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|
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
'''
featherweight – A lightweight terminal news feed reader
Copyright © 2013 Mattias Andrée (maandree@member.fsf.org)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
import sys
from subprocess import Popen, PIPE
'''
GNU Emacs alike text area
'''
class TextArea(): # TODO support small screens
def __init__(self, fields, datamap, left, top, width, height, termsize):
'''
Constructor
@param fields:list<str> Field names
@param datamap:dist<str, str> Data map
@param left:int Left position of the component
@param top:int Top position of the component
@param width:int Width of the component
@param height:int Height of the component
@param termsize:(int, int) The height and width of the terminal
'''
self.fields, self.datamap, self.left, self.top, self.width, self.height, self.termsize = fields, datamap, left, top, width - 1, height, termsize
def run(self, saver):
'''
Execute text reading
@param saver Save method
'''
innerleft = len(max(self.fields, key = len)) + self.left + 3
leftlines = []
datalines = []
for key in self.fields:
for line in self.datamap[key].split('\n'):
leftlines.append(key)
datalines.append(line)
(termh, termw) = self.termsize
(y, x) = (0, 0)
mark = None
KILL_MAX = 50
killring = []
killptr = None
def status(text):
print('\033[%i;%iH\033[7m%s\033[27m\033[%i;%iH' % (termh - 1, 1, ' (' + text + ') ' + '-' * (termw - len(' (' + text + ') ')), self.top + y, innerleft + x), end='')
status('unmodified')
print('\033[%i;%iH' % (self.top, innerleft), end='')
def alert(text):
if text is None:
alert('')
else:
print('\033[%i;%iH\033[2K%s\033[%i;%iH' % (termh, 1, text, self.top + y, innerleft + x), end='')
modified = False
override = False
(oldy, oldx, oldmark) = (y, x, mark)
stored = chr(ord('L') - ord('@'))
alerted = False
edited = False
print('\033[%i;%iH' % (self.top + y, innerleft + x), end='')
while True:
if (oldmark is not None) and (oldmark >= 0):
if oldmark < oldx:
print('\033[%i;%iH\033[49m%s\033[%i;%iH' % (self.top + oldy, innerleft + oldmark, datalines[oldy][oldmark : oldx], self.top + y, innerleft + x), end='')
elif oldmark > oldx:
print('\033[%i;%iH\033[49m%s\033[%i;%iH' % (self.top + oldy, innerleft + oldx, datalines[oldy][oldx : oldmark], self.top + y, innerleft + x), end='')
if (mark is not None) and (mark >= 0):
if mark < x:
print('\033[%i;%iH\033[44;37m%s\033[49;39m\033[%i;%iH' % (self.top + y, innerleft + mark, datalines[y][mark : x], self.top + y, innerleft + x), end='')
elif mark > x:
print('\033[%i;%iH\033[44;37m%s\033[49;39m\033[%i;%iH' % (self.top + y, innerleft + x, datalines[y][x : mark], self.top + y, innerleft + x), end='')
if y != oldy:
if (oldy > 0) and (leftlines[oldy - 1] == leftlines[oldy]) and (leftlines[oldy] == leftlines[-1]):
print('\033[%i;%iH\033[34m%s\033[39m' % (self.top + oldy, self.left, '>'), end='')
else:
print('\033[%i;%iH\033[34m%s:\033[39m' % (self.top + oldy, self.left, leftlines[oldy]), end='')
if (y > 0) and (leftlines[y - 1] == leftlines[y]) and (leftlines[y] == leftlines[-1]):
print('\033[%i;%iH\033[1;34m%s\033[21;39m' % (self.top + y, self.left, '>'), end='')
else:
print('\033[%i;%iH\033[1;34m%s:\033[21;39m' % (self.top + y, self.left, leftlines[y]), end='')
print('\033[%i;%iH' % (self.top + y, innerleft + x), end='')
(oldy, oldx, oldmark) = (y, x, mark)
if edited:
edited = False
if not modified:
modified = True
