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x/tools/gopls: improve completions with mutli-return value functions #36540

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muirdm opened this issue Jan 14, 2020 · 3 comments
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x/tools/gopls: improve completions with mutli-return value functions #36540

muirdm opened this issue Jan 14, 2020 · 3 comments
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Tools gopls
Milestone
gopls completion

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@muirdm
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@muirdm muirdm commented Jan 14, 2020

We should make completion handle functions that return multiple values. For example:

// uprank functions that return two values
f, err := <>

var f *os.File
var err error

// uprank functions that return (*os.File, error)
f, err = <>

myFunc := func(int, bool) {}

// uprank functions that return (int, bool)
myFunc(<>)

All cases need to continue offering the existing scalar completions.
@gopherbot gopherbot added this to the Unreleased milestone Jan 14, 2020
@gopherbot gopherbot added the Tools label Jan 14, 2020
@gopherbot
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@gopherbot gopherbot commented Jan 14, 2020

Thank you for filing a gopls issue! Please take a look at the Troubleshooting guide, and make sure that you have provided all of the relevant information here.
@gopherbot gopherbot added the gopls label Jan 14, 2020
@stamblerre stamblerre modified the milestones: Unreleased, gopls unplanned Jan 14, 2020
@gopherbot
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@gopherbot gopherbot commented Jan 21, 2020

Change https://golang.org/cl/215538 mentions this issue: internal/lsp/source: handle completing into variadic params
@gopherbot
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@gopherbot gopherbot commented Jan 21, 2020

Change https://golang.org/cl/215537 mentions this issue: internal/lsp/source: improve completion involving multiple return values
@stamblerre stamblerre modified the milestones: gopls unplanned, gopls completion Jan 29, 2020
gopherbot pushed a commit to golang/tools that referenced this issue Feb 6, 2020
@muirdm @stamblerre
internal/lsp/source: improve completion involving multiple return values
50d6186 
For example:

// Prefer functions that return one or two values. Previously
// we had no preference.
foo, bar := <>

// Prefer functions that return "(int)" or "(int, ??)". Previously we
// only preferred the former.
var foo int
foo, bar := <>

// Prefer functions that return "(int)" or "(int, int)". Previously we
// only preferred the former.
var foo func(int, int)
foo(<>)

In the above example, we don't handle "foo" being variadic yet.

I also took the liberty to break up matchingCandidate() into separate
functions since it was getting rather long.

Updates golang/go#36540.

Change-Id: I9140dd989dfde1ddcfcd9d2a14198045c02587f2
Reviewed-on: https://go-review.googlesource.com/c/tools/+/215537
Run-TryBot: Muir Manders <muir@mnd.rs>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
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@stamblerre @gopherbot @muirdm