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https://github.com/bbrodriges/bundle

Bundle merges multiple Go source files into single one
https://github.com/bbrodriges/bundle

bundling golang source-code

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Bundle merges multiple Go source files into single one

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# bundle
Bundle merges multiple Go source files into single one.

# Install

```
go get -u github.com/bbrodriges/bundle
```

# Usage

As a separate command:

```
$ bundle --help
Usage: bundle -p [-d] pattern...
Available options:
-d Delete source files after bundling
-p string
Package name to be written into result file. Required

$ bundle -d -p main *_gen.go > bundle.go # bundle all autogenerated files in current folder
$ bundle -d -p main -o bundle.go user.msgp.go user.str.go # bundle only specific files
```

As a `go generate` flag:

```go
package types

//go:generate msgp -o=user.msgp.go -tests=false -io=false
//go:generate stringer -type=User -output=user.str.go -linecomment
//msgp:shim UserState as:string using:(UserState).String/UserStateFromString

//go:generate bundle -d -p=types -o=user_gen.go user.msgp.go user.str.go

type User struct {
Username string `msg:"username"`
Email string `msg:"email"`
State UserState `msg:"state"`
}

type UserState int

const (
Unknown UserState = iota -1 // UNKNOWN
Inactive // INACTIVE
Active // ACTIVE
Banned // BANNED
)

func UserStateFromString(s string) UserState {
switch s {
case "INACTIVE":
return Inactive
case "ACTIVE":
return Active
case "BANNED":
return Banned
}
return Unknown
}
```

The above code upon calling `go generate .` will:
1. create files called `user.msgp.go` and `user.str.go` with containing autogenerated code
2. bundle these two files into single `user_gen.go` and delete source files `user.msgp.go` and `user.str.go`

# Limitations

* bundle cannot handle definition conflicts (e.g. structs, functions, constants of the same names)
* bundle cannot handle import cycle conflicts

All it does is collects and strips out import declarations from every given source files AST and concats them into single file with helping comments.