More linting (#2099)

* Address gocritic findings, enable it

* Enable gosimple, no new findings to address

Author: scop

Diff for: .golangci.yml

@@ -29,15 +29,15 @@ linters:
     - gas
     #- gochecknoinits
     - goconst
-    #- gocritic
+    - gocritic
     #- gocyclo
     #- gofmt
     - goimports
     - golint
     #- gomnd
     #- goprintffuncname
     #- gosec
-    #- gosimple
+    - gosimple
     - govet
     - ineffassign
     - interfacer

Diff for: bash_completions.go

@@ -597,19 +597,16 @@ func writeRequiredFlag(buf io.StringWriter, cmd *Command) {
 		if nonCompletableFlag(flag) {
 			return
 		}
-		for key := range flag.Annotations {
-			switch key {
-			case BashCompOneRequiredFlag:
-				format := "    must_have_one_flag+=(\"--%s"
-				if flag.Value.Type() != "bool" {
-					format += "="
-				}
-				format += cbn
-				WriteStringAndCheck(buf, fmt.Sprintf(format, flag.Name))
-
-				if len(flag.Shorthand) > 0 {
-					WriteStringAndCheck(buf, fmt.Sprintf("    must_have_one_flag+=(\"-%s"+cbn, flag.Shorthand))
-				}
+		if _, ok := flag.Annotations[BashCompOneRequiredFlag]; ok {
+			format := "    must_have_one_flag+=(\"--%s"
+			if flag.Value.Type() != "bool" {
+				format += "="
+			}
+			format += cbn
+			WriteStringAndCheck(buf, fmt.Sprintf(format, flag.Name))
+
+			if len(flag.Shorthand) > 0 {
+				WriteStringAndCheck(buf, fmt.Sprintf("    must_have_one_flag+=(\"-%s"+cbn, flag.Shorthand))
 			}
 		}
 	})

Diff for: command_test.go

@@ -2777,7 +2777,7 @@ func TestFind(t *testing.T) {
 
 func TestUnknownFlagShouldReturnSameErrorRegardlessOfArgPosition(t *testing.T) {
 	testCases := [][]string{
-		//{"--unknown", "--namespace", "foo", "child", "--bar"}, // FIXME: This test case fails, returning the error `unknown command "foo" for "root"` instead of the expected error `unknown flag: --unknown`
+		// {"--unknown", "--namespace", "foo", "child", "--bar"}, // FIXME: This test case fails, returning the error `unknown command "foo" for "root"` instead of the expected error `unknown flag: --unknown`
 		{"--namespace", "foo", "--unknown", "child", "--bar"},
 		{"--namespace", "foo", "child", "--unknown", "--bar"},
 		{"--namespace", "foo", "child", "--bar", "--unknown"},

Diff for: doc/man_docs.go

@@ -133,7 +133,7 @@ func fillHeader(header *GenManHeader, name string, disableAutoGen bool) error {
 		}
 		header.Date = &now
 	}
-	header.date = (*header.Date).Format("Jan 2006")
+	header.date = header.Date.Format("Jan 2006")
 	if header.Source == "" && !disableAutoGen {
 		header.Source = "Auto generated by spf13/cobra"
 	}

Diff for: doc/util.go

@@ -40,7 +40,7 @@ func hasSeeAlso(cmd *cobra.Command) bool {
 // that do not contain \n.
 func forceMultiLine(s string) string {
 	if len(s) > 60 && !strings.Contains(s, "\n") {
-		s = s + "\n"
+		s += "\n"
 	}
 	return s
 }

Diff for: powershell_completions.go

@@ -28,8 +28,8 @@ import (
 func genPowerShellComp(buf io.StringWriter, name string, includeDesc bool) {
 	// Variables should not contain a '-' or ':' character
 	nameForVar := name
-	nameForVar = strings.Replace(nameForVar, "-", "_", -1)
-	nameForVar = strings.Replace(nameForVar, ":", "_", -1)
+	nameForVar = strings.ReplaceAll(nameForVar, "-", "_")
+	nameForVar = strings.ReplaceAll(nameForVar, ":", "_")
 
 	compCmd := ShellCompRequestCmd
 	if !includeDesc {