Add Equal methods for testing (#17)

This allows code that generates options to be compared without depending on being able to examine or infer the config.

go.mod

@@ -2,8 +2,9 @@ module github.com/launchdarkly/go-options
 
 require (
 	github.com/fatih/structtag v1.0.0
-	github.com/onsi/ginkgo v1.8.0
-	github.com/onsi/gomega v1.5.0
+	github.com/google/go-cmp v0.5.6
+	github.com/onsi/ginkgo v1.16.2
+	github.com/onsi/gomega v1.13.0
 	golang.org/x/tools v0.1.2
 )
 

go.sum

@@ -1,54 +1,107 @@
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main.go

@@ -29,6 +29,7 @@ var optionPrefix string
 var optionSuffix string
 var imports string
 var quoteStrings bool
+var implementEqual bool
 
 var Usage = func() {
 	fmt.Fprintf(flag.CommandLine.Output(), "Usage of %s <type>:\n\n", os.Args[0])
@@ -49,13 +50,15 @@ func initFlags() {
 	flag.StringVar(&optionPrefix, "prefix", "", `name of prefix to use for options (default is the same as "option")`)
 	flag.StringVar(&optionSuffix, "suffix", "", `name of suffix to use for options (forces use of suffix, cannot with used with prefix)`)
 	flag.BoolVar(&quoteStrings, "quote-default-strings", true, `set to false to disable automatic quoting of string field defaults`)
+	flag.BoolVar(&implementEqual, "cmp", true, `set to false to disable creating Equals() method for options`)
 	flag.BoolVar(&runGoFmt, "fmt", true, `set to false to skip go format`)
 	flag.Usage = Usage
 }
 
 type Field struct {
 	Name         string
 	ParamName    string
+	ParamType    string
 	Type         string
 	DefaultValue string
 }
@@ -181,6 +184,7 @@ func writeOptionsFile(types []string, packageName string, node ast.Node, fset *t
 					}
 				}
 			}
+			paramType := typeStr
 
 			isStruct := false
 			var fields []Field
@@ -193,11 +197,12 @@ func writeOptionsFile(types []string, packageName string, node ast.Node, fset *t
 						continue
 					}
 					typeStr := getType(fset, sfield.Type)
+					paramType := typeStr
 					if strings.HasSuffix(paramName, "...") {
 						paramName = paramName[0 : len(paramName)-3]
 						switch t := sfield.Type.(type) {
 						case *ast.ArrayType:
-							typeStr = "..." + getType(fset, t.Elt)
+							paramType = "..." + getType(fset, t.Elt)
 						default:
 							log.Fatalf(`expected slice type for "%+v"`, sfield)
 						}
@@ -206,6 +211,7 @@ func writeOptionsFile(types []string, packageName string, node ast.Node, fset *t
 						fields = append(fields, Field{
 							Name:         n.Name,
 							ParamName:    stringsOr(paramName, n.Name),
+							ParamType:    paramType,
 							Type:         typeStr,
 							DefaultValue: defaultValue,
 						})
@@ -214,11 +220,11 @@ func writeOptionsFile(types []string, packageName string, node ast.Node, fset *t
 			case *ast.ArrayType:
 				if strings.HasSuffix(publicName, "...") {
 					publicName = publicName[0 : len(publicName)-3]
-					typeStr = "..." + getType(fset, t.Elt)
+					paramType = "..." + getType(fset, t.Elt)
 				}
-				fields = append(fields, Field{Name: "", ParamName: "o", Type: typeStr})
+				fields = append(fields, Field{Name: "", ParamName: "o", ParamType: paramType, Type: typeStr})
 			default:
-				fields = append(fields, Field{Name: "", ParamName: "o", Type: typeStr})
+				fields = append(fields, Field{Name: "", ParamName: "o", ParamType: paramType, Type: typeStr})
 			}
 
 			if defaultIsNil && defaultValue != "" {
@@ -275,6 +281,7 @@ func writeOptionsFile(types []string, packageName string, node ast.Node, fset *t
 			"applyFuncName":       applyFunctionName,
 			"applyOptionFuncName": applyOptionFunctionType,
 			"createNewFunc":       createNewFunc,
+			"implementEqual":      implementEqual,
 		})
 		if err != nil {
 			log.Fatal(fmt.Errorf("template execute failed: %s", err))
@@ -315,7 +322,7 @@ func parseStructTag(field *ast.Field) (publicName string, defaultValue string, s
 			}
 		}
 	}
-	SkipTag:
+SkipTag:
 	return publicName, formatDefault(field.Type, defaultValue), false
 }
 

render.gotmpl

@@ -8,21 +8,25 @@ import (
 )
 {{ end }}
 
-{{ $applyOptionFuncType := or $.applyOptionFuncType (printf "Apply%sFunc" (ToTitle $.optionTypeName)) }}
+{{ if and .implementEqual .options -}}
+import "github.com/google/go-cmp/cmp"
+{{ end }}
+
+{{ $applyOptionFuncType := or $.applyOptionFuncType (printf "Apply%sFunc" (ToPublic $.optionTypeName)) }}
 
 type {{ $applyOptionFuncType }} func(c *{{ $.configTypeName }}) error
 
 func (f {{ $applyOptionFuncType }}) apply(c *{{ $.configTypeName }}) error {
-return f(c)
+    return f(c)
 }
 
