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|
# Copyright (C) 2011-2012 Patrick Totzke <patricktotzke@gmail.com>
# This file is released under the GNU GPL, version 3 or a later revision.
# For further details see the COPYING file
"""
Widgets specific to thread mode
"""
import logging
import re
import urwid
try:
import pygments.lexers, pygments.formatters, pygments.util
have_pygments = True
except ImportError:
have_pygments = False
from .globals import TagWidget
from .globals import AttachmentWidget
from ..settings.const import settings
from ..utils import ansi_term
class MessageSummaryWidget(urwid.WidgetWrap):
"""
one line summary of a :class:`~alot.db.message.Message`.
"""
def __init__(self, message, attr, attr_focus):
"""
:param message: a message
:type message: alot.db.Message
"""
author, address = message.get_author()
text = author if author else address
subj = self._extract_subj(message)
if subj:
text += ': ' + subj
date = message.get_datestring()
if date is not None:
text += " (%s)" % date
cols = [urwid.Text(text)]
if settings.get('msg_summary_hides_threadwide_tags'):
thread_tags = message.thread.get_tags(intersection=True)
outstanding_tags = set(message.get_tags()).difference(thread_tags)
tag_widgets = sorted(TagWidget(t, attr, attr_focus)
for t in outstanding_tags)
else:
tag_widgets = sorted(TagWidget(t, attr, attr_focus)
for t in message.get_tags())
for tag_widget in tag_widgets:
if not tag_widget.hidden:
cols.append(('fixed', tag_widget.width(), tag_widget))
line = urwid.AttrMap(urwid.Columns(cols, dividechars=1),
attr, attr_focus)
super().__init__(line)
def _extract_subj(self, msg):
subj_style = settings.get('thread_message_summary_subject')
if subj_style == 'no':
return ''
try:
subj = ','.join(msg.headers['Subject'])
except KeyError:
return ''
# for "smart" display style, check if normalized subject
# is the same as parent's
if subj_style == 'smart' and msg.parent is not None:
try:
parent_subj = ','.join(msg.parent.headers['Subject'])
except KeyError:
pass
else:
def normalize_subj(subj):
# normalize subject for comparison - replace all
# whitespace sequences with a single space and strip
# leading re:'s
subj = re.sub(r'\s+', ' ', subj)
return re.sub(r'(re:? *)*', '', subj, flags = re.IGNORECASE)
if normalize_subj(subj) == normalize_subj(parent_subj):
return ''
return re.sub(r'\n\s+', r' ', subj)
class _MIMEPartWidget(urwid.WidgetWrap):
# when not None, a list of child _MIMEPartWidget subclasses
_children = None
_fold_level = None
def __init__(self, body_wgt, children = None):
self._children = children
self._fold_level = 0
super().__init__(body_wgt)
@property
def foldlevel(self):
return self._fold_level
@foldlevel.setter
def foldlevel(self, val):
if self._children is None:
return
val_in = max(0, val)
val_out = 0
for ch in self._children:
ch.foldlevel = val_in
val_out = max(val_out, ch.foldlevel)
self._fold_level = val_out
def cycle_alt(self):
if self._children is None:
return
for c in self._children:
c.cycle_alt()
class _CryptPartWidget(_MIMEPartWidget):
def __init__(self, mime_tree, alternative_pref, force_inline_types):
children = None
# handle broken crypto parts where we could not get the payload
if (mime_tree.children is None or
len(mime_tree.children) != 1):
text = 'Invalid "%s" MIME part' % mime_tree.content_type
if mime_tree.crypt_error:
text += ': ' + mime_tree.crypt_error
body_wgt = urwid.Text(text, align = 'center')
else:
text_parts = []
if mime_tree.is_encrypted and mime_tree.is_signed:
desc = 'encrypted+signed'
if mime_tree.is_encrypted:
desc = 'encrypted'
elif mime_tree.is_signed:
desc = 'signed'
text_parts.append(desc + ' MIME part')
if mime_tree.is_signed and mime_tree.sig_valid:
if mime_tree.sig_trusted:
trust = 'trusted'
attr_name = 'crypt_trusted'
else:
trust = 'untrusted'
attr_name = 'crypt_untrusted'
t = 'valid %s signature from "%s"' % (trust, mime_tree.signer_id)
text_parts.append(t)
else:
attr_name = 'crypt_unsigned'
if mime_tree.crypt_error:
text_parts.append('crypto processing error: ' + mime_tree.crypt_error)
attr_name = 'crypt_invalid'
child = _render_mime_tree(mime_tree.children[0], alternative_pref, force_inline_types) \
or _EmptyPartWidget()
attr = settings.get_theming_attribute('thread', attr_name)
body_wgt = urwid.AttrMap(urwid.LineBox(child, title = ':'.join(text_parts)), attr)
