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# Description
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Please also include relevant motivation and context. -->
Prompted by a comment in another review:
https://github.com/pulumi/pulumi/pull/14654#discussion_r1419995945
This lints that we don't use `fmt.Errorf` when `errors.New` will
suffice, it also covers a load of other cases where `Sprintf` is
sub-optimal.
Most of these edits were made by running `perfsprint --fix`.
## Checklist
- [x] I have run `make tidy` to update any new dependencies
- [x] I have run `make lint` to verify my code passes the lint check
- [x] I have formatted my code using `gofumpt`
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unchecked. -->
- [ ] I have added tests that prove my fix is effective or that my
feature works
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User-facing changes require a CHANGELOG entry.
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- [ ] I have run `make changelog` and committed the
`changelog/pending/<file>` documenting my change
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Fixes https://github.com/pulumi/pulumi/issues/12738https://github.com/pulumi/pulumi/pull/11834 turned on the prealloc
linter and changed a load of slice uses from just `var x T[]` to `x :=
make([]T, 0, preallocSize)`. This was good for performance but it turns
out there are a number of places in the codebase that treat a `nil`
slice as semnatically different to an empty slice.
Trying to test that, or even reason that through for every callsite is
untractable, so this PR replaces all expressions of the form `make([]T,
0, size)` with a call to `slice.Prealloc[T](size)`. When size is 0 that
returns a nil array, rather than an empty array.
Migrates all remaining usages of
`contract.Assert*` and `contract.Require*` to the f variants,
which require adding meaningful error messages.
There were a couple cases where a `testing.T` or `testing.B`
was already available.
For those, this uses t.FailNow or require.NoError.
Refs #12132
Per team discussion, switching to gofumpt.
[gofumpt][1] is an alternative, stricter alternative to gofmt.
It addresses other stylistic concerns that gofmt doesn't yet cover.
[1]: https://github.com/mvdan/gofumpt
See the full list of [Added rules][2], but it includes:
- Dropping empty lines around function bodies
- Dropping unnecessary variable grouping when there's only one variable
- Ensuring an empty line between multi-line functions
- simplification (`-s` in gofmt) is always enabled
- Ensuring multi-line function signatures end with
`) {` on a separate line.
[2]: https://github.com/mvdan/gofumpt#Added-rules
gofumpt is stricter, but there's no lock-in.
All gofumpt output is valid gofmt output,
so if we decide we don't like it, it's easy to switch back
without any code changes.
gofumpt support is built into the tooling we use for development
so this won't change development workflows.
- golangci-lint includes a gofumpt check (enabled in this PR)
- gopls, the LSP for Go, includes a gofumpt option
(see [installation instrutions][3])
[3]: https://github.com/mvdan/gofumpt#installation
This change was generated by running:
```bash
gofumpt -w $(rg --files -g '*.go' | rg -v testdata | rg -v compilation_error)
```
The following files were manually tweaked afterwards:
- pkg/cmd/pulumi/stack_change_secrets_provider.go:
one of the lines overflowed and had comments in an inconvenient place
- pkg/cmd/pulumi/destroy.go:
`var x T = y` where `T` wasn't necessary
- pkg/cmd/pulumi/policy_new.go:
long line because of error message
- pkg/backend/snapshot_test.go:
long line trying to assign three variables in the same assignment
I have included mention of gofumpt in the CONTRIBUTING.md.
Go treats comments that match the following regex as directives.
//[a-z0-9]+:[a-z0-9]
Comments that are directives don't show in an entity's documentation.
5a550b6951 (diff-f56160fd9fcea272966a8a1d692ad9f49206fdd8dbcbfe384865a98cd9bc2749R165)
Our code has `//nolint` directives that now show in the API Reference.
This is because these directives are in one of the following forms,
which don't get this special treatment.
// nolint:foo
//nolint: foo
This change fixes all such directives found by the regex:
`// nolint|//nolint: `.
See bottom of commit for command used for the fix.
Verification:
Here's the output of `go doc` on some entities
before and after this change.
Before
```
% go doc github.com/pulumi/pulumi/sdk/v3/go/pulumi | head -n8
package pulumi // import "github.com/pulumi/pulumi/sdk/v3/go/pulumi"
nolint: lll, interfacer
nolint: lll, interfacer
const EnvOrganization = "PULUMI_ORGANIZATION" ...
var ErrPlugins = errors.New("pulumi: plugins requested")
```
After
```
% go doc github.com/pulumi/pulumi/sdk/v3/go/pulumi | head -n8
package pulumi // import "github.com/pulumi/pulumi/sdk/v3/go/pulumi"
const EnvOrganization = "PULUMI_ORGANIZATION" ...
var ErrPlugins = errors.New("pulumi: plugins requested")
func BoolRef(v bool) *bool
func Float64Ref(v float64) *float64
func IntRef(v int) *int
func IsSecret(o Output) bool
```
Before
```
% go doc github.com/pulumi/pulumi/sdk/v3/go/pulumi URN_
package pulumi // import "github.com/pulumi/pulumi/sdk/v3/go/pulumi"
func URN_(o string) ResourceOption
URN_ is an optional URN of a previously-registered resource of this type to
read from the engine. nolint: revive
```
After:
```
% go doc github.com/pulumi/pulumi/sdk/v3/go/pulumi URN_
package pulumi // import "github.com/pulumi/pulumi/sdk/v3/go/pulumi"
func URN_(o string) ResourceOption
URN_ is an optional URN of a previously-registered resource of this type to
read from the engine.
```
Note that golangci-lint offers a 'nolintlint' linter
that finds such miuses of nolint,
but it also finds other issues so I've deferred that to a follow up PR.
Resolves#11785
Related: https://github.com/golangci/golangci-lint/issues/892
[git-generate]
FILES=$(mktemp)
rg -l '// nolint|//nolint: ' |
tee "$FILES" |
xargs perl -p -i -e '
s|// nolint|//nolint|g;
s|//nolint: |//nolint:|g;
'
rg '.go$' < "$FILES" | xargs gofmt -w -s
* Do not share maps so tests can run in parallel
* Fix comment
* Try not to break dependencies
* Address PR feedback
* Fix downstream compilation failure
* Fix lint
* Address PR feedback