Support platform list in templates

cmd/project.go

@@ -6,6 +6,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"runtime"
 	"sort"
 	"strings"
 
@@ -163,6 +164,23 @@ type ProjectOptions struct {
 	Architecture           string
 	LdFlags                string
 	GoPath                 string
+
+	// Supported platforms
+	Platforms []string `json:"platforms,omitempty"`
+}
+
+// PlatformSupported returns true if the template is supported
+// on the current platform
+func (po *ProjectOptions) PlatformSupported() bool {
+
+	// Default is all platforms supported
+	if len(po.Platforms) == 0 {
+		return true
+	}
+
+	// Check that the platform is in the list
+	platformsSupported := slicer.String(po.Platforms)
+	return platformsSupported.Contains(runtime.GOOS)
 }
 
 // Defaults sets the default project template
@@ -233,13 +251,16 @@ func (po *ProjectOptions) PromptForInputs() error {
 		for _, k := range keys {
 			templateDetail := templateDetails[k]
 			templateList.Add(templateDetail)
+			if !templateDetail.Metadata.PlatformSupported() {
+				templateDetail.Metadata.Name = "* " + templateDetail.Metadata.Name
+			}
 			options.Add(fmt.Sprintf("%s - %s", templateDetail.Metadata.Name, templateDetail.Metadata.ShortDescription))
 		}
 
 		templateIndex := 0
 
 		if len(options.AsSlice()) > 1 {
-			templateIndex = PromptSelection("Please select a template", options.AsSlice(), 0)
+			templateIndex = PromptSelection("Please select a template (* means unsupported on current platform)", options.AsSlice(), 0)
 		}
 
 		if len(templateList.AsSlice()) == 0 {
@@ -250,6 +271,10 @@ func (po *ProjectOptions) PromptForInputs() error {
 		po.selectedTemplate = templateList.AsSlice()[templateIndex].(*TemplateDetails)
 	}
 
+	po.selectedTemplate.Metadata.Name = strings.TrimPrefix(po.selectedTemplate.Metadata.Name, "* ")
+	if !po.selectedTemplate.Metadata.PlatformSupported() {
+		println("WARNING: This template is unsupported on this platform!")
+	}
 	fmt.Println("Template: " + po.selectedTemplate.Metadata.Name)
 
 	// Setup NPM Project name
@@ -372,5 +397,9 @@ func processTemplateMetadata(templateMetadata *TemplateMetadata, po *ProjectOpti
 		}
 		po.FrontEnd.Serve = templateMetadata.Serve
 	}
+
+	// Save platforms
+	po.Platforms = templateMetadata.Platforms
+
 	return nil
 }

cmd/templates.go

@@ -7,6 +7,7 @@ import (
 	"io/ioutil"
 	"log"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"text/template"
 
@@ -29,6 +30,26 @@ type TemplateMetadata struct {
 	Bridge               string                `json:"bridge"`
 	WailsDir             string                `json:"wailsdir"`
 	TemplateDependencies []*TemplateDependency `json:"dependencies,omitempty"`
+
+	// List of platforms that this template is supported on.
+	// No value means all platforms. A platform name is the same string
+	// as `runtime.GOOS` will return, eg: "darwin". NOTE: This is
+	// case sensitive.
+	Platforms []string `json:"platforms,omitempty"`
+}
+
+// PlatformSupported returns true if this template supports the
+// currently running platform
+func (m *TemplateMetadata) PlatformSupported() bool {
+
+	// Default is all platforms supported
+	if len(m.Platforms) == 0 {
+		return true
+	}
+
+	// Check that the platform is in the list
+	platformsSupported := slicer.String(m.Platforms)
+	return platformsSupported.Contains(runtime.GOOS)
 }
 
 // TemplateDependency defines a binary dependency for the template
@@ -128,11 +149,11 @@ func (t *TemplateHelper) GetTemplateDetails() (map[string]*TemplateDetails, erro
 		result[name] = &TemplateDetails{
 			Path: dir,
 		}
-		_ = &TemplateMetadata{}
 		metadata, err := t.LoadMetadata(dir)
 		if err != nil {
 			return nil, err
 		}
+
 		result[name].Metadata = metadata
 		if metadata.Name != "" {
 			result[name].Name = metadata.Name

cmd/wails/4_build.go

@@ -78,6 +78,11 @@ func init() {
 			return fmt.Errorf("Unable to find 'project.json'. Please check you are in a Wails project directory")
 		}
 
+		// Check that this platform is supported
+		if !projectOptions.PlatformSupported() {
+			logger.Yellow("WARNING: This project is unsupported on %s - it probably won't work!\n         Valid platforms: %s\n", runtime.GOOS, strings.Join(projectOptions.Platforms, ", "))
+		}
+
 		// Set cross-compile
 		projectOptions.Platform = runtime.GOOS
 		if len(platform) > 0 {