internal/gamepaddb: rename template variable for consistency, fix

initialism

cmd/ebitenmobile/main.go

@@ -54,11 +54,6 @@ func goEnv(name string) string {
 	return strings.TrimSpace(string(val))
 }
 
-const (
-	// Copied from gomobile.
-	minAndroidAPI = 15
-)
-
 var (
 	buildA          bool   // -a
 	buildI          bool   // -i
@@ -99,6 +94,11 @@ func main() {
 		flag.Usage()
 	}
 
+	// minAndroidAPI specifies the minimum API version for Android.
+	// Now Google Player v23.30.99+ drops API levels that are older than 21.
+	// See https://apilevels.com/.
+	const minAndroidAPI = 21
+
 	var flagset flag.FlagSet
 	flagset.StringVar(&buildO, "o", "", "")
 	flagset.StringVar(&buildGcflags, "gcflags", "", "")
@@ -150,6 +150,20 @@ func main() {
 		log.Fatal(err)
 	}
 
+	// If args doesn't include '-androidapi', set it to args explicitly.
+	// It's because ebitenmobile's default API level is different from gomobile's one.
+	if buildTarget == "android" && buildAndroidAPI == minAndroidAPI {
+		var found bool
+		flag.Visit(func(f *flag.Flag) {
+			if f.Name == "androidapi" {
+				found = true
+			}
+		})
+		if !found {
+			args = append([]string{args[0], "-androidapi", fmt.Sprintf("%d", minAndroidAPI)}, args[1:]...)
+		}
+	}
+
 	if err := doBind(args, &flagset, buildTarget); err != nil {
 		log.Fatal(err)
 	}
@@ -251,7 +265,7 @@ func doBind(args []string, flagset *flag.FlagSet, buildOS string) error {
 			// TODO: strings.Title is used here for the consistency with gomobile (see cmd/gomobile/bind_iosapp.go).
 			// As strings.Title is deprecated, golang.org/x/text/cases should be used.
 			frameworkNameBase = strings.Title(frameworkNameBase)
-			dir := filepath.Join(buildO, name, frameworkNameBase+".framework", "Versions", "A")
+			dir := filepath.Join(buildO, name, frameworkNameBase+".framework")
 
 			if err := os.WriteFile(filepath.Join(dir, "Headers", prefixUpper+"EbitenViewController.h"), []byte(replacePrefixes(objcH)), 0644); err != nil {
 				return err

exp/textinput/textinput.go

@@ -47,7 +47,7 @@ type State struct {
 // Start starts text inputting.
 // Start returns a channel to send the state repeatedly, and a function to end the text inputting.
 //
-// Start is the low-leve API. For most use cases, Field is easier to use.
+// Start is the low-level API. For most use cases, Field is easier to use.
 //
 // Start returns nil and nil if the current environment doesn't support this package.
 func Start(x, y int) (states chan State, close func()) {

