build(deps): bump github.com/ldez/grignotin from 0.7.0 to 0.8.0 (golangci#5295)

Co-authored-by: Fernandez Ludovic <ldez@users.noreply.github.com>

Author: dependabot[bot]

go.mod

@@ -67,7 +67,7 @@ require (
 	github.com/lasiar/canonicalheader v1.1.2
 	github.com/ldez/exptostd v0.3.1
 	github.com/ldez/gomoddirectives v0.6.0
-	github.com/ldez/grignotin v0.7.0
+	github.com/ldez/grignotin v0.8.0
 	github.com/ldez/tagliatelle v0.7.1
 	github.com/ldez/usetesting v0.4.2
 	github.com/leonklingele/grouper v1.1.2

go.sum

@@ -9,6 +9,7 @@ import (
 	"strings"
 
 	hcversion "github.com/hashicorp/go-version"
+	"github.com/ldez/grignotin/goenv"
 	"github.com/ldez/grignotin/gomod"
 	"golang.org/x/mod/modfile"
 )
@@ -80,43 +81,57 @@ func IsGoGreaterThanOrEqual(current, limit string) bool {
 }
 
 func detectGoVersion() string {
-	goVersion := detectGoVersionFromGoMod()
-	if goVersion != "" {
-		return goVersion
-	}
-
-	return cmp.Or(os.Getenv("GOVERSION"), "1.17")
+	return cmp.Or(detectGoVersionFromGoMod(), "1.17")
 }
 
 // detectGoVersionFromGoMod tries to get Go version from go.mod.
 // It returns `toolchain` version if present,
 // else it returns `go` version if present,
+// else it returns `GOVERSION` version if present,
 // else it returns empty.
 func detectGoVersionFromGoMod() string {
-	modPath, err := gomod.GetGoModPath()
+	values, err := goenv.Get(goenv.GOMOD, goenv.GOVERSION)
 	if err != nil {
-		modPath = detectGoModFallback()
-		if modPath == "" {
-			return ""
+		values = map[string]string{
+			goenv.GOMOD: detectGoModFallback(),
 		}
 	}
 
-	file, err := parseGoMod(modPath)
+	if values[goenv.GOMOD] == "" {
+		return parseGoVersion(values[goenv.GOVERSION])
+	}
+
+	file, err := parseGoMod(values[goenv.GOMOD])
 	if err != nil {
-		return ""
+		return parseGoVersion(values[goenv.GOVERSION])
 	}
 
 	// The toolchain exists only if 'toolchain' version > 'go' version.
 	// If 'toolchain' version <= 'go' version, `go mod tidy` will remove 'toolchain' version from go.mod.
 	if file.Toolchain != nil && file.Toolchain.Name != "" {
-		return strings.TrimPrefix(file.Toolchain.Name, "go")
+		return parseGoVersion(file.Toolchain.Name)
 	}
 
 	if file.Go != nil && file.Go.Version != "" {
 		return file.Go.Version
 	}
 
-	return ""
+	return parseGoVersion(values[goenv.GOVERSION])
+}
+
+func parseGoVersion(v string) string {
+	raw := strings.TrimPrefix(v, "go")
+
+	// prerelease version (ex: go1.24rc1)
+	idx := strings.IndexFunc(raw, func(r rune) bool {
+		return (r < '0' || r > '9') && r != '.'
+	})
+
+	if idx != -1 {
+		raw = raw[:idx]
+	}
+
+	return raw
 }
 
 func parseGoMod(goMod string) (*modfile.File, error) {

pkg/config/config.go

@@ -83,3 +83,47 @@ func TestIsGoGreaterThanOrEqual(t *testing.T) {
 		})
 	}
 }
+
+func Test_parseGoVersion(t *testing.T) {
+	testCases := []struct {
+		desc     string
+		version  string
+		expected string
+	}{
+		{
+			desc:     "empty version",
+			version:  "",
+			expected: "",
+		},
+		{
+			desc:     "no prefixed version",
+			version:  "1.23.0",
+			expected: "1.23.0",
+		},
+		{
+			desc:     "semver version",
+			version:  "go1.23.0",
+			expected: "1.23.0",
+		},
+		{
+			desc:     "family version",
+			version:  "go1.23",
+			expected: "1.23",
+		},
+		{
+			desc:     "prerelease version",
+			version:  "go1.24rc1",
+			expected: "1.24",
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			v := parseGoVersion(test.version)
+
+			assert.Equal(t, test.expected, v)
+		})
+	}
+}