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package gui
// This is based off of the excellent example and documentation here:
// https://github.com/vladimirvivien/go-plugin-example
// There truly are great people in this world.
// It's a pleasure to be here with all of you
import (
"log"
"os"
"plugin"
"github.com/davecgh/go-spew/spew"
)
// TODO: could a protobuf work here?
type Greeter interface {
Greet()
JcarrButton()
AddButton(string)
}
var PlugGocli *plugin.Plugin
var PlugGocliOk bool
var PlugHello *plugin.Plugin
// var gBut plugin.Symbol
var jcarrBut plugin.Symbol
var symGreeter plugin.Symbol
var greeter Greeter
var ok bool
var typeToolkit plugin.Symbol
var typeToolkitCast Greeter
func LoadPlugin(name string) *plugin.Plugin {
scs := spew.ConfigState{MaxDepth: 1}
// load module
// 1. open the so file to load the symbols
plug, err := plugin.Open(name)
log.Println("plug =")
log.Println(scs.Sdump(plug))
if err != nil {
log.Println(err)
return nil
}
// 2. look up a symbol (an exported function or variable)
// in this case, variable Greeter
typeToolkit, err = plug.Lookup("Toolkit")
log.Println("plugin.Toolkit", typeToolkit)
log.Println(scs.Sdump(typeToolkit))
if err != nil {
log.Println(err)
os.Exit(1)
}
symGreeter, err = plug.Lookup("Greeter")
log.Println("symGreater", symGreeter)
log.Println(scs.Sdump(symGreeter))
if err != nil {
log.Println(err)
os.Exit(1)
}
// 3. Assert that loaded symbol is of a desired type
// in this case interface type Greeter (defined above)
// var greeter Greeter
greeter, ok = symGreeter.(Greeter)
log.Println("greeter", symGreeter)
log.Println(scs.Sdump(greeter))
if !ok {
log.Println("unexpected type from module symbol")
os.Exit(1)
}
/*
typeToolkitCast, ok = typeToolkit.(Greeter)
if !ok {
log.Println("unexpected cast of Toolkit to Greeter")
os.Exit(1)
}
*/
return plug
}
func RunGreet() {
log.Println("gui.RunGreet() START")
if (greeter == nil) {
log.Println("wit/gui gocui plugin didn't load")
return
}
PlugGocliOk = true
greeter.Greet()
}
func LookupJcarrButton() {
log.Println("lookupJcarrButton() START")
if (greeter == nil) {
log.Println("wit/gui gocui plugin didn't load")
return
}
greeter.JcarrButton()
}
func GocuiAddButton(name string) {
log.Println("GocuiAddButton() START", name)
if (greeter == nil) {
log.Println("wit/gui gocui plugin didn't load")
return
}
greeter.AddButton(name)
}
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