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package shell
import (
"errors"
"fmt"
"io/ioutil"
"path/filepath"
"unicode/utf8"
"github.com/elves/elvish/eval"
"github.com/elves/elvish/parse"
)
// script evaluates a script. The returned error contains enough context and can
// be printed as-is (with util.PprintError).
func script(ev *eval.Evaler, args []string, cmd, compileOnly bool) error {
arg0 := args[0]
ev.SetArgs(args[1:])
var name, path, code string
if cmd {
name = "code from -c"
path = ""
code = arg0
} else {
var err error
name = arg0
path, err = filepath.Abs(name)
if err != nil {
return fmt.Errorf("cannot get full path of script %q: %v", name, err)
}
code, err = readFileUTF8(path)
if err != nil {
return fmt.Errorf("cannot read script %q: %v", name, err)
}
}
n, err := parse.Parse(name, code)
if err != nil {
return err
}
src := eval.NewScriptSource(name, path, code)
op, err := ev.Compile(n, src)
if err != nil {
return err
}
if compileOnly {
return nil
}
return ev.EvalWithStdPorts(op, src)
}
var errSourceNotUTF8 = errors.New("source is not UTF-8")
func readFileUTF8(fname string) (string, error) {
bytes, err := ioutil.ReadFile(fname)
if err != nil {
return "", err
}
if !utf8.Valid(bytes) {
return "", errSourceNotUTF8
}
return string(bytes), nil
}
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