mmhg2lunu

#!/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
# 
# mmhg2lunu (c) 2019 aetesaki
#
# ##################################################
# HISTORY:
# ##################################################
#
# * 2019-07-17 - v0.0.0  - First Creation
# * 2019-07-17 - v0.0.1  - added piping
# * 2019-07-17 - v1.0.0  - release version
# * 2019-07-18 - v1.0.1  - error corrections
# * 2019-08-10 - v1.0.2  - a lunu is 3mm
#
# ##################################################
# Initializing constants and variables
# ##################################################
# Setting constants
version="v1.0.2"            # Sets version variable
lastEdited="2019-08-10"     # Sets last edited variable
[ ! -t 0 ] && pipe=$(cat)   # if stdin is open dump stdin to $pipe
# Declaring variables
declare systolic asystolic temp
# Declare all variables to be used in the script 
# ##################################################
# short help function
# ##################################################
shorthelp() {
    # Edit as required
    cat << EOF
Usage: mmhg2lunu systolic/asystolic
       mmhg2lunu --help
       mmhg2lunu --version"
EOF
}
# ##################################################
# no arguments gives short help
# ##################################################
if [ "$#" == "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
mmhg2lunu ${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 above baseline
if [[ $temp -gt 12500 ]]; then 
	# then compute hypertention
	systolic=$(awk "BEGIN {printf \"%.2f\n\", ($systolic-125)/3}")
# else if systolic is below baseline
elif [[ $temp -lt 11000 ]]; then
	# then compute hypotention
	systolic=$(awk "BEGIN {printf \"%.2f\n\", ($systolic-110)/3}")
# else use baseline
else
	systolic=0
fi

# convert asystolic
# convert systolic to testable value
temp=$(awk "BEGIN {print ($asystolic*100)}")
# if asystolic is above baseline
if [[ $temp -gt 8500 ]]; then 
	# then compute hypotention
	asystolic=$(awk "BEGIN {printf \"%.2f\n\", ($asystolic-85)/3}")
# else if asystolic is below baseline
elif [[ $temp -lt 7500 ]]; then
	# then compute hypotention
	asystolic=$(awk "BEGIN {printf \"%.2f\n\", ($asystolic-75)/3}")
# else use baseline
else
	asystolic=0
fi

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