Initial version - NilOrPanicX.

LICENSE

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+Copyright (c) 2022 Patrick Smith
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

go.mod

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+module github.com/pat42smith/goerrors
+
+go 1.18
+
+require github.com/pat42smith/gotest v0.0.1 // indirect

go.sum

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+github.com/pat42smith/gotest v0.0.1 h1:NaeFsxxbfcZiFkLy8ywx89W9RWKldYW71mln4TOzCzw=
+github.com/pat42smith/gotest v0.0.1/go.mod h1:0q1IE4xoC2Nm07gIOXefKF73yrAWBjq90d6RS67dEF8=

goerrors.go

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+// Copyright 2022 Patrick Smith
+// Use of this source code is subject to the MIT-style license in the LICENSE file.
+
+// Package goerrors provides a few simple functions for handling errors in Go.
+package goerrors
+
+// NilOrPanic panics with e if e is not nil.
+func NilOrPanic(e error) {
+ if e != nil {
+ panic(e)
+ }
+}
+
+// NilOrPanic1 panics with e if e is not nil. Otherwise, it returns t.
+func NilOrPanic1[T any](t T, e error) T {
+ if e != nil {
+ panic(e)
+ }
+ return t
+}
+
+// NilOrPanic2 panics with e if e is not nil. Otherwise, it returns (t1, t2).
+func NilOrPanic2[T1, T2 any](t1 T1, t2 T2, e error) (T1, T2) {
+ if e != nil {
+ panic(e)
+ }
+ return t1, t2
+}

goerrors_test.go

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+// Copyright 2022 Patrick Smith
+// Use of this source code is subject to the MIT-style license in the LICENSE file.
+
+package goerrors
+
+import (
+ "fmt"
+ "testing"
+
+ "github.com/pat42smith/gotest"
+)
+
+func TestNilOrPanic(t *testing.T) {
+ NilOrPanic(nil)
+
+ e := gotest.MustPanic(t, func() {
+ NilOrPanic(fmt.Errorf("oops!"))
+ })
+ gotest.Expect(t, "oops!", e.(error).Error())
+}
+
+func TestNilOrPanic1(t *testing.T) {
+ var x byte = 99
+ gotest.Expect(t, x, NilOrPanic1(x, nil))
+
+ e := gotest.MustPanic(t, func() {
+ NilOrPanic1(x, fmt.Errorf("broken"))
+ })
+ gotest.Expect(t, "broken", e.(error).Error())
+
+ foo := func() (byte, error) {
+ return x, nil
+ }
+ gotest.Expect(t, x, NilOrPanic1(foo()))
+}
+
+func TestNilOrPanic2(t *testing.T) {
+ x := "seventeen"
+ y := 3.7
+ u, v := NilOrPanic2(x, y, nil)
+ gotest.Expect(t, x, u)
+ gotest.Expect(t, y, v)
+
+ e := gotest.MustPanic(t, func() {
+ NilOrPanic2(x, y, fmt.Errorf("sabotaged"))
+ })
+ gotest.Expect(t, "sabotaged", e.(error).Error())
+
+ foo := func() (string, float64, error) {
+ return x, y, nil
+ }
+ u, v = NilOrPanic2(foo())
+ gotest.Expect(t, x, u)
+ gotest.Expect(t, y, v)
+}