[Texmacs-dev] Cursor left/right movement with wrapping

[Josef Weidendorfer]

Hi,

I find it a little irritating that pressing key "right" at the and of a line 
doesn't go the the start of the next line. This is obviously because cursor 
movement is done only in geometrical means, i.e. cursor right always tries to 
go to the right. I think that at least if this is not possible, it should 
follow the text structure "to the right".

Attached is a small patch to allow left/right cursor movement to wrap at line 
starts/ends in the middle of a paragraph. Currently I don't jump among 
different tree levels. Aren't there any general document tree navigation 
functions? I only found specialized version e.g. for searching.

Similar, I think the following navigation should work:
* Home/End to start/end of line instead of start/end of paragraph
* C+Left/Right to previous/next word
* C+Up/Down to previous/next paragraph
Are patches welcome for this, or is this already possible with keyboard 
bindings?

Cheers,
Josef

RCS file: /texmacs/src/src/Edit/Interface/edit_cursor.cpp,v
retrieving revision 1.7
diff -u -p -b -r1.7 edit_cursor.cpp
--- edit_cursor.cpp     23 Sep 2004 11:17:23 -0000      1.7
+++ edit_cursor.cpp     8 Dec 2004 17:50:59 -0000
@@ -48,7 +48,20 @@ edit_cursor_rep::cursor_move_sub (SI& x0
   if (ref_p == tree_path (x0, y0, d0+ dx*DELTA)) {
     for (i=1; i<DELTA; i=i<<1)
       if (ref_p != tree_path (x0+ dx*i, y0+ dy*i, d0+ dx*DELTA)) break;
-    if (i>=DELTA) return false;
+    if (i>=DELTA) {
+      if (dx == 0) return false;
+
+      // Try line wrapping for horizontal move
+      path p = path_add(ref_p,dx);
+      if (p == ref_p) return false;
+      cursor cu = eb->find_check_cursor(p);
+      if (!cu->valid) return false;
+      x0 = cu->ox;
+      y0 = cu->oy;
+      d0 = cu->delta;
+      tp = p;
+      return true;
+    }
     for (d=i>>2; d>=1; d=d>>1)