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grahamking/errs.go

Created May 22, 2020 17:09
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Revisions

  1. grahamking created this gist May 22, 2020.
    59 changes: 59 additions & 0 deletions errs.go
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,59 @@
    package util

    import (
    "errors"
    "strings"
    )

    // Errs is an error that collects other errors, for when you want to do
    // several things and then report all of them.
    type Errs struct {
    errors []error
    }

    func (e *Errs) Add(err error) {
    if err != nil {
    e.errors = append(e.errors, err)
    }
    }

    func (e *Errs) Ret() error {
    if e == nil || e.IsEmpty() {
    return nil
    }
    return e
    }

    func (e *Errs) IsEmpty() bool {
    return e.Len() == 0
    }

    func (e *Errs) Len() int {
    return len(e.errors)
    }

    func (e *Errs) Error() string {
    asStr := make([]string, len(e.errors))
    for i, x := range e.errors {
    asStr[i] = x.Error()
    }
    return strings.Join(asStr, ". ")
    }

    func (e *Errs) Is(target error) bool {
    for _, candidate := range e.errors {
    if errors.Is(candidate, target) {
    return true
    }
    }
    return false
    }

    func (e *Errs) As(target interface{}) bool {
    for _, candidate := range e.errors {
    if errors.As(candidate, target) {
    return true
    }
    }
    return false
    }