pert calculator plugin
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plugins/pert/README.md
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plugins/pert/README.md
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### PERT Calculator
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A simple utility to estimate tasks using PERT (Program evaluation and review technique)
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### Usage
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<pre>
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A command line PERT calculator for quick estimates.
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Comma separated task list in the form "1,2,12 4,5,9 2,3,6", where whitespace separates tasks.
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Usage:
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pert [optimistic,realistic,pessimistic]
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Example:
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pert 1,3,4
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pert 10,15,20 5,7,10
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pert "1,2,3" "15,17,20"
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</pre>
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### Example
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Command:
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`$ pert 5,7,10 2,3,4 10,12,14`
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Output:
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<pre>
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Tasks
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+--------------------------------------------------------------------------------------+
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| # | optimistic | realistic | pessimistic | duration | risk | variance |
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+--------------------------------------------------------------------------------------+
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| 1. task | 5 | 7 | 10 | 7.16 | 0.83 | 0.68 |
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| 2. task | 2 | 3 | 4 | 3.00 | 0.33 | 0.10 |
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| 3. task | 10 | 12 | 14 | 12.00 | 0.66 | 0.43 |
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+--------------------------------------------------------------------------------------+
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| summary | - | - | - | 22.16 | 1.82 | 1.21 |
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+--------------------------------------------------------------------------------------+
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Three point estimates
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+----------------------------------------+
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| confidence | | |
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+----------------------------------------+
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| 1 Sigma - 68% | 20.34 | 23.98 |
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| 2 Sigma - 95% | 18.52 | 25.80 |
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| 3 Sigma - 99% | 16.70 | 27.62 |
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+----------------------------------------+
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</pre>
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### License
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[MIT](https://github.com/arzzen/pert/blob/master/LICENSE)
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### Maintainer
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[Lukas Mestan](https://github.com/arzzen/)
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145
plugins/pert/pert.plugin.zsh
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plugins/pert/pert.plugin.zsh
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#
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# A simple utility to estimate tasks using PERT
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# (Program evaluation and review technique)
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#
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alias pert="pert.sh"
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# helper cli calculator
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_calc() {
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echo "scale=2; $@" | bc -l | sed 's/^\./0./'
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return 0
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}
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# divider row
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_divider() {
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divider=------------------------------
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divider=" +"$divider$divider$divider"+"
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printf "%$_width.${_width}s+\n" "$divider"
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return 0
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}
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# show help for command list
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_help() {
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print -P ""
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print -P "A command line PERT calculator for quick estimates."
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print -P ""
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print -P "Comma separated task list in the form \"1,2,12 4,5,9 2,3,6\","
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print -P "where whitespace separates tasks."
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print -P ""
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print -P "Usage:"
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print -P ""
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print -P " pert [optimistic,realistic,pessimistic]"
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print -P ""
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print -P "Example:"
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print -P ""
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print -P " pert 1,3,4"
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print -P " pert 10,15,20 5,7,10"
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print -P " pert \"1,2,3\" \"15,17,20\""
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print -P ""
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return 0
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}
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# header row
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_table_header() {
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print -P ""
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print -P "Tasks"
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print -P ""
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_width=88
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_divider
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printf "$format" "#" "optimistic" "realistic" "pessimistic" "duration" "risk" "variance"
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_divider
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return 0
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}
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# footer summary row
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_table_footer_sum() {
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printf "$format" "summary" "-" "-" "-" $total_estimate $total_standard_deviation $total_variance
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_divider
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return 0
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}
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# footer 3point row
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_table_footer_tpe() {
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print -P ""
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print -P "Three point estimates"
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print -P ""
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_width=42
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tpeformat=" | %-13s |%11s |%10s |\n"
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_divider
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printf "$tpeformat" "confidence"
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_divider
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printf "$tpeformat" "1 Sigma - 68%" $(_calc "$total_estimate - $total_standard_deviation") $(_calc "$total_estimate + $total_standard_deviation")
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printf "$tpeformat" "2 Sigma - 95%" $(_calc "$total_estimate - 2 * $total_standard_deviation") $(_calc "$total_estimate + 2 * $total_standard_deviation")
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printf "$tpeformat" "3 Sigma - 99%" $(_calc "$total_estimate - 3 * $total_standard_deviation") $(_calc "$total_estimate + 3 * $total_standard_deviation")
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_divider
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return 0
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}
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# main function
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pert() {
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# help text
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if [ -z "$1" ] || [[ "$1" =~ [-]*(help|h) ]]; then
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_help
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return 1
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fi
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format=" | %-12s |%11s |%10s |%12s |%9s |%9s |%9s |\n"
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# header
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_table_header
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counter=0
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total_estimate=0
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total_standard_deviation=0
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total_variance=0
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for var in "$@"; do
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# counter iterator
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counter=$[$counter +1]
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# optimistic value
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o=${var[(ws:,:)1]}
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# realistic value
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r=${var[(ws:,:)2]}
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# pessimistic value
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p=${var[(ws:,:)3]}
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# check values
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if [ -z "$o" ] || [ -z "$r" ] || [ -z "$p" ]; then
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printf "$format" "$counter. bad input" $o $r $p
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else
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# pert estimate
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pert_estimate=$(_calc "($o+4*$r+$p)/6")
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total_estimate=$(_calc "$total_estimate + $pert_estimate")
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# standard deviation
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standard_deviation=$(_calc "($p-$o)/6")
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total_standard_deviation=$(_calc "$total_standard_deviation + $standard_deviation")
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# variance
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variance=$(_calc "$standard_deviation * $standard_deviation")
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total_variance=$(_calc "$total_variance + $variance")
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# table row
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printf "$format" "$counter. task" $o $r $p $pert_estimate $standard_deviation $variance
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fi
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done
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_divider
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# footer
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if [[ $total_estimate > 0 ]]; then
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_table_footer_sum
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_table_footer_tpe
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fi
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print -P ""
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return 0
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}
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unset _width
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