children = [child]
super().__init__(body_wgt, children)
class _MultiMixedWidget(_MIMEPartWidget):
def __init__(self, children):
super().__init__(urwid.Pile(children), children)
class _MultiAltWidget(_MIMEPartWidget):
_cur_idx = None
_child_parts = None
_sel_placeholder = None
def __init__(self, child_widgets, child_parts, alternative_pref):
self._child_parts = child_parts
child_idx = None
for idx, ch in enumerate(child_parts):
if ch.content_type == alternative_pref:
child_idx = idx
break
if child_idx is None:
child_idx = 0
self._sel_placeholder = urwid.WidgetPlaceholder(urwid.Text(''))
body_wgt = urwid.LineBox(self._sel_placeholder)
super().__init__(body_wgt, child_widgets)
self._select_alt(child_idx)
def _select_alt(self, idx):
child_part = self._child_parts[idx]
child_wgt = self._children[idx]
self._w.set_title('Alternative MIME part %d/%d: %s' %
(idx + 1, len(self._children), child_part.content_type))
self._sel_placeholder.original_widget = child_wgt
self._cur_idx = idx
def cycle_alt(self):
self._select_alt((self._cur_idx + 1) % len(self._children))
class _Fold:
level = None
start = None
end = None
children = None
def __init__(self, level, start, end):
self.children = []
self.level = level
self.start = start
self.end = end
def fold(self, lines, level, context):
ret = []
if level == self.level:
# this level is the lowest folded one
# display only the context
ctx_start, ctx_end = context
length = self.end - self.start
if length <= ctx_start + ctx_end + 1:
ret.extend(lines[self.start:self.end])
else:
ret.extend(lines[self.start:self.start + ctx_start])
attr = ret[-1][0]
ret.append((attr, '%s [...%d lines folded...]\n' %
('> ' * level, length - ctx_start - ctx_end)))
ret.extend(lines[self.end - ctx_end:self.end])
elif level > self.level:
# this level is not folded, display as-is
# but we still need to fold the children individually
# start by adding lines before the first child, or all
# lines when there are no children
end = self.children[0].start if self.children else self.end
ret.extend(lines[self.start:end])
for i, c in enumerate(self.children):
# fold the child recursively
ret.extend(c.fold(lines, level, context))
# add lines inbetween this child's end and next child's start
# or our end if this is the last child
next_start = self.children[i + 1].start if (i + 1 < len(self.children)) \
else self.end
ret.extend(lines[c.end:next_start])
return ret
def __repr__(self):
return 'Fold(%d, %d, %d, %s)' % \
(self.level, self.start, self.end, self.children)
class _TextPart(_MIMEPartWidget):
_QUOTE_CHARS = '>|:}#'
_QUOTE_REGEX = '(([ \t]*[{quote_chars}])+)'.format(quote_chars = _QUOTE_CHARS)
_body_placeholder = None
_max_level = None
_lines = None
_fold = None
def __init__(self, text, part):
attr_text = settings.get_theming_attribute('thread', 'body')
attrs_quote = settings.get_quote_theming()
self._fold_context = settings.get('thread_fold_context')
# color git patches using pygments
# FIXME this is quite ad-hoc
# make it more configurable, detect other patch formats
# and possibly other kinds of text
if (('x-mailer' in part.headers and
part.headers['x-mailer'][0].startswith('git-send-email')) or
part.content_type in ('text/x-diff', 'text/x-patch')):
# process as patch
if have_pygments:
try:
lexer = pygments.lexers.get_lexer_by_name('diff')
formatter = pygments.formatters.get_formatter_by_name('terminal')
text = pygments.highlight(text, lexer, formatter)
except pygments.util.ClassNotFound:
logging.debug('Could not get a lexer/formatter for diff highlighting')
self._lines = ansi_term.parse_escapes_to_urwid(text, attr_text)
self._fold = _Fold(0, 0, len(self._lines))
self._max_level = 0
if self._lines is None:
# process as a normal text mail body:
# detect quoted blocks
self._lines, self._fold, self._max_level = \
self._parse_quotes(text, attr_text, attrs_quote)
self._body_placeholder = urwid.WidgetPlaceholder(urwid.Text(''))
# decorate inline-forced attachments with a linebox
if part.attachment:
title = 'attachment %s' % part.content_type
fname = part.attachment.get_filename()
if fname:
title += ': %s' % fname
wgt = urwid.LineBox(self._body_placeholder, title = title)
else:
wgt = self._body_placeholder
super().__init__(wgt)
def _parse_quotes(self, text, attr_text, attrs_quote):
"""
Parse quotes in email body, generate folds and theming from them.