genkeys.go

@@ -576,7 +576,7 @@ const uiGLFWKeysTmpl = `{{.License}}
 
 {{.DoNotEdit}}
 
-{{.BuildTag}}
+{{.BuildConstraints}}
 
 package ui
 
@@ -594,7 +594,7 @@ const uiJSKeysTmpl = `{{.License}}
 
 {{.DoNotEdit}}
 
-{{.BuildTag}}
+{{.BuildConstraints}}
 
 package ui
 
@@ -612,7 +612,7 @@ const glfwKeysTmpl = `{{.License}}
 
 {{.DoNotEdit}}
 
-{{.BuildTag}}
+{{.BuildConstraints}}
 
 package glfw
 
@@ -626,7 +626,7 @@ const mobileAndroidKeysTmpl = `{{.License}}
 
 {{.DoNotEdit}}
 
-{{.BuildTag}}
+{{.BuildConstraints}}
 
 package ebitenmobileview
 
@@ -644,7 +644,7 @@ const mobileIOSKeysTmpl = `{{.License}}
 
 {{.DoNotEdit}}
 
-{{.BuildTag}}
+{{.BuildConstraints}}
 
 package ebitenmobileview
 
@@ -799,20 +799,20 @@ func main() {
 
 		// The build tag can't be included in the templates because of `go vet`.
 		// Pass the build tag and extract this in the template to make `go vet` happy.
-		buildTag := ""
+		buildConstraints := ""
 		switch path {
 		case filepath.Join("internal", "glfw", "keys.go"):
-			buildTag = "//go:build darwin || freebsd || linux || netbsd || openbsd || windows"
+			buildConstraints = "//go:build darwin || freebsd || linux || netbsd || openbsd || windows"
 		case filepath.Join("internal", "ui", "keys_mobile.go"):
-			buildTag = "//go:build android || ios"
+			buildConstraints = "//go:build android || ios"
 		case filepath.Join("internal", "ui", "keys_glfw.go"):
-			buildTag = "//go:build !android && !ios && !js && !nintendosdk && !playstation5"
+			buildConstraints = "//go:build !android && !ios && !js && !nintendosdk && !playstation5"
 		}
 		// NOTE: According to godoc, maps are automatically sorted by key.
 		if err := tmpl.Execute(f, struct {
 			License                         string
 			DoNotEdit                       string
-			BuildTag                        string
+			BuildConstraints                string
 			UIKeyNameToJSCode               map[string]string
 			EbitengineKeyNames              []string
 			EbitengineKeyNamesWithoutOld    []string
@@ -826,7 +826,7 @@ func main() {
 		}{
 			License:                         license,
 			DoNotEdit:                       doNotEdit,
-			BuildTag:                        buildTag,
+			BuildConstraints:                buildConstraints,
 			UIKeyNameToJSCode:               uiKeyNameToJSCode,
 			EbitengineKeyNames:              ebitengineKeyNames,
 			EbitengineKeyNamesWithoutOld:    ebitengineKeyNamesWithoutOld,

go.mod

@@ -3,11 +3,11 @@ module github.com/hajimehoshi/ebiten/v2
 go 1.18
 
 require (
-	github.com/ebitengine/gomobile v0.0.0-20240320163605-0b2c67584a2b
+	github.com/ebitengine/gomobile v0.0.0-20240327025426-b04d93b1a983
 	github.com/ebitengine/hideconsole v1.0.0
-	github.com/ebitengine/oto/v3 v3.2.0-alpha.4
-	github.com/ebitengine/purego v0.7.0-alpha.3
-	github.com/go-text/typesetting v0.1.1-0.20240319115800-09fd9aa0cd1b
+	github.com/ebitengine/oto/v3 v3.3.0-alpha
+	github.com/ebitengine/purego v0.8.0-alpha
+	github.com/go-text/typesetting v0.1.1-0.20240325125605-c7936fe59984
 	github.com/hajimehoshi/bitmapfont/v3 v3.0.0
 	github.com/hajimehoshi/go-mp3 v0.3.4
 	github.com/jakecoffman/cp v1.2.1

