[Omake] Deciding when a file has changed

[Jason Hickey]

Hi Jared,

Is it possible to extract the name of the program from the script?   
That way, you could add it as a scanner dependency, and things would  
work correctly.  Here is an example, where I'm generating a file  
called "foo" by executing the "myscript" shell script.

     # Figure out the actual dependencies for foo by scanning the script
     .SCANNER: scan-foo: myscript
         section
             dep =
             awk(myscript)
             case $'# the name you are looking for is: \([A-Za-z0-9]+\)'
                 dep = $1
                 export
             if $(dep)
                 println($"foo: $(dep)")

     # Specify the custom scanner
     foo: myscript :scanner: scan-foo
         myscript

     .DEFAULT: foo

In this case, I'm using the awk function to look for a string in the  
script, but you can do anything you want, like running the script in  
some mode that prints what it would do without actually executing  
it.  In the .SCANNER rule, you just need to print out a line  
"<target>: <dependencies>" with the actual dependencies.

Jason

On Apr 25, 2007, at 11:42 AM, Jared C. Davis wrote:

> Hi,
>
> Is there a way to tell Omake to use a particular file's modified date,
> instead of its contents, to decide if it has changed?
>
> I have a shell script whose contents do not change, but the program it
> invokes has been updated.  Normally I would just add a dependency on
> this program, but in this case I don't want to do that since, for
> stupid reasons beyond my control, the program's name is not the same
> across different platforms.
>
> Thanks,
>   Jared
>
> -- 
> Jared C. Davis <jared at cs.utexas.edu>
> 3600 Greystone Drive #604
> Austin, TX 78731
> http://www.cs.utexas.edu/users/jared/
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--
Jason Hickey                  http://www.cs.caltech.edu/~jyh
Caltech Computer Science      Tel: 626-395-6568 FAX: 626-792-4257