"""
# first pass: assign a level to each line based on the number of quote
# characters at the beginning
lines = text.splitlines(keepends = True)
blocks = []
for i, line in enumerate(lines):
level = 0
m = re.match(self._QUOTE_REGEX, line)
if m is not None:
quote_prefix = m.group(0)
remainder = line[len(quote_prefix):]
for c in self._QUOTE_CHARS:
level += quote_prefix.count(c)
else:
quote_prefix = ''
remainder = line
if len(blocks) == 0 or blocks[-1]['level'] != level:
# start a new block
blocks.append({ 'level' : level, 'start' : i, 'end' : i, 'data_empty' : True})
blocks[-1]['end'] += 1
if blocks[-1]['data_empty'] and len(remainder.strip()) > 0:
blocks[-1]['data_empty'] = False
# second pass: every quoted block where the remainder (line minus the
# leading quote characters) is empty gets merged into an adjacent quoted
# block, higher level preferred
for idx, b in enumerate(blocks):
if b['level'] > 0 and b['data_empty']:
b_prev = blocks[idx - 1] if idx > 0 else None
b_next = blocks[idx + 1] if idx + 1 < len(blocks) else None
merge_level = None
if (b_prev is not None and not b_prev['data_empty'] and
b_prev['level'] > 0):
merge_level = b_prev['level']
if (b_next is not None and not b_next['data_empty'] and
(merge_level is None or merge_level < b_next['level'])):
merge_level = b_next['level']
if merge_level is not None:
b['level'] = merge_level
fold_stack = []
cur_fold = _Fold(0, 0, 0)
max_level = 0
for b in blocks:
max_level = max(max_level, b['level'])
if b['level'] > cur_fold.level:
fold_stack.append(cur_fold)
cur_fold = _Fold(b['level'], b['start'], b['end'])
else:
while b['level'] < cur_fold.level:
child = cur_fold
if fold_stack[-1].level < cur_fold.level - 1:
cur_fold = _Fold(cur_fold.level - 1, cur_fold.start, cur_fold.end)
else:
cur_fold = fold_stack.pop()
cur_fold.children.append(child)
cur_fold.end = max(cur_fold.end, child.end)
cur_fold.end = b['end']
while fold_stack:
fold_stack[-1].children.append(cur_fold)
cur_fold = fold_stack.pop()
assert(cur_fold.level == 0)
cur_fold.end = len(lines)
def color_lines(fold, lines, colored_lines):
if fold.level == 0 or len(attrs_quote) < 1:
attr = attr_text
else:
attr = attrs_quote[(fold.level - 1) % len(attrs_quote)]
colored_lines[fold.start:fold.end] = [(attr, line) for line in lines[fold.start:fold.end]]
for c in fold.children:
color_lines(c, lines, colored_lines)
colored_lines = lines[:]
color_lines(cur_fold, lines, colored_lines)
return colored_lines, cur_fold, max_level
@property
def foldlevel(self):
return self._fold_level
@foldlevel.setter
def foldlevel(self, val):
val = max(1, min(self._max_level + 1, val))
logging.info('settting foldlevel to %d', val)
markup_lines = self._fold.fold(self._lines, val,
self._fold_context)
if len(markup_lines) == 0:
markup_lines = ['']
self._body_placeholder.original_widget = urwid.Text(markup_lines)
self._fold_level = val
class _EmptyPartWidget(_MIMEPartWidget):
def __init__(self):
body_wgt = urwid.Text('<<< No displayable content >>>', align = 'center')
super().__init__(body_wgt)
def _handle_multipart(mime_tree, alternative_pref, force_inline_types):
children = []
for child in mime_tree.children:
ch = _render_mime_tree(child, alternative_pref, force_inline_types)
if ch is not None and not isinstance(ch, _EmptyPartWidget):
children.append(ch)
if len(children) > 0:
