Homework 03: weather.sh

homework03/weather.sh

@@ -0,0 +1,60 @@
+#!/bin/sh
+
+# Globals
+
+URL="https://forecast.weather.gov/zipcity.php"
+ZIPCODE=46556
+FORECAST=0
+CELSIUS=0
+
+# Functions
+
+usage() {
+    cat 1>&2 <<EOF
+Usage: $(basename $0) [zipcode]
+
+-c    Use Celsius degrees instead of Fahrenheit for temperature
+-f    Display forecast text after the temperature
+
+If zipcode is not provided, then it defaults to $ZIPCODE.
+EOF
+    exit $1
+}
+
+weather_information() {
+    # Fetch weather information from URL based on ZIPCODE
+    curl -sL "$URL?inputstring=$ZIPCODE"
+}
+
+temperature() {
+    # Extract temperature information from weather source
+    if [ $CELSIUS -eq 0 ]; then
+    	weather_information | grep -Eo '\-?[0-9]{1,3}&deg;F<' | sed 's/&deg;F<//'
+    else
+	weather_information | grep -Eo '\-?[0-9]{1,3}&deg;C<' | sed 's/&deg;C<//'
+    fi
+}
+
+forecast() {
+    # Extract forecast information from weather source
+    weather_information | grep -Eo '"myforecast-current">.*?<' | sed 's/"myforecast-current">//g; s/<//g; s/^[[:space:]]*//; s/[[:space:]]*$//'
+}
+
+# Parse Command Line Options
+
+while [ $# -gt 0 ]; do
+    case $1 in
+    	-c) CELSIUS=1;;
+	-f) FORECAST=1;;
+        -h) usage 0;;
+	*) ZIPCODE=$1;
+    esac
+    shift
+done
+
+# Display Information
+
+echo "Temperature: $(temperature) degrees"
+if [ $FORECAST -eq 1 ]; then
+   echo "Forecast:    $(forecast)"
+fi