go.sum

@@ -1,13 +1,13 @@
-github.com/ebitengine/gomobile v0.0.0-20240320163605-0b2c67584a2b h1:ccykWd0kO+TooxL9yKfKsI3RB/yK+k/a4vdlA4Q9th8=
-github.com/ebitengine/gomobile v0.0.0-20240320163605-0b2c67584a2b/go.mod h1:tWboRRNagZwwwis4QIgEFG1ZNFwBJ3LAhSLAXAAxobQ=
+github.com/ebitengine/gomobile v0.0.0-20240327025426-b04d93b1a983 h1:hHib1v7Z+pXVENSB5x3EF8eQJThPhRfj35RymJFVgm0=
+github.com/ebitengine/gomobile v0.0.0-20240327025426-b04d93b1a983/go.mod h1:tWboRRNagZwwwis4QIgEFG1ZNFwBJ3LAhSLAXAAxobQ=
 github.com/ebitengine/hideconsole v1.0.0 h1:5J4U0kXF+pv/DhiXt5/lTz0eO5ogJ1iXb8Yj1yReDqE=
 github.com/ebitengine/hideconsole v1.0.0/go.mod h1:hTTBTvVYWKBuxPr7peweneWdkUwEuHuB3C1R/ielR1A=
-github.com/ebitengine/oto/v3 v3.2.0-alpha.4 h1:aaUdcbEDUV1oErHDv/Cd0IAjQaQPChZuvO8Cn/kQHE8=
-github.com/ebitengine/oto/v3 v3.2.0-alpha.4/go.mod h1:JtMbxJHZBDXfS8BmVYwzWk9Z6r7jsjwsHzOuZrEkfs4=
-github.com/ebitengine/purego v0.7.0-alpha.3 h1:9hH1aneqLaM3sM+PMUgRJVsMe2SqfVjZtV3DEzxBDJU=
-github.com/ebitengine/purego v0.7.0-alpha.3/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
-github.com/go-text/typesetting v0.1.1-0.20240319115800-09fd9aa0cd1b h1:CPNyzp2f5+D9FDN7yT6pXWTDAmpnpjnWi5jt3bKPJyA=
-github.com/go-text/typesetting v0.1.1-0.20240319115800-09fd9aa0cd1b/go.mod h1:2+owI/sxa73XA581LAzVuEBZ3WEEV2pXeDswCH/3i1I=
+github.com/ebitengine/oto/v3 v3.3.0-alpha h1:XxKkEhWl1w5zK9TjPwod+vZeTU91pXYYSooAGk9ya8o=
+github.com/ebitengine/oto/v3 v3.3.0-alpha/go.mod h1:T2/VV0UWG97GEEf4kORMU2nCneYT/YmwSTxPutSVaUg=
+github.com/ebitengine/purego v0.8.0-alpha h1:xWsUo8xQZLH8f9TzXXSvs/qjc2s6rhNGYxEo5Qd10so=
+github.com/ebitengine/purego v0.8.0-alpha/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
+github.com/go-text/typesetting v0.1.1-0.20240325125605-c7936fe59984 h1:NwCC36eQsDf1xVZG9jD7ngXNNjsvk8KXky15ogA1Vo0=
+github.com/go-text/typesetting v0.1.1-0.20240325125605-c7936fe59984/go.mod h1:2+owI/sxa73XA581LAzVuEBZ3WEEV2pXeDswCH/3i1I=
 github.com/go-text/typesetting-utils v0.0.0-20240317173224-1986cbe96c66 h1:GUrm65PQPlhFSKjLPGOZNPNxLCybjzjYBzjfoBGaDUY=
 github.com/hajimehoshi/bitmapfont/v3 v3.0.0 h1:r2+6gYK38nfztS/et50gHAswb9hXgxXECYgE8Nczmi4=
 github.com/hajimehoshi/bitmapfont/v3 v3.0.0/go.mod h1:+CxxG+uMmgU4mI2poq944i3uZ6UYFfAkj9V6WqmuvZA=

internal/gamepaddb/db_android.go

@@ -1,4 +1,3 @@
-
 // Copyright 2024 The Ebitengine Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,20 +12,28 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-
 // Code generated by gen.go using 'go generate'. DO NOT EDIT.
 
 //go:build android
 
 package gamepaddb
 
-import _ "embed"
+import (
+	_ "embed"
+)
 
 //go:embed gamecontrollerdb_android.txt
 var controllerBytes []byte
 
+//go:embed gamecontrollerdb_glfw.txt
+var glfwControllerBytes []byte
+
 func init() {
 	if err := Update(controllerBytes); err != nil {
 		panic(err)
 	}
+
+	if err := Update(glfwControllerBytes); err != nil {
+		panic(err)
+	}
 }

internal/gamepaddb/db_ios.go

@@ -1,4 +1,3 @@
-
 // Copyright 2024 The Ebitengine Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,20 +12,28 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-
 // Code generated by gen.go using 'go generate'. DO NOT EDIT.
 
