Guido van Rossum | 8988fb2 | 1995-09-30 16:52:24 +0000 | [diff] [blame] | 1 | # Mailcap file handling. See RFC 1524. |
| 2 | |
| 3 | import os |
| 4 | import string |
| 5 | import tempfile |
| 6 | |
| 7 | |
| 8 | # Part 1: top-level interface. |
| 9 | |
| 10 | def getcaps(): |
| 11 | caps = {} |
| 12 | for mailcap in listmailcapfiles(): |
| 13 | try: |
| 14 | fp = open(mailcap, 'r') |
| 15 | except: |
| 16 | continue |
| 17 | morecaps = readmailcapfile(fp) |
| 18 | fp.close() |
| 19 | for key in morecaps.keys(): |
| 20 | if not caps.has_key(key): |
| 21 | caps[key] = morecaps[key] |
| 22 | else: |
| 23 | caps[key] = caps[key] + morecaps[key] |
| 24 | return caps |
| 25 | |
| 26 | def listmailcapfiles(): |
| 27 | # XXX Actually, this is Unix-specific |
| 28 | if os.environ.has_key('MAILCAPS'): |
| 29 | str = os.environ['MAILCAPS'] |
| 30 | mailcaps = string.splitfields(str, ':') |
| 31 | else: |
| 32 | if os.environ.has_key('HOME'): |
| 33 | home = os.environ['HOME'] |
| 34 | else: |
| 35 | # Don't bother with getpwuid() |
| 36 | home = '.' # Last resort |
| 37 | mailcaps = [home + '/.mailcap', '/etc/mailcap', |
| 38 | '/usr/etc/mailcap', '/usr/local/etc/mailcap'] |
| 39 | return mailcaps |
| 40 | |
| 41 | |
| 42 | # Part 2: the parser. |
| 43 | |
| 44 | def readmailcapfile(fp): |
| 45 | caps = {} |
| 46 | while 1: |
| 47 | line = fp.readline() |
| 48 | if not line: break |
| 49 | # Ignore comments and blank lines |
| 50 | if line[0] == '#' or string.strip(line) == '': |
| 51 | continue |
| 52 | nextline = line |
| 53 | # Join continuation lines |
| 54 | while nextline[-2:] == '\\\n': |
| 55 | nextline = fp.readline() |
| 56 | if not nextline: nextline = '\n' |
| 57 | line = line[:-2] + nextline |
| 58 | # Parse the line |
| 59 | key, fields = parseline(line) |
| 60 | if not (key and fields): |
Guido van Rossum | cfd8935 | 1996-08-26 16:20:31 +0000 | [diff] [blame^] | 61 | continue |
Guido van Rossum | 8988fb2 | 1995-09-30 16:52:24 +0000 | [diff] [blame] | 62 | # Normalize the key |
| 63 | types = string.splitfields(key, '/') |
| 64 | for j in range(len(types)): |
| 65 | types[j] = string.strip(types[j]) |
| 66 | key = string.lower(string.joinfields(types, '/')) |
| 67 | # Update the database |
| 68 | if caps.has_key(key): |
| 69 | caps[key].append(fields) |
| 70 | else: |
| 71 | caps[key] = [fields] |
| 72 | return caps |
| 73 | |
| 74 | def parseline(line): |
| 75 | fields = [] |
| 76 | i, n = 0, len(line) |
| 77 | while i < n: |
| 78 | field, i = parsefield(line, i, n) |
| 79 | fields.append(field) |
| 80 | i = i+1 # Skip semicolon |
| 81 | if len(fields) < 2: |
| 82 | return None, None |
| 83 | key, view, rest = fields[0], fields[1], fields[2:] |
| 84 | fields = {'view': view} |
| 85 | for field in rest: |
| 86 | i = string.find(field, '=') |
| 87 | if i < 0: |
| 88 | fkey = field |
| 89 | fvalue = "" |
| 90 | else: |
| 91 | fkey = string.strip(field[:i]) |
| 92 | fvalue = string.strip(field[i+1:]) |
| 93 | if fields.has_key(fkey): |
| 94 | # Ignore it |
| 95 | pass |
| 96 | else: |
| 97 | fields[fkey] = fvalue |
| 98 | return key, fields |
| 99 | |
| 100 | def parsefield(line, i, n): |
| 101 | start = i |
| 102 | while i < n: |
| 103 | c = line[i] |
| 104 | if c == ';': |
| 105 | break |
| 106 | elif c == '\\': |
| 107 | i = i+2 |
| 108 | else: |
| 109 | i = i+1 |
| 110 | return string.strip(line[start:i]), i |
