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internal/lsp/source: don't get unnecessary unimported completions

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Unimported completions are always low-priority. If the user already
has 100 completion options, the unimported ones are probably not useful.
There's no point in calculating any of them.

Also, only do unimported completions for package members when they're
enabled. Oops.

Change-Id: I7535a22ad56bed869dceb6cd0ffdfc6390cf8eb5
Reviewed-on: https://go-review.googlesource.com/c/tools/+/212629
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
This commit is contained in:
Heschi Kreinick 2019-12-23 13:19:17 -05:00
parent 234df48a20
commit fd66c7521c
1 changed files with 5 additions and 7 deletions
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12
internal/lsp/source/completion.go
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@ -601,7 +601,7 @@ func (c *completer) wantTypeName() bool {
}
// See https://golang.org/issue/36001. Unimported completions are expensive.
const maxUnimported = 20
const unimportedTarget = 100
// selector finds completions for the specified selector expression.
func (c *completer) selector(sel *ast.SelectorExpr) error {
@ -620,15 +620,14 @@ func (c *completer) selector(sel *ast.SelectorExpr) error {
}
// Try unimported packages.
if id, ok := sel.X.(*ast.Ident); ok {
if id, ok := sel.X.(*ast.Ident); ok && c.opts.Unimported && len(c.items) < unimportedTarget {
pkgExports, err := PackageExports(c.ctx, c.snapshot.View(), id.Name, c.filename)
if err != nil {
return err
}
known := c.snapshot.KnownImportPaths()
startingItems := len(c.items)
for _, pkgExport := range pkgExports {
if len(c.items)-startingItems >= maxUnimported {
if len(c.items) >= unimportedTarget {
break
}
// If we've seen this import path, use the fully-typed version.
@ -828,7 +827,7 @@ func (c *completer) lexical() error {
}
}
if c.opts.Unimported {
if c.opts.Unimported && len(c.items) < unimportedTarget {
// Suggest packages that have not been imported yet.
pkgs, err := CandidateImports(c.ctx, c.snapshot.View(), c.filename)
if err != nil {
@ -838,9 +837,8 @@ func (c *completer) lexical() error {
// Rank unimported packages significantly lower than other results.
score *= 0.07
startingItems := len(c.items)
for _, pkg := range pkgs {
if len(c.items)-startingItems >= maxUnimported {
if len(c.items) >= unimportedTarget {
break
}
if _, ok := seen[pkg.IdentName]; !ok {