAsUsed = true);
+
+	/// Returns the stream that should receive error output. Sets m_hasOutput to true if the
+	/// stream has ever been used unless @arg _markAsUsed is set to false.
+	std::ostream& serr(bool _markAsUsed = true);
+
+	std::ostream& m_sout;
+	std::ostream& m_serr;
+	bool m_hasOutput = false;
 	bool m_error = false; ///< If true, some error occurred.
 	FileReader m_fileReader;
 	std::unique_ptr<frontend::CompilerStack> m_compiler;

solc/main.cpp

@@ -54,7 +54,7 @@ static void setDefaultOrCLocale()
 int main(int argc, char** argv)
 {
 	setDefaultOrCLocale();
-	solidity::frontend::CommandLineInterface cli;
+	solidity::frontend::CommandLineInterface cli(cout, cerr);
 	if (!cli.parseArguments(argc, argv))
 		return 1;
 	if (!cli.processInput())