Add custom version flag (#189)

* Add custom version flag

* Add scripts and workflows to check version

* Fix `revive` error

Author: bombsimon

.github/scripts/check-version.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+# This script is run as a pre-push hook to avoid pushing tags that does not
+# match the version defined in the code.
+#
+# This is the pre-push script in .git/hooks/pre-push:
+#
+#   #!/bin/bash
+#   set -euo pipefail
+#
+#   # Capture pushed refs from stdin
+#   while read -r _ _ remote_ref _; do
+#     if [[ "$remote_ref" =~ refs/tags/(v[0-9]+\.[0-9]+\.[0-9]+) ]]; then
+#       tag="${BASH_REMATCH[1]}"
+#
+#       echo "🔍 Checking version for tag: $tag"
+#       .github/scripts/check-version.sh "$tag"
+#     fi
+#   done
+
+set -euo pipefail
+
+TAG=${1:-}
+
+if [[ -z "$TAG" ]]; then
+    echo "Error: No tag provided."
+    exit 1
+fi
+
+# Look for the tag string in the file that defines the version
+if ! grep -q "wsl version $TAG" ./*.go; then
+    echo "❌ Version constant does not match tag: $TAG"
+    exit 1
+fi
+
+echo "✅ Version constant matches tag: $TAG"

.github/workflows/version-check.yml

@@ -0,0 +1,18 @@
+---
+name: Check version constant matches tag
+
+on:
+  push:
+    tags:
+      - "v*" # Trigger only on tag pushes
+
+jobs:
+  version-check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Check version constant
+        run: .github/scripts/check-version.sh "${GITHUB_REF#refs/tags/}"

analyzer.go

@@ -2,14 +2,18 @@ package wsl
 
 import (
 	"flag"
+	"fmt"
 	"go/ast"
 	"go/token"
+	"os"
 	"strings"
 	"sync"
 
 	"golang.org/x/tools/go/analysis"
 )
 
+const version = "wsl version v5.1.0"
+
 func NewAnalyzer(config *Configuration) *analysis.Analyzer {
 	wa := &wslAnalyzer{config: config}
 
@@ -64,6 +68,7 @@ func (wa *wslAnalyzer) flags() flag.FlagSet {
 	flags.StringVar(&wa.defaultChecks, "default", "", "Can be 'all' for all checks or 'none' for no checks or empty for default checks")
 	flags.Var(&multiStringValue{slicePtr: &wa.enable}, "enable", "Comma separated list of checks to enable")
 	flags.Var(&multiStringValue{slicePtr: &wa.disable}, "disable", "Comma separated list of checks to disable")
+	flags.Var(new(versionFlag), "V", "print version and exit")
 
 	return *flags
 }
@@ -169,6 +174,20 @@ func (m *multiStringValue) String() string {
 	return strings.Join(*m.slicePtr, ", ")
 }
 
+// https://cs.opensource.google/go/x/tools/+/refs/tags/v0.35.0:go/analysis/internal/analysisflags/flags.go;l=188-237;drc=99337ebe7b90918701a41932abf121600b972e34
+type versionFlag string
+
+func (*versionFlag) IsBoolFlag() bool { return true }
+func (*versionFlag) Get() any         { return nil }
+func (*versionFlag) String() string   { return "" }
+
+func (*versionFlag) Set(_ string) error {
+	fmt.Println(version)
+	os.Exit(0)
+
+	return nil
+}
+
 func getFilename(fset *token.FileSet, file *ast.File) string {
 	filename := fset.PositionFor(file.Pos(), true).Filename
 	if !strings.HasSuffix(filename, ".go") {