-{{ $applyFuncName := or $.applyFuncName (printf "apply%sOptions" (ToTitle $.configTypeName)) }}
+{{ $applyFuncName := or $.applyFuncName (printf "apply%sOptions" (ToPublic $.configTypeName)) }}
 
 {{ if $.createNewFunc}}
-func new{{ $.configTypeName | ToTitle}}(options ...{{ $.optionTypeName }}) ({{ $.configTypeName }}, error) {
-var c {{ $.configTypeName }}
-err := {{ $applyFuncName }}(&c, options...)
-return c, err
+func new{{ $.configTypeName | ToPublic}}(options ...{{ $.optionTypeName }}) ({{ $.configTypeName }}, error) {
+    var c {{ $.configTypeName }}
+    err := {{ $applyFuncName }}(&c, options...)
+    return c, err
 }
 {{ end }}
 
@@ -33,37 +37,65 @@ func {{ $applyFuncName }}(c *{{ $.configTypeName }}, options ...{{ $.optionTypeN
     c.{{ $optionName }}.{{ .Name }} = {{ .DefaultValue }}
 {{- end }}{{ end }}
 {{- end }}{{ end }}
-for _, o := range options {
-if err := o.apply(c); err != nil {
-return err
-}
-}
-return nil
+    for _, o := range options {
+        if err := o.apply(c); err != nil {
+            return err
+            }
+    }
+    return nil
 }
 
 type {{ $.optionTypeName }} interface {
-apply(*{{ $.configTypeName }}) error
+    apply(*{{ $.configTypeName }}) error
 }
 
 {{ range .options }}{{ $option := . }}
-{{ $name := .PublicName | ToTitle | printf "%s%s" $.optionPrefix }}
-{{ if $.optionSuffix }}{{ $name = $.optionSuffix | printf "%s%s" (.PublicName | ToTitle) }}{{ end  }}
-{{ if .Docs }}
-{{- range $i, $doc := .Docs }}// {{ if eq $i 0 }}{{ $name }} {{ end }}{{ $doc }}{{ end -}}
-{{ end -}}
-func {{ $name }}(
-{{- range $i, $f := .Fields }}{{ if ne $i 0 }},{{ end }}{{ $f.ParamName }} {{ $f.Type }}{{ end -}}
-) {{ $applyOptionFuncType }} {
-    return func(c *{{ $.configTypeName }}) error {
+
+{{ $name := .PublicName | ToPublic | printf "%s%s" $.optionPrefix }}
+{{ if $.optionSuffix }}{{ $name = $.optionSuffix | printf "%s%s" (.PublicName | ToPublic) }}{{ end  }}
+
+{{ $implName := $name | printf "%sImpl" | ToPrivate }}
+
+type {{ $implName }} struct {
+{{- range .Fields }}
+    {{ .ParamName }} {{ .Type }}
+{{- end }}
+}
+
+func (o {{ $implName }}) apply(c *{{ $.configTypeName }}) error {
 {{- if and $option.IsStruct $option.DefaultIsNil }}
-        c.{{ $option.Name }} = new({{ $option.Type }})
+    c.{{ $option.Name }} = new({{ $option.Type }})
 {{- end }}
 {{- range .Fields }}{{ if $option.IsStruct }}
-        c.{{ $option.Name }}.{{ .Name }} = {{ .ParamName }}
+    c.{{ $option.Name }}.{{ .Name }} = o.{{ .ParamName }}
 {{- else }}
-        c.{{ $option.Name }} = {{ if $option.DefaultIsNil }}&{{ end }}{{ .ParamName }}
+    c.{{ $option.Name }} = {{ if $option.DefaultIsNil }}&{{ end }}o.{{ .ParamName }}
 {{- end }}{{- end }}
-        return nil
+    return nil
+}
+
+{{ if $.implementEqual -}}
+func (o {{ $implName }}) Equal(v {{ $implName }}) bool {
+    switch {
+{{- range .Fields }}
+    case !cmp.Equal(o.{{ .ParamName }}, v.{{ .ParamName }}):
+        return false
+{{- end }}
+    }
+    return true
+}
+{{ end }}
+
+{{ if .Docs }}
+{{- range $i, $doc := .Docs }}// {{ if eq $i 0 }}{{ $name }} {{ end }}{{ $doc }}{{ end -}}
+{{ end -}}
+func {{ $name }}(
+{{- range $i, $f := .Fields }}{{ if ne $i 0 }},{{ end }}{{ $f.ParamName }} {{ $f.ParamType }}{{ end -}}
+) {{ $.optionTypeName }} {
+    return {{ $implName }}{
+{{- range .Fields }}
+        {{ .ParamName }}: {{ .ParamName }},
+{{- end }}
     }
 }
 {{ end }}

template.go

@@ -6,8 +6,11 @@ import (
 )
 
 var funcMap = template.FuncMap{
-	"ToTitle": func(s string) string {
-		return strings.ToTitle(s[:1]) + s[1:]
+	"ToPrivate": func(s string) string {
+		return strings.ToLower(s[:1]) + s[1:]
+	},
+	"ToPublic": func(s string) string {
+		return strings.ToUpper(s[:1]) + s[1:]
 	},
 }