From 2eec09590f0e80828281043da638c4560104b72e Mon Sep 17 00:00:00 2001
From: Owen Dorweiler <homelab@owendor.me>
Date: Sat, 8 Feb 2025 03:53:35 -0500
Subject: [PATCH] Homework 03: zipcode.sh

---
 homework03/zipcode.sh | 69 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100755 homework03/zipcode.sh

diff --git a/homework03/zipcode.sh b/homework03/zipcode.sh
new file mode 100755
index 0000000..10cdd6c
--- /dev/null
+++ b/homework03/zipcode.sh
@@ -0,0 +1,69 @@
+#!/bin/sh
+
+# Globals
+
+URL=https://www.zipcodestogo.com/
+CITY=0
+STATE="Indiana"
+
+# Functions
+
+usage() {
+    cat 1>&2 <<EOF
+Usage: $(basename $0)
+
+-c      CITY    Which city to search
+-s      STATE   Which state to search ($STATE)
+
+If no CITY is specified, then all the zip codes for the STATE are displayed.
+EOF
+    exit $1
+}
+
+zipcode_information() {
+    # Fetch zipcode information from URL based on CITY and STATE
+    curl -sL "$URL$STATE/"
+}
+
+filter_zipcodes() {
+    # Extract zipcodes from zipcode source
+    if [ "$CITY" == "0" ]; then
+       grep -Eo '/[0-9]{5}/' | tr -d '/'
+    else
+       grep -Eo "/$CITY/[a-zA-Z]+/[0-9]{5}/" | grep -Eo '[0-9]{5}'
+    fi
+}
+
+# Parse Command Line Options
+
+while [ $# -gt 0 ]; do
+    case $1 in
+        -s)
+            shift
+	    STATE=()
+            while [ $# -gt 0 ] && [ "${1#-}" = "$1" ]; do
+                STATE+=("$1")
+                shift
+            done
+            
+            STATE="${STATE[*]}"
+            STATE="${STATE// /%20}"
+            ;;
+        -c)
+            shift
+	    CITY=()
+            while [ $# -gt 0 ] && [ "${1#-}" = "$1" ]; do
+                CITY+=("$1")
+                shift
+            done
+            
+            CITY="${CITY[*]}"
+            ;;
+        -h) usage 0;;
+        *)  usage 1;;
+    esac
+done
+
+# Filter Pipeline
+
+zipcode_information | filter_zipcodes