84 lines
2.0 KiB
Go
84 lines
2.0 KiB
Go
package sprig
|
|
|
|
import (
|
|
"encoding/json"
|
|
"reflect"
|
|
)
|
|
|
|
// dfault checks whether `given` is set, and returns default if not set.
|
|
//
|
|
// This returns `d` if `given` appears not to be set, and `given` otherwise.
|
|
//
|
|
// For numeric types 0 is unset.
|
|
// For strings, maps, arrays, and slices, len() = 0 is considered unset.
|
|
// For bool, false is unset.
|
|
// Structs are never considered unset.
|
|
//
|
|
// For everything else, including pointers, a nil value is unset.
|
|
func dfault(d interface{}, given ...interface{}) interface{} {
|
|
|
|
if empty(given) || empty(given[0]) {
|
|
return d
|
|
}
|
|
return given[0]
|
|
}
|
|
|
|
// empty returns true if the given value has the zero value for its type.
|
|
func empty(given interface{}) bool {
|
|
g := reflect.ValueOf(given)
|
|
if !g.IsValid() {
|
|
return true
|
|
}
|
|
|
|
// Basically adapted from text/template.isTrue
|
|
switch g.Kind() {
|
|
default:
|
|
return g.IsNil()
|
|
case reflect.Array, reflect.Slice, reflect.Map, reflect.String:
|
|
return g.Len() == 0
|
|
case reflect.Bool:
|
|
return g.Bool() == false
|
|
case reflect.Complex64, reflect.Complex128:
|
|
return g.Complex() == 0
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
return g.Int() == 0
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
return g.Uint() == 0
|
|
case reflect.Float32, reflect.Float64:
|
|
return g.Float() == 0
|
|
case reflect.Struct:
|
|
return false
|
|
}
|
|
}
|
|
|
|
// coalesce returns the first non-empty value.
|
|
func coalesce(v ...interface{}) interface{} {
|
|
for _, val := range v {
|
|
if !empty(val) {
|
|
return val
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// toJson encodes an item into a JSON string
|
|
func toJson(v interface{}) string {
|
|
output, _ := json.Marshal(v)
|
|
return string(output)
|
|
}
|
|
|
|
// toPrettyJson encodes an item into a pretty (indented) JSON string
|
|
func toPrettyJson(v interface{}) string {
|
|
output, _ := json.MarshalIndent(v, "", " ")
|
|
return string(output)
|
|
}
|
|
|
|
// ternary returns the first value if the last value is true, otherwise returns the second value.
|
|
func ternary(vt interface{}, vf interface{}, v bool) interface{} {
|
|
if v {
|
|
return vt
|
|
}
|
|
|
|
return vf
|
|
}
|