A plugin to run a command line program for every displayed page

[omry]

I am working on a php statistics system called ​FireStats and I would like to use it to monitor trac usage. I require a plugin that will allow me to excute a commnad line program for every displayed page. that alone would be a great start, but it will be even better if it will include some sort of macro support: the command line to execute (which should of course come from the configuration file) may contain special constants which will be replaced by run time parameters, for example: %REMOTE_ADDR = the ip address of the remote user %REFERER = the referer of the current user %USER_AGENT = the user agent of the user %REQUEST_URI = the requested page uri and so on, as required by users. those will be used like this: [prog_exec] cmd=php -r "echo %REMOTE_ADDR;"

the plugin will replace %REMOTE_ADDR with the ip of the current user. etc.

[Noah Kantrowitz]

This is trivial to write as a pre/post request filter, but I think the performance hit would be prohibitive.

[figaro]

See also FireStatsPlugin