86 lines
1.9 KiB
Bash
86 lines
1.9 KiB
Bash
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#!/usr/bin/env bash
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set -euo pipefail
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usage=$(cat <<EOF
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Usage: $0 X.Y[.Z[.W[...]]] <compare_op> A.B[.C[.D[...]]]
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Compares two version strings with the specified operator.
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compare_ops:
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lt - less than
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le - less than or equal to
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eq - equal to
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ne - not equal to
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ge - greater than or equal to
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gt - greater than
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EOF
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)
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readonly usage
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if [[ "$#" -ne 3 ]]; then
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echo "Error: Invalid arguments: $*" >&2
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echo "$usage" >&2
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exit 1
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fi
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version_a="$1"
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operator="$2"
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version_b="$3"
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# Validate operator
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if [[ ! "$operator" =~ ^(lt|le|eq|ne|ge|gt)$ ]]; then
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echo "Error: Invalid operator '$operator'. Must be one of: lt, le, eq, ne, ge, gt." >&2
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echo "$usage" >&2
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exit 1
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fi
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# Validate versions:
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version_regex='^[0-9]+(\.[0-9]+)*$'
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if [[ ! "$version_a" =~ $version_regex ]]; then
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echo "Error: Invalid version string '$version_a'." >&2
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echo "$usage" >&2
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exit 1
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fi
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if [[ ! "$version_b" =~ $version_regex ]]; then
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echo "Error: Invalid version string '$version_b'." >&2
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echo "$usage" >&2
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exit 1
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fi
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# Split versions into arrays
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IFS='.' read -r -a ver_a_parts <<< "$version_a"
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IFS='.' read -r -a ver_b_parts <<< "$version_b"
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max_length=${#ver_a_parts[@]}
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if [[ "${#ver_b_parts[@]}" -gt "$max_length" ]]; then
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max_length=${#ver_b_parts[@]}
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fi
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# Compare each part
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for ((i=0; i<max_length; i++)); do
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part_a=${ver_a_parts[i]:-0}
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part_b=${ver_b_parts[i]:-0}
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if ((part_a < part_b)); then
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result="lt"
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break
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elif ((part_a > part_b)); then
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result="gt"
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break
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else
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result="eq"
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fi
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done
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# Evaluate the comparison based on the operator
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case "$operator" in
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lt) [[ "$result" == "lt" ]] ;;
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le) [[ "$result" == "lt" || "$result" == "eq" ]] ;;
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eq) [[ "$result" == "eq" ]] ;;
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ne) [[ "$result" != "eq" ]] ;;
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ge) [[ "$result" == "gt" || "$result" == "eq" ]] ;;
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gt) [[ "$result" == "gt" ]] ;;
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*) echo "Error: Unhandled operator '${operator}'." >&2; exit 1 ;;
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esac
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exit $?
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