I have interface:

type IBusinessRuleContext interface {
    IRWLocker
    Value(interface{}) interface{}
}
type IRWLocker interface {
    sync.Locker
    RLock()
    RUnlock()
}

And when i create some object with type IBusinessRuleContext interfacer suggests: {MyType} can be sync.Locker

But sync.Locker is embedded to IRWLocker and it embedded to biggest interface IBusinessRuleContext.

I have been running interfacer with neomake whenever I save a golang file. This has been working fine, until I attempted to edit a _test.go file, where I recieved the following error:

$ interfacer smlr/http_test.go 
smlr/http_test.go:22:12: undeclared name: HTTPWaiter

(where HTTPWaiter is declared in `smlr/http.go). Many other tools handle this discrepancy well, I wonder if interfacer could.

Unfortunately, I can't tell you what version of interfacer this is:

$ interfacer --version
flag provided but not defined: -version
Usage of interfacer:
  -v    print the names of packages as they are checked

Here is my neomake configuration, if that helps:

let g:neomake_go_interfacer_maker = {
    \ 'errorformat': '%f:%l:%c: %m'
    \ }
let g:neomake_go_enabled_makers = ['go', 'golint', 'govet', 'interfacer']

Copied the example in readme.md nearly verbatim into here (senseless code but just attempting to evade any potential compiler-side code removal..) but interfacer github.com/metaleap/go-devgo works for some 1-3 secs but prints nothing, same with interfacer -v github.com/metaleap/go-devgo --- what am I missing?

It's good for debugging/reporting errors!

$ interfacer --version
flag provided but not defined: -version
Usage of interfacer:
  -v    print the names of packages as they are checked

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x0 pc=0x47db18]

goroutine 1 [running]:
github.com/mvdan/interfacer.orderedPkgs(0xc0820075c0, 0x0, 0x0, 0x0, 0x0, 0x0)
        c:/dev/godev/src/github.com/mvdan/interfacer/check.go:105 +0x328
github.com/mvdan/interfacer.CheckArgs(0xc0820046f0, 0x1, 0x1, 0xaa46f0, 0xc082022010, 0x404400, 0x0, 0x0)
        c:/dev/godev/src/github.com/mvdan/interfacer/check.go:123 +0x1c8
main.main()
        c:/dev/godev/src/github.com/mvdan/interfacer/cmd/interfacer/main.go:20 +0xab

I noticed that the vendor folder is included in the results from interfacer. The vendor folder is a little beyond my control and I don't think that interfacer should check the vendor folder.

For example, one of my projects vendors github.com/stretchr/testify and I see this error from interfacer:

interfacer ./...
vendor/github.com/stretchr/testify/mock/mock.go:276:36: t can be assert.TestingT

Running the tool on the follow code fails with the error:

$ interfacer ./...
p/a/t/h/main.go:185:3: unknown field Pdeathsig in struct literal

cmd := exec.Command("foo")
cmd.SysProcAttr = &syscall.SysProcAttr{
    Pdeathsig: syscall.SIGTERM,
}

In the repo readme:

This package relies on go/types for the heavy lifting: name resolution, constant folding and type inference. It also uses go/loader to resolve the packages specified by import paths.

I'd be curious to use the latter in other code, but I don't find any actual go/loader imports in your .go sources here and no mention of loader at https://golang.org/pkg/go/ either --- what is it?

This is a better default usage example. Most people want to run the tool on code they control, not vendored code that cannot be modified.

Updates #27. Fixes #29.

interfacer is a good tool for gophers. I have tried it and got many help. I have a small issue that is currently the interfacer tries to analyze the vendor folder in the golang repo. In my opinion, It is better for interfacer not to analyze vendor folder.

$interfacer ./...
/Users/tony/Test/GoToolsProjects/src/app-weixin/vendor/github.com/astaxie/beego/session/couchbase/sess_couchbase.go:40:12: could not import github.com/couchbase/go-couchbase (cannot find package "github.com/couchbase/go-couchbase" in any of:
	/Users/tony/Test/GoToolsProjects/src/app-weixin/vendor/github.com/couchbase/go-couchbase (vendor tree)
	/Users/tony/.bin/go17/src/github.com/couchbase/go-couchbase (from $GOROOT)
	/Users/tony/Test/GoToolsProjects/src/github.com/couchbase/go-couchbase (from $GOPATH))

When I run : go get -u github.com/mvdan/interfacer/cmd/interfacer I get:

../../mvdan/interfacer/check.go:19: inconsistent definition for type ssa.NamedConst during import struct { ssa.object *types.Const; Value *ssa.Const; ssa.pkg *ssa.Package } (in "golang.org/x/tools/go/ssa") struct { ssa.object *types.Const; Value *ssa.Const; ssa.pos token.Pos; ssa.pkg *ssa.Package } (in "github.com/mvdan/lint")

../../mvdan/interfacer/check.go:19: method redeclared: ssa.Program.CreateTestMainPackage method(*ssa.Program) func(*ssa.Package) *ssa.Package method(*ssa.Program) func(...*ssa.Package) *ssa.Package