 //go:build ios
 
 package gamepaddb
 
-import _ "embed"
+import (
+	_ "embed"
+)
 
 //go:embed gamecontrollerdb_ios.txt
 var controllerBytes []byte
 
+//go:embed gamecontrollerdb_glfw.txt
+var glfwControllerBytes []byte
+
 func init() {
 	if err := Update(controllerBytes); err != nil {
 		panic(err)
 	}
+
+	if err := Update(glfwControllerBytes); err != nil {
+		panic(err)
+	}
 }

internal/gamepaddb/db_linbsd.go

@@ -1,4 +1,3 @@
-
 // Copyright 2024 The Ebitengine Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,20 +12,28 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-
 // Code generated by gen.go using 'go generate'. DO NOT EDIT.
 
 //go:build (freebsd || (linux && !android) || netbsd || openbsd) && !nintendosdk && !playstation5
 
 package gamepaddb
 
-import _ "embed"
+import (
+	_ "embed"
+)
 
 //go:embed gamecontrollerdb_linbsd.txt
 var controllerBytes []byte
 
+//go:embed gamecontrollerdb_glfw.txt
+var glfwControllerBytes []byte
+
 func init() {
 	if err := Update(controllerBytes); err != nil {
 		panic(err)
 	}
+
+	if err := Update(glfwControllerBytes); err != nil {
+		panic(err)
+	}
 }

internal/gamepaddb/db_macos_darwin.go

@@ -1,4 +1,3 @@
-
 // Copyright 2024 The Ebitengine Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,20 +12,28 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-
 // Code generated by gen.go using 'go generate'. DO NOT EDIT.
 
 //go:build darwin && !ios
 
 package gamepaddb
 
-import _ "embed"
+import (
+	_ "embed"
+)
 
 //go:embed gamecontrollerdb_macos_darwin.txt
 var controllerBytes []byte
 
+//go:embed gamecontrollerdb_glfw.txt
+var glfwControllerBytes []byte
+
 func init() {
 	if err := Update(controllerBytes); err != nil {
 		panic(err)
 	}
+
+	if err := Update(glfwControllerBytes); err != nil {
+		panic(err)
+	}
 }

internal/gamepaddb/db_windows.go

@@ -1,4 +1,3 @@
-
 // Copyright 2024 The Ebitengine Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,14 +12,15 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-
 // Code generated by gen.go using 'go generate'. DO NOT EDIT.
 
 //go:build windows && !microsoftgdk
 
 package gamepaddb
 
-import _ "embed"
+import (
+	_ "embed"
+)
 
 //go:embed gamecontrollerdb_windows.txt
 var controllerBytes []byte

internal/gamepaddb/gamecontrollerdb_android.txt

@@ -287,4 +287,3 @@
 050000005e040000130b0000ffff3f00,Xbox Series Controller,a:b0,b:b1,back:b15,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b9,leftstick:b7,lefttrigger:a4,leftx:a0,lefty:a1,rightshoulder:b10,rightstick:b8,righttrigger:a5,rightx:a2,righty:a3,start:b6,x:b2,y:b3,platform:Android,
 65633038363832353634653836396239,Xbox Series Controller,a:b0,b:b1,back:b15,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b5,leftshoulder:b9,leftstick:b7,lefttrigger:a4,leftx:a0,lefty:a1,rightshoulder:b10,rightstick:b8,righttrigger:a5,rightx:a2,righty:a3,start:b6,x:b2,y:b3,platform:Android,
 050000001727000044310000ffff3f00,XiaoMi Controller,a:b0,b:b1,back:b4,dpdown:b12,dpleft:b13,dpright:b14,dpup:b11,leftshoulder:b9,leftstick:b7,lefttrigger:a7,leftx:a0,lefty:a1,rightshoulder:b10,rightstick:b8,righttrigger:a6,rightx:a2,righty:a5,start:b6,x:b2,y:b3,platform:Android,
-

