Add staticcheck tool

vendor/honnef.co/go/tools/simple/s1000/s1000.go

@@ -0,0 +1,71 @@
+package s1000
+
+import (
+	"go/ast"
+
+	"honnef.co/go/tools/analysis/code"
+	"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"
+	"golang.org/x/tools/go/analysis/passes/inspect"
+)
+
+var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
+	Analyzer: &analysis.Analyzer{
+		Name:     "S1000",
+		Run:      run,
+		Requires: []*analysis.Analyzer{inspect.Analyzer, generated.Analyzer},
+	},
+	Doc: &lint.RawDocumentation{
+		Title: `Use plain channel send or receive instead of single-case select`,
+		Text: `Select statements with a single case can be replaced with a simple
+send or receive.`,
+		Before: `
+select {
+case x := <-ch:
+    fmt.Println(x)
+}`,
+		After: `
+x := <-ch
+fmt.Println(x)
+`,
+		Since:   "2017.1",
+		MergeIf: lint.MergeIfAny,
+	},
+})
+
+var Analyzer = SCAnalyzer.Analyzer
+
+var (
+	checkSingleCaseSelectQ1 = pattern.MustParse(`
+		(ForStmt
+			nil nil nil
+			select@(SelectStmt
+				(CommClause
+					(Or
+						(UnaryExpr "<-" _)
+						(AssignStmt _ _ (UnaryExpr "<-" _)))
+					_)))`)
+	checkSingleCaseSelectQ2 = pattern.MustParse(`(SelectStmt (CommClause _ _))`)
+)
+
+func run(pass *analysis.Pass) (any, error) {
+	seen := map[ast.Node]struct{}{}
+	fn := func(node ast.Node) {
+		if m, ok := code.Match(pass, checkSingleCaseSelectQ1, node); ok {
+			seen[m.State["select"].(ast.Node)] = struct{}{}
+			report.Report(pass, node, "should use for range instead of for { select {} }", report.FilterGenerated())
+		} else if _, ok := code.Match(pass, checkSingleCaseSelectQ2, node); ok {
+			if _, ok := seen[node]; !ok {
+				report.Report(pass, node, "should use a simple channel send/receive instead of select with a single case",
+					report.ShortRange(),
+					report.FilterGenerated())
+			}
+		}
+	}
+	code.Preorder(pass, fn, (*ast.ForStmt)(nil), (*ast.SelectStmt)(nil))
+	return nil, nil
+}