Revert r29444 (to be soon replaced by Georg's solution).

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@29497 a592a061-630c-0410-9148-cb99ea01b6c8

src/support/FileName.cpp

@@ -927,22 +927,49 @@ docstring const FileName::relPath(string const & path) const
 }
 
 
-bool operator==(FileName const & lhs, FileName const & rhs)
+// Note: According to Qt, QFileInfo::operator== is undefined when
+// both files do not exist (Qt4.5 gives true for all non-existent
+// files, while Qt4.4 compares the filenames).
+// see:
+// http://www.qtsoftware.com/developer/task-tracker/
+//   index_html?id=248471&method=entry.
+bool operator==(FileName const & l, FileName const & r)
 {
-	// Avoid unnecessary checks below
-	if (lhs.empty() || rhs.empty())
-		return lhs.empty() && rhs.empty();
+	// FIXME: In future use Qt.
+	// Qt 4.4: We need to solve this warning from Qt documentation:
+	// * Long and short file names that refer to the same file on Windows are
+	//   treated as if they referred to different files.
+	// This is supposed to be fixed for Qt5.
+	FileName const lhs(os::internal_path(l.absFilename()));
+	FileName const rhs(os::internal_path(r.absFilename()));
 
-	// Firstly, compare the filenames.
-	if (QString::compare(toqstr(lhs.absFilename()),
-			     toqstr(rhs.absFilename()),
-			     os::isFilesystemCaseSensitive() ?
-			     Qt::CaseSensitive : Qt::CaseInsensitive) == 0) {
-		return true;
+	if (lhs.empty())
+		// QFileInfo::operator==() returns false if the two QFileInfo are empty.
+		return rhs.empty();
+
+	if (rhs.empty())
+		// Avoid unnecessary checks below.
+		return false;
+
+	lhs.d->refresh();
+	rhs.d->refresh();
+
+	if (!lhs.d->fi.isSymLink() && !rhs.d->fi.isSymLink()) {
+		// Qt already checks if the filesystem is case sensitive or not.
+		// see note above why the extra check with fileName is needed.
+		return lhs.d->fi == rhs.d->fi
+			&& lhs.d->fi.fileName() == rhs.d->fi.fileName();
 	}
 
-	// They don't match, so check whether they point to the same file.
-	return os::isSameFile(lhs.toFilesystemEncoding(), rhs.toFilesystemEncoding());
+	// FIXME: When/if QFileInfo support symlink comparison, remove this code.
+	QFileInfo fi1(lhs.d->fi);
+	if (fi1.isSymLink())
+		fi1 = QFileInfo(fi1.symLinkTarget());
+	QFileInfo fi2(rhs.d->fi);
+	if (fi2.isSymLink())
+		fi2 = QFileInfo(fi2.symLinkTarget());
+	// see note above why the extra check with fileName is needed.
+	return fi1 == fi2 && fi1.fileName() == fi2.fileName();
 }
 
 

src/support/os.h

@@ -112,11 +112,6 @@ bool canAutoOpenFile(std::string const & ext, auto_open_mode const mode = VIEW);
  */
 bool autoOpenFile(std::string const & filename, auto_open_mode const mode = VIEW);
 
-/** Check whether two filenames point to the same file.
-  * \warning the filenames must already be in the filesystem encoding.
-  */
-bool isSameFile(std::string const & fileone, std::string const & filetwo);
-
 /** Resolves a path such that it does not contain '.', '..', or symbolic links.
   * \warning the path must already be in the filesystem encoding.
   * \returns the resolved path in utf8 encoding.

src/support/os_cygwin.cpp

@@ -28,8 +28,8 @@
 #include <shlwapi.h>
 #include <limits.h>
 #include <stdlib.h>
+
 #include <sys/cygwin.h>
-#include <sys/stat.h>
 
 using namespace std;
 
@@ -284,21 +284,6 @@ bool autoOpenFile(string const & filename, auto_open_mode const mode)
 }
 
 
-bool isSameFile(string const & fileone, string const & filetwo)
-{
-	struct stat st1;
-	struct stat st2;
-
-	if (::stat(fileone.c_str(), &st1) == 0
-	    && ::stat(filetwo.c_str(), &st2) == 0) {
-		return st1.st_ino == st2.st_ino && st1.st_dev == st2.st_dev;
-	}
-
-	// One or both files cannot be accessed.
-	return false;
-}
-
-
 string real_path(string const & path)
 {
 	char rpath[PATH_MAX + 1];

src/support/os_unix.cpp

@@ -19,7 +19,6 @@
 
 #include <limits.h>
 #include <stdlib.h>
-#include <sys/stat.h>
 
 #ifdef __APPLE__
 #include <Carbon/Carbon.h>
@@ -220,21 +219,6 @@ bool autoOpenFile(string const & filename, auto_open_mode const mode)
 }
 
 
-bool isSameFile(string const & fileone, string const & filetwo)
-{
-	struct stat st1;
-	struct stat st2;
-
-	if (::stat(fileone.c_str(), &st1) == 0
-	    && ::stat(filetwo.c_str(), &st2) == 0) {
-		return st1.st_ino == st2.st_ino && st1.st_dev == st2.st_dev;
-	}
-
-	// One or both files cannot be accessed.
-	return false;
-}
-
-
 string real_path(string const & path)
 {
 	char rpath[PATH_MAX + 1];

src/support/os_win32.cpp

@@ -390,43 +390,6 @@ bool autoOpenFile(string const & filename, auto_open_mode const mode)
 }
 
 
-bool isSameFile(string const & fileone, string const & filetwo)
-{
-	HANDLE h1 = CreateFile(fileone.c_str(), 0,
-		FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
-	HANDLE h2 = CreateFile(filetwo.c_str(), 0,
-		FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
-
-	if (h1 == INVALID_HANDLE_VALUE || h2 == INVALID_HANDLE_VALUE) {
-		// One or both files cannot be accessed.
-		if (h1 != INVALID_HANDLE_VALUE)
-			CloseHandle(h1);
-		if (h2 != INVALID_HANDLE_VALUE)
-			CloseHandle(h2);
-		return false;
-	}
-
-	BY_HANDLE_FILE_INFORMATION info1;
-	BY_HANDLE_FILE_INFORMATION info2;
-	bool samefile = false;
-	if (GetFileInformationByHandle(h1, &info1) != 0
-	    && GetFileInformationByHandle(h2, &info2) != 0) {
-		// Serial number of the volumes containing the files.
-		ULONG st1_dev = info1.dwVolumeSerialNumber;
-		ULONG st2_dev = info2.dwVolumeSerialNumber;
-		// Unique identifiers associated to the files on the volumes.
-		ULONGLONG highbits = info1.nFileIndexHigh & 0x0000FFFF;
-		ULONGLONG st1_ino = (highbits << sizeof(ULONG)) | info1.nFileIndexLow;
-		highbits = info2.nFileIndexHigh & 0x0000FFFF;
-		ULONGLONG st2_ino = (highbits << sizeof(ULONG)) | info2.nFileIndexLow;
-		samefile = st1_ino == st2_ino && st1_dev == st2_dev;
-	}
-	CloseHandle(h1);
-	CloseHandle(h2);
-	return samefile;
-}
-
-
 string real_path(string const & path)
 {
 	// See http://msdn.microsoft.com/en-us/library/aa366789(VS.85).aspx