# there exist some intelligence-challenged systems in the wild producing
# multipart/alternative with just a single alternative - treat those as
# mixed and so avoid displaying pointless decorations
if mime_tree.is_alternative and len(children) > 1:
return _MultiAltWidget(children, mime_tree.children, alternative_pref)
return _MultiMixedWidget(children)
def _render_mime_tree(mime_tree, alternative_pref, force_inline_types):
# handle encrypted/signed parts
if mime_tree.is_signed or mime_tree.is_encrypted:
return _CryptPartWidget(mime_tree, alternative_pref, force_inline_types)
if mime_tree.children is not None:
# multipart MIME parts
return _handle_multipart(mime_tree, alternative_pref, force_inline_types)
## no children - this is a leaf node
# skip attachment parts, unless they are of a user-specified type
if mime_tree.attachment:
force_inline = False
for t in force_inline_types:
maintype, _, subtype = t.partition('/')
if (maintype == mime_tree.content_maintype and
(subtype == mime_tree.content_subtype or subtype == '*')):
force_inline = True
break
if not force_inline:
return None
# try rendering the message
text = mime_tree.render_str()
if text is not None:
return _TextPart(text, mime_tree) if len(text) else _EmptyPartWidget()
body_wgt = urwid.Text('Undisplayable "%s" MIME part.' % mime_tree.content_type,
align = 'center')
return _MIMEPartWidget(body_wgt)
class HeadersWidget(urwid.WidgetWrap):
"""
A flow widget displaying message headers.
"""
_key_attr = None
_value_attr = None
_gaps_attr = None
def __init__(self, key_attr, value_attr, gaps_attr):
"""
:param headerslist: list of key/value pairs to display
:type headerslist: list of (str, str)
:param key_attr: theming attribute to use for keys
:type key_attr: urwid.AttrSpec
:param value_attr: theming attribute to use for values
:type value_attr: urwid.AttrSpec
:param gaps_attr: theming attribute to wrap lines in
:type gaps_attr: urwid.AttrSpec
"""
self._key_attr = key_attr
self._value_attr = value_attr
self._gaps_attr = gaps_attr
super().__init__(urwid.Pile([]))
def set_headers(self, headers):
if len(headers) == 0:
self._w.contents.clear()
return
max_key_len = max(map(lambda x: len(x[0]), headers))
widgets = []
for key, value in headers:
# TODO even/odd
keyw = ('fixed', max_key_len + 1,
urwid.Text((self._key_attr, key)))
valuew = urwid.Text((self._value_attr, value))
linew = urwid.AttrMap(urwid.Columns([keyw, valuew]), self._gaps_attr)
widgets.append(linew)
self._w.contents = [(w, ('pack', None)) for w in widgets]
def _make_ascii_trans():
trans = {
0x09 : ' ' * 8, # tab
0x0b : '<\\v>\n', # vertical tab
0x0c : '<\\f>\n', # form feed
0x0d : '', # carriage return
}
for i in range(256):
if (i >= 0x20 and i <= 0x7e) or i == 0x0a:
# printables and \n
trans[i] = chr(i)
elif not i in trans:
trans[i] = r'<\x%x>' % i
return trans
_ascii_trans = _make_ascii_trans()
def _ascii_to_printable(data):
"""
Prepare ASCII data for printing.
:param data: input data
:type data: bytes
:returns: Data suitable for printing. It will contain only printable
characters (U+0020-U+007E) and a newline (U+000A).
:rtype: str
"""
return data.decode('latin1').translate(_ascii_trans)
class _RawMessageWidget(urwid.WidgetWrap):
"""
A flow widget displaying the "raw" message.
"""
def __init__(self, msg_bytes):
sourcetxt = _ascii_to_printable(msg_bytes)
super().__init__(urwid.Text(sourcetxt))
class MessageWidget(urwid.WidgetWrap):
"""
A flow widget displaying the contents of a single :class:`alot.db.Message`.
