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#!/usr/bin/env python3
r'''
------------------------------------------------------------------------------
webquiz_util | utilty functions
------------------------------------------------------------------------------
Copyright (C) Andrew Mathas, University of Sydney
Distributed under the terms of the GNU General Public License (GPL)
http://www.gnu.org/licenses/
This file is part of the WebQuiz system.
<Andrew.Mathas@sydney.edu.au>
------------------------------------------------------------------------------
'''
import os
import subprocess
import shutil
import stat
import sys
import traceback
# ---------------------------------------------------------------------------------------
# Return the full path for a file in the webquiz directory
webquiz_file = lambda file: os.path.join(os.path.dirname(os.path.realpath(__file__)), file)
def shell_command(cmd):
r'''
Short-cut for shell commands
'''
return subprocess.check_output(cmd, stderr=subprocess.STDOUT, shell=True).decode('ascii').strip()
def kpsewhich(search):
r'''
Short-cut to access kpsewhich output.
usage: kpsewhich('-var-value=TEXMFLOCAL')
'''
return subprocess.check_output('kpsewhich ' + search, shell=True).decode('ascii').strip()
# ---------------------------------------------------------------------------------------
class MetaData(dict):
r"""
A dummy class for reading, accessing and storing key-value pairs from
a file. Any internal spaces in the key name are replaced with underscores
and lines without a key-value pair are ignored.
The key-value pairs are available as both attributes and items
Usage: MetaData(filename) or MetaData(filename, key-value pairs)
"""
def __init__(self, filename, **args):
dict.__init__(self)
# add attributes from **args
for key in args:
setattr(self, key, args[key])
with open(filename, 'r') as meta:
for line in meta:
if '=' in line:
key, val = line.strip().split('=')
if key.strip() != '':
self.__setitem__(key.strip().lower().replace(' ', '_'),
val.strip())
setattr(self,
key.strip().lower().replace(' ', '_'),
val.strip())
#################################################################################
def webquiz_debug(debugging, *arg):
if debugging:
sys.stderr.write(' '.join('{}'.format(a) for a in arg)+'\n')
#################################################################################
def webquiz_error(debugging, msg, err=None):
r'''
Consistent handling of errors in magthquiz: print the message `msg` and
exist with error code `err.errno` if it is available.abs
'''
print('{dash}WebQuiz error:\n {msg}\n{dash}'.format(
msg=msg, dash='-'*40+'\n')
)
if err is not None:
trace = traceback.extract_tb(sys.exc_info()[2])
filename, lineno, fn, text = trace[-1]
print('File: {}, line number: {}\nError {} in {}: {}'.format(
filename, lineno, err, fn, text))
if debugging and err is not None:
raise
if hasattr(err, 'errno'):
sys.exit(err.errno)
sys.exit(1)
###############################################################################
def copytree(src, dst, symlinks=False, ignore=None):
r''' Recursively copy directory tree, fixing shutil.copytree
from https://stackoverflow.com/questions/1868714
'''
if not os.path.exists(dst):
os.makedirs(dst)
shutil.copystat(src, dst)
lst = os.listdir(src)
if ignore:
excl = ignore(src, lst)
lst = [x for x in lst if x not in excl]
for item in lst:
s = os.path.join(src, item)
d = os.path.join(dst, item)
if symlinks and os.path.islink(s):
if os.path.lexists(d):
os.remove(d)
os.symlink(os.readlink(s), d)
try:
st = os.lstat(s)
mode = stat.S_IMODE(st.st_mode)
os.lchmod(d, mode)
except OSError:
pass # lchmod not available
elif os.path.isdir(s):
copytree(s, d, symlinks, ignore)
else:
shutil.copy2(s, d)
###############################################################################
## shortcuts for running commands
environ = os.environ.copy()
def run(cmd, shell=False):
r'''
Run commands with output to stdout and errors to stderr
'''
if shell:
subprocess.call(cmd, env=environ, shell=True)
else:
subprocess.call(cmd.split(), env=environ)
def quiet_run(cmd, shell=False):
r'''
Run commands with ignoring and sending errors to stderr
'''
if shell:
subprocess.call(cmd, env=environ, stdout=open(os.devnull, 'wb'), shell=True)
else:
subprocess.call(cmd.split(), env=environ, stdout=open(os.devnull, 'wb'))
def silent_run(cmd, shell=False):
r'''
Run commands ignoring all output and errors
'''
if shell:
subprocess.call(cmd, env=environ, stdout=open(os.devnull, 'wb'), stderr=open(os.devnull, 'wb'), shell=True)
else:
subprocess.call(cmd.split(), env=environ, stdout=open(os.devnull, 'wb'), stderr=open(os.devnull, 'wb'))
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