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// Package env contains functions that retrieve data from the environment
package env
import (
"io/fs"
"os"
"strings"
osfs "github.com/hack-pad/hackpadfs/os"
"github.com/hairyhenderson/gomplate/v4/internal/datafs"
)
// Getenv - retrieves the value of the environment variable named by the key.
// If the variable is unset, but the same variable ending in `_FILE` is set, the
// referenced file will be read into the value.
// Otherwise the provided default (or an emptry string) is returned.
func Getenv(key string, def ...string) string {
fsys := datafs.WrapWdFS(osfs.NewFS())
return getenvVFS(fsys, key, def...)
}
// ExpandEnv - like os.ExpandEnv, except supports `_FILE` vars as well
func ExpandEnv(s string) string {
fsys := datafs.WrapWdFS(osfs.NewFS())
return expandEnvVFS(fsys, s)
}
// expandEnvVFS -
func expandEnvVFS(fsys fs.FS, s string) string {
return os.Expand(s, func(s string) string {
return getenvVFS(fsys, s)
})
}
// getenvVFS - a convenience function intended for internal use only!
func getenvVFS(fsys fs.FS, key string, def ...string) string {
val := getenvFile(fsys, key)
if val == "" && len(def) > 0 {
return def[0]
}
return val
}
func getenvFile(fsys fs.FS, key string) string {
val := os.Getenv(key)
if val != "" {
return val
}
p := os.Getenv(key + "_FILE")
if p != "" {
val, err := readFile(fsys, p)
if err != nil {
return ""
}
return strings.TrimSpace(val)
}
return ""
}
func readFile(fsys fs.FS, p string) (string, error) {
b, err := fs.ReadFile(fsys, p)
if err != nil {
return "", err
}
return string(b), nil
}
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