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widgets.py
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widgets.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import curses
import textwrap
import translate
COLOR = {"header" : 0, "text" : 0, "send" : 0, "error": 0, "offset" : 0, "key":0, "hint":0, "state": 0}
class TxtWin():
"""Simple widget for displaying text and allowing for scroll"""
# You can speed performance and perhaps reduce screen flicker by issuing
# noutrefresh() calls on all windows, followed by a single curses.doupdate().
PADSIZE = 2000
def __init__(self, title, h, w, y, x, merge=False):
assert w >= 40, "Widget must be at least 40 columns wide"
assert h >= 3, "Widget must be at least 3 lines high"
self.coords = (h,w,y,x)
self.win = curses.newwin(h,w,y,x)
self.win.attrset(COLOR["header"])
if merge:
self.win.border(0,0,0,0,curses.ACS_TTEE,0,curses.ACS_BTEE,curses.ACS_RTEE)
else:
self.win.border(0,0,0,0,0,0,curses.ACS_LTEE,0)
if title: self.win.addstr(0, 3, " %s " % title)
self.win.attrset(0)
self.win.refresh()
self.scrollpos = 0
self.hexoffset = 0
self.pad = curses.newpad(self.PADSIZE, w-2)
self.pad.move(0,0)
def display(self):
h,w,y,x = self.coords
self.pad.refresh(self.scrollpos, 0, y+1, x+1, y+h-2, x+w-2)
def scroll(self, pos="down"):
lpos = self.pad.getyx()[0] - self.coords[0] + 3
scrollins = self.coords[0] // 3 # ⅓ Screen
if pos == "down": self.scrollpos += scrollins
if pos == "up": self.scrollpos -= scrollins
if pos == "home": self.scrollpos = 0
if pos == "end": self.scrollpos = lpos
if self.scrollpos > lpos: self.scrollpos = lpos
if self.scrollpos < 0: self.scrollpos = 0
self.display()
def append(self, s, color="text"):
# check if pad has still enough space left.
br = self.coords[1]-2
nrows = sum([len(x) // br + 1 for x in s.split("\n")])
cy, cx = self.pad.getyx()
if (cy + nrows) >= self.PADSIZE: # uh-oh
rem = nrows - (self.PADSIZE - cy) + 1 # remove just enough rows
self.pad.move(0, 0)
for i in range(rem): self.pad.deleteln()
cy -= rem
if cy < 0: # Ooops, buffer too small (see below)
cy = 0
cx = 0
self.pad.move(cy, cx)
try: # this may still explode if something bigger than buffer is comming in (unlikely)
self.pad.addstr(s, COLOR[color])
except curses.error:
cy, cx = self.pad.getyx()
self.pad.move(cy, 0)
self.pad.addstr(" *** TRUNCATED *** ", COLOR["error"])
def appendHex(self, s, color="text"):
"""render hexdump, consider horizontal space:
cols = self.coords[1] - 2 # substract border
[38 cols; min]|0000 0001020304050607 08090A0B0C0D0E0F|
[40 cols ]|000000 0001020304050607 08090A0B0C0D0E0F|
[42 cols ]|00000000 0001020304050607 08090A0B0C0D0E0F|
[58 cols ]|00000000 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F|
[78 cols; max]|00000000 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F ........ ........ |
"""
cols = self.coords[1] - 3 # available width without border and one space to the left
offsetwidth = min(8, cols - 34)
hexwidth = 2 if cols < 58 else 3
for c in s:
if self.hexoffset % 16 == 0:
brk = "\n" if self.hexoffset > 0 else ""
offstr = "%%0%dX" % offsetwidth % self.hexoffset
self.append(brk + offstr, "offset")
cy, cx = self.pad.getyx()
roff = self.hexoffset % 16
self.pad.move(cy, offsetwidth + hexwidth - (roff < 8) + roff * hexwidth)
self.pad.addstr("%02X" % c, COLOR[color])
if cols >= 78:
self.pad.move(cy, 60 + roff)
self.pad.addstr(chr(c) if 31 < c < 127 else "·", COLOR[color])
self.hexoffset += 1
class Input():
"""Our simple Input-Widget"""
