This is the command gofmt that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
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.
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:
Print comments; if false, all comments are elided from the output.
Indent with tabs; if false, spaces are used instead.
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
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