logic: Fixed FilePath to not expand environment variables in constructor

src/lib/utility/file/FilePath.cpp

@@ -1,32 +1,34 @@
 #include "utility/file/FilePath.h"
 
 #include <regex>
+
 #include "utility/logging/logging.h"
 
 FilePath::FilePath()
 	: m_exists(false)
+	, m_checkedExists(false)
 {
 }
 
 FilePath::FilePath(const char* filePath)
 	: m_path(filePath)
 	, m_exists(false)
+	, m_checkedExists(false)
 {
-	init();
 }
 
 FilePath::FilePath(const std::string& filePath)
 	: m_path(filePath)
 	, m_exists(false)
+	, m_checkedExists(false)
 {
-	init();
 }
 
 FilePath::FilePath(const boost::filesystem::path& filePath)
 	: m_path(filePath)
 	, m_exists(false)
+	, m_checkedExists(false)
 {
-	init();
 }
 
 boost::filesystem::path FilePath::path() const
@@ -41,6 +43,12 @@ bool FilePath::empty() const
 
 bool FilePath::exists() const
 {
+	if (!m_checkedExists)
+	{
+		m_exists = boost::filesystem::exists(m_path);
+		m_checkedExists = true;
+	}
+
 	return m_exists;
 }
 
@@ -103,25 +111,22 @@ FilePath FilePath::canonical() const
 
 FilePath FilePath::expandEnvironmentVariables() const
 {
-	return FilePath(expandEnvironmentVariables(str()));
-}
+	std::string text = str();
 
-std::string FilePath::expandEnvironmentVariables(const std::string& path) const
-{
-	std::string text = path;
-
-	static std::regex env( "\\$\\{([^}]+)\\}|%([0-9A-Za-z\\/]*)%" );
+	static std::regex env("\\$\\{([^}]+)\\}|%([0-9A-Za-z\\/]*)%");
 	std::smatch match;
-	while ( std::regex_search( text, match, env ) ) {
-		const char * s = getenv( match[1].str().c_str() );
+	while (std::regex_search(text, match, env))
+	{
+		const char * s = getenv(match[1].str().c_str());
 		if (s == nullptr)
 		{
 			LOG_ERROR(match[1].str() + " is no a environment variable");
-			return path;
+			return FilePath();
 		}
 		text.replace( match[0].first, match[0].second, s);
 	}
-	return text;
+
+	return FilePath(text);
 }
 
 FilePath FilePath::relativeTo(const FilePath& other) const
@@ -188,7 +193,7 @@ FilePath FilePath::withoutExtension() const
 	return FilePath(boost::filesystem::path(m_path).replace_extension());
 }
 
-FilePath FilePath::replaceExtension(const std::string& extension)
+FilePath FilePath::replaceExtension(const std::string& extension) const
 {
 	return FilePath(boost::filesystem::path(m_path).replace_extension(extension));
 }
@@ -225,12 +230,3 @@ bool FilePath::operator<(const FilePath& other) const
 {
 	return m_path.compare(other.m_path) < 0;
 }
-
-void FilePath::init()
-{
-	boost::filesystem::path p(expandEnvironmentVariables(m_path.generic_string()));
-	if (boost::filesystem::exists(p))
-	{
-		m_exists = true;
-	}
-}