// 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 = bi.name
}
if err := os.MkdirAll(out, 0700); err != nil {
return err
}
cmd := exec.Command(
"go",
"build",
"-ldflags="+bi.ldflags,
"-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 = `
`
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)
}