Hi Chris,
Your use of elsif seems correct. What is not, however, is the use of { }
x = { <expr> } is a shorthand for:
def x() =
<expr>
end
So, when you write:
if { 00h } then ..
You are actually passing a function for the if condition, where it should
be a boolean, true or false.
It might be a little confusing at first but actually time predicate are
booleans, they are true or false depending on the time your script is
executed. You can try that in the interactive console:
13:35 toots@host % ledit liquidsoap --interactive
(...)
# 12h;;
- : bool = false
# 13h;;
- : bool = true
#
So, in your script, you should write things this way:
if 00h then
...
elseif 01h then
...
end
Hope this makes sense,
Romain
2016-11-07 13:11 GMT-06:00 Chris Polley <[email protected]>:
> Hi,
> I'm wondering if there's a way to use a predicate expression as a boolean
in
> an if-then-elsif-... expression.
>
> What I'm trying to do is to set metadata on a input stream based on a
> published schedule where the feed provider doesn't set metadata. I also
> don't want to set up a multitude of exec_at schedules, one for each hour
or
> half-hour and feed, each with its own predicate, thinking that the
overhead
> of a single exec_at and one if-then-else for each feed (there are three in
> my case) would be more efficient.
>
> However, this doesn't compile complaining that it is expecting a bool
> instead of the ()->_ which it sees there at the predicate clause.
>
> I don't even know if I have the syntax correct for the
fst(insert_metadata)
> function, so if that looks wrong, some help on that usage would be
> appreciated also.
>
> e.g.:
>
> p_feed = insert_metadata(id="Feed Name", audio_to_stereo(
> input.http(id="feed", max=20., "http://feed_server/url";)))
>
> feed = snd(p_feed)
> feed_setmetadata = fst(p_feed)
>
>
> def set_metadata()
>
> if { 00h } then
> feed_setmetadata( [ ( "artist", "Network" ), ("title", "Show 1") ] )
> elsif { 01h } then
> feed_setmetadata( [ ( "artist", "Network" ), ("title", "Show 2") ] )
> elsif { 02h } then
> feed_setmetadata( [ ( "artist", "Network" ), ("title", "Show 3") ] )
> elsif { 03h00m-03h29m } then
> feed_setmetadata( [ ( "artist", "Network" ), ("title", "Show 4") ] )
> elsif { 03h30m-03h59m } then
> feed_setmetadata( [ ( "artist", "Network" ), ("title", "Show 5") ] )
> elsif { 04h00m-05h29m } then
> feed_setmetadata( [ ( "artist", "Network" ), ("title", "Show 6") ] )
> elsif { 04h30m-05h59m } then
> feed_setmetadata( [ ( "artist", "Network" ), ("title", "Show 7") ] )
> #... for each hour in the day
> else
> feed_setmetadata( [ ( "artist", "Network" ), ("title", "") ] )
> end
>
> end
>
>
>
> exec_at(freq=60., pred=true, set_metadata)
>
> #...
> # feed then sent to an output.icecast
> #
>
> Thanks!
>
>
>
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