[Tcl-bugs] [ tcl-Bugs-405084 ] Incompatibility in "trace" parameters

[nobody <no...@so...>]

Bugs #405084, was updated on 2001-02-28 22:46
You can respond by visiting: 
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Category: Commands M-Z
Group: 8.4a2
Status: Open
Priority: 5
Submitted By: Georgios Petasis
Assigned to: Nobody/Anonymous
Summary: Incompatibility in "trace" parameters

Initial Comment:
Incompatibility between "trace add variable" and "trace variable".

According to the "trace" manual, "trace variable" is equivelant to 
"trace add variable". But:

1) They don't give the same error messages.
% trace variable
wrong # args: should be "trace variable name ops command"
% trace add variable
wrong # args: should be "trace add variable name opList command"

2) According to the manual, the following should work (and works):
proc tracecall {name1 name2 op} {
  puts "name1=\$name1\, name2=\$name2\, op=\$op\"
}
trace add variable x write tracecall
set x 1

> name1="x", name2="", op="write"

But trying:

trace variable y write tracecall
> bad operations "write": should be one or more of rwua

So, "trace variable" accepts only abbreviations?

3) Finally, the manual info about "trace add variable" is incomplete, since
it does not describe the operation "read" which exists and is referenced 
in the descussion about the parameters passed to the "command" parameter
of the "trace add variable".

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