I've attached a patch that implements logging with a new command, log-pane or logp. A -b flag will begin logging for the pane, -e will end it, and -o will toggle it on/off, similar to pipe-pane. You can specify the filename with -f, but if you don't, there's a default that's set to "~/tmux-#S-#I-#P.log" with a logpane-default-logname session option.
Logging can be made to happen automatically when a new pane is created by setting the session option logpane-autolog to 1. It defaults to off, though. In order to allow things like #S and #P in the filename I had to alter status_replace(). That function required a non-NULL client variable, which won't always be available when setting the filename. I altered it so that it will accept a NULL client. If client is non-NULL, it'll behave as before. With a NULL, it'll use s, wl, and wp to replace what it can. I also added a function to cmd-string.c called cmd_string_expand_path(). This expands a tilde or $var in the filename. While cmd_string_parse() can do this, it leads to odd quoting needs in conjunction with the status formatting. If you enter ~/file-#P (no quotes), then the #P gets chopped off because it's assumed to start a comment. If you enter "~/file-#P" then cmd_string_parse() won't expand the tilde. You'd have to get around it by doing ~/file-"#P". With the patch, each pane gets a logging filename and file descriptor, initially set to NULL and -1. Only when logging is turned on for the pane will the filename be set, and fd set to the return from open().
log-pane.patch
Description: Binary data
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