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package flag
import (
"os"
"regexp"
"strconv"
"strings"
"time"
"github.com/kr/text"
)
// maxLineLength is the maximum width of any line.
const maxLineLength int = 78
// reRemoveWhitespace is a regular expression for stripping whitespace from
// a string.
var reRemoveWhitespace = regexp.MustCompile(`[\s]+`)
// FlagExample is an interface which declares an example value. This is
// used in help generation to provide better help text.
type FlagExample interface {
Example() string
}
// FlagVisibility is an interface which declares whether a flag should be
// hidden from help and completions. This is usually used for deprecations
// on "internal-only" flags.
type FlagVisibility interface {
Hidden() bool
}
// helpers
func envDefault(key, def string) string {
if v, exist := os.LookupEnv(key); exist {
return v
}
return def
}
func envBoolDefault(key string, def bool) bool {
if v, exist := os.LookupEnv(key); exist {
b, err := strconv.ParseBool(v)
if err != nil {
panic(err)
}
return b
}
return def
}
func envDurationDefault(key string, def time.Duration) time.Duration {
if v, exist := os.LookupEnv(key); exist {
d, err := time.ParseDuration(v)
if err != nil {
panic(err)
}
return d
}
return def
}
// wrapAtLengthWithPadding wraps the given text at the maxLineLength, taking
// into account any provided left padding.
func wrapAtLengthWithPadding(s string, pad int) string {
wrapped := text.Wrap(s, maxLineLength-pad)
lines := strings.Split(wrapped, "\n")
for i, line := range lines {
lines[i] = strings.Repeat(" ", pad) + line
}
return strings.Join(lines, "\n")
}
|
