checked in: filesystem docs

I have just documented the filesystem components in 
services.os.filesystem; look in 
core/smartfrog/docs/components/filesystem.sxw

There are things to create temp files, get info about files into 
component attributes, delete files on termination, make directories and 
save text to files:

#include "/org/smartfrog/services/filesystem/components.sf"

sfConfig extends Compound {

     sfSyncTerminate true;

     temp1 extends TempFile {
         prefix "encoded";
         suffix ".txt";
     }

     cleanup extends SelfDeletingFile {
         file LAZY temp1;
     }

     textFile extends TextFile {
         file LAZY temp1;
         text "UTF16";
         encoding "utf16";
     }

     //the filename
     absolutePath LAZY textFile:absolutePath;
     //the uri
     uri LAZY textFile:uri;
}

most importantly, all this stuff is platform-independent. You can put a 
string with forward or backslashes into the file attributes and they get 
converted at deployment to the right thing. We even set absolutePath and 
uri attributes afterwards -one for other components, one for setting up 
classpaths.  I've documented how to use the functionality in your own 
tasks, incidentally.

There is a bit more work on these things before they are final, but that 
will be on-demand, as they say. Whoever wants it gets to write the code, 
the tests, the docs.

Back to the XML component...

-steve


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