Elapsed and execution time for commands in ZSH

zsh-elapsed-time.md

Elapsed and execution time display for commands in ZSH

Append this to your ~/.zshrc file.

function preexec() {
  timer=$(($(date +%s%0N)/1000000))
}

function precmd() {
  if [ $timer ]; then
    now=$(($(date +%s%0N)/1000000))
    elapsed=$(($now-$timer))

    export RPROMPT="%F{cyan}${elapsed}ms %{$reset_color%}"
    unset timer
  fi
}

Remixed from @adri's snippet.

bad math expression: operator expected at 'N/1000000'

This happens on MAc because OSX doesn't support milliseconds. You should either remove %N and only get precision close to seconds, or install coreutils as explained here: https://apple.stackexchange.com/questions/135742/time-in-milliseconds-since-epoch-in-the-terminal

Alternatively you can just use 'time [your command here]` to see how long it takes

Just to keep the "quick install" for Mac on this Gist.

Use Homebrew to install coreutils:

brew install coreutils

Then update date to gdate. The snippet becomes:

function preexec() {
  timer=$(($(gdate +%s%0N)/1000000))
}

function precmd() {
  if [ $timer ]; then
    now=$(($(gdate +%s%0N)/1000000))
    elapsed=$(($now-$timer))

    export RPROMPT="%F{cyan}${elapsed}ms %{$reset_color%}"
    unset timer
  fi
}

An easier way to get around this on macOS is to use a prompt expansion format string. (i believe this requires clock_gettime and so it's only available on 10.12+). Additionally I can only seem to get millisecond granularity on mac (zsh should be able to go up to %9. decimal places; in fact zsh aliases %N to %9.):

function preexec() {
  timer=$(($(print -P %D{%s%6.})/1000))
}

function precmd() {
  if [ $timer ]; then
    now=$(($(print -P %D{%s%6.})/1000))
    elapsed=$(($now-$timer))

    export RPROMPT="%F{cyan}${elapsed}ms %{$reset_color%}"
    unset timer
  fi
}

It's pure zsh and this also saves you two forks every execution.

Here's my take on the matter,
uses date +%s%3N to get milliseconds as base unit,
so no need to resort to division and consequent slimmer code:

function preexec() {
  timer=$(date +%s%3N)
}

function precmd() {
  if [ $timer ]; then
    now=$(date +%s%3N)
    elapsed=$(($now-$timer))

    export RPROMPT="%F{cyan}${elapsed}ms %{$reset_color%}"
    unset timer
  fi
}

--

Longer version for the timer to adapt to the command execution length (h/m/s/ms) and always have 3 digits accuracy.
Adapted from https://stackoverflow.com/questions/1862510/how-can-the-last-commands-wall-time-be-put-in-the-bash-prompt

function preexec() {
  timer=$(date +%s%3N)
}

function precmd() {
  if [ $timer ]; then
    local now=$(date +%s%3N)
    local d_ms=$(($now-$timer))
    local d_s=$((d_ms / 1000))
    local ms=$((d_ms % 1000))
    local s=$((d_s % 60))
    local m=$(((d_s / 60) % 60))
    local h=$((d_s / 3600))
    if ((h > 0)); then elapsed=${h}h${m}m
    elif ((m > 0)); then elapsed=${m}m${s}s
    elif ((s >= 10)); then elapsed=${s}.$((ms / 100))s
    elif ((s > 0)); then elapsed=${s}.$((ms / 10))s
    else elapsed=${ms}ms
    fi

    export RPROMPT="%F{cyan}${elapsed} %{$reset_color%}"
    unset timer
  fi
}

The following is perfect for me on macOS:

setopt prompt_subst

function preexec() {
  cmd_start=$(($(print -P %D{%s%6.}) / 1000))
}

function precmd() {
  if [ $cmd_start ]; then
    local now=$(($(print -P %D{%s%6.}) / 1000))
    local d_ms=$(($now - $cmd_start))
    local d_s=$((d_ms / 1000))
    local ms=$((d_ms % 1000))
    local s=$((d_s % 60))
    local m=$(((d_s / 60) % 60))
    local h=$((d_s / 3600))

    if   ((h > 0)); then cmd_time=${h}h${m}m
    elif ((m > 0)); then cmd_time=${m}m${s}s
    elif ((s > 9)); then cmd_time=${s}.$(printf %03d $ms | cut -c1-2)s # 12.34s
    elif ((s > 0)); then cmd_time=${s}.$(printf %03d $ms)s # 1.234s
    else cmd_time=${ms}ms
    fi

    unset cmd_start
  else
    # Clear previous result when hitting Return with no command to execute
    unset cmd_time
  fi
}

RPROMPT='%F{16}$(if [ $cmd_time ]; then echo "($cmd_time) "; fi)$(date "+%F %T %z")%F{none}'

The relevant variable is cmd_time. The full RPROMPT also contains the current date and time.

