Provided by: golang-go_1.10~4ubuntu1_amd64
gofmt - formats Go programs
gofmt [flags] [ path ... ]
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.
-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.
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
The implementation of -r is a bit slow.
This manual page was written by Michael Stapelberg <firstname.lastname@example.org>, for the Debian project (and may be used by others). 2012-05-13 GOFMT(1)