Extract magic strings into named constants

Define pattern constants at the top of the script for:
- VIRTUAL_IFACE_PATTERN: virtual/firewall interface patterns
- STORAGE_CONTROLLER_PATTERN: HBA/storage controller detection
- DISK_DEVICE_PATTERN: disk device name patterns
- EXCLUDED_PCI_PATTERN: PCI devices to exclude from listing

This improves maintainability and makes patterns easier to modify.

#12

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

proxDoc.sh

@@ -7,6 +7,18 @@ VERSION="1.1.0"
 ###################
 readonly CMD_TIMEOUT=30  # Default timeout in seconds for external commands
 
+###################
+# Pattern Constants
+###################
+# Virtual/firewall interface patterns to skip
+readonly VIRTUAL_IFACE_PATTERN="^(veth|fwbr|fwln|fwpr|tap)"
+# Storage controller patterns for HBA detection
+readonly STORAGE_CONTROLLER_PATTERN="RAID|SAS|SATA|SCSI|Mass storage|Serial Attached|Fibre Channel|NVMe"
+# Disk device patterns
+readonly DISK_DEVICE_PATTERN="^sd|^nvme"
+# PCI devices to exclude from hardware info
+readonly EXCLUDED_PCI_PATTERN="Host bridge|PCI bridge|ISA bridge|SMBus|IOMMU|Dummy|USB controller|Audio device|Encryption controller|Multimedia controller"
+
 ###################
 # Color Definitions
 ###################
@@ -113,7 +125,7 @@ get_disk_health() {
             if ! timeout $CMD_TIMEOUT smartctl -H "/dev/$disk"; then
                 log_message warn "smartctl timed out or failed for /dev/$disk"
             fi
-        done < <(lsblk -d -o name | grep -E '^sd|^nvme')
+        done < <(lsblk -d -o name | grep -E "$DISK_DEVICE_PATTERN")
     else
         log_message warn "smartctl not found. Install smartmontools for disk health monitoring"
     fi
@@ -181,7 +193,7 @@ get_hardware_info() {
     echo -e "${GREEN}BIOS Version:${NC} $(dmidecode -s bios-version)"
     echo -e "\n${GREEN}=== PCI Devices ===${NC}"
     # Show interesting devices, exclude bridges, infrastructure, and integrated motherboard devices
-    lspci | grep -v -E "Host bridge|PCI bridge|ISA bridge|SMBus|IOMMU|Dummy|USB controller|Audio device|Encryption controller|Multimedia controller"
+    lspci | grep -v -E "$EXCLUDED_PCI_PATTERN"
 }
 
 get_motherboard_info() {
@@ -358,7 +370,7 @@ get_physical_interfaces() {
         [[ "$iface" == "lo" ]] && continue
         
         # Skip virtual/firewall interfaces
-        [[ "$iface" =~ ^(veth|fwbr|fwln|fwpr|tap) ]] && continue
+        [[ "$iface" =~ $VIRTUAL_IFACE_PATTERN ]] && continue
         
         # This is a physical interface
         echo "$iface"
@@ -369,9 +381,9 @@ get_hba_info() {
     echo -e "\n${GREEN}=== HBA/Storage Controller Information ===${NC}"
 
     # Find RAID, SAS, SATA, SCSI, and storage controllers
-    lspci -vmm 2>/dev/null | awk '
+    lspci -vmm 2>/dev/null | awk -v pattern="$STORAGE_CONTROLLER_PATTERN" '
         BEGIN { RS=""; FS="\n" }
-        /RAID|SAS|SATA|SCSI|Mass storage|Serial Attached|Fibre Channel|NVMe/ {
+        $0 ~ pattern {
             for (i=1; i<=NF; i++) {
                 if ($i ~ /^Slot:/) slot = substr($i, 7)
                 if ($i ~ /^Class:/) class = substr($i, 8)
@@ -390,7 +402,7 @@ get_hba_info() {
 
     # Show detailed info for storage controllers
     echo -e "\n${GREEN}=== Storage Controller Details ===${NC}"
-    for ctrl in $(lspci | grep -iE "RAID|SAS|SATA|SCSI|Mass storage|NVMe" | awk '{print $1}'); do
+    for ctrl in $(lspci | grep -iE "$STORAGE_CONTROLLER_PATTERN" | awk '{print $1}'); do
         echo -e "\n${GREEN}Controller $ctrl:${NC}"
         lspci -vvs "$ctrl" 2>/dev/null | grep -E "^\s+(Subsystem|LnkSta|Kernel driver)" | head -5
     done
@@ -541,7 +553,7 @@ quick_health_check() {
             else
                 echo -e "/dev/$disk: ${YELLOW}check timed out or unavailable${NC}"
             fi
-        done < <(lsblk -d -o name | grep -E '^sd|^nvme')
+        done < <(lsblk -d -o name | grep -E "$DISK_DEVICE_PATTERN")
     fi
 
     # Node Exporter