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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 os
import sys
from subprocess import Popen, PIPE
class Tree():
def __init__(self, root, feeds):
global count, height, width
self.root = root
self.feeds = feeds
self.islinux = ('TERM' not in os.environ) or (os.environ['TERM'] == 'linux')
count = self.count_new(feeds)
self.select_stack = [(None, None)]
self.collapsed_count = 0
height_width = Popen('stty size'.split(' '), stdout = PIPE, stderr = PIPE).communicate()[0]
(height, width) = height_width.decode('utf-8', 'error')[:-1].split(' ')
height, width = int(height), int(width)
self.line = 0
self.curline = 0
self.lineoff = 0
def count_new(self, feeds):
rc = 0
for feed in feeds:
count = 0
if 'inner' in feed:
count = self.count_new(feed['inner'])
feed['new'] = count
else:
count = feed['new']
rc += count
return rc
def is_expanded(self, feed):
return ('expanded' not in feed) or feed['expanded']
def print_node(self, feed, last, indent):
global height, width
title = feed['title']
prefix = indent + ('└' if last else '├')
collapsed = False
if ('inner' not in feed) or (self.is_expanded(feed)):
prefix += '── ' if self.islinux else '─╼ '
else:
collapsed = True
prefix += '─┘ ' if self.islinux else '─┚ '
if feed['new'] > 0:
prefix += '\033[01;31m(%i)\033[00m ' % feed['new']
prefixlen = len('%s--- %s' % (indent, ('(%i) ' % feed['new']) if feed['new'] > 0 else ''))
if prefixlen + len(title) > width:
if width - prefixlen - 3 >= 0:
title = title[: width - prefixlen - 3] + '...'
if self.select_stack[-1][0] is feed:
title = '\033[01;34m%s\033[00m' % title
if self.lineoff <= self.curline < self.lineoff + height:
if self.curline > self.lineoff:
print()
print(prefix + title, end = '')
self.curline += 1
if self.line >= 0:
self.line += 1
if self.select_stack[-1][0] is feed:
self.line = ~self.line
if ('inner' in feed) and not collapsed:
inner = feed['inner']
for feed in inner:
self.print_node(feed, feed is inner[-1], indent + (' ' if last else '│ '))
def print_tree(self):
global height, width, count
self.line = 0
self.curline = 0
height_width = Popen('stty size'.split(' '), stdout = PIPE, stderr = PIPE).communicate()[0]
(height, width) = height_width.decode('utf-8', 'error')[:-1].split(' ')
height, width = int(height), int(width)
print('\033[H\033[2J', end = '')
title = self.root
if len(self.select_stack) == 1:
title = '\033[01;34m%s\033[00m' % title
if self.lineoff <= self.curline < self.lineoff + height:
if count > 0:
print('\033[01;31m(%i)\033[00m ' % count, end = '')
print(title, end = '')
self.line += 1
self.curline += 1
if len(self.select_stack) == 1:
self.line = ~self.line
for feed in self.feeds:
self.print_node(feed, feed is self.feeds[-1], '')
sys.stdout.flush()
self.line = ~self.line
if not (self.lineoff < self.line <= self.lineoff + height):
self.lineoff = self.line - height // 2
if not (self.lineoff < self.line <= self.lineoff + height):
self.lineoff -= 1
if self.lineoff < 0:
self.lineoff = 0
self.print_tree()
def interact(self):
global height, width
self.print_tree()
buf = ''
while True:
buf += sys.stdin.read(1)
buf = buf[-10:]
if buf.endswith('\033[A'):
if self.select_stack[-1][0] is not None:
cur = self.select_stack[-1][0]
curi = self.select_stack[-1][1]
self.select_stack.pop()
if curi > 0:
par = self.select_stack[-1][0]
par = self.feeds if par is None else par['inner']
curi -= 1
cur = par[curi]
self.select_stack.append((cur, curi))
while ('inner' in cur) and self.is_expanded(cur):
curi = len(cur['inner']) - 1
cur = cur['inner'][curi]
self.select_stack.append((cur, curi))
self.print_tree()
elif buf.endswith('\033[1;5A'):
if self.select_stack[-1][0] is not None:
cur = self.select_stack[-1][0]
curi = self.select_stack[-1][1]
self.select_stack.pop()
if curi > 0:
par = self.select_stack[-1][0]
par = self.feeds if par is None else par['inner']
self.select_stack.append((par[curi - 1], curi - 1))
self.print_tree()
elif buf.endswith('\033[B'):
if self.select_stack[-1][0] is None:
if len(self.feeds) > 0:
self.select_stack.append((self.feeds[0], 0))
self.print_tree()
else:
cur = self.select_stack[-1][0]
curi = self.select_stack[-1][1]
if ('inner' in cur) and self.is_expanded(cur):
self.select_stack.append((cur['inner'][0], 0))
self.print_tree()
else:
backup = self.select_stack[:]
while len(self.select_stack) > 1:
par = self.select_stack[-2][0]
par = self.feeds if par is None else par['inner']
self.select_stack.pop()
if curi + 1 < len(par):
self.select_stack.append((par[curi + 1], curi + 1))
backup = None
self.print_tree()
break
cur = self.select_stack[-1][0]
curi = self.select_stack[-1][1]
if backup is not None:
self.select_stack[:] = backup
elif buf.endswith('\033[1;5B'):
while self.select_stack[-1][0] is not None:
cur = self.select_stack[-1][0]
curi = self.select_stack[-1][1]
par = self.select_stack[-2][0]
par = self.feeds if par is None else par['inner']
if curi + 1 < len(par):
self.select_stack.pop()
self.select_stack.append((par[curi + 1], curi + 1))
self.print_tree()
break
elif self.select_stack[-2][0] is not None:
self.select_stack.pop()
else:
break
elif buf.endswith('\033[C'):
if self.select_stack[-1][0] is None:
if len(self.feeds) > 0:
self.select_stack.append((self.feeds[0], 0))
self.print_tree()
else:
cur = self.select_stack[-1][0]
curi = self.select_stack[-1][1]
if 'inner' in cur:
if not self.is_expanded(cur):
cur['expanded'] = True
self.collapsed_count -= 1
self.select_stack.append((cur['inner'][0], 0))
self.print_tree()
elif buf.endswith('\033[D'):
if len(self.select_stack) > 1:
self.select_stack.pop()
self.print_tree()
elif buf.endswith('\033[1;5D'):
self.select_stack[:] = self.select_stack[:1]
self.print_tree()
elif buf.endswith(' '):
cur = self.select_stack[-1][0]
if cur is None:
def expand(feed, value):
if 'inner' in feed:
cur_value = self.is_expanded(feed)
if cur_value != value:
feed['expanded'] = value
self.collapsed_count += -1 if value else 1
for inner in feed['inner']:
expand(inner, value)
value = self.collapsed_count != 0
for feed in self.feeds:
expand(feed, value)
else:
if 'inner' in cur:
value = not self.is_expanded(cur)
self.collapsed_count += -1 if value else 1
cur['expanded'] = value
self.print_tree()
elif buf.endswith(chr(ord('L') - ord('@'))):
self.print_tree()
elif buf.endswith('q'):
return ('quit', None)
elif buf.endswith('e'):
return ('edit', self.select_stack[-1][0])
elif buf.endswith('\t'):
return ('back', None)
elif buf.endswith('\n'):
return ('open', self.select_stack[-1][0])
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