From b410d0fd083ee89eed410cda2123a22cddcd3f44 Mon Sep 17 00:00:00 2001
From: Jeff Carr <jcarr@wit.com>
Date: Sun, 6 Nov 2022 19:57:20 -0600
Subject: Implement a early AddButton() via a golang plugin

    pass a name to gocui.AddButton()
    cleaner plugin usage
    add the start to golang plugin
    plugin stuff in a single file
    added a button correctly
    andlabs/ui added a button via plugin to gocli
  	  hot diggity!
    trying to invoke a gocli plugin function from the andlabs ui
    load the plugin
    hide more debugging output
    turn off all output

Signed-off-by: Jeff Carr <jcarr@wit.com>
---
 plugin.go | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 plugin.go

(limited to 'plugin.go')

diff --git a/plugin.go b/plugin.go
new file mode 100644
index 0000000..5c10e03
--- /dev/null
+++ b/plugin.go
@@ -0,0 +1,90 @@
+package gui
+
+import (
+	"log"
+	"os"
+
+	"plugin"
+	"github.com/davecgh/go-spew/spew"
+)
+
+type Greeter interface {
+	Greet()
+	JcarrButton()
+	AddButton(string)
+}
+
+var PlugGocli *plugin.Plugin
+var PlugHello *plugin.Plugin
+
+// var gBut plugin.Symbol
+var jcarrBut plugin.Symbol
+var symGreeter plugin.Symbol
+var greeter Greeter
+var ok bool
+
+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)
+		os.Exit(1)
+	}
+	PlugGocli = plug
+
+	// 2. look up a symbol (an exported function or variable)
+	// in this case, variable Greeter
+	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)
+	}
+	return plug
+}
+
+func RunGreet() {
+	log.Println("gui.RunGreet() START")
+	if (greeter == nil) {
+		log.Println("wit/gui gocui plugin didn't load")
+		return
+	}
+	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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