dogsled is a Go static analysis tool to find assignments/declarations with too many blank identifiers (e.g. x, _, _, _ := f()). Its name was inspired from this reddit post.
go get -u github.com/alexkohler/dogsled/cmd/dogsled
Similar to other Go static analysis tools (such as golint, go vet), dogsled can be invoked with one or more filenames, directories, or packages named by its import path. dogsled also supports the ... wildcard. By default, it will search for assignment with more than two blank identifiers.
dogsled [flags] files/directories/packages
- -tests (default true) - Include test files in analysis
- -n (default 2) - Maximum number of blank identifiers allowed in an assignment statement
- -set_exit_status (default false) - Set exit status to 1 if any issues are found
Some examples from the Go standard library
$ dogsled go/src/...
go/src/crypto/elliptic/elliptic_test.go:553: declaration has 3 blank identifiers: priv, _, _, _ := GenerateKey(p256,go/src/image/names.go:46: declaration has 3 blank identifiers: _, _, _, a := c.C.RGBA()
go/src/image/color/color.go:232: declaration has 3 blank identifiers: _, _, _, a := c.RGBA()
go/src/image/color/color.go:240: declaration has 3 blank identifiers: _, _, _, a := c.RGBA()
go/src/internal/cpu/cpu_x86.go:67: declaration has 3 blank identifiers: maxID, _, _, _ := cpuid(0, 0)
go/src/internal/cpu/cpu_x86.go:100: declaration has 3 blank identifiers: _, ebx7, _, _ := cpuid(7, 0)
go/src/math/big/natconv_test.go:286: declaration has 3 blank identifiers: x, _, _, _ = x.scan(strings.NewReader(pi),go/src/reflect/value.go:172: declaration has 3 blank identifiers: pc, _, _, _ := runtime.Caller(2)
go/src/reflect/makefunc.go:62: declaration has 4 blank identifiers: _, _, _, stack, _ := funcLayout(t, nil)
go/src/reflect/makefunc.go:113: declaration has 4 blank identifiers: _, _, _, stack, _ := funcLayout(funcType, nil)
go/src/runtime/softfloat64.go:309: declaration has 4 blank identifiers: _, _, _, _ = fi, fn, gi, gn
go/src/runtime/symtab_test.go:54: declaration has 3 blank identifiers: _, _, line, _ := runtime.Caller(1)
go/src/syscall/syscall_unix_test.go:182: declaration has 3 blank identifiers: _, oobn, _, _, err := uc.ReadMsgUnixgo/src/time/time.go:498: declaration has 3 blank identifiers: year, _, _, _ := t.date(false)
go/src/time/time.go:504: declaration has 3 blank identifiers: _, month, _, _ := t.date(true)
go/src/time/time.go:510: declaration has 3 blank identifiers: _, _, day, _ := t.date(true)
go/src/time/time.go:624: declaration has 3 blank identifiers: _, _, _, yday := t.date(false)Please open an issue and/or a PR for any features/bugs.
If you've enjoyed dogsled, take a look at my other static anaylsis tools!