string: fix lowercase function

src/actions.cpp

@@ -2065,8 +2065,7 @@ void AddRandomItems::Run()
 	if (answer != 's')
 	{
 		tag_type = charToTagType(answer);
-		tag_type_str = tagTypeToString(tag_type);
-		lowercase(tag_type_str);
+		tag_type_str = lowercase(tagTypeToString(tag_type));
 	}
 	else
 		tag_type_str = "song";
@@ -2137,7 +2136,7 @@ void ToggleLibraryTagType::Run()
 		std::string item_type = tagTypeToString(Config.media_lib_primary_tag);
 		myLibrary->Tags->setTitle(Config.titles_visibility ? item_type + "s" : "");
 		myLibrary->Tags->reset();
-		lowercase(item_type);
+		item_type = lowercase(item_type);
 		if (myLibrary->Columns() == 2)
 		{
 			myLibrary->Songs->clear();

src/browser.cpp

@@ -609,8 +609,7 @@ bool hasSupportedExtension(const std::string &file)
 	if (last_dot > file.length())
 		return false;
 	
-	std::string ext = file.substr(last_dot+1);
-	lowercase(ext);
+	std::string ext = lowercase(file.substr(last_dot+1));
 	return SupportedExtensions.find(ext) != SupportedExtensions.end();
 }
 

src/lastfm.cpp

@@ -124,8 +124,7 @@ void Lastfm::Load()
 	std::string artist = itsArgs.find("artist")->second;
 	locale_to_utf(artist);
 	
-	std::string file = artist + ".txt";
-	lowercase(file);
+	std::string file = lowercase(artist + ".txt");
 	removeInvalidCharsFromFilename(file);
 	
 	itsFilename = itsFolder + "/" + file;

src/media_library.cpp

@@ -214,8 +214,7 @@ void MediaLibrary::SwitchTo()
 					NextColumn();
 				if (Config.titles_visibility)
 				{
-					std::string item_type = tagTypeToString(Config.media_lib_primary_tag);
-					lowercase(item_type);
+					std::string item_type = lowercase(tagTypeToString(Config.media_lib_primary_tag));
 					Albums->setTitle("Albums (sorted by " + item_type + ")");
 				}
 				else
@@ -766,8 +765,7 @@ void MediaLibrary::LocateSong(const MPD::Song &s)
 	}
 	if (primary_tag.empty())
 	{
-		std::string item_type = tagTypeToString(Config.media_lib_primary_tag);
-		lowercase(item_type);
+		std::string item_type = lowercase(tagTypeToString(Config.media_lib_primary_tag));
 		ShowMessage("Can't use this function because the song has no %s tag set", item_type.c_str());
 		return;
 	}
@@ -855,8 +853,7 @@ void MediaLibrary::AddToPlaylist(bool add_n_play)
 			if ((!Tags->empty() && w == Tags)
 			||  (w == Albums && Albums->current().value().Date == AllTracksMarker))
 			{
-				std::string tag_type = tagTypeToString(Config.media_lib_primary_tag);
-				lowercase(tag_type);
+				std::string tag_type = lowercase(tagTypeToString(Config.media_lib_primary_tag));
 				ShowMessage("Songs with %s = \"%s\" added", tag_type.c_str(), Tags->current().value().c_str());
 			}
 			else if (w == Albums)

src/strbuffer.h

@@ -234,11 +234,13 @@ template <typename C> bool basic_buffer<C>::setFormatting(
 	if (s.empty())
 		return false;
 	bool result = false;
-	std::basic_string<C> base = m_string;
-	if (!case_sensitive)
+	std::basic_string<C> base;
+	if (case_sensitive)
+		base = m_string;
+	else
 	{
-		lowercase(s);
-		lowercase(base);
+		base = lowercase(m_string);
+		s = lowercase(s);
 	}
 	FormatPos fp;
 	for (size_t i = base.find(s); i != std::basic_string<C>::npos; i = base.find(s, i))
@@ -268,11 +270,13 @@ template <typename C> void basic_buffer<C>::removeFormatting(
 {
 	if (pattern.empty())
 		return;
-	std::basic_string<C> base = m_string;
-	if (!case_sensitive)
+	std::basic_string<C> base;
+	if (case_sensitive)
+		base = m_string;
+	else
 	{
-		lowercase(pattern);
-		lowercase(base);
+		base = lowercase(base);
+		pattern = lowercase(pattern);
 	}
 	FormatPos fp;
 	for (size_t i = base.find(pattern); i != std::basic_string<C>::npos; i = base.find(pattern, i))

src/tag_editor.cpp

@@ -1130,10 +1130,7 @@ void LowerAllLetters(MPD::MutableSong &s)
 	{
 		unsigned i = 0;
 		for (std::string tag; !(tag = (s.*m->Get)(i)).empty(); ++i)
-		{
-			lowercase(tag);
-			(s.*m->Set)(tag, i);
-		}
+			(s.*m->Set)(ToString(lowercase(ToWString(tag))), i);
 	}
 }
 

src/tiny_tag_editor.cpp

@@ -189,8 +189,7 @@ bool TinyTagEditor::getTags()
 	itsEdited.setComment(f.tag()->comment().to8Bit(1));
 	
 	std::string ext = itsEdited.getURI();
-	ext = ext.substr(ext.rfind(".")+1);
-	lowercase(ext);
+	ext = lowercase(ext.substr(ext.rfind(".")+1));
 	
 	if (!isInitialized)
 		Init();

src/utility/string.h

@@ -22,6 +22,7 @@
 #define _UTILITY_STRING
 
 #include <cstdarg>
+#include <locale>
 #include <string>
 #include <vector>
 #include "gcc.h"
@@ -52,6 +53,16 @@ template <size_t N> struct print<N, std::wstring> {
 	}
 };
 
+template <typename CharT>
+std::basic_string<CharT> lowercase(std::basic_string<CharT> s)
+{
+	std::locale loc;
+	const std::ctype<CharT> &ct = std::use_facet< std::ctype<CharT> >(loc);
+	for (auto it = s.begin(); it != s.end(); ++it)
+		*it = ct.tolower(*it);
+	return s;
+}
+
 int stringToInt(const std::string &s);
 long stringToLongInt(const std::string &s);
 bool isInteger(const char *s, bool accept_signed);
@@ -62,9 +73,6 @@ std::wstring ToWString(const std::string &s);
 std::vector<std::string> split(const std::string &s, const std::string &delimiter);
 void replace(std::string &s, const std::string &from, const std::string &to);
 
-void lowercase(std::string &s);
-void lowercase(std::wstring &s);
-
 void trim(std::string &s);
 
 std::string getBasename(const std::string &path);