From e7b520a2acd14a436bfaf4f8cda780a502ddad08 Mon Sep 17 00:00:00 2001 From: arzzen Date: Sun, 3 Jan 2016 19:30:04 +0100 Subject: [PATCH] pert calculator plugin --- plugins/pert/README.md | 55 +++++++++++++ plugins/pert/pert.plugin.zsh | 145 +++++++++++++++++++++++++++++++++++ 2 files changed, 200 insertions(+) create mode 100644 plugins/pert/README.md create mode 100644 plugins/pert/pert.plugin.zsh diff --git a/plugins/pert/README.md b/plugins/pert/README.md new file mode 100644 index 00000000..603400aa --- /dev/null +++ b/plugins/pert/README.md @@ -0,0 +1,55 @@ +### PERT Calculator + +A simple utility to estimate tasks using PERT (Program evaluation and review technique) + +### Usage +
+A command line PERT calculator for quick estimates.
+
+Comma separated task list in the form "1,2,12 4,5,9 2,3,6", where whitespace separates tasks.
+
+Usage:
+	pert [optimistic,realistic,pessimistic]
+
+Example:
+	pert 1,3,4
+	pert 10,15,20 5,7,10
+	pert "1,2,3" "15,17,20"
+
+ +### Example + +Command: + +`$ pert 5,7,10 2,3,4 10,12,14` + +Output: +
+Tasks
+
+ +--------------------------------------------------------------------------------------+
+ | #            | optimistic | realistic | pessimistic | duration |     risk | variance |
+ +--------------------------------------------------------------------------------------+
+ | 1. task      |          5 |         7 |          10 |     7.16 |     0.83 |     0.68 |
+ | 2. task      |          2 |         3 |           4 |     3.00 |     0.33 |     0.10 |
+ | 3. task      |         10 |        12 |          14 |    12.00 |     0.66 |     0.43 |
+ +--------------------------------------------------------------------------------------+
+ | summary      |          - |         - |           - |    22.16 |     1.82 |     1.21 |
+ +--------------------------------------------------------------------------------------+
+
+Three point estimates
+
+ +----------------------------------------+
+ | confidence    |            |           |
+ +----------------------------------------+
+ | 1 Sigma - 68% |      20.34 |     23.98 |
+ | 2 Sigma - 95% |      18.52 |     25.80 |
+ | 3 Sigma - 99% |      16.70 |     27.62 |
+ +----------------------------------------+
+
+ +### License +[MIT](https://github.com/arzzen/pert/blob/master/LICENSE) + +### Maintainer +[Lukas Mestan](https://github.com/arzzen/) \ No newline at end of file diff --git a/plugins/pert/pert.plugin.zsh b/plugins/pert/pert.plugin.zsh new file mode 100644 index 00000000..41323025 --- /dev/null +++ b/plugins/pert/pert.plugin.zsh @@ -0,0 +1,145 @@ +# +# A simple utility to estimate tasks using PERT +# (Program evaluation and review technique) +# + +alias pert="pert.sh" + +# helper cli calculator +_calc() { + echo "scale=2; $@" | bc -l | sed 's/^\./0./' + return 0 +} + +# divider row +_divider() { + divider=------------------------------ + divider=" +"$divider$divider$divider"+" + printf "%$_width.${_width}s+\n" "$divider" + return 0 +} + +# show help for command list +_help() { + print -P "" + print -P "A command line PERT calculator for quick estimates." + print -P "" + print -P "Comma separated task list in the form \"1,2,12 4,5,9 2,3,6\"," + print -P "where whitespace separates tasks." + print -P "" + print -P "Usage:" + print -P "" + print -P " pert [optimistic,realistic,pessimistic]" + print -P "" + print -P "Example:" + print -P "" + print -P " pert 1,3,4" + print -P " pert 10,15,20 5,7,10" + print -P " pert \"1,2,3\" \"15,17,20\"" + print -P "" + return 0 +} + +# header row +_table_header() { + print -P "" + print -P "Tasks" + print -P "" + _width=88 + _divider + printf "$format" "#" "optimistic" "realistic" "pessimistic" "duration" "risk" "variance" + _divider + return 0 +} + +# footer summary row +_table_footer_sum() { + printf "$format" "summary" "-" "-" "-" $total_estimate $total_standard_deviation $total_variance + _divider + return 0 +} + +# footer 3point row +_table_footer_tpe() { + print -P "" + print -P "Three point estimates" + print -P "" + + _width=42 + tpeformat=" | %-13s |%11s |%10s |\n" + + _divider + printf "$tpeformat" "confidence" + _divider + printf "$tpeformat" "1 Sigma - 68%" $(_calc "$total_estimate - $total_standard_deviation") $(_calc "$total_estimate + $total_standard_deviation") + printf "$tpeformat" "2 Sigma - 95%" $(_calc "$total_estimate - 2 * $total_standard_deviation") $(_calc "$total_estimate + 2 * $total_standard_deviation") + printf "$tpeformat" "3 Sigma - 99%" $(_calc "$total_estimate - 3 * $total_standard_deviation") $(_calc "$total_estimate + 3 * $total_standard_deviation") + _divider + return 0 +} + +# main function +pert() { + + # help text + if [ -z "$1" ] || [[ "$1" =~ [-]*(help|h) ]]; then + _help + return 1 + fi + + format=" | %-12s |%11s |%10s |%12s |%9s |%9s |%9s |\n" + + # header + _table_header + + counter=0 + total_estimate=0 + total_standard_deviation=0 + total_variance=0 + for var in "$@"; do + # counter iterator + counter=$[$counter +1] + + # optimistic value + o=${var[(ws:,:)1]} + + # realistic value + r=${var[(ws:,:)2]} + + # pessimistic value + p=${var[(ws:,:)3]} + + # check values + if [ -z "$o" ] || [ -z "$r" ] || [ -z "$p" ]; then + printf "$format" "$counter. bad input" $o $r $p + else + # pert estimate + pert_estimate=$(_calc "($o+4*$r+$p)/6") + total_estimate=$(_calc "$total_estimate + $pert_estimate") + + # standard deviation + standard_deviation=$(_calc "($p-$o)/6") + total_standard_deviation=$(_calc "$total_standard_deviation + $standard_deviation") + + # variance + variance=$(_calc "$standard_deviation * $standard_deviation") + total_variance=$(_calc "$total_variance + $variance") + + # table row + printf "$format" "$counter. task" $o $r $p $pert_estimate $standard_deviation $variance + fi + done + + _divider + + # footer + if [[ $total_estimate > 0 ]]; then + _table_footer_sum + _table_footer_tpe + fi + + print -P "" + return 0 +} + +unset _width \ No newline at end of file