prepare writing info messages to the minibuffer

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@3390 a592a061-630c-0410-9148-cb99ea01b6c8

src/mathed/formulabase.C

@@ -378,6 +378,8 @@ InsetFormulaBase::localDispatch(BufferView * bv, kb_action action,
 	case LFUN_RIGHT:
 		result = mathcursor->right(sel) ? DISPATCHED : FINISHED_RIGHT;
 		updateLocal(bv, false);
+		// write something to the minibuffer
+		//bv->owner()->message(mathcursor->info());
 		break;
 
 

src/mathed/math_cursor.C

@@ -1470,3 +1470,12 @@ void MathCursor::setSelection(cursor_type const & where, size_type n)
 	Cursor_ = where;
 	cursor().pos_ += n;
 }
+
+
+string MathCursor::info() const
+{
+	std::ostringstream os;
+	if (pos() > 0)
+		prevAtom()->infoize(os);
+	return os.str();
+}

src/mathed/math_cursor.h

@@ -231,6 +231,8 @@ public:
 	/// reference to the last item of the path, i.e. "The Cursor"
 	MathCursorPos const & cursor() const;
 
+	/// describe the situation
+	string info() const;
 	/// dump selection information for debugging
 	void seldump(char const * str) const;
 	/// dump selection information for debugging

src/mathed/math_inset.h

@@ -66,6 +66,7 @@ class OctaveStream;
 class MapleStream;
 class MathMLStream;
 class WriteStream;
+class InfoStream;
 class MathArray;
 
 class LaTeXFeatures;
@@ -234,6 +235,8 @@ public:
 	virtual void mathmlize(MathMLStream &) const;
 	/// write content as something readable by Octave
 	virtual void octavize(OctaveStream &) const;
+	/// describe content
+	virtual void infoize(std::ostream &) const {}
 
 	/// dump content to stderr for debugging
 	virtual void dump() const;

src/mathed/math_symbolinset.C

@@ -177,3 +177,9 @@ void MathSymbolInset::write(WriteStream & os) const
 }
 
 
+void MathSymbolInset::infoize(std::ostream & os) const
+{
+	os << '\\' << name();
+}
+
+

src/mathed/math_symbolinset.h

@@ -46,6 +46,8 @@ public:
 	void octavize(OctaveStream &) const;
 	///
 	void write(WriteStream & os) const;
+	///
+	void infoize(std::ostream & os) const;
 
 private:
 	///