cleanup of the example commands. more plugin workv0.4.6

    add a button in two plugins at the same time!
        added a button in andlabs/ui & gocui
    attempt a common widget struct between wit/gui & the plugins
    start handling missing plugins
    rename Makefile command examples
    remote examples used for testing
    filename improvements
    golang src code uses lowercase and _ in filenames
    fix crash when button click function == nil
    fix wrong name 'gocli' -> 'gocui'
    keep fighting with goreadme generated README.md

Signed-off-by: Jeff Carr <[email protected]>

1 files changed, 28 insertions, 2 deletions

diff --git a/plugin.go b/plugin.go
index 5c10e03..58e6dbe 100644
--- a/plugin.go
+++ b/plugin.go
@@ -1,5 +1,10 @@
 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"
@@ -8,6 +13,7 @@ import (
 	"github.com/davecgh/go-spew/spew"
 )
 
+// TODO: could a protobuf work here?
 type Greeter interface {
 	Greet()
 	JcarrButton()
@@ -15,6 +21,7 @@ type Greeter interface {
 }
 
 var PlugGocli *plugin.Plugin
+var PlugGocliOk bool
 var PlugHello *plugin.Plugin
 
 // var gBut plugin.Symbol
@@ -23,6 +30,9 @@ 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}
 
@@ -33,12 +43,19 @@ func LoadPlugin(name string) *plugin.Plugin {
 	log.Println(scs.Sdump(plug))
 	if err != nil {
 		log.Println(err)
-		os.Exit(1)
+		return nil
 	}
-	PlugGocli = plug
 
 	// 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))
@@ -57,6 +74,14 @@ func LoadPlugin(name string) *plugin.Plugin {
 		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
 }
 
@@ -66,6 +91,7 @@ func RunGreet() {
 		log.Println("wit/gui gocui plugin didn't load")
 		return
 	}
+	PlugGocliOk = true
 	greeter.Greet()
 }