# TODO: Better input handling (←/→ navigate/insert)?
def __init__(self, h, w, y, x):
assert w >= 10, "Widget must be at least 10 columns wide"
assert h >= 3, "Widget must be at least 3 lines high"
self.coords = (h, w, y, x)
self.win = curses.newwin(h, w, y, x)
self.win.attrset(COLOR["header"])
self.win.border()
self.win.attrset(0)
self.inp = ""
self.history = []
self.shist = -1
self.redraw()
def redraw(self):
self.win.addstr(1,1, "> ", COLOR["send"])
self.win.addstr(1,3, " "*(self.coords[1]-4))
self.win.addstr(1,3, self.inp)
self.win.refresh()
def clear(self):
if self.inp and (len(self.history) == 0 or self.inp != self.history[0]):
self.history.insert(0, self.inp)
self.inp = ""
self.shist = -1
self.redraw()
def append(self, c, hexmode=False):
# boundry-check, "scroll" (well, trim left)
if hexmode:
c = "".join(filter(lambda h: h in '01234567890ABCDEF', c.upper()))
if c and len(self.inp.replace(" ", "")) % 2: c += " "
self.inp += c
sw = self.coords[1]-5
if len(self.inp) < sw:
self.win.addstr(c)
else:
self.win.addstr(1,3, self.inp[-sw:])
self.win.refresh()
def goHistory(self, delta=1):
if len(self.history) == 0: return
self.shist += delta
if self.shist < 0:
self.shist = -1
self.inp = ""
else:
if self.shist >= len(self.history):
self.shist = len(self.history) - 1
self.inp = self.history[self.shist]
self.redraw()
def backspace(self, hexmode=False):
sw = self.coords[1]-5
gc = 1
if hexmode and self.inp[-1:] == " ": gc = 2
self.inp = self.inp[:-gc]
if len(self.inp) < sw:
cy, cx = self.win.getyx()
cx -= gc
if cx < 3: cx = 3
self.win.addstr(cy, cx, " ")
self.win.move(cy, cx)
else:
self.win.addstr(1, 3, self.inp[-sw:])
class Toggle():
def __init__(self, win, y, x, key, choices, hint=None, current=0):
self.win = win
self.y, self.x = y, x
self.key = key
self.hint = hint
self.choices = choices
self.current = current
self.smaxlen = max(map(len, self.choices))
try: self.display()
except: pass
def nextState(self):
self.current = (self.current + 1) % len(self.choices)
self.display()
def maxLen(self):
return max(map(len, s))
def display(self):
cy, cx = self.win.getyx()
self.win.addstr(self.y, self.x, " %s " % self.key, COLOR["key"])
if self.hint: self.win.addstr("(%s) " % self.hint, COLOR["hint"])
self.win.addstr(self.getState().center(self.smaxlen)+" ", COLOR["state"])
self.win.move(cy, cx)
self.win.refresh()
def getState(self):
return self.choices[self.current]
class Key():
def __init__(self, win, y, x, key, text, action):
self.win = win
self.y, self.x = y, x
self.key = key
self.text = text
self.action = action
try: self.display()
except: pass
def display(self):
cy, cx = self.win.getyx()
self.win.addstr(self.y, self.x, " %s " % self.key, COLOR["key"])
self.win.addstr(self.text+" ", COLOR["hint"])
self.win.move(cy, cx)
self.win.refresh()
class Gui():
HELP = ["""Keys\n====
F1: Show this help
F2: pause / continue autoscrolling
F4: Clear views / reset counter
F5: Select Input mode (See below)
F6: Append Line-ending on send (Text)
F7: Switch codepage for Textview
F8: Toggle display in/out in hexdump
F10: Quit
PgUp/PgDn: Scroll ⅓ Page up/down
Home/End : Scroll to top or bottom
↓/↑ : go through input-history
Input Modes\n===========
Text:
""","""
Input text with keyboard. Hit Enter to send. It's that easy! Characters above
ASCII will be translated to to selected codepage. If a special character can
not be translated, it is omited (check hexdump). If a Line-end (F6) is
selected, it will be appended to the sent string.
""","""
Hex:
""","""
send binary data: input hex-bytes to be sent (on enter). Only accepts 0-9 a-f.
Each byte must be 2 chars.
""","""
File:
""","""
send a file (binary). In this mode, you can input a valid file- or dir- name.
