1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
Gofmt formats Go programs.
Without an explicit path, it processes the standard input. Given a file,
it operates on that file; given a directory, it operates on all .go files in
that directory, recursively. (Files starting with a period are ignored.)
By default, gofmt prints the reformatted sources to standard output.
Usage:
gofmt [flags] [path ...]
The flags are:
-d
Do not print reformatted sources to standard output.
If a file's formatting is different than gofmt's, print diffs
to standard output.
-e
Print all (including spurious) errors.
-l
Do not print reformatted sources to standard output.
If a file's formatting is different from gofmt's, print its name
to standard output.
-r rule
Apply the rewrite rule to the source before reformatting.
-s
Try to simplify code (after applying the rewrite rule, if any).
-w
Do not print reformatted sources to standard output.
If a file's formatting is different from gofmt's, overwrite it
with gofmt's version.
Formatting control flags:
-comments=true
Print comments; if false, all comments are elided from the output.
-tabs=true
Indent with tabs; if false, spaces are used instead.
-tabwidth=8
Tab width in spaces.
The rewrite rule specified with the -r flag must be a string of the form:
pattern -> replacement
Both pattern and replacement must be valid Go expressions.
In the pattern, single-character lowercase identifiers serve as
wildcards matching arbitrary sub-expressions; those expressions
will be substituted for the same identifiers in the replacement.
When gofmt reads from standard input, it accepts either a full Go program
or a program fragment. A program fragment must be a syntactically
valid declaration list, statement list, or expression. When formatting
such a fragment, gofmt preserves leading indentation as well as leading
and trailing spaces, so that individual sections of a Go program can be
formatted by piping them through gofmt.
Examples
To check files for unnecessary parentheses:
gofmt -r '(a) -> a' -l *.go
To remove the parentheses:
gofmt -r '(a) -> a' -w *.go
To convert the package tree from explicit slice upper bounds to implicit ones:
gofmt -r 'α[β:len(α)] -> α[β:]' -w $GOROOT/src/pkg
*/
package main
// BUG(rsc): The implementation of -r is a bit slow.
|
