Add JSDoc comments

v2/pkg/commands/build/internal/backendjs/backendjs.go

@@ -1,3 +1,5 @@
+// Package backendjs deals with generating the `backend` Javascript module
+// used by the frontend to interact with Go
 package backendjs
 
 import (

v2/pkg/commands/build/internal/backendjs/conversion.go

@@ -0,0 +1,43 @@
+package backendjs
+
+import "reflect"
+
+// JSType represents a javascript type
+type JSType string
+
+const (
+	// JsString is a JS string
+	JsString JSType = "string"
+	// JsBoolean is a JS bool
+	JsBoolean = "boolean"
+	// JsInt is a JS number
+	JsInt = "number"
+	// JsFloat is a JS number
+	JsFloat = "number"
+	// JsArray is a JS array
+	JsArray = "Array"
+	// JsObject is a JS object
+	JsObject = "Object"
+	// JsUnsupported represents a type that cannot be converted
+	JsUnsupported = "*"
+)
+
+func goTypeToJS(input reflect.Kind) JSType {
+	switch input {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return JsInt
+	case reflect.String:
+		return JsString
+	case reflect.Float32, reflect.Float64, reflect.Complex64:
+		return JsFloat
+	case reflect.Bool:
+		return JsBoolean
+	case reflect.Array, reflect.Slice:
+		return JsArray
+	case reflect.Ptr, reflect.Struct, reflect.Map, reflect.Interface:
+		return JsObject
+	default:
+		return JsUnsupported
+	}
+}

v2/pkg/commands/build/internal/backendjs/index.template

@@ -0,0 +1,9 @@
+// index.js
+// Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
+// This file is automatically generated. DO NOT EDIT
+{{range .}}
+const {{.Name}} = require('./{{.Name}}');
+{{end}}
+module.exports = {
+    {{range .}}{{.Name}}: {{.Name}},{{end}}
+}

v2/pkg/commands/build/internal/backendjs/package.template

@@ -1,9 +1,22 @@
-// index.js
 // Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
 // This file is automatically generated. DO NOT EDIT
-{{range .}}
+
-const {{.Name}} = require('./{{.Name}}');
+// {{.Name}}.js
+{{range .Comments}}// {{.}}{{end}}
+
+{{range .Methods}}
+/**{{if .Comments }}
+{{range .Comments}}  * {{ . }}{{end}}
+  *{{end}}
+  * @function {{.Name}}
+{{range .Inputs}}  * @param {{"{"}}{{.JSType}}{{"}"}} {{.Name}}
+{{end}}  *
+  * @returns {Promise} 
+  */
+function {{.Name}}({{.InputsAsJSText}}) {
+    return window.backend.{{$.Name}}.{{.Name}}();
+}
 {{end}}
 module.exports = {
-    {{range .}}{{.Name}}: {{.Name}},{{end}}
+    {{range .Methods}}{{.Name}}: {{.Name}},{{end}}
 }

v2/pkg/commands/build/internal/backendjs/packages.go

@@ -3,6 +3,7 @@ package backendjs
 import (
 	"bytes"
 	"io/ioutil"
+	"reflect"
 	"text/template"
 
 	"github.com/pkg/errors"
@@ -38,10 +39,40 @@ func parsePackages() ([]*Package, error) {
 
