GOFMT(1)						      General Commands Manual							  GOFMT(1)

NAME

       gofmt - formats Go programs

SYNOPSIS

       gofmt [flags] [ path ...  ]

DESCRIPTION

       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.

OPTIONS

       -d     Do not print reformatted sources to standard output.  If a file's formatting is different than gofmt's, print diffs to standard out-
	      put.

       -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 match-
       ing 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 'a[B:len(a)] -> a[B:]' -w $GOROOT/src/pkg

BUGS

       The implementation of -r is a bit slow.

AUTHOR

       This manual page was written by Michael Stapelberg <stapelberg@debian.org>, for the Debian project (and may be used by others).

								    2012-05-13								  GOFMT(1)