Add staticcheck tool

vendor/honnef.co/go/tools/staticcheck/sa6006/sa6006.go

@@ -0,0 +1,46 @@
+package sa6006
+
+import (
+	"go/ast"
+
+	"honnef.co/go/tools/analysis/code"
+	"honnef.co/go/tools/analysis/lint"
+	"honnef.co/go/tools/analysis/report"
+	"honnef.co/go/tools/pattern"
+
+	"golang.org/x/tools/go/analysis"
+)
+
+var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
+	Analyzer: &analysis.Analyzer{
+		Name:     "SA6006",
+		Run:      run,
+		Requires: code.RequiredAnalyzers,
+	},
+	Doc: &lint.RawDocumentation{
+		Title: `Using io.WriteString to write \'[]byte\'`,
+		Text: `Using io.WriteString to write a slice of bytes, as in
+
+    io.WriteString(w, string(b))
+
+is both unnecessary and inefficient. Converting from \'[]byte\' to \'string\'
+has to allocate and copy the data, and we could simply use \'w.Write(b)\'
+instead.`,
+
+		Since: "2024.1",
+	},
+})
+
+var Analyzer = SCAnalyzer.Analyzer
+
+var ioWriteStringConversion = pattern.MustParse(`(CallExpr (Symbol "io.WriteString") [_ (CallExpr (Builtin "string") [arg])])`)
+
+func run(pass *analysis.Pass) (any, error) {
+	for node, m := range code.Matches(pass, ioWriteStringConversion) {
+		if !code.IsOfStringConvertibleByteSlice(pass, m.State["arg"].(ast.Expr)) {
+			continue
+		}
+		report.Report(pass, node, "use io.Writer.Write instead of converting from []byte to string to use io.WriteString")
+	}
+	return nil, nil
+}