#using Gtk

@Base.kwdef mutable struct Lines
	reminant::Union{String, Nothing} = nothing
	lines::Vector{String} = String[]
end

function Base.push!(ls::Lines, s::String)
	if ls.reminant != nothing
		s = ls.reminant * s
		ls.reminant = nothing
	end

	lines = split(s, '\n', keepempty=false)

	if s[end] == '\n'
		for l in lines
			push!(ls.lines, l)
		end
		return
	end

	ls.reminant = String(lines[end])
	for l in lines[1:end - 1]
		push!(ls.lines, l)
	end
end

function launch_process(running::Function, cmd::Cmd; start::Function=()->begin end, stop::Function=()->begin end)
	Threads.@spawn begin
		lines = Lines()
		buf = IOBuffer()
		process = run(pipeline(ignorestatus(cmd), stdout=buf), wait=false)
		start()
		while process_running(process)
			sleep(1)
			push!(lines, String(take!(buf)))
			if length(lines.lines) > 0
				running(lines.lines)
				empty!(lines.lines)
			end
		end
		stop()
	end
end

launch_process(`./a.out`; start=()->println("Start"), stop=()->println("Stop")) do strings
	for s in strings
		println("Running: $s")
	end
end
sleep(60)
#win = GtkWindow("Hello", 800, 600)
#
#function createMenuBar()
#	mb = GtkMenuBar()
#
#	# file menu
#	begin
#		fileMenu = GtkMenuItem("_File")
#		fileSub = GtkMenu(fileMenu)
#		push!(fileSub, GtkMenuItem("_New"))
#		push!(fileSub, GtkMenuItem("_Open"))
#		push!(fileSub, GtkSeparatorMenuItem())
#		fileExit = GtkMenuItem("E_xit")
#		signal_connect(fileExit, :activate) do widget
#			Gtk.destroy(win)
#		end
#		push!(fileSub, fileExit)
#		push!(mb, fileMenu)
#	end
#	return mb
#end
#
#
#vbox = GtkBox(:v)
#tv = GtkTextView()
#push!(vbox, createMenuBar())
#push!(vbox, GtkScrolledWindow(tv))
#push!(win, vbox)
#showall(win)
#
#if !isinteractive()
#	@async Gtk.gtk_main()
#	Gtk.waitforsignal(win, :destroy)
#end