Node monitoring and on-the-fly textencoding change

This work is based on the draft node monitoring implementation
created by Vlad Slepukhin during GCI 2012 and includes following:

* Refactoring of the document "Reload" feature - it replaces
"Revert to saved" one because do the same things and a bit more.
Looks like we have to keep "Reload" menu entry alive until
StyledEdit will get more functional Undo/Redo features. Reload
functionality is also heavily used in node monitoring and
on-the-fly text encoding changing. Fixes #6887;

* Support for text encoding on-the-fly switching. This make
life easier for those who lives in countires with multiple
popular 8-bit encodings. Russia is the sample of such
de facto standards' clash (KOI-8R vs CP1251 etc.);

* Node Monitoring support with alerting user in case the file
size or modification time were changed. Another alert is shown
in case edited file was removed or moved outside of the current
volume. Moving file inside of current volume silently changes
references. Choosing "Ignore" will supress new change alerts
until next Reload or Save user request;

* Do not nag user on quiting window with zero-length untitled
document. Not a Big Deal but annoys in some cases using this
editor session as temporary storage.

src/apps/stylededit/Constants.h

@@ -25,7 +25,7 @@ const uint32 MENU_NEW					= 'MFnw';
 const uint32 MENU_OPEN					= 'MFop';
 const uint32 MENU_SAVE					= 'MSav';
 const uint32 MENU_SAVEAS				= 'MEsa';
-const uint32 MENU_REVERT				= 'MFre';
+const uint32 MENU_RELOAD				= 'MFrl';
 const uint32 MENU_CLOSE					= 'MFcl';
 const uint32 MENU_PAGESETUP				= 'MFps';
 const uint32 MENU_PRINT					= 'MFpr';

src/apps/stylededit/StyledEditView.cpp

@@ -73,8 +73,11 @@ StyledEditView::SetSuppressChanges(bool suppressChanges)
 
 
 status_t
-StyledEditView::GetStyledText(BPositionIO* stream)
+StyledEditView::GetStyledText(BPositionIO* stream, const char* forceEncoding)
 {
+	if (forceEncoding != NULL)
+		fEncoding = strcmp(forceEncoding, "auto") != 0 ? forceEncoding : "";
+
 	fSuppressChanges = true;
 	status_t result = BTranslationUtils::GetStyledText(stream, this,
 		fEncoding.String());
@@ -85,24 +88,25 @@ StyledEditView::GetStyledText(BPositionIO* stream)
 
 	BNode* node = dynamic_cast<BNode*>(stream);
 	if (node != NULL) {
-		// get encoding
-		if (node->ReadAttrString("be:encoding", &fEncoding) != B_OK) {
-			// try to read as "int32"
-			int32 encoding;
-			ssize_t bytesRead = node->ReadAttr("be:encoding", B_INT32_TYPE, 0,
-				&encoding, sizeof(encoding));
-			if (bytesRead == (ssize_t)sizeof(encoding)) {
-				if (encoding == 65535) {
-					fEncoding = "UTF-8";
-				} else {
-					const BCharacterSet* characterSet
-						= BCharacterSetRoster::GetCharacterSetByConversionID(encoding);
-					if (characterSet != NULL)
-						fEncoding = characterSet->GetName();
+		if (forceEncoding == NULL) {
+			// get encoding
+			if (node->ReadAttrString("be:encoding", &fEncoding) != B_OK) {
+				// try to read as "int32"
+				int32 encoding;
+				ssize_t bytesRead = node->ReadAttr("be:encoding", B_INT32_TYPE, 0,
+					&encoding, sizeof(encoding));
+				if (bytesRead == (ssize_t)sizeof(encoding)) {
+					if (encoding == 65535) {
+						fEncoding = "UTF-8";
+					} else {
+						const BCharacterSet* characterSet
+							= BCharacterSetRoster::GetCharacterSetByConversionID(encoding);
+						if (characterSet != NULL)
+							fEncoding = characterSet->GetName();
+					}
 				}
 			}
 		}
-
 		// TODO: move those into BTranslationUtils::GetStyledText() as well?
 
 		// restore alignment

src/apps/stylededit/StyledEditView.h

@@ -34,7 +34,8 @@ class StyledEditView : public BTextView {
 
 		void		Reset();
 		void		SetSuppressChanges(bool suppressChanges);
-		status_t	GetStyledText(BPositionIO* stream);
+		status_t	GetStyledText(BPositionIO* stream,
+							const char* forceEncoding = NULL);
 		status_t	WriteStyledEditFile(BFile* file);
 
 		void 		SetEncoding(uint32 encoding);