use ToLower() instead of calling std::transform explicitly all the time

src/helpers.cpp

@@ -18,7 +18,6 @@
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  ***************************************************************************/
 
-#include <algorithm>
 #include "helpers.h"
 #include "tag_editor.h"
 
@@ -77,8 +76,8 @@ void UnlockStatusbar()
 
 bool CaseInsensitiveSorting::operator()(string a, string b)
 {
-	transform(a.begin(), a.end(), a.begin(), tolower);
-	transform(b.begin(), b.end(), b.begin(), tolower);
+	ToLower(a);
+	ToLower(b);
 	return a < b;
 }
 
@@ -86,8 +85,8 @@ bool CaseInsensitiveSorting::operator()(Song *sa, Song *sb)
 {
 	string a = sa->GetName();
 	string b = sb->GetName();
-	transform(a.begin(), a.end(), a.begin(), tolower);
-	transform(b.begin(), b.end(), b.begin(), tolower);
+	ToLower(a);
+	ToLower(b);
 	return a < b;
 }
 
@@ -97,8 +96,8 @@ bool CaseInsensitiveSorting::operator()(const Item &a, const Item &b)
 	{
 		string sa = a.type == itSong ? a.song->GetName() : a.name;
 		string sb = b.type == itSong ? b.song->GetName() : b.name;
-		transform(sa.begin(), sa.end(), sa.begin(), tolower);
-		transform(sb.begin(), sb.end(), sb.begin(), tolower);
+		ToLower(sa);
+		ToLower(sb);
 		return sa < sb;
 	}
 	else

src/lyrics.cpp

@@ -71,7 +71,7 @@ void * GetArtistInfo(void *ptr)
 	delete strptr;
 	
 	string filename = artist + ".txt";
-	transform(filename.begin(), filename.end(), filename.begin(), tolower);
+	ToLower(filename);
 	EscapeUnallowedChars(filename);
 	
 	const string fullpath = artists_folder + "/" + filename;

src/misc.cpp

@@ -18,6 +18,7 @@
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  ***************************************************************************/
 
+#include <algorithm>
 #include "misc.h"
 
 using std::stringstream;
@@ -27,6 +28,11 @@ int Abs(int num)
 	return (num < 0 ? -num : num);
 }
 
+void ToLower(string &s)
+{
+	transform(s.begin(), s.end(), s.begin(), tolower);
+}
+
 int StrToInt(string str)
 {
 	return atoi(str.c_str());

src/misc.h

@@ -30,6 +30,8 @@ using std::string;
 
 int Abs(int);
 
+void ToLower(string &);
+
 int StrToInt(string);
 
 string IntoStr(int);

src/ncmpcpp.cpp

@@ -2945,13 +2945,13 @@ int main(int argc, char *argv[])
 				timer = time(NULL);
 				if (findme.empty())
 					continue;
-				transform(findme.begin(), findme.end(), findme.begin(), tolower);
+				ToLower(findme);
 				
 				ShowMessage("Searching...");
 				for (int i = (wCurrent == mSearcher ? search_engine_static_options-1 : 0); i < wCurrent->Size(); i++)
 				{
 					string name = Window::OmitBBCodes(wCurrent->GetOption(i));
-					transform(name.begin(), name.end(), name.begin(), tolower);
+					ToLower(name);
 					if (name.find(findme) != string::npos && !wCurrent->IsStatic(i))
 					{
 						vFoundPositions.push_back(i);

src/search_engine.cpp

@@ -90,27 +90,27 @@ void Search(Song &s)
 	{
 		string t;
 		t = s.GetFile();
-		transform(t.begin(), t.end(), t.begin(), tolower);
+		ToLower(t);
 		s.SetFile(t);
 		
 		t = s.GetTitle();
-		transform(t.begin(), t.end(), t.begin(), tolower);
+		ToLower(t);
 		s.SetTitle(t);
 		
 		t = s.GetArtist();
-		transform(t.begin(), t.end(), t.begin(), tolower);
+		ToLower(t);
 		s.SetArtist(t);
 		
 		t = s.GetAlbum();
-		transform(t.begin(), t.end(), t.begin(), tolower);
+		ToLower(t);
 		s.SetAlbum(t);
 		
 		t = s.GetGenre();
-		transform(t.begin(), t.end(), t.begin(), tolower);
+		ToLower(t);
 		s.SetGenre(t);
 		
 		t = s.GetComment();
-		transform(t.begin(), t.end(), t.begin(), tolower);
+		ToLower(t);
 		s.SetComment(t);
 	}
 	
@@ -122,27 +122,27 @@ void Search(Song &s)
 		{
 			string t;
 			t = copy.GetName();
-			transform(t.begin(), t.end(), t.begin(), tolower);
+			ToLower(t);
 			copy.SetFile(t);
-		
+			
 			t = copy.GetTitle();
-			transform(t.begin(), t.end(), t.begin(), tolower);
+			ToLower(t);
 			copy.SetTitle(t);
-		
+			
 			t = copy.GetArtist();
-			transform(t.begin(), t.end(), t.begin(), tolower);
+			ToLower(t);
 			copy.SetArtist(t);
-		
+			
 			t = copy.GetAlbum();
-			transform(t.begin(), t.end(), t.begin(), tolower);
+			ToLower(t);
 			copy.SetAlbum(t);
-		
+			
 			t = copy.GetGenre();
-			transform(t.begin(), t.end(), t.begin(), tolower);
+			ToLower(t);
 			copy.SetGenre(t);
-		
+			
 			t = copy.GetComment();
-			transform(t.begin(), t.end(), t.begin(), tolower);
+			ToLower(t);
 			copy.SetComment(t);
 		}
 		else