internal/gamepaddb/gamecontrollerdb_linbsd.txt

@@ -610,4 +610,3 @@
 xinput,XInput Controller,a:b0,b:b1,back:b6,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b8,leftshoulder:b4,leftstick:b9,lefttrigger:a2,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b10,righttrigger:a5,rightx:a3,righty:a4,start:b7,x:b2,y:b3,platform:Linux,
 03000000120c0000100e000011010000,Zeroplus P4,a:b1,b:b2,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b12,leftshoulder:b4,leftstick:b10,lefttrigger:a3,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:a4,rightx:a2,righty:a5,start:b9,x:b0,y:b3,platform:Linux,
 03000000120c0000101e000011010000,Zeroplus P4,a:b1,b:b2,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b12,leftshoulder:b4,leftstick:b10,lefttrigger:a3,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:a4,rightx:a2,righty:a5,start:b9,x:b0,y:b3,platform:Linux,
-

internal/gamepaddb/gamecontrollerdb_macos_darwin.txt

@@ -284,4 +284,3 @@
 03000000172700004431000029010000,XiaoMi Controller,a:b0,b:b1,back:b10,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b15,leftshoulder:b6,leftstick:b13,lefttrigger:b8,leftx:a0,lefty:a1,rightshoulder:b7,rightstick:b14,righttrigger:a6,rightx:a2,righty:a5,start:b11,x:b3,y:b4,platform:Mac OS X,
 03000000120c0000100e000000010000,Zeroplus P4,a:b1,b:b2,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b12,leftshoulder:b4,leftstick:b10,lefttrigger:a3,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:a4,rightx:a2,righty:a5,start:b9,x:b0,y:b3,platform:Mac OS X,
 03000000120c0000101e000000010000,Zeroplus P4,a:b1,b:b2,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b12,leftshoulder:b4,leftstick:b10,lefttrigger:a3,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:a4,rightx:a2,righty:a5,start:b9,x:b0,y:b3,platform:Mac OS X,
-

internal/gamepaddb/gamecontrollerdb_windows.txt

@@ -798,4 +798,3 @@ xinput,XInput Controller,a:b0,b:b1,back:b6,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,
 03000000790000004f18000000000000,ZDT Android Controller,a:b0,b:b1,back:b10,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b12,leftshoulder:b6,leftstick:b13,lefttrigger:b8,leftx:a0,lefty:a1,rightshoulder:b7,rightstick:b14,righttrigger:b9,rightx:a3,righty:a4,start:b11,x:b3,y:b4,platform:Windows,
 03000000120c00000500000000000000,Zeroplus Adapter,a:b2,b:b1,back:b11,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b6,leftstick:b9,lefttrigger:b4,leftx:a0,lefty:a1,rightshoulder:b7,rightstick:b0,righttrigger:b5,rightx:a3,righty:a2,start:b8,x:b3,y:b0,platform:Windows,
 03000000120c0000101e000000000000,Zeroplus P4 Gamepad,a:b1,b:b2,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b12,leftshoulder:b4,leftstick:b10,lefttrigger:a3,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:a4,rightx:a2,righty:a5,start:b9,x:b0,y:b3,platform:Windows,
-

internal/gamepaddb/gamepaddb.go

@@ -13,6 +13,8 @@
 // limitations under the License.
 
