mirror of
https://github.com/python/cpython.git
synced 2024-12-21 07:45:30 +08:00
d57cf55736
mailcap.test() now uses os.waitstatus_to_exitcode() to convert os.system() exit status into an exit code.
277 lines
8.0 KiB
Python
277 lines
8.0 KiB
Python
"""Mailcap file handling. See RFC 1524."""
|
|
|
|
import os
|
|
import warnings
|
|
|
|
__all__ = ["getcaps","findmatch"]
|
|
|
|
|
|
def lineno_sort_key(entry):
|
|
# Sort in ascending order, with unspecified entries at the end
|
|
if 'lineno' in entry:
|
|
return 0, entry['lineno']
|
|
else:
|
|
return 1, 0
|
|
|
|
|
|
# Part 1: top-level interface.
|
|
|
|
def getcaps():
|
|
"""Return a dictionary containing the mailcap database.
|
|
|
|
The dictionary maps a MIME type (in all lowercase, e.g. 'text/plain')
|
|
to a list of dictionaries corresponding to mailcap entries. The list
|
|
collects all the entries for that MIME type from all available mailcap
|
|
files. Each dictionary contains key-value pairs for that MIME type,
|
|
where the viewing command is stored with the key "view".
|
|
|
|
"""
|
|
caps = {}
|
|
lineno = 0
|
|
for mailcap in listmailcapfiles():
|
|
try:
|
|
fp = open(mailcap, 'r')
|
|
except OSError:
|
|
continue
|
|
with fp:
|
|
morecaps, lineno = _readmailcapfile(fp, lineno)
|
|
for key, value in morecaps.items():
|
|
if not key in caps:
|
|
caps[key] = value
|
|
else:
|
|
caps[key] = caps[key] + value
|
|
return caps
|
|
|
|
def listmailcapfiles():
|
|
"""Return a list of all mailcap files found on the system."""
|
|
# This is mostly a Unix thing, but we use the OS path separator anyway
|
|
if 'MAILCAPS' in os.environ:
|
|
pathstr = os.environ['MAILCAPS']
|
|
mailcaps = pathstr.split(os.pathsep)
|
|
else:
|
|
if 'HOME' in os.environ:
|
|
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):
|
|
"""Read a mailcap file and return a dictionary keyed by MIME type."""
|
|
warnings.warn('readmailcapfile is deprecated, use getcaps instead',
|
|
DeprecationWarning, 2)
|
|
caps, _ = _readmailcapfile(fp, None)
|
|
return caps
|
|
|
|
|
|
def _readmailcapfile(fp, lineno):
|
|
"""Read a mailcap file and return a dictionary keyed by MIME type.
|
|
|
|
Each MIME type is mapped to an entry consisting of a list of
|
|
dictionaries; the list will contain more than one such dictionary
|
|
if a given MIME type appears more than once in the mailcap file.
|
|
Each dictionary contains key-value pairs for that MIME type, where
|
|
the viewing command is stored with the key "view".
|
|
"""
|
|
caps = {}
|
|
while 1:
|
|
line = fp.readline()
|
|
if not line: break
|
|
# Ignore comments and blank lines
|
|
if line[0] == '#' or line.strip() == '':
|
|
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
|
|
if lineno is not None:
|
|
fields['lineno'] = lineno
|
|
lineno += 1
|
|
# Normalize the key
|
|
types = key.split('/')
|
|
for j in range(len(types)):
|
|
types[j] = types[j].strip()
|
|
key = '/'.join(types).lower()
|
|
# Update the database
|
|
if key in caps:
|
|
caps[key].append(fields)
|
|
else:
|
|
caps[key] = [fields]
|
|
return caps, lineno
|
|
|
|
def parseline(line):
|
|
"""Parse one entry in a mailcap file and return a dictionary.
|
|
|
|
The viewing command is stored as the value with the key "view",
|
|
and the rest of the fields produce key-value pairs in the dict.
|
|
"""
|
|
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 = field.find('=')
|
|
if i < 0:
|
|
fkey = field
|
|
fvalue = ""
|
|
else:
|
|
fkey = field[:i].strip()
|
|
fvalue = field[i+1:].strip()
|
|
if fkey in fields:
|
|
# Ignore it
|
|
pass
|
|
else:
|
|
fields[fkey] = fvalue
|
|
return key, fields
|
|
|
|
def parsefield(line, i, n):
|
|
"""Separate one key-value pair in a mailcap entry."""
|
|
start = i
|
|
while i < n:
|
|
c = line[i]
|
|
if c == ';':
|
|
break
|
|
elif c == '\\':
|
|
i = i+2
|
|
else:
|
|
i = i+1
|
|
return line[start:i].strip(), i
|
|
|
|
|
|
# Part 3: using the database.
|
|
|
|
def findmatch(caps, MIMEtype, key='view', filename="/dev/null", plist=[]):
|
|
"""Find a match for a mailcap entry.
|
|
|
|
Return a tuple containing the command line, and the mailcap entry
|
|
used; (None, None) if no match is found. This may invoke the
|
|
'test' command of several matching entries before deciding which
|
|
entry to use.
|
|
|
|
"""
|
|
entries = lookup(caps, MIMEtype, key)
|
|
# XXX This code should somehow check for the needsterminal flag.
|
|
for e in entries:
|
|
if 'test' in e:
|
|
test = subst(e['test'], filename, plist)
|
|
if test and os.system(test) != 0:
|
|
continue
|
|
command = subst(e[key], MIMEtype, filename, plist)
|
|
return command, e
|
|
return None, None
|
|
|
|
def lookup(caps, MIMEtype, key=None):
|
|
entries = []
|
|
if MIMEtype in caps:
|
|
entries = entries + caps[MIMEtype]
|
|
MIMEtypes = MIMEtype.split('/')
|
|
MIMEtype = MIMEtypes[0] + '/*'
|
|
if MIMEtype in caps:
|
|
entries = entries + caps[MIMEtype]
|
|
if key is not None:
|
|
entries = [e for e in entries if key in e]
|
|
entries = sorted(entries, key=lineno_sort_key)
|
|
return entries
|
|
|
|
def subst(field, MIMEtype, 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 + MIMEtype
|
|
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 = name.lower() + '='
|
|
n = len(name)
|
|
for p in plist:
|
|
if p[:n].lower() == 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 [MIMEtype file] ...")
|
|
return
|
|
MIMEtype = args[0]
|
|
file = args[1]
|
|
command, e = findmatch(caps, MIMEtype, 'view', file)
|
|
if not command:
|
|
print("No viewer found for", type)
|
|
else:
|
|
print("Executing:", command)
|
|
sts = os.system(command)
|
|
sts = os.waitstatus_to_exitcode(sts)
|
|
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 = sorted(caps)
|
|
for type in ckeys:
|
|
print(type)
|
|
entries = caps[type]
|
|
for e in entries:
|
|
keys = sorted(e)
|
|
for k in keys:
|
|
print(" %-15s" % k, e[k])
|
|
print()
|
|
|
|
if __name__ == '__main__':
|
|
test()
|