Mercurial > cpython-lru_cache-weakref

annotate Lib/mailcap.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents dbee2f628a90
children 4cdf21a0dbbc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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99 while i < n:
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100 field, i = parsefield(line, i, n)
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101 fields.append(field)
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102 i = i+1 # Skip semicolon
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103 if len(fields) < 2:
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104 return None, None
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105 key, view, rest = fields[0], fields[1], fields[2:]
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106 fields = {'view': view}
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107 for field in rest:
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108 i = field.find('=')
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109 if i < 0:
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110 fkey = field
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111 fvalue = ""
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112 else:
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113 fkey = field[:i].strip()
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114 fvalue = field[i+1:].strip()
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115 if fkey in fields:
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116 # Ignore it
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117 pass
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118 else:
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119 fields[fkey] = fvalue
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120 return key, fields
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121
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122 def parsefield(line, i, n):
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123 """Separate one key-value pair in a mailcap entry."""
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124 start = i
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125 while i < n:
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126 c = line[i]
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127 if c == ';':
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128 break
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129 elif c == '\\':
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130 i = i+2
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131 else:
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132 i = i+1
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133 return line[start:i].strip(), i
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134
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135
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136 # Part 3: using the database.
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137
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138 def findmatch(caps, MIMEtype, key='view', filename="/dev/null", plist=[]):
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139 """Find a match for a mailcap entry.
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140
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141 Return a tuple containing the command line, and the mailcap entry
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142 used; (None, None) if no match is found. This may invoke the
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143 'test' command of several matching entries before deciding which
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144 entry to use.
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145
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146 """
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147 entries = lookup(caps, MIMEtype, key)
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148 # XXX This code should somehow check for the needsterminal flag.
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149 for e in entries:
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150 if 'test' in e:
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151 test = subst(e['test'], filename, plist)
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152 if test and os.system(test) != 0:
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153 continue
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154 command = subst(e[key], MIMEtype, filename, plist)
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155 return command, e
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156 return None, None
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157
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158 def lookup(caps, MIMEtype, key=None):
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159 entries = []
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160 if MIMEtype in caps:
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161 entries = entries + caps[MIMEtype]
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162 MIMEtypes = MIMEtype.split('/')
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163 MIMEtype = MIMEtypes[0] + '/*'
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164 if MIMEtype in caps:
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165 entries = entries + caps[MIMEtype]
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166 if key is not None:
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167 entries = filter(lambda e, key=key: key in e, entries)
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168 return entries
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169
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170 def subst(field, MIMEtype, filename, plist=[]):
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171 # XXX Actually, this is Unix-specific
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172 res = ''
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173 i, n = 0, len(field)
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174 while i < n:
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175 c = field[i]; i = i+1
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176 if c != '%':
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177 if c == '\\':
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178 c = field[i:i+1]; i = i+1
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179 res = res + c
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180 else:
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181 c = field[i]; i = i+1
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182 if c == '%':
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183 res = res + c
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184 elif c == 's':
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185 res = res + filename
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186 elif c == 't':
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187 res = res + MIMEtype
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188 elif c == '{':
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189 start = i
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190 while i < n and field[i] != '}':
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191 i = i+1
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192 name = field[start:i]
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193 i = i+1
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194 res = res + findparam(name, plist)
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195 # XXX To do:
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196 # %n == number of parts if type is multipart/*
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197 # %F == list of alternating type and filename for parts
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198 else:
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199 res = res + '%' + c
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200 return res
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201
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202 def findparam(name, plist):
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203 name = name.lower() + '='
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204 n = len(name)
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205 for p in plist:
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206 if p[:n].lower() == name:
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207 return p[n:]
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208 return ''
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209
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210
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211 # Part 4: test program.
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212
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213 def test():
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214 import sys
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215 caps = getcaps()
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216 if not sys.argv[1:]:
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217 show(caps)
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218 return
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219 for i in range(1, len(sys.argv), 2):
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220 args = sys.argv[i:i+2]
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221 if len(args) < 2:
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222 print "usage: mailcap [MIMEtype file] ..."
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223 return
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224 MIMEtype = args[0]
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225 file = args[1]
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226 command, e = findmatch(caps, MIMEtype, 'view', file)
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227 if not command:
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228 print "No viewer found for", type
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229 else:
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230 print "Executing:", command
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231 sts = os.system(command)
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232 if sts:
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233 print "Exit status:", sts
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234
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235 def show(caps):
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236 print "Mailcap files:"
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237 for fn in listmailcapfiles(): print "\t" + fn
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238 print
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239 if not caps: caps = getcaps()
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240 print "Mailcap entries:"
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241 print
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242 ckeys = caps.keys()
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243 ckeys.sort()
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244 for type in ckeys:
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245 print type
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246 entries = caps[type]
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247 for e in entries:
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248 keys = e.keys()
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249 keys.sort()
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250 for k in keys:
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251 print " %-15s" % k, e[k]
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252 print
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253
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254 if __name__ == '__main__':
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255 test()