 //go:generate go run gen.go
+//go:generate gofmt -s -w .
+
 package gamepaddb
 
 import (

internal/gamepaddb/gen.go

@@ -14,11 +14,10 @@
 
 //go:build ignore
 
-// This program generates platform-specific controller dbs. It can be invoked by running
-// go generate
 package main
 
 import (
+	"bufio"
 	"bytes"
 	_ "embed"
 	"fmt"
@@ -50,134 +49,170 @@ const license = `// Copyright 2024 The Ebitengine Authors
 //     curl --location --remote-name https://raw.githubusercontent.com/mdqinc/SDL_GameControllerDB/master/gamecontrollerdb.txt
 
 //go:embed gamecontrollerdb.txt
-var gamecontrollerdb_txt []byte
+var gameControllerDB []byte
 
-const db_template string = `
-{{.License}}
+const dbTemplate string = `{{.License}}
 
 {{.DoNotEdit}}
 
-{{.BuildTag}}
+{{.BuildConstraints}}
 
 package gamepaddb
 
-import _ "embed"
+import (
+	_ "embed"
+)
 
-//go:embed gamecontrollerdb_{{.Platform}}.txt
+//go:embed gamecontrollerdb_{{.FileNameSuffix}}.txt
 var controllerBytes []byte
-{{if eq .Platform "windows" }} 
 //go:embed gamecontrollerdb_glfw.txt
 var glfwControllerBytes []byte
-{{end}}
+
 func init() {
 	if err := Update(controllerBytes); err != nil {
 		panic(err)
 	}
-{{if eq .Platform "windows" }} 
+
     if err := Update(glfwControllerBytes); err != nil {
         panic(err)
 	}
-{{end}}}`
+}`
 
 func main() {
+	if err := run(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func run() error {
 	// Follow the standard comment rule (https://pkg.go.dev/cmd/go#hdr-Generate_Go_files_by_processing_source).
 	doNotEdit := "// Code generated by gen.go using 'go generate'. DO NOT EDIT."
 
 	type gamePadPlatform struct {
-		name     string
-		buildTag string
+		filenameSuffix   string
+		buildConstraints string
 	}
 
 	supported := map[string]gamePadPlatform{
 		"Windows": {
-			name:     "windows",
-			buildTag: "//go:build windows && !microsoftgdk",
+			filenameSuffix:   "windows",
+			buildConstraints: "//go:build windows && !microsoftgdk",
 		},
 		"Mac OS X": {
-			name:     "macos_darwin",
-			buildTag: "//go:build darwin && !ios",
+			filenameSuffix:   "macos_darwin",
+			buildConstraints: "//go:build darwin && !ios",
 		},
 		"Linux": {
-			name:     "linbsd",
-			buildTag: "//go:build (freebsd || (linux && !android) || netbsd || openbsd) && !nintendosdk && !playstation5",
+			filenameSuffix:   "linbsd",
+			buildConstraints: "//go:build (freebsd || (linux && !android) || netbsd || openbsd) && !nintendosdk && !playstation5",
 		},
 		"iOS": {
-			name:     "ios",
-			buildTag: "//go:build ios",
+			filenameSuffix:   "ios",
+			buildConstraints: "//go:build ios",
 		},
 		"Android": {
-			name:     "android",
-			buildTag: "//go:build android",
+			filenameSuffix:   "android",
+			buildConstraints: "//go:build android",
 		},
 	}
 
-	// divide controller dbs into chunks by platform
-	controllerDbs := splitControllerDb(gamecontrollerdb_txt)
+	controllerDBs, err := splitControllersByPlatform(gameControllerDB)
+	if err != nil {
+		return err
+	}
 
 	for sdlName, platform := range supported {
-		controllerDb, ok := controllerDbs[sdlName]
+		controllerDB, ok := controllerDBs[sdlName]
 		if !ok {
-			log.Fatalf("failed to find controller db for platform %s in gamecontrollerdb_txt", sdlName)
+			return fmt.Errorf("failed to find controller db for platform %s in gamecontrollerdb_txt", sdlName)
 		}
 
