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Split the config.write_in_file method to be more modular and cleaner

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Will also allow a remove_in_file or whatever to remove options instead
of blanking them.
This commit is contained in:
mathieui 2014-04-21 23:46:12 +02:00
parent d66aa8cf66
commit 266ab8e10d
1 changed files with 89 additions and 43 deletions
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132
src/config.py
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@ -26,7 +26,6 @@ from os import environ, makedirs, path, remove
from shutil import copy2
from args import parse_args
class Config(RawConfigParser):
"""
load/save the config to a file
@ -35,14 +34,14 @@ class Config(RawConfigParser):
RawConfigParser.__init__(self, None)
# make the options case sensitive
self.optionxform = str
self.read_file(file_name)
def read_file(self, file_name):
self.file_name = file_name
self.read_file()
def read_file(self):
try:
RawConfigParser.read(self, file_name, encoding='utf-8')
RawConfigParser.read(self, self.file_name, encoding='utf-8')
except TypeError: # python < 3.2 sucks
RawConfigParser.read(self, file_name)
RawConfigParser.read(self, self.file_name)
# Check config integrity and fix it if it’s wrong
for section in ('bindings', 'var'):
if not self.has_section(section):
@ -70,7 +69,9 @@ class Config(RawConfigParser):
return default
return res
def get_by_tabname(self, option, default, tabname, fallback=True, fallback_server=True):
def get_by_tabname(
self, option, default, tabname,
fallback=True, fallback_server=True):
"""
Try to get the value for the option. First we look in
a section named `tabname`, if the option is not present
@ -144,44 +145,36 @@ class Config(RawConfigParser):
Just find the right section, and then find the
right option, and edit it.
"""
if file_ok(self.file_name):
try:
with open(self.file_name, 'r', encoding='utf-8') as df:
lines_before = (line.strip() for line in df.readlines())
except:
log.error('Unable to read the config file %s',
self.file_name,
exc_info=True)
return False
result = self._parse_file()
if not result:
return False
else:
lines_before = []
result_lines = []
we_are_in_the_right_section = False
written = False
section_found = False
for line in lines_before:
if line.startswith('['): # check the section
if we_are_in_the_right_section and not written:
result_lines.append('%s = %s' % (option, value))
written = True
if line == '[%s]' % section:
we_are_in_the_right_section = True
section_found = True
else:
we_are_in_the_right_section = False
if (line.startswith('%s ' % (option,)) or
line.startswith('%s=' % (option,)) or
line.startswith('%s = ' % (option,))) and we_are_in_the_right_section:
line = '%s = %s' % (option, value)
written = True
result_lines.append(line)
sections, result_lines = result
if not section_found:
if not section in sections:
result_lines.append('[%s]' % section)
result_lines.append('%s = %s' % (option, value))
elif not written:
result_lines.append('%s = %s' % (option, value))
else:
begin, end = sections[section]
added = False
for line in result_lines[begin:end]:
if (line.startswith('%s ' % option) or
line.startswith('%s=' % option)):
pos = result_lines.index(line)
result_lines[pos] = '%s = %s' % (option, value)
added = True
break
if not added:
result_lines.insert(end, '%s = %s' % (option, value))
return self._write_file(result_lines)
def _write_file(self, lines):
"""
Write the config file, write to a temporary file
before copying it to the final destination
"""
try:
prefix, file = path.split(self.file_name)
filename = path.join(prefix, '.%s.tmp' % file)
@ -191,7 +184,7 @@ class Config(RawConfigParser):
os.O_WRONLY | os.O_CREAT,
0o600),
'w')
for line in result_lines:
for line in lines:
fd.write('%s\n' % line)
fd.close()
copy2(filename, self.file_name)
@ -203,6 +196,55 @@ class Config(RawConfigParser):
success = True
return success
def _parse_file(self):
"""
Parse the config file and return the list of sections with
their start and end positions, and the lines in the file.
Duplicate sections are preserved but ignored for the parsing.
Returns an empty tuple if reading fails
"""
if file_ok(self.file_name):
try:
with open(self.file_name, 'r', encoding='utf-8') as df:
lines_before = [line.strip() for line in df]
except:
log.error('Unable to read the config file %s',
self.file_name,
exc_info=True)
return tuple()
else:
lines_before = []
sections = {}
result_lines = []
duplicate_section = False
current_section = ''
current_line = 0
for line in lines_before:
if line.startswith('['):
if not duplicate_section and current_section:
sections[current_section][1] = current_line
duplicate_section = False
current_section = line[1:-1]
if current_section in sections:
log.error('Error while reading the configuration file,'
' skipping until next section')
duplicate_section = True
else:
sections[current_section] = [current_line, current_line]
result_lines.append(line)
current_line += 1
if not duplicate_section:
sections[current_section][1] = current_line
return (sections, result_lines)
def set_and_save(self, option, value, section=DEFSECTION):
"""
set the value in the configuration then save it
@ -221,7 +263,10 @@ class Config(RawConfigParser):
elif current.lower() == "true":
value = "false"
else:
return (_("Could not toggle option: %s. Current value is %s.") % (option, current or _("empty")), 'Warning')
return (_('Could not toggle option: %s.'
' Current value is %s.') %
(option, current or _("empty")),
'Warning')
if self.has_section(section):
RawConfigParser.set(self, section, option, value)
else:
@ -295,7 +340,8 @@ def run_cmdline_args(CONFIG_PATH):
# Copy a default file if none exists
if not path.isfile(options.filename):
default = path.join(path.dirname(__file__), '../data/default_config.cfg')
default = path.join(path.dirname(__file__),
'../data/default_config.cfg')
other = path.join(path.dirname(__file__), 'default_config.cfg')
if path.isfile(default):
copy2(default, options.filename)