2023-12-15 17:27:47 +00:00
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package configmigrate
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2023-09-04 18:45:50 +01:00
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2023-09-06 11:43:29 +01:00
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import (
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"fmt"
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)
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2023-09-04 18:45:50 +01:00
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type (
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// yarr is the convenience alias for YAML array.
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yarr = []any
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// yobj is the convenience alias for YAML key-value object.
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yobj = map[string]any
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)
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// fieldVal returns the value of type T for key from obj. Use [any] if the
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// field's type doesn't matter.
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func fieldVal[T any](obj yobj, key string) (v T, ok bool, err error) {
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val, ok := obj[key]
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if !ok {
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return v, false, nil
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}
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if val == nil {
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return v, true, nil
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}
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v, ok = val.(T)
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if !ok {
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return v, false, fmt.Errorf("unexpected type of %q: %T", key, val)
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}
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return v, true, nil
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}
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// moveVal copies the value for srcKey from src into dst for dstKey and deletes
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// it from src.
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func moveVal[T any](src, dst yobj, srcKey, dstKey string) (err error) {
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newVal, ok, err := fieldVal[T](src, srcKey)
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if !ok {
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return err
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}
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dst[dstKey] = newVal
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delete(src, srcKey)
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return nil
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}
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// moveSameVal moves the value for key from src into dst.
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func moveSameVal[T any](src, dst yobj, key string) (err error) {
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return moveVal[T](src, dst, key, key)
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}
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// coalesceError returns the first non-nil error. It is named after function
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// COALESCE in SQL. If all errors are nil, it returns nil.
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//
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// TODO(e.burkov): Replace with [errors.Join].
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//
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// TODO(a.garipov): Think of ways to merge with [aghalg.Coalesce].
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func coalesceError(errors ...error) (res error) {
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for _, err := range errors {
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if err != nil {
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return err
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}
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}
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return nil
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}
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