Display command execution time about bash-preexec HOT 7 CLOSED

elementz@Kashmir:~/git/bashhub (master)$ uname -a
Linux Kashmir 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
elementz@Kashmir:~/git/bashhub (master)$ echo $BASH_VERSION 
4.3.11(1)-release
elementz@Kashmir:~/git/bashhub (master)$ bash --version
GNU bash, version 4.3.11(1)-release (x86_64-pc-linux-gnu)

elementz@Kashmir:~/git/bashhub (master)$ preexec () {
     date_before=$(date +%s.%N)
 }
elementz@Kashmir:~/git/bashhub (master)$ 

elementz@Kashmir:~/git/bashhub (master)$ precmd () {
     if [ -z "$date_before" ]; then
         return 0
     fi

     local date_after
     date_after=$(date +%s.%N)
     printf "\n%.2fs\n\n" $(bc<<<$date_after-$date_before)
}
elementz@Kashmir:~/git/bashhub (master)$ sleep 1

1.01s

elementz@Kashmir:~/git/bashhub (master)$ echo "$PROMPT_COMMAND"
__bp_precmd_invoke_cmd;  __bp_interactive_mode;

❯ echo "$PROMPT_COMMAND"
__bp_precmd_invoke_cmd; history -a; echo -ne "\\033]0;${PWD##*\/}\\007"; __bp_interactive_mode;
_z --add "$(command pwd -P 2>/dev/null)" 2>/dev/null;

3.61s

❯ set -o verbose
__bp_precmd_invoke_cmd; history -a; echo -ne "\\033]0;${PWD##*\/}\\007"; __bp_interactive_mode;
__bp_preexec_invoke_exec
type -t $precmd_function
date +%s.%N
bc<<<$date_after-$date_before

37.54s

__bp_preexec_invoke_exec
__bp_preexec_invoke_exec
__bp_preexec_invoke_exec
_z --add "$(command pwd -P 2>/dev/null)" 2>/dev/null;
__bp_preexec_invoke_exec
__bp_trim_whitespace "$1"
__bp_trim_whitespace "$command"
__bp_trim_whitespace "$command"
__bp_trim_whitespace "$command"
__bp_trim_whitespace "$command"
__bp_trim_whitespace "$command"
history 1 | sed -e "s/^[ ]*[0-9]*[ ]*//g"
type -t $preexec_function
date +%s.%N
command pwd -P 2>/dev/null
[[ -n $(git branch 2> /dev/null) ]] && echo " "
git branch 2> /dev/null
parse_git_branch
git rev-parse --abbrev-ref HEAD  2> /dev/null

19:32:38-rcaloras-~$ echo $PROMPT_COMMAND 
__bp_precmd_invoke_cmd; _z --add "$(command pwd -P 2>/dev/null)" 2>/dev/null; __bp_interactive_mode;