golang.org/x/tools/gopls@v0.15.3/internal/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  	"golang.org/x/tools/gopls/internal/protocol"
    13  	"golang.org/x/tools/internal/tool"
    14  )
    15  
    16  // foldingRanges implements the folding_ranges verb for gopls
    17  type foldingRanges struct {
    18  	app *Application
    19  }
    20  
    21  func (r *foldingRanges) Name() string      { return "folding_ranges" }
    22  func (r *foldingRanges) Parent() string    { return r.app.Name() }
    23  func (r *foldingRanges) Usage() string     { return "<file>" }
    24  func (r *foldingRanges) ShortHelp() string { return "display selected file's folding ranges" }
    25  func (r *foldingRanges) DetailedHelp(f *flag.FlagSet) {
    26  	fmt.Fprint(f.Output(), `
    27  Example:
    28  
    29  	$ gopls folding_ranges helper/helper.go
    30  `)
    31  	printFlagDefaults(f)
    32  }
    33  
    34  func (r *foldingRanges) Run(ctx context.Context, args ...string) error {
    35  	if len(args) != 1 {
    36  		return tool.CommandLineErrorf("folding_ranges expects 1 argument (file)")
    37  	}
    38  
    39  	conn, err := r.app.connect(ctx, nil)
    40  	if err != nil {
    41  		return err
    42  	}
    43  	defer conn.terminate(ctx)
    44  
    45  	from := parseSpan(args[0])
    46  	if _, err := conn.openFile(ctx, from.URI()); err != nil {
    47  		return err
    48  	}
    49  
    50  	p := protocol.FoldingRangeParams{
    51  		TextDocument: protocol.TextDocumentIdentifier{
    52  			URI: from.URI(),
    53  		},
    54  	}
    55  
    56  	ranges, err := conn.FoldingRange(ctx, &p)
    57  	if err != nil {
    58  		return err
    59  	}
    60  
    61  	for _, r := range ranges {
    62  		fmt.Printf("%v:%v-%v:%v\n",
    63  			r.StartLine+1,
    64  			r.StartCharacter+1,
    65  			r.EndLine+1,
    66  			r.EndCharacter+1,
    67  		)
    68  	}
    69  
    70  	return nil
    71  }