status('modified' + (' override' if override else ''))
sys.stdout.flush()
if stored is None:
d = sys.stdin.read(1)
else:
d = stored
stored = None
if alerted:
alerted = False
alert(None)
if ord(d) == ord('@') - ord('@'):
if mark is None:
mark = x
alert('Mark set')
elif mark == ~x:
mark = x
alert('Mark activated')
elif mark == x:
mark = ~x
alert('Mark deactivated')
else:
mark = x
alert('Mark set')
alerted = True
elif ord(d) == ord('K') - ord('@'):
if x == len(datalines[y]):
alert('At end')
alerted = True
else:
mark = len(datalines[y])
stored = chr(ord('W') - ord('@'))
elif ord(d) == ord('W') - ord('@'):
if (mark is not None) and (mark >= 0) and (mark != x):
selected = datalines[y][mark : x] if mark < x else datalines[y][x : mark]
killring.append(selected)
if len(killring) > KILL_MAX:
killring = killring[1:]
stored = chr(127)
else:
alert('No text is selected')
alerted = True
elif ord(d) == ord('Y') - ord('@'):
if len(killring) == 0:
alert('Killring is empty')
alerted = True
else:
mark = None
killptr = len(killring) - 1
yanked = killring[killptr]
print('\033[%i;%iH%s' % (self.top + y, innerleft + x, yanked + datalines[y][x:]), end='')
datalines[y] = datalines[y][:x] + yanked + datalines[y][x:]
x += len(yanked)
print('\033[%i;%iH' % (self.top + y, innerleft + x), end='')
elif ord(d) == ord('X') - ord('@'):
alert('C-x')
alerted = True
sys.stdout.flush()
d = sys.stdin.read(1)
alert(str(ord(d)))
sys.stdout.flush()
if ord(d) == ord('X') - ord('@'):
if (mark is not None) and (mark >= 0):
x ^= mark; mark ^= x; x ^= mark
alert('Mark swapped')
else:
alert('No mark is activated')
elif ord(d) == ord('S') - ord('@'):
last = ''
for row in range(0, len(datalines)):
current = leftlines[row]
if len(datalines[row].strip()) == 0:
if current is not 'comment':
if current != last:
self.datamap[current] = None
continue
if current == last:
self.datamap[current] += '\n' + datalines[row]
else:
self.datamap[current] = datalines[row]
last = current
saver()
status('unmodified' + (' override' if override else ''))
alert('Saved')
elif ord(d) == ord('C') - ord('@'):
break
else:
stored = d
alerted = False
alert(None)
elif (ord(d) == 127) or (ord(d) == 8):
removed = 1
if (mark is not None) and (mark >= 0) and (mark != x):
if mark > x:
x ^= mark; mark ^= x; x ^= mark
removed = x - mark
if x == 0:
alert('At beginning')
alerted = True
continue
dataline = datalines[y]
datalines[y] = dataline = dataline[:x - removed] + dataline[x:]
x -= removed
mark = None
print('\033[%i;%iH%s%s\033[%i;%iH' % (self.top + y, innerleft, dataline, ' ' * removed, self.top + y, innerleft + x), end='')
edited = True
elif ord(d) < ord(' '):
if ord(d) == ord('P') - ord('@'):
if y == 0:
alert('At first line')
alerted = True
else:
y -= 1
mark = None
x = 0
elif ord(d) == ord('N') - ord('@'):
if y < len(datalines) - 1:
y += 1
mark = None
x = 0
elif ord(d) == ord('F') - ord('@'):
if x < len(datalines[y]):
x += 1
print('\033[C', end='')
else:
alert('At end')
alerted = True
elif ord(d) == ord('B') - ord('@'):
if x > 0:
x -= 1
print('\033[D', end='')
else:
alert('At beginning')
alerted = True
elif ord(d) == ord('L') - ord('@'):
empty = '\033[0m' + (' ' * self.width + '\n') * len(datalines)
print('\033[%i;%iH%s' % (self.top, self.left, empty), end='')
for row in range(0, len(leftlines)):
leftline = leftlines[row] + ':'
if (leftlines[row - 1] == leftlines[row]) and (leftlines[row] == leftlines[-1]):
leftline = '>'
print('\033[%i;%iH\033[%s34m%s\033[%s39m' % (self.top + row, self.left, '1;' if row == y else '', leftline, '21;' if row == y else ''), end='')
