On 22 May 2003 13:10:17 +0000, Mikhael Goikhman wrote:
>
> On 22 May 2003 13:32:22 +0200, Mathias Megyei;Munich wrote:
> >
> > What about "Given"?
> > ("Given" will be introduced in Perl 6 for statement like
> > switch ... case.)
>
> Just thought about something new. The current "Cond" and "CondCase"
> may probably be mixed into the "On" command.
>
> If we take this "Given" suggestion here goes:
>
> Next (XTerm) WarpToWindow
> Given (Match) Focus
> Given (!Match) Break
>
> Actually this "Given" syntax is for "Cond". "CondCase (Match)" may be
> replaced with "Given (Match) Continue". Yes I think it is good and useful
> to have Continue command (prefix) that just preserves the previous
> returning code ignoring a possible returning code of the current command.
>
> Here is an example for a case statement:
>
> Given (Version < 2.7.2) Echo Please upgrade to at least 2.7.2
> Given (Match) # do something old
> Given (NoMatch) # do something new for 2.7.2+
>
> Another examples (probably "-" may be optional):
>
> Given (-x fvwm-root) Exec fvwm-root bg.xpm
> Given (NoMatch) Exec xmessage "Fix your PATH for fvwm-config & fvwm-root"
>
> Next (MyConsole) MoveToDesk
> Given (Match) Raise
> Given (!Match) Given (-x rxvt) Exec rxvt -name MyConsole
> Given (NoMatch, -x xterm) Exec xterm -name MyConsole
>
> I think that I like this syntax.
It's buggy. For this to actually work, we should keep separate return
codes for window based conditionals ("Match", "NoMatch", "Error") and non
window conditional, i.e. "Given", the new codes may be "Then" and "Else".
Given (Version < 2.7.2) Echo Please upgrade to at least 2.7.2
Given (Then) # do something old
Given (Then) # do something old
Given (Else) # do something new for 2.7.2+
Given (Then) # do something new for 2.7.2+
And the last example may be:
Next (MyConsole) MoveToDesk
Given (Match) Raise
Given (Match, Xinerama) MoveToScreen # just an example
Given (!Match) Break
Given (-x rxvt) Exec rxvt -name MyConsole
Given (Else, -x xterm) Exec xterm -name MyConsole
Given (Else) Echo No good terminal found to run MyConsole
Probably there are more intuitive names than "Then" and "Else", like
"Pass" and "Fail".
Maybe it is not such a perfect idea to combine "Cond" and "On".
But it seems to work ok and separating return codes is good in any case.
What do you think?
Regards,
Mikhael.
--
Visit the official FVWM web page at <URL:http://www.fvwm.org/>.
To unsubscribe from the list, send "unsubscribe fvwm-workers" in the
body of a message to [EMAIL PROTECTED]
To report problems, send mail to [EMAIL PROTECTED]
