Add staticcheck tool

vendor/honnef.co/go/tools/simple/s1012/s1012.go

@@ -0,0 +1,46 @@
+package s1012
+
+import (
+	"honnef.co/go/tools/analysis/code"
+	"honnef.co/go/tools/analysis/edit"
+	"honnef.co/go/tools/analysis/facts/generated"
+	"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:     "S1012",
+		Run:      run,
+		Requires: append([]*analysis.Analyzer{generated.Analyzer}, code.RequiredAnalyzers...),
+	},
+	Doc: &lint.RawDocumentation{
+		Title: `Replace \'time.Now().Sub(x)\' with \'time.Since(x)\'`,
+		Text: `The \'time.Since\' helper has the same effect as using \'time.Now().Sub(x)\'
+but is easier to read.`,
+		Before:  `time.Now().Sub(x)`,
+		After:   `time.Since(x)`,
+		Since:   "2017.1",
+		MergeIf: lint.MergeIfAny,
+	},
+})
+
+var Analyzer = SCAnalyzer.Analyzer
+
+var (
+	checkTimeSinceQ = pattern.MustParse(`(CallExpr (SelectorExpr (CallExpr (Symbol "time.Now") []) (Symbol "(time.Time).Sub")) [arg])`)
+	checkTimeSinceR = pattern.MustParse(`(CallExpr (SelectorExpr (Ident "time") (Ident "Since")) [arg])`)
+)
+
+func run(pass *analysis.Pass) (any, error) {
+	for node, m := range code.Matches(pass, checkTimeSinceQ) {
+		edits := code.EditMatch(pass, node, m, checkTimeSinceR)
+		report.Report(pass, node, "should use time.Since instead of time.Now().Sub",
+			report.FilterGenerated(),
+			report.Fixes(edit.Fix("Replace with call to time.Since", edits...)))
+	}
+	return nil, nil
+}