Re: [A-a-p-user] target and source suffixes

[Bram M. <Br...@mo...>]

Matthew Weier O'Phinney wrote:

> Must target and source suffixes be different in order for a compile
> action to occur?
> 
> For instance, the following rule doesn't result in a compile, even when
> the source changes (:
> 
>     SRCFILES = `glob(*.html)`
>     HTMFILES = 
>     @for fname in SRCFILES.split()
>     @       htmname = os.path.basename(fname)
>             HTMFILES += $BDIR/$htmname { publish = $PUBLISH/$htmname }
> 
>     :rule %.html : %.html
>         :sys $COMPILER -d $SERVER -f $source > $target
> 
> Whereas this does:
> 
>     SRCFILES = `glob(*.htm)`
>     HTMFILES = 
>     @for fname in SRCFILES.split()
>     @       htmname = aap_sufreplace('htm', 'html', os.path.basename(fname))
>             HTMFILES += $BDIR/$htmname { publish = $PUBLISH/$htmname }
> 
>     :rule %.html : %.htm
>         :sys $COMPILER -d $SERVER -f $source > $target
> 
> Why is this? 

The rule that a .html file depends on a .html file doesn't work.  It
would get into a deadlock.  Therefore a dependency of a file on itself
is ignored.

If the files are in different directories you should add (part of)
the path to the rule.  For example:

     :rule %.html : source/%.html
         :sys $COMPILER -d $SERVER -f $source > $target

This depends on the length of the matched pattern, thus it is a bit
tricky.  Since you are using a "for" loop anyway, you might as well
specify the dependencies explicitly:

     SRCFILES = `glob(*.html)`
     HTMFILES = 
     @for fname in SRCFILES.split()
     @       htmname = os.path.basename(fname)
	     tname = $BDIR/$htmname
             HTMFILES += $tname { publish = $PUBLISH/$htmname }
             $tname : $fname
		 :sys $COMPILER -d $SERVER -f $source > $target

-- 
Two cows are standing together in a field.  One asks the other:
"So what do you think about this Mad Cow Diesease?"
The other replies: "That doesn't concern me. I'm a helicopter."

 /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
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