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zero elapsed time in history with certain preexec functions
- X-seq: zsh-workers 24320
- From: Michael Kaminsky <kaminsky@xxxxxxxxxxxxx>
- To: zsh-workers@xxxxxxxxxx
- Subject: zero elapsed time in history with certain preexec functions
- Date: Tue, 25 Dec 2007 14:07:25 -0500
- Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm
I sent this message to zsh-users in August, but didn't see any response.
In case it fell through the cracks, I'm re-sending to zsh-workers. Can
anyone say if this is a bug? Is there a fix or work-around?
Note: I re-tested everything below with "zsh -f" and the behavior is the
same. After "zsh -f" you need to "setopt" the options list in the first
example: extendedhistory histignoredups histignorespace histnostore.
Please CC me on any responses as I'm not on the list.
Thanks,
Michael
-------------------------------------------------
I use zsh's preexec function to set the title of my terminal, similar to
many of the examples posted online. After defining preexec, however, I
noticed that zsh wasn't recording the duration of commands anymore.
After much experimentation, I believe I've come up some simple examples
to illustrate this behavior:
$ zsh --version
zsh 4.3.4 (i686-pc-linux-gnu)
$ setopt|grep hist
extendedhistory
histignoredups
histignorespace
histnostore
$ unfunction preexec
$ sleep 2
$ fc -ldD |tail -1
12004 11:16 0:02 sleep 2
(so far, so good)
$ function preexec { echo $ZSH_VERSION }
$ sleep 2
4.3.4
$ fc -ldD |tail -1
4.3.4
12014 11:18 0:02 sleep 2
(still good, but...)
$ function preexec { echo $ZSH_VERSION[1] }
4.3.4
$ sleep 2
4
$ fc -ldD |tail -1
4
12016 11:20 0:00 sleep 2
It appears that subscripting a variable (or indexing into a zsh array)
inside of the preexec function causes zsh not to record the elapsed
time/duration of the command. There may be other actions that trigger
this behavior. Another quick example:
$ function preexec() { echo $1 }
$ sleep 2
sleep 2
$ fc -ldD |tail -1
fc -ldD |tail -1
12040 11:25 0:02 sleep 2
(but...)
$ function preexec() { echo ${(z)1} }
function preexec() { echo ${(z)1} }
$ sleep 2
sleep 2
$ fc -ldD |tail -1
fc -ldD | tail -1
12044 11:27 0:00 sleep 2
Any ideas?
Michael
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