for row in range(0, len(datalines)):
print('\033[%i;%iH%s\033[49m' % (self.top + row, innerleft, datalines[row]), end='')
print('\033[%i;%iH' % (self.top + y, innerleft + x), end='')
elif d == '\033':
d = sys.stdin.read(1)
if d == '[':
d = sys.stdin.read(1)
if d == 'A':
stored = chr(ord('P') - ord('@'))
elif d == 'B':
if y == len(datalines) - 1:
alert('At last line')
alerted = True
else:
stored = chr(ord('N') - ord('@'))
elif d == 'C':
stored = chr(ord('F') - ord('@'))
elif d == 'D':
stored = chr(ord('B') - ord('@'))
elif d == '2':
d = sys.stdin.read(1)
if d == '~':
override = not override
status(('modified' if modified else 'unmodified') + (' override' if override else ''))
elif d == '3':
d = sys.stdin.read(1)
if d == '~':
removed = 1
if (mark is not None) and (mark >= 0) and (mark != x):
if mark < x:
x ^= mark; mark ^= x; x ^= mark
removed = mark - x
dataline = datalines[y]
if x == len(dataline):
alert('At end')
alerted = True
continue
datalines[y] = dataline = dataline[:x] + dataline[x + removed:]
print('\033[%i;%iH%s%s\033[%i;%iH' % (self.top + y, innerleft, dataline, ' ' * removed, self.top + y, innerleft + x), end='')
mark = None
edited = True
else:
while True:
d = sys.stdin.read(1)
if (ord('a') <= ord(d)) and (ord(d) <= ord('z')): break
if (ord('A') <= ord(d)) and (ord(d) <= ord('Z')): break
if d == '~': break
elif (d == 'w') or (d == 'W'):
if (mark is not None) and (mark >= 0) and (mark != x):
selected = datalines[y][mark : x] if mark < x else datalines[y][x : mark]
killring.append(selected)
mark = None
if len(killring) > KILL_MAX:
killring = killring[1:]
else:
alert('No text is selected')
alerted = True
elif (d == 'y') or (d == 'Y'):
if killptr is not None:
yanked = killring[killptr]
dataline = datalines[y]
if (len(yanked) <= x) and (dataline[x - len(yanked) : x] == yanked):
killptr -= 1
if killptr < 0:
killptr += len(killring)
dataline = dataline[:x - len(yanked)] + killring[killptr] + dataline[x:]
additional = len(killring[killptr]) - len(yanked)
x += additional
datalines[y] = dataline
print('\033[%i;%iH%s%s\033[%i;%iH' % (self.top + y, innerleft, dataline, ' ' * max(0, -additional), self.top + y, innerleft + x), end='')
else:
stored = chr(ord('Y') - ord('@'))
else:
stored = chr(ord('Y') - ord('@'))
elif d == 'O':
d = sys.stdin.read(1)
if d == 'H':
x = 0
elif d == 'F':
x = len(datalines[y])
print('\033[%i;%iH' % (self.top + y, innerleft + x), end='')
elif d == '\n':
stored = chr(ord('N') - ord('@'))
else:
insert = d
if len(insert) == 0:
continue
dataline = datalines[y]
if (not override) or (x == len(dataline)):
print(insert + dataline[x:], end='')
if len(dataline) - x > 0:
print('\033[%iD' % (len(dataline) - x), end='')
datalines[y] = dataline[:x] + insert + dataline[x:]
if (mark is not None) and (mark >= 0):
if mark >= x:
mark += len(insert)
else:
print(insert, end='')
datalines[y] = dataline[:x] + insert + dataline[x + 1:]
x += len(insert)
edited = True
def phonysaver():
pass
print('\033[H\033[2J')
old_stty = Popen('stty --save'.split(' '), stdout = PIPE).communicate()[0]
old_stty = old_stty.decode('utf-8', 'error')[:-1]
Popen('stty -icanon -echo -isig'.split(' '), stdout = PIPE).communicate()
try:
TextArea(['alpha', 'beta'], {'alpha' : 'a', 'beta' : 'be'}, 1, 1, 20, 4, (4, 20)).run(phonysaver)
finally:
print('\033[H\033[2J', end = '')
sys.stdout.flush()
Popen(['stty', old_stty], stdout = PIPE).communicate()
|
