Re: DOCS: include a sample "Makefile"?

[Anthony W. Youngman]

In message <address@hidden>, Jonathan Kulp 
<address@hidden> writes
> Anthony W. Youngman wrote:
> > > parts:
> > >       for LILYFILE in Parts/*.ly ; do $(LILY_CMD) "$$LILYFILE" ; done
> > >       mv *.pdf $(OUTDIR)/
> > >
> > > It works exactly as it did with the GNU wildcard, except that multiple files
> > > can't be compiled at once with separate processors.  I'll probably stick
> > > with the GNU wildcard approach in my personal makefiles, or else have
> > > both lines in there with one commented out.
> >  My bash-fu is minimal to non-existent, but couldn't you do something
> > like
> >          for LILYFILE in Parts/*.ly ; do $(LILY_CMD) "$$LILYFILE" & ;
> > done
> >         wait
> >         mv *.pdf $(OUTDIR)/
> >  ?
> >  I'm sure there's a command, and I think it is "wait", that says to 
> > wait
> > and collect status from all the jobs you've just spawned, so the mv
> > wouldn't run until all the LILY_CMD commands had completed.
> >  Cheers,
> > Wol
>
> It already waits until all of the files have been run before moving 
> them.  It just loops until it has done all of the files, then proceeds 
> to the next line and does the "mv" command.

I think you missed the "&" in my code :-)

If the "wait" isn't there, the mv will fail because there won't be any 
*.pdf files for it to move. Werner's point about multiple invocations of 
lilypond is very valid, but on a multi-processor machine my technique 
will use all processors. It'll probably be a bit slower on a 
uni-processor, though.

To explain ... let's say there are 10 lily files to process, each of 
which takes maybe 30 secs? My bash-fu thinks this technique will run 
lily 10 times, once for each file. WITHOUT the ampersand, the 10 
instances run in sequence, taking 5 minutes, and then the code moves on 
to the mv. WITH the ampersand, all ten instances are fired off at once, 
taking maybe 15 seconds, and then the code moves on to the next line. If 
that's the 'mv', then it won't find any pdfs! That's the point of the 
"wait" - to say "wait until all the lilys have finished before carrying 
on".

Cheers,
Wol
--
Anthony W. Youngman - address@hidden