kevinschoon-pomo/vendor/github.com/jawher/mow.cli/utils.go

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2018-01-21 11:41:29 +01:00
package cli
import (
"flag"
"os"
"strings"
)
func setFromEnv(into flag.Value, envVars string) bool {
multiValued, isMulti := into.(multiValued)
if len(envVars) > 0 {
for _, rev := range strings.Split(envVars, " ") {
ev := strings.TrimSpace(rev)
if len(ev) == 0 {
continue
}
v := os.Getenv(ev)
if len(v) == 0 {
continue
}
if !isMulti {
if err := into.Set(v); err == nil {
return true
}
continue
}
vs := strings.Split(v, ",")
if err := setMultivalued(multiValued, vs); err == nil {
return true
}
}
}
return false
}
func setMultivalued(into multiValued, values []string) error {
into.Clear()
for _, v := range values {
v = strings.TrimSpace(v)
if err := into.Set(v); err != nil {
into.Clear()
return err
}
}
return nil
}
func joinStrings(parts ...string) string {
res := ""
for _, part := range parts {
s := strings.TrimSpace(part)
if s == "" {
continue
}
if res != "" {
res += " "
}
res += part
}
return res
}