1 files changed, 176 insertions, 0 deletions
diff --git a/golang.go b/golang.go
new file mode 100644
index 0000000..a037ca2
--- /dev/null
+++ b/golang.go
@@ -0,0 +1,176 @@
+package debugger
+
+import (
+	"fmt"
+	"bytes"
+	// "os"
+	"runtime"
+	"runtime/debug"
+	"runtime/pprof"
+
+	"go.wit.com/log"
+	"go.wit.com/gui/gui"
+	"go.wit.com/gui/gadgets"
+)
+
+func DebugGolangWindow(p *gui.Node) *gadgets.BasicWindow {
+	var w *gadgets.BasicWindow
+	var g, og, outputTextbox *gui.Node
+
+	w = gadgets.NewBasicWindow(p, "GO")
+	g = w.Box().NewGroup("Language Internals").Pad()
+
+	g.NewButton("ReadModuleInfo()", func () {
+		tmp, _ := debug.ReadBuildInfo()
+		outputTextbox.SetText(tmp.String())
+	})
+	g.NewButton("runtime.NumGoroutine()", func () {
+		buf := new(bytes.Buffer)
+		pprof.Lookup("goroutine").WriteTo(buf, 1)
+		outputTextbox.SetText(buf.String())
+
+		outputTextbox.AppendText(fmt.Sprintln("runtime.NumGoroutine() = ", runtime.NumGoroutine()))
+	})
+	g.NewButton("pprof.Lookup(heap)", func () {
+		buf := new(bytes.Buffer)
+		pprof.Lookup("heap").WriteTo(buf, 1)
+		outputTextbox.SetText(buf.String())
+	})
+	g.NewButton("debug.PrintStack(current)", func () {
+		outputTextbox.SetText(string(debug.Stack()))
+	})
+	g.NewButton("pprof.Lookup(goroutine)", func () {
+		buf := new(bytes.Buffer)
+		pprof.Lookup("goroutine").WriteTo(buf, 1)
+		outputTextbox.SetText(buf.String())
+	})
+	g.NewButton("pprof.Lookup(block)", func () {
+		buf := new(bytes.Buffer)
+		pprof.Lookup("block").WriteTo(buf, 1)
+		outputTextbox.SetText(buf.String())
+	})
+	g.NewButton("pprof.Lookup threadcreate", func () {
+		buf := new(bytes.Buffer)
+		pprof.Lookup("threadcreate").WriteTo(buf, 1)
+		outputTextbox.SetText(buf.String())
+	})
+
+	g.NewButton("runtime.ReadMemStats()", func () {
+		outputTextbox.SetText(runtimeReadMemStats())
+	})
+
+	g.NewButton("debug.FreeOSMemory()", func () {
+		var out string = "Before debug.FreeOSMemory():\n\n"
+		out += runtimeReadMemStats()
+		debug.FreeOSMemory()
+		out += "\n\nAfter debug.FreeOSMemory():\n\n"
+		out += runtimeReadMemStats()
+		outputTextbox.SetText(out)
+	})
+
+	g.NewButton("debug.ReadGCStats()", func () {
+		var tmp debug.GCStats
+		var out string
+		debug.ReadGCStats(&tmp)
+		log.Log(true, tmp)
+		out += fmt.Sprintln("LastGC:", tmp.LastGC, "// time.Time time of last collection")
+		out += fmt.Sprintln("NumGC:", tmp.NumGC, "// number of garbage collections")
+		out += fmt.Sprintln("PauseTotal:", tmp.PauseTotal, "// total pause for all collections")
+		out += fmt.Sprintln("Pause:", tmp.Pause, "// []time.Duration pause history, most recent first")
+		out += fmt.Sprintln("PauseEnd:", tmp.Pause, "// []time.Time pause history, most recent first")
+		out += fmt.Sprintln("PauseQuantiles:", tmp.PauseQuantiles, "// []time.Duration")
+		outputTextbox.SetText(out)
+	})
+
+	g.NewButton("debug.SetTraceback('all')", func () {
+		debug.SetTraceback("all")
+	})
+
