MM-17888 Check plugin Helpers minimum server version comments (#12663)

plugin/checker/internal/version/version.go

@@ -0,0 +1,80 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package version
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+type V string
+
+func (v V) GreaterThanOrEqualTo(other V) bool {
+	return !v.LessThan(other)
+}
+
+func (v V) LessThan(other V) bool {
+	leftParts, leftCount := split(v)
+	rightParts, rightCount := split(other)
+
+	var length int
+	if leftCount < rightCount {
+		length = rightCount
+	} else {
+		length = leftCount
+	}
+
+	for i := 0; i < length; i++ {
+		var left, right string
+
+		if i < leftCount {
+			left = leftParts[i]
+		}
+
+		if i < rightCount {
+			right = rightParts[i]
+		}
+
+		if left == right {
+			continue
+		}
+
+		leftInt := parseInt(left)
+		rightInt := parseInt(right)
+
+		isNumericalComparison := leftInt != nil && rightInt != nil
+
+		if isNumericalComparison {
+			return *leftInt < *rightInt
+		}
+
+		return left < right
+	}
+
+	return false
+}
+
+func split(v V) ([]string, int) {
+	var chunks []string
+
+	for _, part := range strings.Split(string(v), ".") {
+		chunks = append(chunks, splitNumericalChunks(part)...)
+	}
+
+	return chunks, len(chunks)
+}
+
+var numericalOrAlphaRE = regexp.MustCompile(`(\d+|\D+)`)
+
+func splitNumericalChunks(s string) []string {
+	return numericalOrAlphaRE.FindAllString(s, -1)
+}
+
+func parseInt(s string) *int64 {
+	if n, err := strconv.ParseInt(s, 10, 64); err == nil {
+		return &n
+	}
+	return nil
+}