133 lines
2.8 KiB
Text
Executable file
133 lines
2.8 KiB
Text
Executable file
e!/usr/bin/python
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import os
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import sys
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import getopt
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__author__ = "Cecil <codeninja@iambitter.org>"
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__version__ = "1.0"
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__licence__ = "GPL"
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opts_short = ['h', 'n', 'o:', 'v', 'V']
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opts_long = ['help', 'no-update', 'output=', 'verbose', 'version']
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opts_desc = ['Displays this information', 'Does not update the pointer to where it left off', 'Where to send the new lines (defaults to stdout)', 'Displays debugging information on stderr', 'Prints version and exits']
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def print_usage():
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sys.stderr.write("""Usage:
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lnl [options] (logfile)
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Available options are:
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""")
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for i in range(0, len(opts_short)):
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argstr = "-%s, --%s"
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if opts_short[i][-1] == ':':
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argstr = "-%s, --%s <arg>" % (opts_short[i][0], opts_long[i][:-1])
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else:
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argstr = "-%s, --%s" % (opts_short[i], opts_long[i])
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argstr = ("%s " % (argstr,))[:24]
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desc = opts_desc[i]
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sys.stderr.write("\n %s %s" % (argstr, desc))
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sys.stderr.write('\n')
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opts, args = getopt.getopt(sys.argv[1:], ''.join(opts_short), opts_long)
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output_f = sys.stdout
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verbose = False
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update_pos = True
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for o, a in opts:
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if o in ('-V', '--version'):
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print_version()
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sys.exit(0)
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elif o in ('-h', '--help'):
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print_usage()
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sys.exit(0)
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elif o in ('-o', '--output'):
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output_f = a
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elif o in ('-v', '--verbose'):
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verbose = True
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elif o in ('-n', '--no-update'):
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update_pos = False
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if len(args) != 1:
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print_usage()
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sys.exit(0)
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args = args[0]
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prefdir = None
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def make_prefs_dir():
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global prefdir
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homedir = os.environ['HOME']
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pwd = open('/etc/passwd', 'r')
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for pwdl in pwd:
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try:
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uname, upass, uid, gid, fullname, home, shell = pwdl.split(':')
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except ValueError:
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continue
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if os.getuid() == int(uid):
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homedir = home
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break
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prefdir = os.path.join(homedir, '.lnl')
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if not os.path.exists(prefdir):
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os.mkdir(prefdir)
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if type(output_f) == str:
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output_f = open(output_f, 'wb')
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make_prefs_dir()
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fn = os.path.realpath(os.path.abspath(args))
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fnn = os.path.split(fn)[1]
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preffn = os.path.join(prefdir, fnn)
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newpf = []
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line_no = 0
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read_pos = 0
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if os.path.exists(preffn):
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pf = open(preffn, 'r')
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for p in pf:
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line_no += 1
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try:
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path, pos = p.split(':')
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except:
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sys.stderr.write("Invalid pref file entry: file %s, line %d\n" % (fnn, line_no))
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continue
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if path == fn:
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read_pos = int(pos)
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newpf += [None]
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else:
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newpf += [p]
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lf = open(fn, 'rb')
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lf.seek(0, 2)
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size = lf.tell()
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lf.seek(0)
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if size < read_pos:
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""" file has been restarted from scratch! """
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while lf.tell() < size:
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output_f.write(lf.read(1024))
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elif size == read_pos:
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""" no changes! """
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sys.exit(0)
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else:
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""" more to read! """
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lf.seek(read_pos)
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while lf.tell() < size:
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output_f.write(lf.read(1024))
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""" rewrite pref file """
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try:
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i = newpf.index(None)
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except ValueError:
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i = len(newpf)
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newpf += [None]
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newpf[i] = "%s:%d\n" % (fn, size)
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pf = open(preffn, 'w')
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pf.write(''.join(newpf))
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