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feat: add untypedconst linter #3527

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@leonklingele leonklingele commented Jan 31, 2023
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The untypedconst linter ensures that untyped constant expressions are not used as values of defined (= named) types.

// The first call is valid as it is passing a typed-constant to "takesExString" which expects a typed-constant as its first parameter.
// The second call is invalid as it passes an untyped-constant which has the same underlying type as the one expected (string)
func Call() {
	takesExString(external.ExStr)
	takesExString("hoge") // want `passing untyped constant to parameter of defined type "github.com/jiftechnify/untypedconst/pkg/external.ExString"`
[..]

https://github.com/jiftechnify/untypedconst

Fixes #3478

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@ldez ldez added enhancement New feature or improvement linter: new Support new linter labels Feb 1, 2023
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ldez commented Feb 1, 2023
edited by alexandear
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In order for a pull request adding a linter to be reviewed, the linter and the PR must follow some requirements.

Pull Request Description

  • It must have a link to the linter repository.
  • It must provide a short description of the linter.

Linter

  • It must not be a duplicate of another linter or a rule of a linter. (the team will help to verify that)
  • It must have a valid license (AGPL is not allowed) and the file must contain the required information by the license, ex: author, year, etc.
  • The linter repository must have a CI and tests.
  • It must use go/analysis.
  • It must have a valid tag, ex: v1.0.0, v0.1.0.
  • It must not contain init().
  • It must not contain panic(), log.fatal(), os.exit(), or similar.
  • It must not have false positives/negatives. (the team will help to verify that)
  • It must have tests inside golangci-lint.

The Linter Tests Inside Golangci-lint

  • They must have at least one std lib import.
  • They must work with T=<name of the linter test file>.go make test_linters. (the team will help to verify that)

.golangci.reference.yml

  • The linter must be added to the list of available linters (alphabetical case-insensitive order).
    • enable and disable options
  • If the linter has a configuration, the exhaustive configuration of the linter must be added (alphabetical case-insensitive order)
    • The values must be different from the default ones.
    • The default values must be defined in a comment.
    • The option must have a short description.

Others Requirements

  • The files (tests and linter) inside golangci-lint must have the same name as the linter.
  • The .golangci.yml of golangci-lint itself must not be edited and the linter must not be added to this file.
  • The linters must be sorted in the alphabetical order (case-insensitive) in the Manager.GetAllSupportedLinterConfigs(...) and .golangci.reference.yml.
  • The load mode (WithLoadMode(...)):
    • if the linter doesn't use types: goanalysis.LoadModeSyntax
    • goanalysis.LoadModeTypesInfo required WithLoadForGoAnalysis() in the Manager.GetAllSupportedLinterConfigs(...)
  • The version in WithSince(...) must be the next minor version (v1.X.0) of golangci-lint.

Recommendations

  • The linter should not use SSA. (currently, SSA does not support generics)
  • The linter repository should have a readme and linting.
  • The linter should be published as a binary. (useful to diagnose bug origins)

The golangci-lint team will edit this comment to check the boxes before and during the review.

This checklist does not imply that we will accept the linter.

@ldez ldez added the waiting for: contributor feedback Requires additional feedback label Feb 1, 2023
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Is there anything I can do to get this reviewed? Friendly ping towards @ldez :)

@golangci golangci deleted a comment from Antonboom Oct 1, 2023
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I really think this is a great addition to the project. I use the linter on quite a few projects already and it has proven to be super helpful. Is there anything I could do to get this merged?

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@leonklingele could you please resolve conflicts and update the PR according to the #3527 (comment)?

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Updated, ptal.

Upstream has made some changes to comply with our requirements since: jiftechnify/untypedconst#1 (comment) 🥳

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@leonklingele could you address the point regarding "The Linter Tests Inside Golangci-lint: They must have at least one std lib import"?

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leonklingele commented Mar 23, 2024
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Done 😊

EDIT: CI is failing, apparently: analysis.go:189: untypedconst.go:5:2: unexpected diagnostic: could not import fmt (Config.Importer.Import(fmt) returned nil but no error) What does that mean?

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Updated this for the latest v1.64.0 release. Please have another look at it. I'd love to see this being a part of the project! 😃

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@ldez is there anything missing here to have this reviewed? Thank you! 😃

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CLA assistant check
Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
You have signed the CLA already but the status is still pending? Let us recheck it.

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Add "untypedconst" linter

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