 	result = append(result, &Package{
 		Name:     "mypackage",
-		Comments: []string{"// mypackage is awesome"},
+		Comments: []string{"mypackage is awesome"},
 		Methods: []*Method{
 			{
 				Name:     "Naked",
+				Comments: []string{"Naked is a method that does nothing"},
+			},
+		},
+	})
+	result = append(result, &Package{
+		Name:     "otherpackage",
+		Comments: []string{"otherpackage is awesome"},
+		Methods: []*Method{
+			{
+				Name:     "OneInput",
+				Comments: []string{"OneInput does stuff"},
+				Inputs: []*Parameter{
+					{
+						Name: "name",
+						Type: reflect.String,
+					},
+				},
+			},
+			{
+				Name: "TwoInputs",
+				Inputs: []*Parameter{
+					{
+						Name: "name",
+						Type: reflect.String,
+					},
+					{
+						Name: "age",
+						Type: reflect.Uint8,
+					},
+				},
 			},
 		},
 	})
@@ -55,17 +86,23 @@ func generateJSFiles(packages []*Package) error {
 	if err != nil {
 		return errors.Wrap(err, "Error generating index.js file")
 	}
+
+	err = generatePackageFiles(packages)
+	if err != nil {
+		return errors.Wrap(err, "Error generating packages")
+	}
+
 	return nil
 }
 
 func generateIndexJS(packages []*Package) error {
 
 	// Get path to local file
-	templateFile := fs.RelativePath("./package.template")
+	templateFile := fs.RelativePath("./index.template")
 
 	// Load template
 	templateData := fs.MustLoadString(templateFile)
-	packagesTemplate, err := template.New("packages").Parse(templateData)
+	packagesTemplate, err := template.New("index").Parse(templateData)
 	if err != nil {
 		return errors.Wrap(err, "Error creating template")
 	}
@@ -80,7 +117,7 @@ func generateIndexJS(packages []*Package) error {
 	// Calculate target filename
 	indexJS, err := fs.RelativeToCwd("./frontend/backend/index.js")
 	if err != nil {
-		return errors.Wrap(err, "Error creating backend js directory")
+		return errors.Wrap(err, "Error calculating index js path")
 	}
 
 	err = ioutil.WriteFile(indexJS, buffer.Bytes(), 0755)
@@ -90,3 +127,40 @@ func generateIndexJS(packages []*Package) error {
 
 	return nil
 }
+
+func generatePackageFiles(packages []*Package) error {
+
+	// Get path to local file
+	templateFile := fs.RelativePath("./package.template")
+
+	// Load template
+	templateData := fs.MustLoadString(templateFile)
+	packagesTemplate, err := template.New("package").Parse(templateData)
+	if err != nil {
+		return errors.Wrap(err, "Error creating template")
+	}
+
+	// Iterate over each package
+	for _, thisPackage := range packages {
+
+		// Execute template
+		var buffer bytes.Buffer
+		err = packagesTemplate.Execute(&buffer, thisPackage)
+		if err != nil {
+			return errors.Wrap(err, "Error generating code")
+		}
+
+		// Calculate target filename
+		packageFile, err := fs.RelativeToCwd("./frontend/backend/" + thisPackage.Name + ".js")
+		if err != nil {
+			return errors.Wrap(err, "Error calculating package path")
+		}
+
+		err = ioutil.WriteFile(packageFile, buffer.Bytes(), 0755)
+		if err != nil {
+			return errors.Wrap(err, "Error writing backend package file")
+		}
+	}
+
+	return nil
+}

v2/pkg/commands/build/internal/backendjs/structs.go

@@ -2,12 +2,19 @@ package backendjs
 
 import (
 	"reflect"
+	"strings"
 )
 
 // Parameter defines a parameter used by a struct method
 type Parameter struct {
 	Name string
-	Type reflect.Type
+	Type reflect.Kind
+}
+
+// JSType returns the Javascript equivalent of the
+// parameter type
+func (p *Parameter) JSType() string {
+	return string(goTypeToJS(p.Type))
 }
 
 // Method defines a struct method
@@ -18,6 +25,18 @@ type Method struct {
 	Comments []string
 }
 
+// InputsAsJSText generates a string with the method inputs
+// formatted in a way acceptable to Javascript
+func (m *Method) InputsAsJSText() string {
+	var inputs []string
+
+	for _, input := range m.Inputs {
+		inputs = append(inputs, input.Name)
+	}
+
+	return strings.Join(inputs, ", ")
+}
+
 // func generateStructFile() {
 // 	// Create string buffer
 // 	var result bytes.Buffer