github.com/april1989/origin-go-tools@v0.0.32/internal/lsp/cmd/imports.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  	"io/ioutil"
    12  
    13  	"github.com/april1989/origin-go-tools/internal/lsp/diff"
    14  	"github.com/april1989/origin-go-tools/internal/lsp/protocol"
    15  	"github.com/april1989/origin-go-tools/internal/lsp/source"
    16  	"github.com/april1989/origin-go-tools/internal/span"
    17  	"github.com/april1989/origin-go-tools/internal/tool"
    18  	errors "golang.org/x/xerrors"
    19  )
    20  
    21  // imports implements the import verb for gopls.
    22  type imports struct {
    23  	Diff  bool `flag:"d" help:"display diffs instead of rewriting files"`
    24  	Write bool `flag:"w" help:"write result to (source) file instead of stdout"`
    25  
    26  	app *Application
    27  }
    28  
    29  func (t *imports) Name() string      { return "imports" }
    30  func (t *imports) Usage() string     { return "<filename>" }
    31  func (t *imports) ShortHelp() string { return "updates import statements" }
    32  func (t *imports) DetailedHelp(f *flag.FlagSet) {
    33  	fmt.Fprintf(f.Output(), `
    34  Example: update imports statements in a file:
    35  
    36    $ gopls imports -w internal/lsp/cmd/check.go
    37  
    38  gopls imports flags are:
    39  `)
    40  	f.PrintDefaults()
    41  }
    42  
    43  // Run performs diagnostic checks on the file specified and either;
    44  // - if -w is specified, updates the file in place;
    45  // - if -d is specified, prints out unified diffs of the changes; or
    46  // - otherwise, prints the new versions to stdout.
    47  func (t *imports) Run(ctx context.Context, args ...string) error {
    48  	if len(args) != 1 {
    49  		return tool.CommandLineErrorf("imports expects 1 argument")
    50  	}
    51  	conn, err := t.app.connect(ctx)
    52  	if err != nil {
    53  		return err
    54  	}
    55  	defer conn.terminate(ctx)
    56  
    57  	from := span.Parse(args[0])
    58  	uri := from.URI()
    59  	file := conn.AddFile(ctx, uri)
    60  	if file.err != nil {
    61  		return file.err
    62  	}
    63  	actions, err := conn.CodeAction(ctx, &protocol.CodeActionParams{
    64  		TextDocument: protocol.TextDocumentIdentifier{
    65  			URI: protocol.URIFromSpanURI(uri),
    66  		},
    67  	})
    68  	if err != nil {
    69  		return errors.Errorf("%v: %v", from, err)
    70  	}
    71  	var edits []protocol.TextEdit
    72  	for _, a := range actions {
    73  		if a.Title != "Organize Imports" {
    74  			continue
    75  		}
    76  		for _, c := range a.Edit.DocumentChanges {
    77  			if fileURI(c.TextDocument.URI) == uri {
    78  				edits = append(edits, c.Edits...)
    79  			}
    80  		}
    81  	}
    82  	sedits, err := source.FromProtocolEdits(file.mapper, edits)
    83  	if err != nil {
    84  		return errors.Errorf("%v: %v", edits, err)
    85  	}
    86  	newContent := diff.ApplyEdits(string(file.mapper.Content), sedits)
    87  
    88  	filename := file.uri.Filename()
    89  	switch {
    90  	case t.Write:
    91  		if len(edits) > 0 {
    92  			ioutil.WriteFile(filename, []byte(newContent), 0644)
    93  		}
    94  	case t.Diff:
    95  		diffs := diff.ToUnified(filename+".orig", filename, string(file.mapper.Content), sedits)
    96  		fmt.Print(diffs)
    97  	default:
    98  		fmt.Print(string(newContent))
    99  	}
   100  	return nil
   101  }