"""
_display_all_headers = None
_display_source = None
_headers_wgt = None
_source_wgt = None
_body_wgt = None
_attach_wgt = None
def __init__(self, message):
"""
:param message: Message to display
:type message: alot.db.Message
"""
self._message = message
force_inline_types = settings.get('thread_force_inline_mimetypes')
if settings.get('prefer_plaintext'):
alternative_pref = 'text/plain'
else:
alternative_pref = 'text/html'
self._headers_wgt = self._get_headers()
self._source_wgt = _RawMessageWidget(message.as_bytes())
self._attach_wgt = self._get_attachments()
self._body_wgt = _render_mime_tree(message.body, alternative_pref, force_inline_types)
if self._body_wgt is None:
self._body_wgt = _EmptyPartWidget()
super().__init__(urwid.ListBox(urwid.SimpleListWalker([])))
self.display_all_headers = False
self.display_source = False
self.foldlevel = settings.get('thread_fold_initial_level')
def get_message(self):
return self._message
def _get_headers(self):
key_attr = settings.get_theming_attribute('thread', 'header_key')
value_attr = settings.get_theming_attribute('thread', 'header_value')
gaps_attr = settings.get_theming_attribute('thread', 'header')
return HeadersWidget(key_attr, value_attr, gaps_attr)
def _get_attachments(self):
alist = []
for a in self._message.iter_attachments():
alist.append(AttachmentWidget(a))
if alist:
return urwid.Pile(alist)
return None
@property
def display_all_headers(self):
return self._display_all_headers
@display_all_headers.setter
def display_all_headers(self, val):
val = bool(val)
if val == self._display_all_headers:
return
headers = self._message.headers
lines = []
if val:
# collect all header/value pairs in the order they appear
lines = list(headers.items())
else:
# only a selection of headers should be displayed.
# use order of the `headers` parameter
for key in settings.get('displayed_headers'):
if key in headers:
if key.lower() in ['cc', 'bcc', 'to']:
lines.append((key, ', '.join(headers[key])))
else:
for value in headers[key]:
lines.append((key, value))
elif key.lower() == 'tags':
# TODO this should be in a separate widget
logging.debug('want tags header')
values = []
for t in self._message.get_tags():
tagrep = settings.get_tagstring_representation(t)
if t is not tagrep['translated']:
t = '%s (%s)' % (tagrep['translated'], t)
values.append(t)
lines.append((key, ', '.join(values)))
self._headers_wgt.set_headers(lines)
self._display_all_headers = val
@property
def display_source(self):
return self._display_source
@display_source.setter
def display_source(self, val):
val = bool(val)
if val == self._display_source:
return
widgets = []
if val:
widgets.append(self._source_wgt)
else:
widgets.append(self._headers_wgt)
if self._attach_wgt is not None:
widgets.append(self._attach_wgt)
widgets.append(self._body_wgt)
self._w.body[:] = widgets
self._display_source = val
@property
def foldlevel(self):
return self._body_wgt.foldlevel
@foldlevel.setter
def foldlevel(self, val):
self._body_wgt.foldlevel = val
def cycle_alt(self):
self._body_wgt.cycle_alt()
def get_selected_attachment(self):
"""
If an AttachmentWidget is currently focused, return it. Otherwise return
None.
"""
if self._w.focus is self._attach_wgt:
return self._attach_wgt.focus.attachment
return None
class ThreadNode(urwid.WidgetWrap):
_ARROW = '➤'
_HBAR = '─'
_VBAR = '│'
_TNODE = '├'
_CORNER = '└'
_decor_text = None
_have_next_sibling = None
def __init__(self, msg, thread, pos, indent):
parity = 'odd' if pos & 1 else 'even'
attr = settings.get_theming_attribute('thread', 'summary', parity)
attr_focus = settings.get_theming_attribute('thread', 'summary', 'focus')
msg_summary = MessageSummaryWidget(msg, attr, attr_focus)
if msg.depth == 0:
wgt = msg_summary
else:
self._decor_text = urwid.Text('')
wgt = urwid.Columns([('pack', self._decor_text), msg_summary])
ancestor_chain = [msg]
for p in msg.parents():
ancestor_chain.insert(0, p)
have_sibling = []
for d, m in enumerate(ancestor_chain):
if d == 0:
have_sibling.append(m != thread.toplevel_messages[-1])
else:
have_sibling.append(m != ancestor_chain[d - 1].replies[-1])
self._have_next_sibling = have_sibling
super().__init__(wgt)
self.set_indent(indent)
def set_indent(self, indent):
if self._decor_text is None:
return
seg_text = []
if indent > 0:
depth = len(self._have_next_sibling) - 1
for d in range(depth):
if d == depth - 1:
corner = self._TNODE if self._have_next_sibling[d + 1] else self._CORNER
seg_text.append(corner + self._ARROW)
else:
bar = self._VBAR if self._have_next_sibling[d + 1] else ' '
seg_text.append(bar + ' ')
self._decor_text.set_text(''.join(seg_text))
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