lunu2mmhg

#!/bin/bash
# This script's framework was created using makescript 
# version v1.0.0, dated 2019-06-01
# Makescript and its accompanying scripts are copyrighted
# by Aetesaki (c) 2018
# 
# lunu2mmhg (c) 2019 aetesaki
#
# ##################################################
# HISTORY:
# ##################################################
#
# * 2019-07-17 - v0.0.0  - First Creation
# * 2019-07-18 - v1.0.0  - release version
# * 2019-08-10 - v1.0.1  - a lunu is 3mm
#
# ##################################################
# Initializing constants and variables
# ##################################################
# Setting constants
version="v1.0.1"            # Sets version variable
lastEdited="2019-08-10"     # Sets last edited variable
[ ! -t 0 ] && pipe=$(cat)   # if stdin is open dump stdin to $pipe
# Declaring variables
declare systolic asystolic temp
# Declare all variables to be used in the script 
# ##################################################
# short help function
# ##################################################
shorthelp() {
    # Edit as required
    cat << EOF
Usage: lunu2mmhg systolic/asystolic
       lunu2mmhg --help
       lunu2mmhg --version"
EOF
}
# ##################################################
# no arguments gives short help
# ##################################################
if [ "$#" == "0" ]; then
	# check if $pipe is empty
	if [ -z "$pipe" ]; then
		# display shorthelp and exit
		shorthelp
		exit 1
	else
		# else set arguments to $pipe
		set -- "$pipe"
	fi
fi 
# ##################################################
# -- help
# ##################################################
if [ "$1" == "--help" ]; then
    shorthelp
    # Write options and explanations
    cat << EOF
   --help                 Displays this text and exit.
   --version              Displays the version of the script and exit.
EOF
    # Write information on arguments afterwards
    # Write examples as required
    exit 0
fi 
# ##################################################
# -- version
# ##################################################
if [ "$1" == "--version" ]; then
    cat << EOF
lunu2mmhg ${version}, dated ${lastEdited}
(c) 2019 aetesaki
EOF
    exit 0
fi
# ##################################################
# Main section
# ##################################################
# Write your script here
# Check for valid argument
if [[ "$1" != *"/"* ]]; then
	echo "No systolic/asystolic separator" >&2
	exit 1
fi
# Grab the parts of the bloodpressure measurement
systolic=$(echo "$1" | cut -d"/" -f1)
asystolic=$(echo "$1" | cut -d"/" -f2)

# Check for valid systolis value
if ! [[ $systolic =~ ^[+-]?[0-9]+([.][0-9]+)?$ ]]; then
	echo "Systolic measurement is not a number" >&2
	exit 1
fi
# check for valid asystolic value
if ! [[ $asystolic =~ ^[+-]?[0-9]+([.][0-9]+)?$ ]]; then
	echo "Asystolic measurement is not a number" >&2
	exit 1
fi

# convert systolic
# convert systolic to testable value
temp=$(awk "BEGIN {print ($systolic*100)}")
# if systolic is 0
if [[ $systolic = 0 ]]; then
	# return normal
	systolic="normal"
# else if systolic is positive
elif [[ $temp -gt 0 ]]; then
	# calculate hypertension
	systolic=$(awk "BEGIN {printf \"%.2f\n\", ($systolic*3)+125}")
# else if systolic is negative
elif [[ $temp -lt 0 ]]; then
	# calculate hypotension
	systolic=$(awk "BEGIN {printf \"%.2f\n\", ($systolic*3)+110}")
fi

# convert asystolic
# convert systolic to testable value
temp=$(awk "BEGIN {print ($asystolic*100)}")
# if asystolic is 0
if [[ $asystolic = 0 ]]; then
	# return normal
	asystolic="normal"
# else if systolic is positive
elif [[ $temp -gt 0 ]]; then
	# calculate hypertension
	asystolic=$(awk "BEGIN {printf \"%.2f\n\", ($asystolic*3)+85}")
# else if systolic is negative
elif [[ $temp -lt 0 ]]; then
	# calculate hypotension
	asystolic=$(awk "BEGIN {printf \"%.2f\n\", ($asystolic*3)+75}")
fi

# export bloodpressure in mmHg
echo "$systolic/$asystolic"