 		// write each chunk into separate text file for embedding into respective generated files
-		txtFile, err := os.Create(fmt.Sprintf("gamecontrollerdb_%s.txt", platform.name))
+		txtFile, err := os.Create(fmt.Sprintf("gamecontrollerdb_%s.txt", platform.filenameSuffix))
 		if err != nil {
-			log.Fatalf("failed to open file: %v", err)
+			return fmt.Errorf("failed to open file: %v", err)
 		}
 		defer txtFile.Close()
-		written, err := txtFile.Write(controllerDb)
+		written, err := txtFile.Write(controllerDB)
 		if err != nil {
-			log.Fatalf("failed to write controller db for %s, expected to write %d bytes, wrote %d: %v", sdlName, len(controllerDb), written, err)
+			return fmt.Errorf("failed to write controller db for %s, expected to write %d bytes, wrote %d: %v", sdlName, len(controllerDB), written, err)
 		}
 
-		path := fmt.Sprintf("db_%s.go", platform.name)
-		tmpl, err := template.New(path).Parse(db_template)
+		path := fmt.Sprintf("db_%s.go", platform.filenameSuffix)
+		tmpl, err := template.New(path).Parse(dbTemplate)
 		if err != nil {
-			log.Fatalf("failed to parse template: %v", err)
+			return fmt.Errorf("failed to parse template: %v", err)
 		}
 
 		f, err := os.Create(path)
 		if err != nil {
-			log.Fatal(err)
+			return err
 		}
 		defer f.Close()
 
 		err = tmpl.Execute(f, struct {
 			License          string
 			DoNotEdit        string
-			BuildTag  string
-			Platform  string
+			BuildConstraints string
+			FileNameSuffix   string
 		}{
 			License:          license,
 			DoNotEdit:        doNotEdit,
-			BuildTag:  platform.buildTag,
-			Platform:  platform.name,
+			BuildConstraints: platform.buildConstraints,
+			FileNameSuffix:   platform.filenameSuffix,
 		})
 		if err != nil {
-			log.Fatal(err)
-		}
+			return err
 		}
 	}
 
-// splitControllerDb maps the game controller db into respective controller definition byte slices for
-// each platform
-func splitControllerDb(controllerDb []byte) map[string][]byte {
+	return nil
+}
+
+func splitControllersByPlatform(controllerDB []byte) (map[string][]byte, error) {
+	s := bufio.NewScanner(bytes.NewReader(controllerDB))
 	dbs := map[string][]byte{}
-	// split at #, skip first 3 header chunks
-	chunks := bytes.Split(controllerDb, []byte{'#'})[3:]
 
-	for _, chunk := range chunks {
-		// find each platform string
-		lines := bytes.Split(chunk, []byte{'\n'})
-		if len(lines) == 0 {
+	var currentPlatform string
+	buf := bytes.Buffer{}
+	for s.Scan() {
+		chunk := s.Bytes()
+		if len(chunk) == 0 {
 			continue
 		}
 
-		platform := strings.TrimSpace(string(lines[0]))
-		// count platform string len + space + newline
-		bytesRead := len(lines[0]) + 1
-		dbs[platform] = chunk[bytesRead:]
+		if chunk[0] == '#' {
+			if currentPlatform != "" && buf.Len() > 0 {
+				dbs[currentPlatform] = bytes.Clone(buf.Bytes())
+				buf.Reset()
 			}
-	return dbs
+
+			platform := strings.Replace(string(chunk), "# ", "", 1)
+			switch platform {
+			case "Windows":
+				currentPlatform = "Windows"
+			case "Mac OS X":
+				currentPlatform = "Mac OS X"
+			case "iOS":
+				currentPlatform = "iOS"
+			case "Android":
+				currentPlatform = "Android"
+			case "Linux":
+				currentPlatform = "Linux"
+			default:
+				continue
+			}
+		} else {
+			buf.Write(chunk)
+			buf.WriteByte('\n')
+		}
+	}
+	if currentPlatform != "" && buf.Len() > 0 {
+		dbs[currentPlatform] = bytes.Clone(buf.Bytes())
+	}
+	if err := s.Err(); err != nil {
+		return nil, err
+	}
+
+	return dbs, nil
 }