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
5package cmd
6
7import (
8	"context"
9	"flag"
10	"fmt"
11
12	"golang.org/x/tools/internal/span"
13	errors "golang.org/x/xerrors"
14)
15
16// check implements the check verb for gopls.
17type check struct {
18	app *Application
19}
20
21func (c *check) Name() string      { return "check" }
22func (c *check) Usage() string     { return "<filename>" }
23func (c *check) ShortHelp() string { return "show diagnostic results for the specified file" }
24func (c *check) DetailedHelp(f *flag.FlagSet) {
25	fmt.Fprint(f.Output(), `
26Example: show the diagnostic results of this file:
27
28  $ gopls check internal/lsp/cmd/check.go
29`)
30	f.PrintDefaults()
31}
32
33// Run performs the check on the files specified by args and prints the
34// results to stdout.
35func (c *check) Run(ctx context.Context, args ...string) error {
36	if len(args) == 0 {
37		// no files, so no results
38		return nil
39	}
40	checking := map[span.URI]*cmdFile{}
41	var uris []span.URI
42	// now we ready to kick things off
43	conn, err := c.app.connect(ctx)
44	if err != nil {
45		return err
46	}
47	defer conn.terminate(ctx)
48	for _, arg := range args {
49		uri := span.URIFromPath(arg)
50		uris = append(uris, uri)
51		file := conn.AddFile(ctx, uri)
52		if file.err != nil {
53			return file.err
54		}
55		checking[uri] = file
56	}
57	if err := conn.diagnoseFiles(ctx, uris); err != nil {
58		return err
59	}
60	conn.Client.filesMu.Lock()
61	defer conn.Client.filesMu.Unlock()
62
63	for _, file := range checking {
64		for _, d := range file.diagnostics {
65			spn, err := file.mapper.RangeSpan(d.Range)
66			if err != nil {
67				return errors.Errorf("Could not convert position %v for %q", d.Range, d.Message)
68			}
69			fmt.Printf("%v: %v\n", spn, d.Message)
70		}
71	}
72	return nil
73}
74