Plumb the new log-viewing widget into termshark's UI

Note that this is unix-only - there is no gowid terminal widget support
on Windows :-/

You can open the termshark log from the minibuffer by using the logs
command.

ui/logsui.go

@@ -0,0 +1,59 @@
+// Copyright 2019-2020 Graham Clark. All rights reserved.  Use of this source
+// code is governed by the MIT license that can be found in the LICENSE
+// file.
+
+// +build !windows
+
+// Package ui contains user-interface functions and helpers for termshark.
+package ui
+
+import (
+	"fmt"
+
+	"github.com/gcla/gowid"
+	"github.com/gcla/gowid/widgets/holder"
+	"github.com/gcla/gowid/widgets/terminal"
+	"github.com/gcla/termshark/v2/widgets/logviewer"
+)
+
+//======================================================================
+
+// Dynamically load conv. If the convs window was last opened with a different filter, and the "limit to
+// filter" checkbox is checked, then the data needs to be reloaded.
+func openLogsUi(app gowid.IApp) {
+	logsUi, err := logviewer.New(gowid.WidgetCallback{"cb",
+		func(app gowid.IApp, w gowid.IWidget) {
+			t := w.(*terminal.Widget)
+			ecode := t.Cmd.ProcessState.ExitCode()
+			// -1 for signals - don't show an error for that
+			if ecode != 0 && ecode != -1 {
+				d := OpenError(fmt.Sprintf(
+					"Could not run logs viewer\n\n%s", t.Cmd.ProcessState), app)
+				d.OnOpenClose(gowid.MakeWidgetCallback("cb", func(app gowid.IApp, w gowid.IWidget) {
+					closeLogsUi(app)
+				}))
+			} else {
+				closeLogsUi(app)
+			}
+		},
+	},
+	)
+	if err != nil {
+		OpenError(fmt.Sprintf("Error launching terminal: %v", err), app)
+		return
+	}
+
+	logsView := holder.New(logsUi)
+
+	appViewNoKeys.SetSubWidget(logsView, app)
+}
+
+func closeLogsUi(app gowid.IApp) {
+	appViewNoKeys.SetSubWidget(mainView, app)
+}
+
+//======================================================================
+// Local Variables:
+// mode: Go
+// fill-column: 110
+// End:

ui/logsui_windows.go

@@ -0,0 +1,26 @@
+// Copyright 2019-2020 Graham Clark. All rights reserved.  Use of this source
+// code is governed by the MIT license that can be found in the LICENSE
+// file.
+
+// Package ui contains user-interface functions and helpers for termshark.
+package ui
+
+import (
+	"github.com/gcla/gowid"
+)
+
+// Dynamically load conv. If the convs window was last opened with a different filter, and the "limit to
+// filter" checkbox is checked, then the data needs to be reloaded.
+func openLogsUi(app gowid.IApp) {
+}
+
+func closeLogsUi(app gowid.IApp) {
+}
+
+//======================================================================
+
+//======================================================================
+// Local Variables:
+// mode: Go
+// fill-column: 110
+// End:

ui/ui.go

@@ -1000,6 +1000,15 @@ func lastLineMode(app gowid.IApp) {
 		return nil
 	}))
 
+	if runtime.GOOS != "windows" {
+		MiniBuffer.Register("logs", minibufferFn(func(gowid.IApp, ...string) error {
+			app.Run(gowid.RunFunction(func(app gowid.IApp) {
+				openLogsUi(app)
+			}))
+			return nil
+		}))
+	}
+
 	MiniBuffer.Register("set", setCommand{})
 
 	// read new pcap
@@ -2393,7 +2402,9 @@ func Build() (*gowid.App, error) {
 
 	//======================================================================
 
-	generalMenuItems := []menuutil.SimpleMenuItem{
+	generalMenuItems := make([]menuutil.SimpleMenuItem, 0)
+
+	generalMenuItems = append(generalMenuItems, []menuutil.SimpleMenuItem{
 		menuutil.SimpleMenuItem{
 			Txt: "Refresh Screen",
 			Key: gowid.MakeKeyExt2(0, tcell.KeyCtrlL, ' '),
@@ -2420,7 +2431,20 @@ func Build() (*gowid.App, error) {
 				generalMenu.Close(app)
 				reallyClear(app)
 			},
-		},
+		}}...)
+
+	if runtime.GOOS != "windows" {
+		generalMenuItems = append(generalMenuItems, menuutil.SimpleMenuItem{
+			Txt: "Show Log",
+			Key: gowid.MakeKey('l'),
+			CB: func(app gowid.IApp, w gowid.IWidget) {
+				analysisMenu.Close(app)
+				openLogsUi(app)
+			},
+		})
+	}
+
+	generalMenuItems = append(generalMenuItems, []menuutil.SimpleMenuItem{
 		menuutil.MakeMenuDivider(),
 		menuutil.SimpleMenuItem{
 			Txt: "Help",
@@ -2484,7 +2508,7 @@ func Build() (*gowid.App, error) {
 				reallyQuit(app)
 			},
 		},
-	}
+	}...)
 
 	if PacketColorsSupported {
 		generalMenuItems = append(