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= err113 image:https://godoc.org/github.com/Djarvur/go-err113?status.svg["GoDoc",link="http://godoc.org/github.com/Djarvur/go-err113"] image:https://travis-ci.org/Djarvur/go-err113.svg["Build Status",link="https://travis-ci.org/Djarvur/go-err113"] image:https://coveralls.io/repos/Djarvur/go-err113/badge.svg?branch=master&service=github["Coverage Status",link="https://coveralls.io/github/Djarvur/go-err113?branch=master"]
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Daniel Podolsky
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:toc:
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Golang linter to check the errors handling expressions
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== Details
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Starting from Go 1.13 the standard `error` type behaviour was changed: one `error` could be derived from another with `fmt.Errorf()` method using `%w` format specifier.
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So the errors hierarchy could be built for flexible and responsible errors processing.
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And to make this possible at least two simple rules should be followed:
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1. `error` values should not be compared directly but with `errors.Is()` method.
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1. `error` should not be created dynamically from scratch but by the wrapping the static (package-level) error.
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This linter is checking the code for these 2 rules compliance.
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=== Reports
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So, `err113` reports every `==` and `!=` comparison for exact `error` type variables except comparison to `nil` and `io.EOF`.
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Also, any call of `errors.New()` and `fmt.Errorf()` methods are reported except the calls used to initialise package-level variables and the `fmt.Errorf()` calls wrapping the other errors.
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Note: non-standard packages, like `github.com/pkg/errors` are ignored completely.
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== Install
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```
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go get -u github.com/Djarvur/go-err113/cmd/err113
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```
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== Usage
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Defined by link:https://pkg.go.dev/golang.org/x/tools/go/analysis/singlechecker[singlechecker] package.
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```
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err113: checks the error handling rules according to the Go 1.13 new error type
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Usage: err113 [-flag] [package]
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Flags:
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-V print version and exit
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-all
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no effect (deprecated)
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-c int
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display offending line with this many lines of context (default -1)
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-cpuprofile string
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write CPU profile to this file
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-debug string
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debug flags, any subset of "fpstv"
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-fix
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apply all suggested fixes
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-flags
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print analyzer flags in JSON
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-json
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emit JSON output
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-memprofile string
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write memory profile to this file
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-source
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no effect (deprecated)
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-tags string
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no effect (deprecated)
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-trace string
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write trace log to this file
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-v no effect (deprecated)
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```
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== Thanks
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To link:https://github.com/quasilyte[Iskander (Alex) Sharipov] for the really useful advices.
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To link:https://github.com/jackwhelpton[Jack Whelpton] for the bugfix provided. |