Add support for SuggestedFixes

[ldez]

Is your feature request related to a problem? Please describe.

Add support for SuggestedFixes.

https://github.com/golang/tools/blob/b4639ccb830b1c9602f1c96eba624bbbe20650ea/go/analysis/doc/suggested_fixes.md

Describe the solution you'd like

Be able to apply automatically the fixes via --fix.

Describe alternatives you've considered

Display the suggestion as extra information.

Additional context

type Diagnostic struct {
	// ...

	// SuggestedFixes contains suggested fixes for a diagnostic which can be used to perform
	// edits to a file that address the diagnostic.
	// TODO(matloob): Should multiple SuggestedFixes be allowed for a diagnostic?
	// Diagnostics should not contain SuggestedFixes that overlap.
	// Experimental: This API is experimental and may change in the future.
	SuggestedFixes []SuggestedFix // optional


	// ...
}

https://github.com/golang/tools/blob/b4639ccb830b1c9602f1c96eba624bbbe20650ea/go/analysis/diagnostic.go#L23-L28

Current linters that support SuggestedFixes:

• goerr113
• ruleguard
• staticcheck
• nlreturn
• exportloopref
• exhaustive
• govet

Related to #1728

If you want to help me:

• https://donate.golangci.org
• https://donate.ldez.dev

Latest update: #1779 (comment)

[ldez]

I'm working on and for now, I'm able to apply suggestions from goerr113 because the suggestions concern only one line.

For the other, the problem is a bit more complex because the fix must be applied on multiple lines.

[SVilgelm]

I think we need to print the suggested fixes if they are not applied (without --fix)

[ldez]

In some cases, it will be very weird to display the suggestions, because a suggestion can be a \n or the removal of a line, and TextEdits is a slice.

[SVilgelm]

agree

[SVilgelm]

we can print a diff, anyway you are going to create a diff, so we can print replacement, maybe in verbose output

[SVilgelm]

@ldez
I think we need to replace the Replacement with SuggestedFixes in golangci-lint, to avoid a transformation.

[ldez]

I think we can support both as the first step, but I'm thinking about it, I need more time.

[SVilgelm]

Here is the code of how to apply SuggestedFixes: https://github.com/golang/tools/blob/54dc8c5edb561003330ec7e649333181bbd0a9bd/go/analysis/internal/checker/checker.go#L316