feat: component manager generator refactor: remove unused component managers and update component references

cmd/component/component.go

@@ -0,0 +1,196 @@
+// component.go: Go code generator for ECS component managers
+// Usage: go run component.go
+// Scans for structs with '//go:generate go tool component' and generates ids.go and managers.go
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+// Accepts: -shared, -std, -example in any combination/order
+var (
+	generateRe = regexp.MustCompile(`//go:generate go tool component((?: -[a-z]+)*)`)
+)
+
+type Component struct {
+	StructName string
+	File       string
+	Shared     bool
+	Std        bool
+	Example    bool
+}
+
+func main() {
+	_, err := os.Getwd()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to get working directory: %v\n", err)
+		os.Exit(1)
+	}
+
+	files, err := filepath.Glob("*.go")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to list Go files: %v\n", err)
+		os.Exit(1)
+	}
+
+	var components []Component
+	for _, file := range files {
+		if strings.HasSuffix(file, "_test.go") {
+			continue
+		}
+		comps := processFile(file)
+		components = append(components, comps...)
+	}
+
+	if len(components) > 0 {
+		generateIdsGo(components)
+		generateManagersGo(components)
+	}
+}
+
+// processFile parses a Go file and returns all components with a go:generate comment.
+func processFile(filename string) []Component {
+	fset := token.NewFileSet()
+	fileAst, err := parser.ParseFile(fset, filename, nil, parser.ParseComments)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to parse %s: %v\n", filename, err)
+		return nil
+	}
+
+	// Map line number to comment text
+	comments := map[int]string{}
+	for _, cg := range fileAst.Comments {
+		for _, c := range cg.List {
+			comments[fset.Position(c.Pos()).Line] = c.Text
+		}
+	}
+
+	var components []Component
+	for _, decl := range fileAst.Decls {
+		gd, ok := decl.(*ast.GenDecl)
+		if !ok || gd.Tok != token.TYPE {
+			continue
+		}
+		for _, spec := range gd.Specs {
+			ts, ok := spec.(*ast.TypeSpec)
+			if !ok {
+				continue
+			}
+			// Accept both struct and type alias
+			if _, ok := ts.Type.(*ast.StructType); !ok {
+				if _, ok := ts.Type.(*ast.Ident); !ok {
+					continue
+				}
+			}
+			// Check for go:generate comment immediately above
+			line := fset.Position(gd.Pos()).Line - 1
+			comment, ok := comments[line]
+			if !ok {
+				continue
+			}
+			matches := generateRe.FindStringSubmatch(comment)
+			if matches == nil {
+				continue
+			}
+			flags := matches[1]
+			// Split flags by space and check for each
+			flagSet := map[string]bool{}
+			for _, f := range strings.Fields(flags) {
+				flagSet[f] = true
+			}
+			components = append(components, Component{
+				StructName: ts.Name.Name,
+				File:       filename,
+				Shared:     flagSet["-shared"],
+				Std:        flagSet["-std"],
+				Example:    flagSet["-example"],
+			})
+		}
+	}
+	return components
+}
+
+// generateIdsGo creates ids.go for the detected components.
+func generateIdsGo(components []Component) {
+	if len(components) == 0 {
+		return
+	}
+	pkgName := getPackageName(components[0].File)
+	var buf bytes.Buffer
+	buf.WriteString("// Code generated by component generator; DO NOT EDIT.\n")
+	buf.WriteString("\npackage " + pkgName + "\n\n")
+	buf.WriteString("import (\n")
+	if anyExample(components) {
+		buf.WriteString("\t\"gomp/stdcomponents\"\n")
+	} else {
+		buf.WriteString("\t\"gomp/pkg/ecs\"\n")
+	}
+	buf.WriteString(")\n\n")
+	buf.WriteString("const (\n")
+	if components[0].Example {
+		buf.WriteString("\t" + components[0].StructName + "ComponentId = iota + stdcomponents.StdLastComponentId\n")
+		for i := 1; i < len(components); i++ {
+			buf.WriteString("\t" + components[i].StructName + "ComponentId\n")
+		}
+	} else {
+		buf.WriteString("\tInvalidComponentId ecs.ComponentId = iota\n")
+		for _, c := range components {
+			buf.WriteString("\t" + c.StructName + "ComponentId\n")
+		}
+		buf.WriteString("\tStdLastComponentId\n")
+	}
+	buf.WriteString(")\n\n")
+	_ = os.WriteFile("ids.go", buf.Bytes(), 0644)
+}
+
+// getPackageName returns the package name for a Go file.
+func getPackageName(filename string) string {
+	fset := token.NewFileSet()
+	fileAst, err := parser.ParseFile(fset, filename, nil, parser.PackageClauseOnly)
+	if err != nil {
+		return "main"
+	}
+	return fileAst.Name.Name
+}
+
+// anyExample returns true if any component is marked as -example.
+func anyExample(components []Component) bool {
+	for _, c := range components {
+		if c.Example {
+			return true
+		}
+	}
+	return false
+}
+
+// generateManagersGo creates managers.go for the detected components.
+func generateManagersGo(components []Component) {
+	if len(components) == 0 {
+		return
+	}
+	pkgName := getPackageName(components[0].File)
+	var buf bytes.Buffer
+	buf.WriteString("// Code generated by componentgen; DO NOT EDIT.\n")
+	buf.WriteString("\npackage " + pkgName + "\n\n")
+	buf.WriteString("import (\n\t\"gomp/pkg/ecs\"\n)\n\n")
+
+	for _, c := range components {
+		if c.Shared {
+			buf.WriteString(fmt.Sprintf("type %[1]sComponentManager = ecs.SharedComponentManager[%[1]s]\n\n", c.StructName))
+			buf.WriteString(fmt.Sprintf("func New%[1]sComponentManager() %[1]sComponentManager {\n\treturn ecs.NewSharedComponentManager[%[1]s](%[1]sComponentId)\n}\n\n", c.StructName))
+		} else {
+			buf.WriteString(fmt.Sprintf("type %[1]sComponentManager = ecs.ComponentManager[%[1]s]\n\n", c.StructName))
+			buf.WriteString(fmt.Sprintf("func New%[1]sComponentManager() %[1]sComponentManager {\n\treturn ecs.NewComponentManager[%[1]s](%[1]sComponentId)\n}\n\n", c.StructName))
+		}
+	}
+	_ = os.WriteFile("managers.go", buf.Bytes(), 0644)
+}

