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# Extension to format a paragraph
import string
import re
class FormatParagraph:
menudefs = [
('edit', [
('Format Paragraph', '<<format-paragraph>>'),
])
]
keydefs = {
'<<format-paragraph>>': ['<Alt-q>'],
}
unix_keydefs = {
'<<format-paragraph>>': ['<Meta-q>'],
}
def __init__(self, editwin):
self.editwin = editwin
def format_paragraph_event(self, event):
text = self.editwin.text
try:
first = text.index("sel.first")
last = text.index("sel.last")
except TclError:
first = last = None
if first and last:
data = text.get(first, last)
else:
first, last, data = find_paragraph(text, text.index("insert"))
newdata = reformat_paragraph(data)
text.tag_remove("sel", "1.0", "end")
if newdata != data:
text.mark_set("insert", first)
text.delete(first, last)
text.insert(first, newdata)
else:
text.mark_set("insert", last)
text.see("insert")
def find_paragraph(text, mark):
lineno, col = map(int, string.split(mark, "."))
line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
while is_all_white(line):
lineno = lineno + 1
line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
first_lineno = lineno
while not is_all_white(line):
lineno = lineno + 1
line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
last = "%d.0" % lineno
# Search back to beginning of paragraph
lineno = first_lineno - 1
line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
while lineno > 0 and not is_all_white(line):
lineno = lineno - 1
line = text.get("%d.0" % lineno, "%d.0 lineend" % lineno)
first = "%d.0" % (lineno+1)
return first, last, text.get(first, last)
def reformat_paragraph(data, limit=72):
lines = string.split(data, "\n")
i = 0
n = len(lines)
while i < n and is_all_white(lines[i]):
i = i+1
if i >= n:
return data
indent1 = get_indent(lines[i])
if i+1 < n and not is_all_white(lines[i+1]):
indent2 = get_indent(lines[i+1])
else:
indent2 = indent1
new = lines[:i]
partial = indent1
while i < n and not is_all_white(lines[i]):
# XXX Should take double space after period (etc.) into account
words = re.split("(\s+)", lines[i])
for j in range(0, len(words), 2):
word = words[j]
if not word:
continue # Can happen when line ends in whitespace
if len(string.expandtabs(partial + word)) > limit and \
partial != indent1:
new.append(string.rstrip(partial))
partial = indent2
partial = partial + word + " "
if j+1 < len(words) and words[j+1] != " ":
partial = partial + " "
i = i+1
new.append(string.rstrip(partial))
# XXX Should reformat remaining paragraphs as well
new.extend(lines[i:])
return string.join(new, "\n")
def is_all_white(line):
return re.match(r"^\s*$", line) is not None
def get_indent(line):
return re.match(r"^(\s*)", line).group()
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