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99 lines
1.7 KiB
Go
99 lines
1.7 KiB
Go
package reducer
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import (
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_ "embed"
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"fmt"
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"os"
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"os/exec"
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"path"
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"strings"
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)
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func CreateNodejs(args []string) *exec.Cmd {
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cmd := exec.Command("node", "--input-type=module", "-e", nodejs(args))
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nodePath, exist := os.LookupEnv("NODE_PATH")
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if exist {
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cmd.Dir = path.Dir(nodePath)
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}
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cmd.Env = os.Environ()
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cmd.Env = append(cmd.Env, "NODE_OPTIONS=--max-old-space-size=8192")
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workingDir, err := os.Getwd()
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if err == nil {
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cmd.Env = append(cmd.Env, "FX_CWD="+workingDir)
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}
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return cmd
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}
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//go:embed reduce.js
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var templateJs string
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func nodejs(args []string) string {
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rs := "\n"
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for i, a := range args {
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rs += " try {"
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switch {
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case a == ".":
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rs += `
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x = function ()
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{ return this }
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.call(x)
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`
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case flatMapRegex.MatchString(a):
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code := fold(strings.Split(a, "[]"))
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rs += fmt.Sprintf(
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`
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x = (
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%v
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)(x)
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`, code)
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case strings.HasPrefix(a, ".["):
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rs += fmt.Sprintf(
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`
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x = function ()
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{ return this%v }
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.call(x)
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`, a[1:])
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case strings.HasPrefix(a, "."):
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rs += fmt.Sprintf(
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`
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x = function ()
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{ return this%v }
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.call(x)
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`, a)
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default:
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rs += fmt.Sprintf(
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`
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let f = function ()
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{ return %v }
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.call(x)
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x = typeof f === 'function' ? f(x) : f
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`, a)
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}
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rs += `
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x = await x
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`
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// Generate a beautiful error message.
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rs += " } catch (e) {\n"
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pre, post, pointer := trace(args, i)
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rs += fmt.Sprintf(
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" throw `\\n ${%q} ${%q} ${%q}\\n %v\\n\\n${e.stack || e}`\n",
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pre, a, post, pointer,
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)
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rs += " }\n"
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}
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fxrc := ""
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home, err := os.UserHomeDir()
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if err == nil {
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b, err := os.ReadFile(path.Join(home, ".fxrc.js"))
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if err == nil {
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fxrc = "\n" + string(b)
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}
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}
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return fmt.Sprintf(templateJs, fxrc, rs)
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}
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