text-gui

#!/usr/bin/env python
# text-gui - Show arbitrary text in a simple GUI.
# May be useful in scripts bound to window manager shortcuts or the like.

# TODO:
# - ctrl+s to save to a file?

# settings

# dimensions (defaults; can be overridden by arguments)
default_width = 700
default_height = 800
default_max_width = 700
default_max_height = 800

# theme
text_fg = "#38f"
text_bg = "#320"
cursor_bg = "#eee"
title_fg = "#eee"
title_bg = "#111"
scroll_fg = text_fg
scroll_bg = text_bg

# actions
actions = []

# code

import os, argparse
from sys import stdin
from tkinter import *
from tkinter import scrolledtext
import tkinter.font as tkFont

def change_font_size(font, change):
  """Add CHANGE to the size of the font."""
  font.configure(size=font["size"]+change)

def get_input_text(widget):
  """Get the string of text in the input field."""
  return ''.join(map(lambda x: x[1], widget.dump('1.0', END, text=True)))[:-1]

def run_action(widget, command):
  """Run COMMAND, passing the text of WIDGET to its stdin."""
  text = get_input_text(widget)
  pipe = os.popen(command, 'w')
  pipe.write(text)
  pipe.close()

def make_window(text, title=None, width=default_width, height=default_height, max_width=default_max_width, max_height=default_max_height):
  """Create the text-gui window."""
  root = Tk()
  root.title(title or "text-gui")
  root.minsize(width, height)
  if max_width:
    root.maxsize(max_width, max_height)

  font = tkFont.Font(size=12)

  if title:
    label = Label(root, text=title, font=tkFont.Font(size=13), fg=title_fg, bg=title_bg)
    label.pack(fill=X)

  textbox = scrolledtext.ScrolledText(root, font=font, fg=text_fg, bg=text_bg, insertbackground=cursor_bg)
  textbox.vbar.config(troughcolor=scroll_bg, bg=scroll_fg)
  textbox.pack(fill=BOTH, expand=True)
  textbox.insert(END, text)

  root.bind("<Control-equal>", lambda e: change_font_size(font, 1))
  root.bind("<Control-minus>", lambda e: change_font_size(font, -1))

  root.bind("<Escape>", lambda e: quit())
  root.bind("<Control-g>", lambda e: quit())

  for action in actions:
    binding, command = action.split('=', maxsplit=1)
    root.bind("<" + binding + ">", lambda e: run_action(textbox, command))

  root.mainloop()

if __name__ == "__main__":
  parser = argparse.ArgumentParser(description="Show arbitrary text in a simple GUI.")
  parser.add_argument("-T", "--title", dest="title", help="The title of the window")
  parser.add_argument("-t", "--text", dest="text", help="The text of the window; if not provided, will be read from stdin")
  parser.add_argument("-W", "--width", dest="width", type=int, help="The window's initial width")
  parser.add_argument("-H", "--height", dest="height", type=int, help="The window's initial height")
  parser.add_argument("--max-width", dest="max_width", type=int, help="The window's max width")
  parser.add_argument("--max-height", dest="max_height", type=int, help="The window's max height")
  parser.add_argument("-a", "--action", dest="action", nargs='*', type=str, help="Set the command to run when a specified key is pressed. The command is passed the textual contents of the GUI via stdin. Example: --action Control-s=foo will send the text to the stdin of \"foo\" when ctrl+s is pressed. Note that this argument can be passed multiple times.")

  args = parser.parse_args()

  text = args.text or stdin.read()
  title = args.title
  width = args.width or default_width
  height = args.height or default_height
  max_width = args.max_width or default_max_width
  max_height = args.max_height or default_max_height
  actions = args.action or []

  make_window(text, title=title, width=width, height=height, max_width=max_width, max_height=max_height)