github.com/jhump/golang-x-tools@v0.0.0-20220218190644-4958d6d39439/internal/lsp/cmd/folding_range.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  
    12  	"github.com/jhump/golang-x-tools/internal/lsp/protocol"
    13  	"github.com/jhump/golang-x-tools/internal/span"
    14  	"github.com/jhump/golang-x-tools/internal/tool"
    15  )
    16  
    17  // foldingRanges implements the folding_ranges verb for gopls
    18  type foldingRanges struct {
    19  	app *Application
    20  }
    21  
    22  func (r *foldingRanges) Name() string      { return "folding_ranges" }
    23  func (r *foldingRanges) Parent() string    { return r.app.Name() }
    24  func (r *foldingRanges) Usage() string     { return "<file>" }
    25  func (r *foldingRanges) ShortHelp() string { return "display selected file's folding ranges" }
    26  func (r *foldingRanges) DetailedHelp(f *flag.FlagSet) {
    27  	fmt.Fprint(f.Output(), `
    28  Example:
    29  
    30  	$ gopls folding_ranges helper/helper.go
    31  `)
    32  	printFlagDefaults(f)
    33  }
    34  
    35  func (r *foldingRanges) Run(ctx context.Context, args ...string) error {
    36  	if len(args) != 1 {
    37  		return tool.CommandLineErrorf("folding_ranges expects 1 argument (file)")
    38  	}
    39  
    40  	conn, err := r.app.connect(ctx)
    41  	if err != nil {
    42  		return err
    43  	}
    44  	defer conn.terminate(ctx)
    45  
    46  	from := span.Parse(args[0])
    47  	file := conn.AddFile(ctx, from.URI())
    48  	if file.err != nil {
    49  		return file.err
    50  	}
    51  
    52  	p := protocol.FoldingRangeParams{
    53  		TextDocument: protocol.TextDocumentIdentifier{
    54  			URI: protocol.URIFromSpanURI(from.URI()),
    55  		},
    56  	}
    57  
    58  	ranges, err := conn.FoldingRange(ctx, &p)
    59  	if err != nil {
    60  		return err
    61  	}
    62  
    63  	for _, r := range ranges {
    64  		fmt.Printf("%v:%v-%v:%v\n",
    65  			r.StartLine+1,
    66  			r.StartCharacter+1,
    67  			r.EndLine+1,
    68  			r.EndCharacter,
    69  		)
    70  	}
    71  
    72  	return nil
    73  }