In case of a directory, it's content is displayed and nothing is sent to the
serial port. E.g.: use "." to view the content of the current dir. If it's a
valid, readable file, it's content is sent unaltered. The content of the file
is displayed in the hexdump as well, if the file is small enough (default:
4kb). Otherwise a placeholder is shown. The input is taken literally, so you
don't have to escape spaces in file- names or something.
You can use TAB to complete filenames (or display ambiguous matches).
"""]
def __init__(self):
ay, ax = curses.LINES, curses.COLS
assert ay >= 8, "Terminal must be at least 8 lines high"
assert ax >= 80, "Terminal must be at least 80 lines wide"
# calculate window-sizes (width).
hw = min(ax//2, 80)
tw = ax-hw
self.in_str = Input(3, ax, ay-3, 0)
self.n2brk = {"None":"", "LF":"\n", "CR": "\r", "CRLF": "\r\n", "0x00": "\0"}
self.out_asc = TxtWin("", ay-2, tw, 0, 0)
self.out_hex = TxtWin("", ay-2, hw+1, 0, tw-1, merge=True)
in_w = self.in_str.coords[1]
hx_s = self.out_hex.coords
self.keys = {
curses.KEY_F1: Key(self.in_str.win, 2, in_w-35, "F1", "Help", self.help),
curses.KEY_F4: Key(self.in_str.win, 2, in_w-24, "F4", "Clear", self.emptyView),
curses.KEY_F10: Key(self.in_str.win, 2, in_w-12, "F10", "Quit", self.quit)
}
as_s = self.out_asc.coords[1]
self.tPau = Toggle(self.out_asc.win, 0, 1, "F2", ["▮▮", "▶"], "")
self.tInp = Toggle(self.in_str.win, 2, 2, "F5", ["Text", "Hex", "File"], "Mode")
self.tBrk = Toggle(self.in_str.win, 2, 20, "F6", list(self.n2brk.keys()), "Line-end")
self.tAsc = Toggle(self.out_asc.win, 0, as_s-30, "F7", list(translate.PAGES.keys()), "Codepage")
self.tHex = Toggle(self.out_hex.win, 0, 3, "F8", ["Both", "Receive", "Send"], "Show Stream")
self.toggles = {
curses.KEY_F2: self.tPau,
curses.KEY_F5: self.tInp,
curses.KEY_F6: self.tBrk,
curses.KEY_F7: self.tAsc,
curses.KEY_F8: self.tHex,
}
self.running = True
def help(self):
def wrop(s):
return textwrap.fill(s,
width=self.out_asc.coords[1] - 3,
initial_indent = "",
subsequent_indent = " ")
pleh = "".join(self.HELP[i*2] + wrop(self.HELP[i*2+1]) for i in range(3))
self.message("\n" + "-"*(self.out_asc.coords[1]-2), "error")
self.message(pleh)
self.message("\n" + "-"*(self.out_asc.coords[1]-2), "error")
self.out_asc.scrollpos -= len(pleh.split("\n")) - self.out_asc.coords[0] + 5
self.out_asc.scroll("none")
def show(self, s, color):
# show stuff in both views and scroll to bottom. s may be (UTF-8) str oder bytearray
# translate input for textview. always show everything there.
su = s.encode(self.tAsc.getState(), "ignore") if type(s) is str else s
self.out_asc.append(translate.translate(su, self.tAsc.getState()), color)
if self.tPau.getState() == "▮▮":
self.out_asc.scroll("end")
else:
self.out_asc.display()
self.hexdump(su, color)
def hexdump(self, s, color):
# selectively untouched hexdump
th = self.tHex.getState()
if th == "Both" or th+color in ("Receivetext", "Sendsend"):
self.out_hex.appendHex(s, color)
if self.tPau.getState() == "▮▮":
self.out_hex.scroll("end")
else:
self.out_hex.display()
def message(self, s, col="offset"): # show message with different color only in textview
self.out_asc.append(s, col)
self.out_asc.scroll("end")
def bscroll(self, s): # scroll both view, if not paused
self.out_asc.scroll(s)
self.out_hex.scroll(s)
def emptyView(self):
self.out_asc.pad.erase()
self.out_hex.pad.erase()
self.out_hex.hexoffset = 0
self.bscroll("end")
def quit(self):
self.running = False