die Frage ist:
Wie lässt sich der description string von OptParse mit Zeilenumbrüchen formatieren? Das ist leider nicht vorgesehen.
Die Frage wurde hier schon nicht beantwortet:
http://www.python-forum.de/topic-2894.html
Nun gibt es aber die Möglichkeit, einen formatter anzugeben:
http://docs.python.org/dev/library/optp ... ing-parser
Der hier "umgebaut" wurde:
http://groups.google.com/group/comp.lan ... 26af0699b1
Wie man das zum Laufen bringt, steht hier:
http://bytes.com/forum/thread734066.html
Ich versuche es so:
Code: Alles auswählen
from optparse \
import OptionParser, \
OptionGroup # parse command line options and arguments
import optparse_linebreakCode: Alles auswählen
parser = OptionParser(...,
formatter = optparse_linebreak.IndentedHelpFormatterWithNL())Code: Alles auswählen
in format_option_help
result.append(formatter.format_option(option))
File "optparse_linebreak.py", line 38, in format_option
opts = option.option_strings
AttributeError: Option instance has no attribute 'option_strings'MfG
optparse_linbreak.py:
Code: Alles auswählen
# From Tim Chase via comp.lang.python.
from optparse import IndentedHelpFormatter
import textwrap
class IndentedHelpFormatterWithNL(IndentedHelpFormatter):
def format_description(self, description):
if not description: return ""
desc_width = self.width - self.current_indent
indent = " "*self.current_indent
# the above is still the same
bits = description.split('\n')
formatted_bits = [
textwrap.fill(bit,
desc_width,
initial_indent=indent,
subsequent_indent=indent)
for bit in bits]
result = "\n".join(formatted_bits) + "\n"
return result
def format_option(self, option):
# The help for each option consists of two parts:
# * the opt strings and metavars
# eg. ("-x", or "-fFILENAME, --file=FILENAME")
# * the user-supplied help string
# eg. ("turn on expert mode", "read data from FILENAME")
#
# If possible, we write both of these on the same line:
# -x turn on expert mode
#
# But if the opt string list is too long, we put the help
# string on a second line, indented to the same column it would
# start in if it fit on the first line.
# -fFILENAME, --file=FILENAME
# read data from FILENAME
result = []
opts = option.option_strings
opt_width = self.help_position - self.current_indent - 2
if len(opts) > opt_width:
opts = "%*s%s\n" % (self.current_indent, "", opts)
indent_first = self.help_position
else: # start help on same line as opts
opts = "%*s%-*s " % (self.current_indent, "", opt_width, opts)
indent_first = 0
result.append(opts)
if option.help:
help_text = option.help
# Everything is the same up through here
help_lines = []
help_text = "\n".join([x.strip() for x in
help_text.split("\n")])
for para in help_text.split("\n\n"):
help_lines.extend(textwrap.wrap(para, self.help_width))
if len(help_lines):
# for each paragraph, keep the double newlines..
help_lines[-1] += "\n"
# Everything is the same after here
result.append("%*s%s\n" % (
indent_first, "", help_lines[0]))
result.extend(["%*s%s\n" % (self.help_position, "", line)
for line in help_lines[1:]])
elif opts[-1] != "\n":
result.append("\n")
return "".join(result) 