s0rg/crawley

package values

import (
    "bufio"
    "bytes"
    "fmt"
    "io/fs"
)

const fileMarker = '@' // curl-compatible

type Smart struct {
    values []string
}

func (s *Smart) Set(val string) (err error) {
    s.values = append(s.values, val)

    return
}

func (s *Smart) Load(
    target fs.FS,
) (rv []string, err error) {
    rv = make([]string, 0, len(s.values))

    var vals []string

    for _, v := range s.values {
        if v[0] == fileMarker {
            if vals, err = loadFile(target, v[1:]); err != nil {
                return
            }

            rv = append(rv, vals...)
        } else {
            rv = append(rv, v)
        }
    }

    return
}

func (s *Smart) String() (rv string) {
    return
}

func loadFile(
    target fs.FS,
    name string,
) (rv []string, err error) {
    var body []byte

    if body, err = fs.ReadFile(target, name); err != nil {
        err = fmt.Errorf("read: %w", err)

        return
    }

    sc := bufio.NewScanner(bytes.NewReader(body))

    for sc.Scan() {
        rv = append(rv, sc.Text())
    }

    return rv, nil
}