user/mc_distance_calc.sh

   1 #!/usr/bin/env bash
   2 # Desc: Calculates distances between two minecraft coordinates
   3 # Depends: bash 5.1.16, bc 1.07.1
   4 # Depends: BK-2020-03: yell(), die(), must()
   5 # Version: 0.0.2
   6 # Example: script.sh 0 0 0 1 1 1
   7 #   Note: results in xyz distance of 1.73205…
   8
   9 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
  10 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
  11 must() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
  12 checkFlt() {
  13     # Desc: Checks if arg is a float
  14     # Usage: checkFlt arg
  15     # Input: arg: float
  16     # Output: - return code 0 (if arg is float)
  17     #         - return code 1 (if arg is not float)
  18     # Example: if ! checkFlt $arg; then echo "not flt"; fi;
  19     # Version: 0.0.2
  20     # Depends: yell(), die(), bash 5.0.3
  21     # Ref/Attrib: JDB https://stackoverflow.com/a/12643073 float regex
  22     local returnState
  23
  24     #===Process Arg===
  25     if [[ $# -ne 1 ]]; then
  26         die "ERROR:Invalid number of arguments:$#";
  27     fi;
  28
  29     RETEST1='^[+-]?([0-9]+([.][0-9]*)?|[.][0-9]+)$'; # Regular Expression to test
  30     if [[ ! $1 =~ $RETEST1 ]] ; then
  31         returnState="false";
  32     else
  33         returnState="true";
  34     fi;
  35
  36     #===Determine function return code===
  37     if [ "$returnState" = "true" ]; then
  38         return 0;
  39     else
  40         return 1;
  41     fi;
  42 } # Checks if arg is float
  43 main() {
  44     x1="$1"; y1="$2"; z1="$3";
  45     x2="$4"; y2="$5"; z2="$6";
  46     #declare -p x1 y1 z1 x2 y2 z2; # debug
  47
  48     # Check inputs
  49     if ! checkFlt "$x1"; then die "FATAL:Not a float:$x1"; fi;
  50     if ! checkFlt "$y1"; then die "FATAL:Not a float:$y1"; fi;
  51     if ! checkFlt "$z1"; then die "FATAL:Not a float:$z1"; fi;
  52     if ! checkFlt "$x2"; then die "FATAL:Not a float:$x2"; fi;
  53     if ! checkFlt "$y2"; then die "FATAL:Not a float:$y2"; fi;
  54     if ! checkFlt "$z2"; then die "FATAL:Not a float:$z2"; fi;
  55
  56     # Calculate distances
  57     dist_xyz_eq="sqrt( ($x2 - $x1)^2 + ($y2 - $y1)^2 + ($z2 - $x1)^2 )";
  58     dist_xyz="$(printf "%s\n" "$dist_xyz_eq" | bc -l;)";
  59     #declare -p dist_xyz_eq dist_xyz; # debug
  60
  61     dist_xz_eq=" sqrt( ($x2 - $x1)^2 + ($z2 - $z1)^2 ) ";
  62     dist_xz="$(printf "%s\n" "$dist_xz_eq" | bc -l;)";
  63     declare -p dist_xz_eq dist_xz; # debug
  64
  65     printf "dist_xyz:%s\n" "$dist_xyz";
  66     printf "dist_xz:%s\n" "$dist_xz";
  67 }; # Main program
  68
  69 main "$@";