How can you get zsh's REPORTTIME variable to print the command that ran? - profiling

Question

Setting the $REPORTTIME variable in zsh will cause zsh to print the time of commands that run for longer than the value of the environment variable.
However all you get is the time, when I set it in my .zshrc I got:
0.00s user 0.00s system 25% cpu 0.001 total
0.00s user 0.00s system 75% cpu 0.003 total
0.00s user 0.00s system 30% cpu 0.002 total
0.00s user 0.00s system 77% cpu 0.003 total
0.00s user 0.00s system 34% cpu 0.001 total
0.00s user 0.00s system 87% cpu 0.003 total
0.00s user 0.00s system 48% cpu 0.001 total
0.00s user 0.00s system 86% cpu 0.002 total
0.00s user 0.01s system 88% cpu 0.014 total
0.00s user 0.00s system 11% cpu 0.014 total
0.00s user 0.01s system 85% cpu 0.016 total
0.00s user 0.00s system 20% cpu 0.016 total
0.00s user 0.00s system 82% cpu 0.007 total
This isn't too helpful as it doesn't tell you what is being slow. Is there a way to also print the command that caused $REPORTTIME to trigger?

Answer 1

You can use setopt xtrace to have each command printed before it is executed. Combined with REPORTTIME, this should give you the information you need. You need to put setopt xtrace inside the script(s) you want to monitor.
For example, take this shell script named test:
#!/bin/zsh
setopt xtrace
ls foo
ls bar
ls baz
unsetopt xtrace
Running the script (with REPORTTIME set) results in:
% ./test
+./test:3> ls foo
ls: cannot access foo: No such file or directory
0.00s user 0.00s system 2% cpu 0.154 total
+./test:4> ls bar
ls: cannot access bar: No such file or directory
0.00s user 0.00s system 0% cpu 0.005 total
+./test:5> ls baz
ls: cannot access baz: No such file or directory
0.00s user 0.00s system 0% cpu 0.008 total
+./test:6> unsetopt xtrace
./test 0.01s user 0.00s system 1% cpu 0.758 total