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reflow.py
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reflow.py
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from pprint import pprint
from textwrap import wrap, dedent, fill
import re
def is_list_item(line) -> re.match:
return line.lstrip().startswith('- ')
def is_blank_line(line) -> bool:
return line.strip() == ''
def reflow_list_item(group, into_group, width, list_prefix):
# to dedent list item, need blank + list prefix:
first_line = group[0]
indent_len = len(first_line) - len(first_line.lstrip())
indent = indent_len * ' '
prefix_len = indent_len + len(list_prefix)
# dedent, including the list prefix:
group = [line[prefix_len:] for line in group]
# rewrap:
subsequent_indent = indent + ' '*len(list_prefix)
indent = indent + list_prefix
blob = '\n'.join(group)
new_group = wrap(blob, width, initial_indent=indent, subsequent_indent=subsequent_indent)
into_group.extend(new_group)
def reflow_paragraph(group, into_group, width):
first_line = group[0]
indent_len = len(first_line) - len(first_line.lstrip())
indent = indent_len * ' '
blob = dedent('\n'.join(group))
new_group = wrap(blob, width, initial_indent=indent, subsequent_indent=indent)
into_group.extend(new_group)
def reflow(lines: str, width: int=80):
lines = lines.splitlines()
reflowed_lines = []
group = []
state = 'new' # state enum
for line in lines:
if state == 'new':
if is_blank_line(line):
reflowed_lines.append('')
elif is_list_item(line):
state = 'list_item'
group.append(line)
else:
state = 'paragraph'
group.append(line)
elif state == 'paragraph':
if is_list_item(line) or is_blank_line(line):
# end the previous paragraph: time to re-wrap
if group:
reflow_paragraph(group, reflowed_lines, width)
group = []
if is_blank_line(line):
reflowed_lines.append('')
# print('new paragraph')
else:
state = 'list_item'
group.append(line)
# print('new list item (after paragraph)')
else:
group.append(line)
elif state == 'list_item':
if is_list_item(line) or is_blank_line(line):
# new list item or blank marks end of previous item, format it:
if group:
reflow_list_item(group, reflowed_lines, width, '- ')
group = []
if is_blank_line(line):
reflowed_lines.append('')
state = 'paragraph'
# print('new paragraph (after list item)')
else:
# print(f'new list item')
group.append(line)
else:
raise RuntimeError("BUG! unknown state")
# pprint(group)
if state == 'paragraph':
if group:
reflow_paragraph(group, reflowed_lines, width)
elif state == 'list_item':
if group:
reflow_list_item(group, reflowed_lines, width, '- ')
else:
raise RuntimeError("BUG! unknown state")
return '\n'.join(reflowed_lines)
lines = '''\
Line 1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
Line 2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 2.1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 2.2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 3 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 4 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
Line 1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
Line 2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 2.1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 2.2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 4.1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 4.2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
Line 1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
Line 2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
Line 1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
Line 2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
'''
print(reflow(lines, 40))
print('-------------------------------------------')
print(reflow(lines, 120))
assert reflow(lines, 40) == '''\
Line 1 asfasdfasdf a sf asdf a sdf as f
asdf as f asf aas df asdf as df asdf as
f asdfas Line 2 asfasdfasdf a sf asdf a
sdf as f asdf as f asf aas df asdf as df
asdf as f asdfas
- item 1 asfasdfasdf a sf asdf a sdf as
f asdf as f asf aas df asdf as df asdf
as f asdfas
- item 2 asfasdfasdf a sf asdf a sdf as
f asdf as f asf aas df asdf as df asdf
as f asdfas
- item 2.1 asfasdfasdf a sf asdf a
sdf as f asdf as f asf aas df asdf
as df asdf as f asdfas
- item 2.2 asfasdfasdf a sf asdf a
sdf as f asdf as f asf aas df asdf
as df asdf as f asdfas
- item 3 asfasdfasdf a sf asdf a sdf as
f asdf as f asf aas df asdf as df asdf
as f asdfas
- item 4 asfasdfasdf a sf asdf a sdf as
f asdf as f asf aas df asdf as df asdf
as f asdfas
Line 1 asfasdfasdf a sf asdf a
sdf as f asdf as f asf aas df
asdf as df asdf as f asdfas Line
2 asfasdfasdf a sf asdf a sdf as
f asdf as f asf aas df asdf as
df asdf as f asdfas
- item 1 asfasdfasdf a sf asdf a
sdf as f asdf as f asf aas df
asdf as df asdf as f asdfas
- item 2 asfasdfasdf a sf asdf a
sdf as f asdf as f asf aas df
asdf as df asdf as f asdfas
- item 2.1 asfasdfasdf a sf
asdf a sdf as f asdf as f
asf aas df asdf as df asdf
as f asdfas
- item 2.2 asfasdfasdf a sf
asdf a sdf as f asdf as f
asf aas df asdf as df asdf
as f asdfas
- item 4.1 asfasdfasdf a sf asdf a
sdf as f asdf as f asf aas df asdf
as df asdf as f asdfas
- item 4.2 asfasdfasdf a sf asdf a
sdf as f asdf as f asf aas df asdf
as df asdf as f asdfas
Line 1 asfasdfasdf a sf asdf a sdf
as f asdf as f asf aas df asdf as df
asdf as f asdfas Line 2 asfasdfasdf
a sf asdf a sdf as f asdf as f asf
aas df asdf as df asdf as f asdfas
Line 1 asfasdfasdf a sf asdf a sdf as f
asdf as f asf aas df asdf as df asdf as
f asdfas Line 2 asfasdfasdf a sf asdf a
sdf as f asdf as f asf aas df asdf as df
asdf as f asdfas'''
assert reflow(lines, 120) == '''\
Line 1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas Line 2 asfasdfasdf a sf asdf a
sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 2.1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 2.2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 3 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 4 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
Line 1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas Line 2 asfasdfasdf a sf
asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 2.1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 2.2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 4.1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
- item 4.2 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
Line 1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas Line 2 asfasdfasdf a sf
asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas
Line 1 asfasdfasdf a sf asdf a sdf as f asdf as f asf aas df asdf as df asdf as f asdfas Line 2 asfasdfasdf a sf asdf a
sdf as f asdf as f asf aas df asdf as df asdf as f asdfas'''