| 1 | """Mailcap file handling. See RFC 1524."""
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| 2 |
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| 3 | import os
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| 4 |
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| 5 | __all__ = ["getcaps","findmatch"]
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| 6 |
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| 7 | # Part 1: top-level interface.
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| 8 |
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| 9 | def getcaps():
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| 10 | """Return a dictionary containing the mailcap database.
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| 11 |
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| 12 | The dictionary maps a MIME type (in all lowercase, e.g. 'text/plain')
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| 13 | to a list of dictionaries corresponding to mailcap entries. The list
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| 14 | collects all the entries for that MIME type from all available mailcap
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| 15 | files. Each dictionary contains key-value pairs for that MIME type,
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| 16 | where the viewing command is stored with the key "view".
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| 17 |
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| 18 | """
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| 19 | caps = {}
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| 20 | for mailcap in listmailcapfiles():
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| 21 | try:
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| 22 | fp = open(mailcap, 'r')
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| 23 | except IOError:
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| 24 | continue
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| 25 | morecaps = readmailcapfile(fp)
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| 26 | fp.close()
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| 27 | for key, value in morecaps.iteritems():
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| 28 | if not key in caps:
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| 29 | caps[key] = value
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| 30 | else:
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| 31 | caps[key] = caps[key] + value
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| 32 | return caps
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| 33 |
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| 34 | def listmailcapfiles():
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| 35 | """Return a list of all mailcap files found on the system."""
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| 36 | # XXX Actually, this is Unix-specific
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| 37 | if 'MAILCAPS' in os.environ:
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| 38 | str = os.environ['MAILCAPS']
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| 39 | mailcaps = str.split(':')
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| 40 | else:
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| 41 | if 'HOME' in os.environ:
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| 42 | home = os.environ['HOME']
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| 43 | else:
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| 44 | # Don't bother with getpwuid()
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| 45 | home = '.' # Last resort
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| 46 | mailcaps = [home + '/.mailcap', '/etc/mailcap',
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| 47 | '/usr/etc/mailcap', '/usr/local/etc/mailcap']
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| 48 | return mailcaps
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| 49 |
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| 50 |
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| 51 | # Part 2: the parser.
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| 52 |
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| 53 | def readmailcapfile(fp):
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| 54 | """Read a mailcap file and return a dictionary keyed by MIME type.
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| 55 |
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| 56 | Each MIME type is mapped to an entry consisting of a list of
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| 57 | dictionaries; the list will contain more than one such dictionary
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| 58 | if a given MIME type appears more than once in the mailcap file.
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| 59 | Each dictionary contains key-value pairs for that MIME type, where
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| 60 | the viewing command is stored with the key "view".
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| 61 | """
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| 62 | caps = {}
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| 63 | while 1:
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| 64 | line = fp.readline()
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| 65 | if not line: break
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| 66 | # Ignore comments and blank lines
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| 67 | if line[0] == '#' or line.strip() == '':
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| 68 | continue
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| 69 | nextline = line
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| 70 | # Join continuation lines
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| 71 | while nextline[-2:] == '\\\n':
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| 72 | nextline = fp.readline()
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| 73 | if not nextline: nextline = '\n'
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| 74 | line = line[:-2] + nextline
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| 75 | # Parse the line
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| 76 | key, fields = parseline(line)
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| 77 | if not (key and fields):
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| 78 | continue
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| 79 | # Normalize the key
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| 80 | types = key.split('/')
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| 81 | for j in range(len(types)):
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| 82 | types[j] = types[j].strip()
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| 83 | key = '/'.join(types).lower()
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| 84 | # Update the database
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| 85 | if key in caps:
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| 86 | caps[key].append(fields)
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| 87 | else:
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| 88 | caps[key] = [fields]
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| 89 | return caps
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| 90 |
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| 91 | def parseline(line):
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| 92 | """Parse one entry in a mailcap file and return a dictionary.
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| 93 |
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| 94 | The viewing command is stored as the value with the key "view",
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| 95 | and the rest of the fields produce key-value pairs in the dict.
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| 96 | """
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| 97 | fields = []
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| 98 | i, n = 0, len(line)
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