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Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

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Time-switching Procmailrc Recipe

From: andrew cooke <andrew@...>

Date: Wed, 7 Mar 2012 21:30:06 -0300

This is really ugly, but it's simple and appears to work.

Take two files - .procmailrc-foo-on and .procmailrc-foo-off - and place in
them the procmail commands you want to switch between.  For example, you might
want to filter work-related emails over the weekend so that they go into a
separate folder; that might be in .procmailrc-foo-off while .procmailrc-foo-on
remains blank.

Next, in crontab, define two commands:

  x x x x x rm /home/andrew/.procmailrc-foo; \
   ln -s /home/andrew/.procmailrc-foo-on /home/andrew/.procmailrc-foo

  x x x x x rm /home/andrew/.procmailrc-foo; \
   ln -s /home/andrew/.procmailrc-foo-off /home/andrew/.procmailrc-foo

(those are each single line commands, wrapped for this blog).  One turns the
filter "on" and the other "off" by updating the link.

Finally, in your .procmailrc, include

  INCLUDERC=.procmailrc-foo

And the message filtering will swap as required.  There's an unfortunate "gap"
when the switching occurs, but at least in my case I time that to not
conincide with the email download heartbeat from my ISP.

Andrew

Small Corrections

From: andrew cooke <andrew@...>

Date: Wed, 7 Mar 2012 21:54:35 -0300

1 - You need the absolute path in the INCLUDERC (at least, that makes life
    simpler)

2 - If INCLUDERC can't find the file, procmail continues just fine, so if one
    of the two files you are switching between is empty, you could just delete
    the link.

Andrew

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