desktop-components.go

@@ -31,7 +31,7 @@ func NewDesktopComponents() DesktopComponents {
 		Tint:            stdcomponents.NewTintComponentManager(),
 		AnimationPlayer: stdcomponents.NewAnimationPlayerComponentManager(),
 		AnimationState:  stdcomponents.NewAnimationStateComponentManager(),
-		RlTexturePro:    stdcomponents.NewRlTextureProComponentManager(),
+		RlTexturePro:    stdcomponents.NewRLTextureProComponentManager(),
 		Network:         stdcomponents.NewNetworkComponentManager(),
 	}
 }

examples/new-api/components/asteroid-scene-manager.go

@@ -14,15 +14,8 @@ Thank you for your support!
 
 package components
 
-import "gomp/pkg/ecs"
-
+//go:generate go tool component -example
 type AsteroidSceneManager struct {
 	PlayerScore int32
 	PlayerHp    int32
 }
-
-type AsteroidSceneManagerComponentManager = ecs.ComponentManager[AsteroidSceneManager]
-
-func NewAsteroidSceneManagerComponentManager() AsteroidSceneManagerComponentManager {
-	return ecs.NewComponentManager[AsteroidSceneManager](AsteroidSceneManagerComponentId)
-}

examples/new-api/components/asteroid-tag.go

@@ -14,13 +14,6 @@ Thank you for your support!
 
 package components
 
-import "gomp/pkg/ecs"
-
+//go:generate go tool component -example
 type AsteroidTag struct {
 }
-
-type AsteroidComponentManager = ecs.ComponentManager[AsteroidTag]
-
-func NewAsteroidTagComponentManager() AsteroidComponentManager {
-	return ecs.NewComponentManager[AsteroidTag](AsteroidTagComponentId)
-}

examples/new-api/components/audio.go

@@ -16,9 +16,9 @@ package components
 
 import (
 	rl "github.com/gen2brain/raylib-go/raylib"
-	"gomp/pkg/ecs"
 )
 
+//go:generate go tool component -example
 type SoundEffect struct {
 	// audio clip from assets
 	Clip *rl.Sound
@@ -34,21 +34,10 @@ type SoundEffect struct {
 	Pan float32
 }
 
-type SoundEffectsComponentManager = ecs.ComponentManager[SoundEffect]
-
-func NewSoundEffectsComponentManager() SoundEffectsComponentManager {
-	return ecs.NewComponentManager[SoundEffect](SoundEffectManagerComponentId)
-}
-
+//go:generate go tool component -example
 type SpatialAudio struct {
 	// follows raylib rules. Base is 1.0
 	Volume float32
 	// follows raylib rules. Base is 0.5, 1.0 is left, 0.0 is right
 	Pan float32
 }
-
-type SpatialAudioComponentManager = ecs.ComponentManager[SpatialAudio]
-
-func NewSpatialAudioComponentManager() SpatialAudioComponentManager {
-	return ecs.NewComponentManager[SpatialAudio](SpatialAudioManagerComponentId)
-}

examples/new-api/components/bullet-tag.go

@@ -14,13 +14,6 @@ Thank you for your support!
 
 package components
 
-import "gomp/pkg/ecs"
-
+//go:generate go tool component -example
 type BulletTag struct {
 }
-
-type BulletTagComponentManager = ecs.ComponentManager[BulletTag]
-
-func NewBulletTagComponentManager() BulletTagComponentManager {
-	return ecs.NewComponentManager[BulletTag](BulletTagComponentId)
-}

examples/new-api/components/controller.go

@@ -14,12 +14,5 @@ Thank you for your support!
 
 package components
 
-import "gomp/pkg/ecs"
-
+//go:generate go tool component -example
 type Controller struct{}
-
-type ControllerComponentManager = ecs.ComponentManager[Controller]
-
-func NewControllerComponentManager() ControllerComponentManager {
-	return ecs.NewComponentManager[Controller](ControllerComponentId)
-}

examples/new-api/components/hp.go

@@ -14,14 +14,7 @@ Thank you for your support!
 
 package components
 
-import "gomp/pkg/ecs"
-
+//go:generate go tool component -example
 type Hp struct {
 	Hp, MaxHp int32
 }
-
-type HpComponentManager = ecs.ComponentManager[Hp]
-
-func NewHealthComponentManager() HpComponentManager {
-	return ecs.NewComponentManager[Hp](HealthComponentId)
-}