用gtk ruby写的简易irb
本帖最后由 africwildman 于 2015-6-24 00:27 编辑就是调用eval执行表达式，参考了一下gnumeric里的py-console.c
代码：#!/usr/bin/env ruby
require 'gtk3'
require 'base64'
require 'stringio'
#base64格式的图标文件
ICON=<<ICON32_EOF
iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAABmJLR0QA/wD/AP+gvaeTAAAACXBI
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ICON32_EOF
#把图片文件转换成gtk的pixbuf格式
def base642pixbuf data
decode = Base64.decode64 data
loader = Gdk::PixbufLoader.new
loader.write decode
loader.close
return loader.pixbuf
end
#核心代码1 binding=Object.new.send :binding
#没有用irb，看了半天没看明白应该怎么调用，于是自己实现一个最简单的irb
binding=Object.new.send :binding
history,i=[],0
out=StringIO.new
out.sync=true
#把标准输出改到字符流，然后textview读取字符流内容
$stdout=out
Gtk.init
window=Gtk::Window.new
window.resize 400,300
window.title="简陋的gtk-irb"
window.icon=base642pixbuf ICON
window.signal_connect("destroy") do
Gtk.main_quit
end
box=Gtk::Box.new :vertical
window << box
textview=Gtk::TextView.new
textview.wrap_mode=:char
textview.editable=false
buffer=textview.buffer
box.add Gtk::ScrolledWindow.new.add(textview),expand:true,fill:true
hbox=Gtk::Box.new :horizontal
prompt=Gtk::Label.new "[#{history.count+1}] > "
entry=Gtk::Entry.new
entry.signal_connect("key-press-event") do |widget,event|
#具体键盘信号对应的名称需要在/usr/include/gtk-3.0/gdk/gdkkeysyms.h里面查
if event.keyval==Gdk::Keyval::KEY_Return or
event.keyval==Gdk::Keyval::KEY_KP_Enter
buffer.insert buffer.end_iter,"#{prompt.text}#{entry.text}\n"
begin
#核心代码2 binding.eval(entry.text)
buffer.insert buffer.end_iter,
"=> #{binding.eval(entry.text).inspect}\n#{out.string}"
rescue Exception
buffer.insert buffer.end_iter,"#{$!.message}\n#{$!.backtrace.join("\n")}\n"
rescue SystemExit
buffer.insert buffer.end_iter,"#{$!.message}\n#{$!.backtrace.join("\n")}\n"
end
history.unshift entry.text
entry.text,i,out.string="",0,""
prompt.text="[#{history.count+1}] > "
#textview的末尾显示在屏幕上，代码参考的gnumeric的py-console.c
textview.scroll_mark_onscreen(buffer.create_mark(
"textend",buffer.end_iter,false))
elsif event.keyval==Gdk::Keyval::KEY_Up
entry.text=history
i+=1 if i.abs<(history.count-1)
entry.position=entry.text.length
elsif event.keyval==Gdk::Keyval::KEY_Down
if i>0
i-=1
entry.text=history
entry.position=entry.text.length
else
entry.text=""
end
end
end
hbox<< prompt
hbox.add entry,expand:true,fill:true
box<< hbox
entry.set_has_focus true
window.show_all
Gtk.main
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