Add staticcheck tool

vendor/honnef.co/go/tools/staticcheck/sa1013/sa1013.go

@@ -0,0 +1,47 @@
+package sa1013
+
+import (
+	"go/ast"
+
+	"honnef.co/go/tools/analysis/code"
+	"honnef.co/go/tools/analysis/edit"
+	"honnef.co/go/tools/analysis/lint"
+	"honnef.co/go/tools/analysis/report"
+	"honnef.co/go/tools/knowledge"
+	"honnef.co/go/tools/pattern"
+
+	"golang.org/x/tools/go/analysis"
+)
+
+var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
+	Analyzer: &analysis.Analyzer{
+		Name:     "SA1013",
+		Run:      run,
+		Requires: code.RequiredAnalyzers,
+	},
+	Doc: &lint.RawDocumentation{
+		Title:    `\'io.Seeker.Seek\' is being called with the whence constant as the first argument, but it should be the second`,
+		Since:    "2017.1",
+		Severity: lint.SeverityWarning,
+		MergeIf:  lint.MergeIfAny,
+	},
+})
+
+var Analyzer = SCAnalyzer.Analyzer
+
+var (
+	checkSeekerQ = pattern.MustParse(`(CallExpr fun@(SelectorExpr _ (Ident "Seek")) [arg1@(SelectorExpr _ (Symbol (Or "io.SeekStart" "io.SeekCurrent" "io.SeekEnd"))) arg2])`)
+	checkSeekerR = pattern.MustParse(`(CallExpr fun [arg2 arg1])`)
+)
+
+func run(pass *analysis.Pass) (any, error) {
+	for node, m := range code.Matches(pass, checkSeekerQ) {
+		if !code.IsMethod(pass, m.State["fun"].(*ast.SelectorExpr), "Seek", knowledge.Signatures["(io.Seeker).Seek"]) {
+			continue
+		}
+		edits := code.EditMatch(pass, node, m, checkSeekerR)
+		report.Report(pass, node, "the first argument of io.Seeker is the offset, but an io.Seek* constant is being used instead",
+			report.Fixes(edit.Fix("Swap arguments", edits...)))
+	}
+	return nil, nil
+}