Here's a code that uses more features from Zsh, a refactoring of the code by @rafbm. No command substitutions are used.

zmodload zsh/datetime

prompt_preexec() {
  prompt_prexec_realtime=${EPOCHREALTIME}
}

prompt_precmd() {
  if (( prompt_prexec_realtime )); then
    local -rF elapsed_realtime=$(( EPOCHREALTIME - prompt_prexec_realtime ))
    local -rF s=$(( elapsed_realtime%60 ))
    local -ri elapsed_s=${elapsed_realtime}
    local -ri m=$(( (elapsed_s/60)%60 ))
    local -ri h=$(( elapsed_s/3600 ))
    if (( h > 0 )); then
      printf -v prompt_elapsed_time '%ih%im' ${h} ${m}
    elif (( m > 0 )); then
      printf -v prompt_elapsed_time '%im%is' ${m} ${s}
    elif (( s >= 10 )); then
      printf -v prompt_elapsed_time '%.2fs' ${s} # 12.34s
    elif (( s >= 1 )); then
      printf -v prompt_elapsed_time '%.3fs' ${s} # 1.234s
    else
      printf -v prompt_elapsed_time '%ims' $(( s*1000 ))
    fi
    unset prompt_prexec_realtime
  else
    # Clear previous result when hitting ENTER with no command to execute
    unset prompt_elapsed_time
  fi
}

setopt nopromptbang prompt{cr,percent,sp,subst}

autoload -Uz add-zsh-hook
add-zsh-hook preexec prompt_preexec
add-zsh-hook precmd prompt_precmd

RPS1='%F{cyan}${prompt_elapsed_time}%F{none}'

How come you don't just use the timer plugin for oh-my-zshell? Just curious.

<3 @mezza

Is it possible to add this execution time at the rear of the first line like the style of Spaceship Prompt?

Dumb question but whats the math for getting this in seconds? Change 1000000 to 1000?

<3 @jututt

Dumb question but whats the math for getting this in seconds? Change 1000000 to 1000?

Here is the same snippet as above, but it displays as seconds with 3 decimals

function preexec() {
  timer=$(($(date +%s%0N)*0.000000001))
}

function precmd() {
  if [ $timer ]; then
    now=$(($(date +%s%0N)*0.000000001))
    elapsed=$(echo $(($now-$timer)) | awk '{printf "%.3f", $1}')

    export RPROMPT="%F{cyan}${elapsed}s %{$reset_color%}"
    unset timer
  fi
}

  cmd_start=$(($(print -P %D{%s%6.}) / 1000))

Why not simply use the following?

  cmd_start=$(print -P %D{%s%3.})

No need to ask for microsecs and then divide by 1000, if you can get millisecs directly...

I wanted slightly more accuracy, and the time on the left of the normal prompt, so I've changed the code of rafbm to this (works on macos 13):

myprompt="%B%F{cyan}%n@%m:%d/ %h%(!.#.>)%f%b"

function preexec() {
  timer=$(print -P %D{%s%3.})
}

function precmd() {
  timeprompt=""	
  if [ $timer ]; then
    now=$(print -P %D{%s%3.})
    local d_ms=$(($now - $timer))
    local d_s=$((d_ms / 1000))
    local ms=$((d_ms % 1000))
    local s=$((d_s % 60))
    local m=$(((d_s / 60) % 60))
    local h=$((d_s / 3600))

    if   ((h > 0)); then timeprompt=${h}h${m}m${s}s
    elif ((m > 0)); then timeprompt=${m}m${s}.$(printf $(($ms / 100)))s # 1m12.3s
    elif ((s > 9)); then timeprompt=${s}.$(printf %02d $(($ms / 10)))s # 12.34s
    elif ((s > 0)); then timeprompt=${s}.$(printf %03d $ms)s # 1.234s
    else timeprompt=${ms}ms
    fi
    timeprompt="%B%F{yellow}${timeprompt} %f%b"
    unset timer
  fi
  export PS1=${timeprompt}${myprompt}
}