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cmd/gio: add -target=js support for creating webassembly packages

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Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2019-06-09 14:48:15 +02:00
parent 3c345a67b8
commit 441ca835c3
2 changed files with 83 additions and 3 deletions
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cmd/gio/gio.go
+7 -3
View File
@@ -14,10 +14,10 @@ import (
)
var (
target = flag.String("target", "", "specify target (ios, tvos, android)")
target = flag.String("target", "", "specify target (ios, tvos, android, js)")
archNames = flag.String("arch", "", "specify architecture(s) to include")
buildMode = flag.String("buildmode", "archive", "specify buildmode: archive or exe")
destPath = flag.String("o", "", "output file (Android .aar or .apk file) or directory (iOS/tvOS .framework)")
destPath = flag.String("o", "", "output file (Android .aar or .apk file) or directory (iOS/tvOS .framework or webassembly files)")
appID = flag.String("appid", "org.gioui.app", "app identifier (for -buildmode=exe)")
verbose = flag.Bool("v", false, "verbose output")
)
@@ -46,7 +46,7 @@ func main() {
os.Exit(2)
}
switch *target {
case "ios", "tvos", "android":
case "ios", "tvos", "android", "js":
default:
errorf("invalid -target %s\n", *target)
}
@@ -64,6 +64,8 @@ func main() {
pkg: pkg,
}
switch *target {
case "js":
bi.archs = []string{"wasm"}
case "ios", "tvos":
// Only 64-bit support.
bi.archs = []string{"arm64", "amd64"}
@@ -89,6 +91,8 @@ func build(bi *buildInfo) error {
}
defer os.RemoveAll(tmpDir)
switch *target {
case "js":
return buildJS(bi)
case "ios", "tvos":
return buildIOS(tmpDir, *target, bi)
case "android":
cmd/gio/jsbuild.go
+76
View File
@@ -0,0 +1,76 @@
// SPDX-License-Identifier: Unlicense OR MIT
package main
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
)
func buildJS(bi *buildInfo) error {
out := *destPath
if out == "" {
out = filepath.Base(bi.pkg)
}
if err := os.MkdirAll(out, 0700); err != nil {
return err
}
cmd := exec.Command(
"go",
"build",
"-o", filepath.Join(out, "main.wasm"),
bi.pkg,
)
cmd.Env = append(
os.Environ(),
"GOOS=js",
"GOARCH=wasm",
)
_, err := runCmd(cmd)
if err != nil {
return err
}
const indexhtml = `<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no">
<meta name="mobile-web-app-capable" content="yes">
<script src="wasm_exec.js"></script>
<script>
if (!WebAssembly.instantiateStreaming) { // polyfill
WebAssembly.instantiateStreaming = async (resp, importObject) => {
const source = await (await resp).arrayBuffer();
return await WebAssembly.instantiate(source, importObject);
};
}
const go = new Go();
WebAssembly.instantiateStreaming(fetch("main.wasm"), go.importObject).then((result) => {
go.run(result.instance);
});
</script>
<style>
body,pre { margin:0;padding:0; }
</style>
</head>
<body>
<div id="giowindow"></div>
</body>
</html>`
if err := ioutil.WriteFile(filepath.Join(out, "index.html"), []byte(indexhtml), 0600); err != nil {
return err
}
goroot, err := runCmd(exec.Command("go", "env", "GOROOT"))
if err != nil {
return err
}
wasmjs := filepath.Join(goroot, "misc", "wasm", "wasm_exec.js")
if _, err := os.Stat(wasmjs); err != nil {
return fmt.Errorf("failed to find $GOROOT/misc/wasm/wasm_exec.js driver: %v", err)
}
return copyFile(filepath.Join(out, "wasm_exec.js"), wasmjs)
}