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# Mailcap file handling. See RFC 1524.
import os
import string
import tempfile
# Part 1: top-level interface.
def getcaps():
caps = {}
for mailcap in listmailcapfiles():
try:
fp = open(mailcap, 'r')
except:
continue
morecaps = readmailcapfile(fp)
fp.close()
for key in morecaps.keys():
if not caps.has_key(key):
caps[key] = morecaps[key]
else:
caps[key] = caps[key] + morecaps[key]
return caps
def listmailcapfiles():
# XXX Actually, this is Unix-specific
if os.environ.has_key('MAILCAPS'):
str = os.environ['MAILCAPS']
mailcaps = string.splitfields(str, ':')
else:
if os.environ.has_key('HOME'):
home = os.environ['HOME']
else:
# Don't bother with getpwuid()
home = '.' # Last resort
mailcaps = [home + '/.mailcap', '/etc/mailcap',
'/usr/etc/mailcap', '/usr/local/etc/mailcap']
return mailcaps
# Part 2: the parser.
def readmailcapfile(fp):
caps = {}
while 1:
line = fp.readline()
if not line: break
# Ignore comments and blank lines
if line[0] == '#' or string.strip(line) == '':
continue
nextline = line
# Join continuation lines
while nextline[-2:] == '\\\n':
nextline = fp.readline()
if not nextline: nextline = '\n'
line = line[:-2] + nextline
# Parse the line
key, fields = parseline(line)
if not (key and fields):
continue
# Normalize the key
types = string.splitfields(key, '/')
for j in range(len(types)):
types[j] = string.strip(types[j])
key = string.lower(string.joinfields(types, '/'))
# Update the database
if caps.has_key(key):
caps[key].append(fields)
else:
caps[key] = [fields]
return caps
def parseline(line):
fields = []
i, n = 0, len(line)
while i < n:
field, i = parsefield(line, i, n)
fields.append(field)
i = i+1 # Skip semicolon
if len(fields) < 2:
return None, None
key, view, rest = fields[0], fields[1], fields[2:]
fields = {'view': view}
for field in rest:
i = string.find(field, '=')
if i < 0:
fkey = field
fvalue = ""
else:
fkey = string.strip(field[:i])
fvalue = string.strip(field[i+1:])
if fields.has_key(fkey):
# Ignore it
pass
else:
fields[fkey] = fvalue
return key, fields
def parsefield(line, i, n):
start = i
while i < n:
c = line[i]
if c == ';':
break
elif c == '\\':
i = i+2
else:
i = i+1
return string.strip(line[start:i]), i
# Part 3: using the database.
def findmatch(caps, type, key='view', filename="/dev/null", plist=[]):
entries = lookup(caps, type, key)
for e in entries:
if e.has_key('test'):
test = subst(e['test'], filename, plist)
if test and os.system(test) != 0:
continue
command = subst(e[key], type, filename, plist)
return command, e
return None, None
def lookup(caps, type, key=None):
entries = []
if caps.has_key(type):
entries = entries + caps[type]
types = string.splitfields(type, '/')
type = types[0] + '/*'
if caps.has_key(type):
entries = entries + caps[type]
if key is not None:
entries = filter(lambda e, key=key: e.has_key(key), entries)
return entries
def subst(field, type, filename, plist=[]):
# XXX Actually, this is Unix-specific
res = ''
i, n = 0, len(field)
while i < n:
c = field[i]; i = i+1
if c <> '%':
if c == '\\':
c = field[i:i+1]; i = i+1
res = res + c
else:
c = field[i]; i = i+1
if c == '%':
res = res + c
elif c == 's':
res = res + filename
elif c == 't':
res = res + type
elif c == '{':
start = i
while i < n and field[i] <> '}':
i = i+1
name = field[start:i]
i = i+1
res = res + findparam(name, plist)
# XXX To do:
# %n == number of parts if type is multipart/*
# %F == list of alternating type and filename for parts
else:
res = res + '%' + c
return res
def findparam(name, plist):
name = string.lower(name) + '='
n = len(name)
for p in plist:
if string.lower(p[:n]) == name:
return p[n:]
return ''
# Part 4: test program.
def test():
import sys
caps = getcaps()
if not sys.argv[1:]:
show(caps)
return
for i in range(1, len(sys.argv), 2):
args = sys.argv[i:i+2]
if len(args) < 2:
print "usage: mailcap [type file] ..."
return
type = args[0]
file = args[1]
command, e = findmatch(caps, type, 'view', file)
if not command:
print "No viewer found for", type
else:
print "Executing:", command
sts = os.system(command)
if sts:
print "Exit status:", sts
def show(caps):
print "Mailcap files:"
for fn in listmailcapfiles(): print "\t" + fn
print
if not caps: caps = getcaps()
print "Mailcap entries:"
print
ckeys = caps.keys()
ckeys.sort()
for type in ckeys:
print type
entries = caps[type]
for e in entries:
keys = e.keys()
keys.sort()
for k in keys:
print " %-15s" % k, e[k]
print
if __name__ == '__main__':
test()
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