Replace mention of plugins with extensions

Closes #7

README.md

@@ -97,7 +97,7 @@ The race detector can be enabled by setting `XK6_RACE_DETECTOR=1`.
 ```go
 builder := xk6.Builder{
 	k6Version: "v0.29.0",
-	Plugins: []xk6.Dependency{
+	Extensions: []xk6.Dependency{
 		{
 			ModulePath: "github.com/k6io/xk6-sql",
 			Version:    "v0.0.1",

builder.go

@@ -36,7 +36,7 @@ import (
 type Builder struct {
 	Compile
 	K6Version    string        `json:"k6_version,omitempty"`
-	Plugins      []Dependency  `json:"plugins,omitempty"`
+	Extensions   []Dependency  `json:"extensions,omitempty"`
 	Replacements []Replace     `json:"replacements,omitempty"`
 	TimeoutGet   time.Duration `json:"timeout_get,omitempty"`
 	TimeoutBuild time.Duration `json:"timeout_build,omitempty"`
@@ -45,7 +45,7 @@ type Builder struct {
 }
 
 // Build builds k6 at the configured version with the
-// configured plugins and plops down a binary at outputFile.
+// configured extensions and writes a binary at outputFile.
 func (b Builder) Build(ctx context.Context, outputFile string) error {
 	if outputFile == "" {
 		return fmt.Errorf("output file path is required")

cmd/xk6/main.go

@@ -55,7 +55,7 @@ func main() {
 func runBuild(ctx context.Context, args []string) error {
 	// parse the command line args... rather primitively
 	var argK6Version, output string
-	var plugins []xk6.Dependency
+	var extensions []xk6.Dependency
 	var replacements []xk6.Replace
 	for i := 0; i < len(args); i++ {
 		switch args[i] {
@@ -69,7 +69,7 @@ func runBuild(ctx context.Context, args []string) error {
 				return err
 			}
 			mod = strings.TrimSuffix(mod, "/") // easy to accidentally leave a trailing slash if pasting from a URL, but is invalid for Go modules
-			plugins = append(plugins, xk6.Dependency{
+			extensions = append(extensions, xk6.Dependency{
 				PackagePath: mod,
 				Version:     ver,
 			})
@@ -115,7 +115,7 @@ func runBuild(ctx context.Context, args []string) error {
 			Cgo: os.Getenv("CGO_ENABLED") == "1",
 		},
 		K6Version:    k6Version,
-		Plugins:      plugins,
+		Extensions:   extensions,
 		Replacements: replacements,
 		RaceDetector: raceDetector,
 		SkipCleanup:  skipCleanup,
@@ -214,7 +214,7 @@ func runDev(ctx context.Context, args []string) error {
 			Cgo: os.Getenv("CGO_ENABLED") == "1",
 		},
 		K6Version: k6Version,
-		Plugins: []xk6.Dependency{
+		Extensions: []xk6.Dependency{
 			{PackagePath: importPath},
 		},
 		Replacements: replacements,

environment.go

@@ -35,8 +35,8 @@ func (b Builder) newEnvironment(ctx context.Context) (*environment, error) {
 	}
 
 	// clean up any SIV-incompatible module paths real quick
-	for i, p := range b.Plugins {
-		b.Plugins[i].PackagePath, err = versionedModulePath(p.PackagePath, p.Version)
+	for i, p := range b.Extensions {
+		b.Extensions[i].PackagePath, err = versionedModulePath(p.PackagePath, p.Version)
 		if err != nil {
 			return nil, err
 		}
@@ -46,8 +46,8 @@ func (b Builder) newEnvironment(ctx context.Context) (*environment, error) {
 	tplCtx := goModTemplateContext{
 		K6Module: k6ModulePath,
 	}
-	for _, p := range b.Plugins {
-		tplCtx.Plugins = append(tplCtx.Plugins, p.PackagePath)
+	for _, p := range b.Extensions {
+		tplCtx.Extensions = append(tplCtx.Extensions, p.PackagePath)
 	}
 
 	// evaluate the template for the main module
@@ -86,7 +86,7 @@ func (b Builder) newEnvironment(ctx context.Context) (*environment, error) {
 
 	env := &environment{
 		k6Version:    b.K6Version,
-		plugins:      b.Plugins,
+		extensions:   b.Extensions,
 		k6ModulePath: k6ModulePath,
 		tempFolder:   tempFolder,
 		timeoutGoGet: b.TimeoutGet,
@@ -121,21 +121,21 @@ func (b Builder) newEnvironment(ctx context.Context) (*environment, error) {
 	default:
 	}
 
-	// pin versions by populating go.mod, first for k6 itself and then plugins
+	// pin versions by populating go.mod, first for k6 itself and then extensions
 	log.Println("[INFO] Pinning versions")
 	err = env.execGoGet(ctx, k6ModulePath, env.k6Version)
 	if err != nil {
 		return nil, err
 	}
-nextPlugin:
-	for _, p := range b.Plugins {
+nextExt:
+	for _, p := range b.Extensions {
 		// if module is locally available, do not "go get" it;
 		// also note that we iterate and check prefixes, because
-		// a plugin package may be a subfolder of a module, i.e.
-		// foo/a/plugin is within module foo/a.
+		// an extension package may be a subfolder of a module, i.e.
+		// foo/a/extension is within module foo/a.
 		for repl := range replaced {
 			if strings.HasPrefix(p.PackagePath, repl) {
-				continue nextPlugin
+				continue nextExt
 			}
 		}
 		err = env.execGoGet(ctx, p.PackagePath, p.Version)
@@ -157,7 +157,7 @@ nextPlugin:
 
 type environment struct {
 	k6Version    string
-	plugins      []Dependency
+	extensions   []Dependency
 	k6ModulePath string
 	tempFolder   string
 	timeoutGoGet time.Duration
@@ -239,8 +239,8 @@ func (env environment) execGoGet(ctx context.Context, modulePath, moduleVersion
 }
 
 type goModTemplateContext struct {
-	K6Module string
-	Plugins  []string
+	K6Module   string
+	Extensions []string
 }
 
 const mainModuleTemplate = `package main
@@ -251,7 +251,7 @@ import (
 	// plug in k6 modules here
 	// TODO: Create /modules/standard dir structure?
 	// _ "{{.K6Module}}/modules/standard"
-	{{- range .Plugins}}
+	{{- range .Extensions}}
 	_ "{{.}}"
 	{{- end}}
 )