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feat: add zero linter#3529

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leonklingele wants to merge1 commit intogolangci:master
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@leonklingele
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@leonklingeleleonklingele commentedJan 31, 2023
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Thezero linter finds unnecessary zero-value assignments when short-hand declaring & initializing a variable:

package avar_string=""// want "shoud not assign zero value"func_() {n:=0// want "shoud not assign zero value"_=nvar_ []int=nil// want "shoud not assign zero value"var_ []int= []int{}// OKm:=int32(0)// OK_=mvar_*int=nil// want "shoud not assign zero value"var_struct{}=struct{}{}// want "shoud not assign zero value"var_,_int// OKvar_,_int=0,1// want "shoud not assign zero value"var_,_int=1,2// OKvar_,_int=1-1,2-2// want "shoud not assign zero value" "shoud not assign zero value"var_bool=false// want "shoud not assign zero value"var_bool=true// OKtypeTstruct{Nint }var_T=T{}// want "shoud not assign zero value"}

https://github.com/gostaticanalysis/zero

Fixes#3491

@ldezldez added enhancementNew feature or improvement linter: newSupport new linter labelsFeb 1, 2023
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ldez commentedFeb 1, 2023
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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 usego/analysis.
  • It must have a valid tag, ex:v1.0.0,v0.1.0.
  • It must not containinit().
  • It must not containpanic(),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 withT=<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 anddisable 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 theManager.GetAllSupportedLinterConfigs(...) and.golangci.reference.yml.
  • The load mode (WithLoadMode(...)):
    • if the linter doesn't use types:goanalysis.LoadModeSyntax
    • goanalysis.LoadModeTypesInfo requiredWithLoadForGoAnalysis() in theManager.GetAllSupportedLinterConfigs(...)
  • The version inWithSince(...) 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.

@ldezldez added the waiting for: contributor feedbackRequires additional feedback labelFeb 1, 2023
//golangcitest:args -Ezero
package testdata

var _ string = "" // want "shoud not assign zero value"
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please fix the typo inshould

@Antonboom
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  1. Naming proposal – nozeroassign.zero is too general, is not it?
  2. Maybe better to make it part ofineffassign?
  3. Does it coverHow to check 'Declaring Empty Slices' #3248?

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

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@alexandearalexandearalexandear requested changes

+1 more reviewer

@spateconspateconspatecon approved these changes

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Add "zero" linter

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@leonklingele@ldez@Antonboom@ldemailly@CLAassistant@alexandear@spatecon

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