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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package mod
import (
"context"
"fmt"
"os"
"path/filepath"
"golang.org/x/mod/modfile"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/lsp/source"
"golang.org/x/tools/internal/span"
)
// LensFuncs returns the supported lensFuncs for go.mod files.
func LensFuncs() map[string]source.LensFunc {
return map[string]source.LensFunc{
source.CommandUpgradeDependency.Name: upgradeLenses,
source.CommandTidy.Name: tidyLens,
source.CommandVendor.Name: vendorLens,
}
}
func upgradeLenses(ctx context.Context, snapshot source.Snapshot, fh source.FileHandle) ([]protocol.CodeLens, error) {
pm, err := snapshot.ParseMod(ctx, fh)
if err != nil || pm.File == nil {
return nil, err
}
if len(pm.File.Require) == 0 {
// Nothing to upgrade.
return nil, nil
}
upgradeTransitiveArgs, err := source.MarshalArgs(fh.URI(), false, []string{"-u", "all"})
if err != nil {
return nil, err
}
var requires []string
for _, req := range pm.File.Require {
requires = append(requires, req.Mod.Path)
}
upgradeDirectArgs, err := source.MarshalArgs(fh.URI(), false, requires)
if err != nil {
return nil, err
}
// Put the upgrade code lenses above the first require block or statement.
rng, err := firstRequireRange(fh, pm)
if err != nil {
return nil, err
}
return []protocol.CodeLens{
{
Range: rng,
Command: protocol.Command{
Title: "Upgrade transitive dependencies",
Command: source.CommandUpgradeDependency.ID(),
Arguments: upgradeTransitiveArgs,
},
},
{
Range: rng,
Command: protocol.Command{
Title: "Upgrade direct dependencies",
Command: source.CommandUpgradeDependency.ID(),
Arguments: upgradeDirectArgs,
},
},
}, nil
}
func tidyLens(ctx context.Context, snapshot source.Snapshot, fh source.FileHandle) ([]protocol.CodeLens, error) {
pm, err := snapshot.ParseMod(ctx, fh)
if err != nil || pm.File == nil {
return nil, err
}
if len(pm.File.Require) == 0 {
// Nothing to vendor.
return nil, nil
}
goModArgs, err := source.MarshalArgs(fh.URI())
if err != nil {
return nil, err
}
rng, err := moduleStmtRange(fh, pm)
if err != nil {
return nil, err
}
return []protocol.CodeLens{{
Range: rng,
Command: protocol.Command{
Title: source.CommandTidy.Title,
Command: source.CommandTidy.ID(),
Arguments: goModArgs,
},
}}, nil
}
func vendorLens(ctx context.Context, snapshot source.Snapshot, fh source.FileHandle) ([]protocol.CodeLens, error) {
pm, err := snapshot.ParseMod(ctx, fh)
if err != nil || pm.File == nil {
return nil, err
}
rng, err := moduleStmtRange(fh, pm)
if err != nil {
return nil, err
}
goModArgs, err := source.MarshalArgs(fh.URI())
if err != nil {
return nil, err
}
// Change the message depending on whether or not the module already has a
// vendor directory.
title := "Create vendor directory"
vendorDir := filepath.Join(filepath.Dir(fh.URI().Filename()), "vendor")
if info, _ := os.Stat(vendorDir); info != nil && info.IsDir() {
title = "Sync vendor directory"
}
return []protocol.CodeLens{{
Range: rng,
Command: protocol.Command{
Title: title,
Command: source.CommandVendor.ID(),
Arguments: goModArgs,
},
}}, nil
}
func moduleStmtRange(fh source.FileHandle, pm *source.ParsedModule) (protocol.Range, error) {
if pm.File == nil || pm.File.Module == nil || pm.File.Module.Syntax == nil {
return protocol.Range{}, fmt.Errorf("no module statement in %s", fh.URI())
}
syntax := pm.File.Module.Syntax
return lineToRange(pm.Mapper, fh.URI(), syntax.Start, syntax.End)
}
// firstRequireRange returns the range for the first "require" in the given
// go.mod file. This is either a require block or an individual require line.
func firstRequireRange(fh source.FileHandle, pm *source.ParsedModule) (protocol.Range, error) {
if len(pm.File.Require) == 0 {
return protocol.Range{}, fmt.Errorf("no requires in the file %s", fh.URI())
}
var start, end modfile.Position
for _, stmt := range pm.File.Syntax.Stmt {
if b, ok := stmt.(*modfile.LineBlock); ok && len(b.Token) == 1 && b.Token[0] == "require" {
start, end = b.Span()
break
}
}
firstRequire := pm.File.Require[0].Syntax
if start.Byte == 0 || firstRequire.Start.Byte < start.Byte {
start, end = firstRequire.Start, firstRequire.End
}
return lineToRange(pm.Mapper, fh.URI(), start, end)
}
func lineToRange(m *protocol.ColumnMapper, uri span.URI, start, end modfile.Position) (protocol.Range, error) {
line, col, err := m.Converter.ToPosition(start.Byte)
if err != nil {
return protocol.Range{}, err
}
s := span.NewPoint(line, col, start.Byte)
line, col, err = m.Converter.ToPosition(end.Byte)
if err != nil {
return protocol.Range{}, err
}
e := span.NewPoint(line, col, end.Byte)
return m.Range(span.New(uri, s, e))
}
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