Allow backspace to be bound to keys in .nanorc

Allow kdel to be rebound
Add note about rebinding kdel to backspace for those using OSX or PuTTY to connect to remote Linux machines in nanorc.sample.in

When undoing text deletes, move current_x to proper location



git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4281 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

doc/nanorc.sample.in

@@ -222,6 +222,9 @@
 # bind M-A casesens search
 # bind ^S research main
 
+## Set this if your backspace key sends delete most of the time (2.1.3+)
+# bind kdel backspace all
+
 
 ## Nanorc files
 # include "@PKGDATADIR@/nanorc.nanorc"

src/global.c

@@ -1446,6 +1446,8 @@ sc *strtosc(int menu, char *input)
 	s->scfunc = do_enter;
     else if (!strcasecmp(input, "delete"))
 	s->scfunc = do_delete;
+    else if (!strcasecmp(input, "backspace"))
+	s->scfunc = do_backspace;
     else if (!strcasecmp(input, "refresh"))
 	s->scfunc = total_refresh;
     else if (!strcasecmp(input, "casesens")) {

src/rcfile.c

@@ -380,7 +380,7 @@ void parse_keybinding(char *ptr)
     for (i = 0; i < strlen(keycopy); i++)
 	keycopy[i] = toupper(keycopy[i]);
 
-    if (keycopy[0] != 'M' && keycopy[0] != '^' && keycopy[0] != 'F') {
+    if (keycopy[0] != 'M' && keycopy[0] != '^' && keycopy[0] != 'F' && keycopy[0] != 'K') {
 	rcfile_error(
 		N_("keybindings must begin with \"^\", \"M\", or \"F\"\n"));
 	return;

src/text.c

@@ -393,6 +393,7 @@ void do_undo(void)
     fprintf(stderr, "Undo running for type %d\n", u->type);
 #endif
 
+    openfile->current_x = u->begin;
     switch(u->type) {
     case ADD:
 	action = _("text add");
@@ -413,6 +414,7 @@ void do_undo(void)
 	strcpy(&data[u->begin + strlen(u->strdata)], &f->data[u->begin]);
 	free(f->data);
 	f->data = data;
+	openfile->current_x += strlen(u->strdata);
 	break;
     case SPLIT:
 	action = _("line split");
@@ -442,7 +444,6 @@ void do_undo(void)
 
     }
     openfile->current = f;
-    openfile->current_x = u->begin;
     edit_refresh();
     statusbar(_("Undid action (%s)"), action);
     openfile->current_undo = openfile->current_undo->next;