+	g.NewButton("panic()", func () {
+		panic("test")
+	})
+
+	g = w.Box().NewGroup("TODO: finish these").Pad()
+
+	// g.NewLabel("TODO:")
+
+	g.NewButton("runtime.Stack(true)", func () {
+		// TODO: https://stackoverflow.com/questions/61127053/how-to-list-all-the-running-goroutines-in-a-go-program
+		// func Stack(buf []byte, all bool) int
+	})
+
+	g.NewButton("debug.SetMemoryLimit(int)", func () {
+		// TODO:
+		//debug.SetMemoryLimit(1024 * 1024 * 100)
+	})
+
+	g.NewButton("debug.SetMaxStack(int bytes)", func () {
+		// default is apparently 1GB
+	})
+
+	g.NewButton("debug.SetMaxThreads(int)", func () {
+		// default is apparently 10,000
+	})
+
+	g.NewButton("debug.SetTraceback('all')", func () {
+		debug.SetTraceback("all")
+	})
+
+	// deprecated (probably) by String() implementation within golang
+	g.NewButton("dumpModuleInfo() (deprecate)", func () {
+		outputTextbox.SetText(dumpModuleInfo())
+	})
+
+	og = w.Box().NewGroup("output").Pad()
+	outputTextbox = og.NewTextbox("outputBox")
+	outputTextbox.Custom = func () {
+		log.Log(true, "custom TextBox() for golang output a =", outputTextbox.S)
+	}
+
+	return w
+}
+
+func runtimeReadMemStats() string {
+	var s runtime.MemStats
+	var out string
+	runtime.ReadMemStats(&s)
+	out += fmt.Sprintln("alloc:", s.Alloc, "bytes")
+	out += fmt.Sprintln("total-alloc:", s.TotalAlloc, "bytes")
+	out += fmt.Sprintln("sys:", s.Sys, "bytes")
+	out += fmt.Sprintln("lookups:", s.Lookups)
+	out += fmt.Sprintln("mallocs:", s.Mallocs)
+	out += fmt.Sprintln("frees:", s.Frees)
+	out += fmt.Sprintln("heap-alloc:", s.HeapAlloc, "bytes")
+	out += fmt.Sprintln("heap-sys:", s.HeapSys, "bytes")
+	out += fmt.Sprintln("heap-idle:", s.HeapIdle,"bytes")
+	out += fmt.Sprintln("heap-in-use:", s.HeapInuse, "bytes")
+	out += fmt.Sprintln("heap-released:", s.HeapReleased, "bytes")
+	out += fmt.Sprintln("heap-objects:", s.HeapObjects)
+	out += fmt.Sprintln("stack-in-use:", s.StackInuse, "bytes")
+	out += fmt.Sprintln("stack-sys", s.StackSys, "bytes")
+	out += fmt.Sprintln("next-gc: when heap-alloc >=", s.NextGC, "bytes")
+	out += fmt.Sprintln("last-gc:", s.LastGC, "ns")
+	out += fmt.Sprintln("gc-pause:", s.PauseTotalNs, "ns")
+	out += fmt.Sprintln("num-gc:", s.NumGC)
+	out += fmt.Sprintln("enable-gc:", s.EnableGC)
+	out += fmt.Sprintln("debug-gc:", s.DebugGC)
+	return out
+}
+
+func dumpModuleInfo() string {
+	var out string
+	tmp, _ := debug.ReadBuildInfo()
+	if tmp == nil {
+		out += fmt.Sprintln("This wasn't compiled with go module support")
+		return ""
+	}
+	out += fmt.Sprintln("mod.Path         = ", tmp.Path)
+	out += fmt.Sprintln("mod.Main.Path    = ", tmp.Main.Path)
+	out += fmt.Sprintln("mod.Main.Version = ", tmp.Main.Version)
+	out += fmt.Sprintln("mod.Main.Sum     = ", tmp.Main.Sum)
+	for _, value := range tmp.Deps {
+		out += fmt.Sprintln("\tmod.Path    = ", value.Path)
+		out += fmt.Sprintln("\tmod.Version = ", value.Version)
+	}
+	return out
+}