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bash/dnd-character/README.md
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# D&D Character
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For a game of [Dungeons & Dragons][DND], each player starts by generating a
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character they can play with. This character has, among other things, six
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abilities; strength, dexterity, constitution, intelligence, wisdom and
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charisma. These six abilities have scores that are determined randomly. You
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do this by rolling four 6-sided dice and record the sum of the largest three
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dice. You do this six times, once for each ability.
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Your character's initial hitpoints are 10 + your character's constitution
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modifier. You find your character's constitution modifier by subtracting 10
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from your character's constitution, divide by 2 and round down.
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Write a random character generator that follows the rules above.
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For example, the six throws of four dice may look like:
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* 5, 3, 1, 6: You discard the 1 and sum 5 + 3 + 6 = 14, which you assign to strength.
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* 3, 2, 5, 3: You discard the 2 and sum 3 + 5 + 3 = 11, which you assign to dexterity.
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* 1, 1, 1, 1: You discard the 1 and sum 1 + 1 + 1 = 3, which you assign to constitution.
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* 2, 1, 6, 6: You discard the 1 and sum 2 + 6 + 6 = 14, which you assign to intelligence.
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* 3, 5, 3, 4: You discard the 3 and sum 5 + 3 + 4 = 12, which you assign to wisdom.
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* 6, 6, 6, 6: You discard the 6 and sum 6 + 6 + 6 = 18, which you assign to charisma.
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Because constitution is 3, the constitution modifier is -4 and the hitpoints are 6.
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## Notes
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Most programming languages feature (pseudo-)random generators, but few
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programming languages are designed to roll dice. One such language is [Troll].
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[DND]: https://en.wikipedia.org/wiki/Dungeons_%26_Dragons
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[Troll]: http://hjemmesider.diku.dk/~torbenm/Troll/
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Run the tests with:
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```bash
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bats dnd_character_test.sh
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```
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After the first test(s) pass, continue by commenting out or removing the
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`[[ $BATS_RUN_SKIPPED == true ]] || skip`
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annotations prepending other tests.
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To run all tests, including the ones with `skip` annotations, run:
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```bash
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BATS_RUN_SKIPPED=true bats dnd_character_test.sh
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```
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## Source
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Simon Shine, Erik Schierboom [https://github.com/exercism/problem-specifications/issues/616#issuecomment-437358945](https://github.com/exercism/problem-specifications/issues/616#issuecomment-437358945)
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## External utilities
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`Bash` is a language to write "scripts" -- programs that can call
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external tools, such as
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[`sed`](https://www.gnu.org/software/sed/),
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[`awk`](https://www.gnu.org/software/gawk/),
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[`date`](https://www.gnu.org/software/coreutils/manual/html_node/date-invocation.html)
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and even programs written in other programming languages,
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like [`Python`](https://www.python.org/).
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This track does not restrict the usage of these utilities, and as long
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as your solution is portable between systems and does not require
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installation of third party applications, feel free to use them to solve
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the exercise.
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For an extra challenge, if you would like to have a better understanding
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of the language, try to re-implement the solution in pure `Bash`,
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without using any external tools. Note that there are some types of
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problems that bash cannot solve, such as performing floating point
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arithmetic and manipulating dates: for those, you must call out to an
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external tool.
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## Submitting Incomplete Solutions
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It's possible to submit an incomplete solution so you can see how others
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have completed the exercise.
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115
bash/dnd-character/dnd_character.sh
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115
bash/dnd-character/dnd_character.sh
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#!/usr/bin/env bash
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#
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# v1: initial version
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# v2: cleanup, replaced while loops with for loops when possible
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# external tools: none
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# set to 0 to disable log function output, 1 otherwise
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debug=0
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declare -a abilities=( strength dexterity intelligence wisdom charisma constitution )
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usage() {
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echo "dnd_characters.sh generate|modifier <n>" >&2
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exit 1
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}
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# log function takes 1 argument which is echoed if $debug is > 0
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# todo: Add another argument (mask ?) to selectively log portions of code
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log () {
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(( $debug )) && echo "$*"
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}
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# simple bubble sort for numeric array (descending)
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# args: 1: the array
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# todo: add a parameter for asc/desc order.
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sort_n() {
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local -a array=( "$@" )
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local -i max=$(( ${#array[@]} - 1 ))
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for (( max= $(( ${#array[@]} - 1 )); max > 0; max-- )); do
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local -i i
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for (( i=0; i<max; i++ )); do
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local -i val1=${array[$i]}
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local -i val2=${array[$((i + 1))]}
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# switch if necessary
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if (( $val1 < $val2 )); then
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local tmp=$val1
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array[$i]=$val2
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array[$(($i + 1))]=$tmp
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fi
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done
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done
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echo "${array[@]}"
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}
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# roll $2 times a $1 faces dice
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roll() {
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local -a rolls
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local -i i
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for (( i=1; i<=$2; i++ )); do
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rolls[$i]=$((RANDOM % $1 + 1))
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done
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echo ${rolls[@]}
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}
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modifier() {
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local -i res
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local -i in=$1
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local -i out=$(( $in - 10 ))
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log modifier in "$1"
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res=$(( $out / 2 )) # will alwaid round down
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log modifier div "$res"
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# adjust for negative numbers
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(( $out < 0 )) && (( $out % 2 )) && (( res-- ))
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log modifier adjust negative "$res"
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echo $res
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}
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generate() {
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local -i s
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local -a dices
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for ability in ${abilities[@]}; do
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dices=( $(roll 6 4) )
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s=( $(sort_n ${dices[@]}) )
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sum=$(( ${s[1]} + ${s[2]} + ${s[3]} ))
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echo $ability $sum
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if [[ $ability == "constitution" ]]; then
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echo "hitpoints $(( 10 - $(modifier $sum) ))"
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fi
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done
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}
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command="$1"
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case "$command" in
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"modifier")
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(( $# != 2 )) && usage
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modifier "$2"
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;;
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"generate")
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(( $# != 1 )) && usage
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generate
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;;
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*)
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usage
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;;
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esac
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exit 0
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# Indent style for emacs
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# Local Variables:
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# sh-basic-offset: 4
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# sh-indentation: 4
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# indent-tabs-mode: nil
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# comment-column: 60
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# End:
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