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https://github.com/ohmyzsh/ohmyzsh.git
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70 lines
2.5 KiB
Bash
70 lines
2.5 KiB
Bash
#!/usr/bin/env zsh
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## nanotimer - Oh-My-Zsh plugin
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##
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## Utilizes the 'preexec' and 'precmd' hooks. Timer is setup during 'preexec', and stopped at
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## 'precmd'. This time difference is very accurate, and is displayed in the right prompt.
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##
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## More information about hooks like 'preexec' and 'precmd', and many others:
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## https://zsh.sourceforge.io/Doc/Release/Functions.html#index-hook-functions
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## * __exectimer_preexec()
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## Executed just after a command has been read and is about to be executed. This hook is used to
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## start a high-precision timer before command execution. Additional tasks can be completed in this
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## function; for example, update active network interface. By doing that here, it ensures the
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## network interface stays updated.
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__exectimer_preexec() {
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timer=$(($(date +%s%0N)))
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}
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## * __exectimer_precmd()
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## Executed before each prompt, or in other words, after previous command. Stops the timer from
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## 'preexec', and updates rprompt with elapsed time. This is modified for higher precision from the
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## following code snippet: https://gist.github.com/knadh/123bca5cfdae8645db750bfb49cb44b0
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__exectimer_precmd() {
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if [ $timer ]; then
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now=$(($(date +%s%0N)))
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elapsed=$(($now-$timer))
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# Unset elapsed variables to make below syntax work (work-around to prevent more work)
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unset elns elmcs elms els
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# Depending on digits in nanoseconds, set the elapsed milliseconds, seconds etc.
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# I should document this more later as ZSH syntax is kinda weird sometimes.
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case ${#elapsed} in
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[0-3])
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elns=$elapsed
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;;
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[4-6])
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elapsed=${elapsed%${elns=${elapsed:(-3):3}}}
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elmcs=$elapsed
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;;
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[7-9])
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elapsed=${elapsed%${elns=${elapsed:(-3):3}}}
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elapsed=${elapsed%${elmcs=${elapsed:(-3):3}}}
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elms=$elapsed
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;;
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*)
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elapsed=${elapsed%${elns=${elapsed:(-3):3}}}
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elapsed=${elapsed%${elmcs=${elapsed:(-3):3}}}
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elapsed=${elapsed%${elms=${elapsed:(-3):3}}}
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els=$elapsed
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;;
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esac
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# Zero values for all, when e.g. under a second execution.
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for v in elns elmcs elms els; do
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[[ ! "${(P)v}" =~ ^[0-9]+$ ]] && read $v <<< $((0))
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done
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# Set right prompt and reset timer.
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export RPROMPT="%(?.%F{195}[%?].%S%B%F{009}[%?]%b%s) %F{215}%B${els}%b%F{250}s %F{192}%B${elms}%b%F{250}ms %F{194}%B${elmcs}%b%F{250}μs %F{231}%B${elns}%b%F{250}ns%{$reset_color%}"
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unset timer
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fi
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}
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# Add functions to Zsh hooks.
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autoload -U add-zsh-hook
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add-zsh-hook preexec __exectimer_preexec
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add-zsh-hook precmd __exectimer_precmd
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