github.com/april1989/origin-go-tools@v0.0.32/internal/lsp/cmd/highlight.go (about)

     1  // Copyright 2019 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package cmd
     6  
     7  import (
     8  	"context"
     9  	"flag"
    10  	"fmt"
    11  	"sort"
    12  
    13  	"github.com/april1989/origin-go-tools/internal/lsp/protocol"
    14  	"github.com/april1989/origin-go-tools/internal/span"
    15  	"github.com/april1989/origin-go-tools/internal/tool"
    16  )
    17  
    18  // highlight implements the highlight verb for gopls.
    19  type highlight struct {
    20  	app *Application
    21  }
    22  
    23  func (r *highlight) Name() string      { return "highlight" }
    24  func (r *highlight) Usage() string     { return "<position>" }
    25  func (r *highlight) ShortHelp() string { return "display selected identifier's highlights" }
    26  func (r *highlight) DetailedHelp(f *flag.FlagSet) {
    27  	fmt.Fprint(f.Output(), `
    28  Example:
    29  
    30    $ # 1-indexed location (:line:column or :#offset) of the target identifier
    31    $ gopls highlight helper/helper.go:8:6
    32    $ gopls highlight helper/helper.go:#53
    33  
    34    gopls highlight flags are:
    35  `)
    36  	f.PrintDefaults()
    37  }
    38  
    39  func (r *highlight) Run(ctx context.Context, args ...string) error {
    40  	if len(args) != 1 {
    41  		return tool.CommandLineErrorf("highlight expects 1 argument (position)")
    42  	}
    43  
    44  	conn, err := r.app.connect(ctx)
    45  	if err != nil {
    46  		return err
    47  	}
    48  	defer conn.terminate(ctx)
    49  
    50  	from := span.Parse(args[0])
    51  	file := conn.AddFile(ctx, from.URI())
    52  	if file.err != nil {
    53  		return file.err
    54  	}
    55  
    56  	loc, err := file.mapper.Location(from)
    57  	if err != nil {
    58  		return err
    59  	}
    60  
    61  	p := protocol.DocumentHighlightParams{
    62  		TextDocumentPositionParams: protocol.TextDocumentPositionParams{
    63  			TextDocument: protocol.TextDocumentIdentifier{URI: loc.URI},
    64  			Position:     loc.Range.Start,
    65  		},
    66  	}
    67  	highlights, err := conn.DocumentHighlight(ctx, &p)
    68  	if err != nil {
    69  		return err
    70  	}
    71  
    72  	var results []span.Span
    73  	for _, h := range highlights {
    74  		l := protocol.Location{Range: h.Range}
    75  		s, err := file.mapper.Span(l)
    76  		if err != nil {
    77  			return err
    78  		}
    79  		results = append(results, s)
    80  	}
    81  	// Sort results to make tests deterministic since DocumentHighlight uses a map.
    82  	sort.SliceStable(results, func(i, j int) bool {
    83  		return span.Compare(results[i], results[j]) == -1
    84  	})
    85  
    86  	for _, s := range results {
    87  		fmt.Println(s)
    88  	}
    89  	return nil
    90  }