| 111 | |
| 112 | |
| 113 | # Part 3: using the database. |
| 114 | |
| 115 | def findmatch(caps, type, key='view', filename="/dev/null", plist=[]): |
| 116 | entries = lookup(caps, type, key) |
| 117 | for e in entries: |
| 118 | if e.has_key('test'): |
| 119 | test = subst(e['test'], filename, plist) |
| 120 | if test and os.system(test) != 0: |
| 121 | continue |
| 122 | command = subst(e[key], type, filename, plist) |
| 123 | return command, e |
| 124 | return None, None |
| 125 | |
| 126 | def lookup(caps, type, key=None): |
| 127 | entries = [] |
| 128 | if caps.has_key(type): |
| 129 | entries = entries + caps[type] |
| 130 | types = string.splitfields(type, '/') |
| 131 | type = types[0] + '/*' |
| 132 | if caps.has_key(type): |
| 133 | entries = entries + caps[type] |
| 134 | if key is not None: |
| 135 | entries = filter(lambda e, key=key: e.has_key(key), entries) |
| 136 | return entries |
| 137 | |
| 138 | def subst(field, type, filename, plist=[]): |
| 139 | # XXX Actually, this is Unix-specific |
| 140 | res = '' |
| 141 | i, n = 0, len(field) |
| 142 | while i < n: |
| 143 | c = field[i]; i = i+1 |
| 144 | if c <> '%': |
| 145 | if c == '\\': |
| 146 | c = field[i:i+1]; i = i+1 |
| 147 | res = res + c |
| 148 | else: |
| 149 | c = field[i]; i = i+1 |
| 150 | if c == '%': |
| 151 | res = res + c |
| 152 | elif c == 's': |
| 153 | res = res + filename |
| 154 | elif c == 't': |
| 155 | res = res + type |
| 156 | elif c == '{': |
| 157 | start = i |
| 158 | while i < n and field[i] <> '}': |
| 159 | i = i+1 |
| 160 | name = field[start:i] |
| 161 | i = i+1 |
| 162 | res = res + findparam(name, plist) |
| 163 | # XXX To do: |
| 164 | # %n == number of parts if type is multipart/* |
| 165 | # %F == list of alternating type and filename for parts |
| 166 | else: |
| 167 | res = res + '%' + c |
| 168 | return res |
| 169 | |
| 170 | def findparam(name, plist): |
| 171 | name = string.lower(name) + '=' |
| 172 | n = len(name) |
| 173 | for p in plist: |
| 174 | if string.lower(p[:n]) == name: |
| 175 | return p[n:] |
| 176 | return '' |
| 177 | |
| 178 | |
| 179 | # Part 4: test program. |
| 180 | |
| 181 | def test(): |
| 182 | import sys |
| 183 | caps = getcaps() |
| 184 | if not sys.argv[1:]: |
| 185 | show(caps) |
| 186 | return |
| 187 | for i in range(1, len(sys.argv), 2): |
| 188 | args = sys.argv[i:i+2] |
| 189 | if len(args) < 2: |
| 190 | print "usage: mailcap [type file] ..." |
| 191 | return |
| 192 | type = args[0] |
| 193 | file = args[1] |
| 194 | command, e = findmatch(caps, type, 'view', file) |
| 195 | if not command: |
| 196 | print "No viewer found for", type |
| 197 | else: |
| 198 | print "Executing:", command |
| 199 | sts = os.system(command) |
| 200 | if sts: |
| 201 | print "Exit status:", sts |
| 202 | |
| 203 | def show(caps): |
| 204 | print "Mailcap files:" |
| 205 | for fn in listmailcapfiles(): print "\t" + fn |
| 206 | print |
| 207 | if not caps: caps = getcaps() |
| 208 | print "Mailcap entries:" |
| 209 | print |
| 210 | ckeys = caps.keys() |
| 211 | ckeys.sort() |
| 212 | for type in ckeys: |
| 213 | print type |
| 214 | entries = caps[type] |
| 215 | for e in entries: |
| 216 | keys = e.keys() |
| 217 | keys.sort() |
| 218 | for k in keys: |
| 219 | print " %-15s" % k, e[k] |
| 220 | print |
| 221 | |
| 222 | if __name__ == '__main__': |
| 223 | test() |