Bram,
here is a patch, that makes undofile() return an empty string, if given
an empty string. Consider this:
vim -u NONE -U NONE -N -c ':set undofile|echo undofile(@%)'
this returns something like this:
/home/.chrisbra.un~
(/home/chrisbra is my $HOME), even though I think, when giving an empty
string as argument undofile() should return an empty string.
So this is what the following patch does. I refrained from patching
FullName_save() because I don't know if this function should return
NULL, if given an empty argument, so I only make f_undofile() check for
the empty string.
diff --git a/src/eval.c b/src/eval.c
--- a/src/eval.c
+++ b/src/eval.c
@@ -18259,11 +18259,18 @@
rettv->v_type = VAR_STRING;
#ifdef FEAT_PERSISTENT_UNDO
{
- char_u *ffname = FullName_save(get_tv_string(&argvars[0]), FALSE);
-
- if (ffname != NULL)
- rettv->vval.v_string = u_get_undo_file_name(ffname, FALSE);
- vim_free(ffname);
+ char_u *ffname = get_tv_string(&argvars[0]);
+
+ if (*ffname == NUL)
+ rettv->vval.v_string = NULL;
+ else
+ {
+ ffname = FullName_save(ffname, FALSE);
+
+ if (ffname != NULL)
+ rettv->vval.v_string = u_get_undo_file_name(ffname, FALSE);
+ vim_free(ffname);
+ }
}
#else
rettv->vval.v_string = NULL;
regards,
Christian
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