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errcheck is a program for checking for unchecked errors in go programs.
go get github.com/kisielk/errcheck
errcheck requires Go 1.4 and depends on the go/types package from the golang.org/x/tools repository.
For basic usage, just give the package path of interest as the first argument:
errcheck github.com/kisielk/errcheck/testdata
There are currently five flags: -ignore, -ignorepkg, -tags, -asserts, and -blank
The -ignore flag takes a comma-separated list of pairs of the form package:regex.
For each package, the regex describes which functions to ignore within that package.
The package may be omitted to have the regex apply to all packages.
For example, you may wish to ignore common operations like Read and Write:
errcheck -ignore '[rR]ead|[wW]rite' path/to/package
or you may wish to ignore common functions like the print variants in fmt:
errcheck -ignore 'fmt:[FS]?[Pp]rint*' path/to/package
The -ignorepkg flag takes a comma-separated list of package import paths
to ignore:
errcheck -ignorepkg 'fmt,encoding/binary' path/to/package
Note that this is equivalent to:
errcheck -ignore 'fmt:.*,encoding/binary:.*' path/to/package
If a regex is provided for a package pkg via -ignore, and pkg also appears
in the list of packages passed to -ignorepkg, the latter takes precedence;
that is, all functions within pkg will be ignored.
Note that by default the fmt package is ignored entirely, unless a regex is
specified for it. To disable this, specify a regex that matches nothing:
errcheck -ignore 'fmt:a^' path/to/package
The -tags flag takes a space-separated list of build tags, just like go build. If you are using any custom build tags in your code base, you may need
to specify the relevant tags here.
The -asserts flag enabled checking for ignored type assertion results. It
takes no arguments.
The -blank flag enables checking for assignments of errors to the
blank identifier. It takes no arguments.
An example of using errcheck to check the go standard library packages:
errcheck -ignore 'Close|[wW]rite.*|Flush|Seek|[rR]ead.*' std > stdlibcheck
Or check all packages in your $GOPATH and $GOROOT:
errcheck all > allcheck
To check all packages beneath the current directory:
errcheck ./...
Currently errcheck is unable to check packages that import "C" due to limitations
in the importer.
However, you can use errcheck on packages that depend on those which use cgo. In
order for this to work you need to go install the cgo dependencies before running
errcheck on the dependant packages.
See kisielk#16 for more details.
errcheck returns 1 if any problems were found in the checked files. It returns 2 if there were any other failures.
go-errcheck.el
integrates errcheck with Emacs by providing a go-errcheck command
and customizable variables to automatically pass flags to errcheck.
go-errcheck-vim integrates errcheck with Vim's quickfix.