/usr/bin/mailplate is in mailplate 0.2-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# -*- coding: utf-8 -*-
#
# mailplate — reformat mail drafts according to templates
#
# Please see the mailplate(1) manpage or the homepage for more information:
# http://madduck.net/code/mailplate/
#
# TODO: if headers like From are absent from the mail, they should not be kept
# but replaced with a default.
#
# Copyright © martin f. krafft <madduck@madduck.net>
# Released under the terms of the Artistic Licence 2.0
#
__name__ = 'mailplate'
__description__ = 'reformat mail drafts according to templates'
__version__ = '0.1'
__author__ = 'martin f. krafft <madduck@madduck.net>'
__copyright__ = 'Copyright © ' + __author__
__licence__ = 'Artistic Licence 2.0'
import email
import os
import posix
import re
import sys
import subprocess
import ConfigParser
from optparse import OptionParser
###
### CONSTANTS
###
MAILPLATEDIR = '~/.mailplate' # settings directory
CONFFILE = MAILPLATEDIR + '/config' # configuration file
SECTION_GENERAL = 'general' # name of general config section
SECTION_HELPERS = 'helpers' # name of helpers config section
TEMPLATEDIR = MAILPLATEDIR + '/templates' # location of templates
COMMENTCHAR = '#' # character commencing a comment line in the template
REGEXPCHAR = '*' # character commencing a regexp line in the template
COMMANDCHAR = '!' # character commencing a command line in the template
KEEP_SLOT_LEADER = '@' # character commencing a keep slot
ENV_SLOT_LEADER = '${' # character commencing an environment variable slot
ENV_SLOT_TRAILER = '}' # character ending an environment variable slot
HELPER_SLOT_LEADER = '$(' # character commencing a helper slot
HELPER_SLOT_TRAILER = ')' # character ending a helper slot
# headers we want to preserve most of the time, and their order
STD_HEADERS = ('From', 'To', 'Cc', 'Bcc', 'Subject', 'Reply-To', 'In-Reply-To')
KEEP_HEADERS = { 'KEEP_FROM_HEADER' : STD_HEADERS[:1]
, 'KEEP_STD_HEADERS' : STD_HEADERS[1:]
, 'KEEP_ALL_HEADERS' : STD_HEADERS
}
SIG_DELIM='\n-- \n'
###
### HELPER FUNCTION DEFINITIONS
###
def err(s):
sys.stderr.write('E: ' + s + '\n')
def warn(s):
sys.stderr.write('W: ' + s + '\n')
def info(s):
if not options.verbose: return
sys.stderr.write('I: ' + s + '\n')
# obtain a regexp from a line, run it, return score/dict if matched
def exec_regexp(line, rawmsg, name):
p, r = line[1:].strip().split(' ', 1)
m = re.compile(r, re.M | re.I | re.U).search(rawmsg)
if m is not None:
return (int(p), m.groupdict())
return (0, {})
# obtain a command from a line, run it, return score if matched
def exec_command(line, rawmsg, name):
p, r = line[1:].strip().split(' ', 1)
s = subprocess.Popen(r, shell=True, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
try:
stdout, stderr = s.communicate(rawmsg)
if s.returncode == 0:
return int(p)
else:
return 0
except OSError:
warn("command '%s' (template '%s') failed to run." % (r, name))
return 0
def interpolate_helpers(s):
while True:
helper_begin = s.find(HELPER_SLOT_LEADER)
if helper_begin < 0: break
helper_end = s.find(HELPER_SLOT_TRAILER, helper_begin)
helper = s[helper_begin + len(HELPER_SLOT_LEADER):helper_end]
try:
proc = subprocess.Popen(helpers[helper], shell=True,
stdout=subprocess.PIPE, stderr=sys.stderr)
out = proc.communicate()[0]
s = s[:helper_begin] + out.strip() + s[helper_end+1:]
except KeyError:
err('unknown helper: ' + helper)
sys.exit(posix.EX_DATAERR)
return s
def interpolate_env(s):
while True:
envvar_begin = s.find(ENV_SLOT_LEADER)
if envvar_begin < 0: break
envvar_end = s.find(ENV_SLOT_TRAILER, envvar_begin)
envvar = s[envvar_begin + len(ENV_SLOT_LEADER):envvar_end]
value = os.getenv(envvar) or ''
s = s[:envvar_begin] + value + s[envvar_end+1:]
return s
def interpolate_vars(s):
return s % vars
def interpolate(s):
return interpolate_helpers(interpolate_env(interpolate_vars(s)))
# sentinel to use as dict value for preserved headers
class _keep_header: pass
###
### VARIABLE INITIALISATION
###
infname = None
inf = sys.stdin
outfname = None
outf = sys.stdout
templname = None
templ = None
vars = {}
headers = {}
payload = None
###
### COMMAND LINE PARSING
###
parser = OptionParser()
parser.prog = __name__
parser.version = __version__
parser.description = __description__
parser.usage = '%prog [options] <message>'
parser.add_option('-a', '--auto', dest='auto',
default=False, action='store_true',
help='turn on template auto-discovery')
parser.add_option('-m', '--menu', dest='menu',
default=False, action='store_true',
help='choose from a list of templates (not yet implemented)')
parser.add_option('-n', '--new', dest='new',
default=False, action='store_true',
help='create a new message')
parser.add_option('-e', '--editor', dest='edit',
default=False, action='store_true',
help='spawn editor once template is applied')
parser.add_option('-k', '--keep-unknown', dest='keep_unknown',
default=False, action='store_true',
help='preserve mail headers not specified in template')
parser.add_option('-v', '--verbose', dest='verbose',
default=False, action='store_true',
help='write informational messages to stderr')
parser.add_option('-d', '--debug', dest='debug',
default=False, action='store_true',
help='start a debugger after initialisation')
parser.add_option('-V', '--version', dest='version',
default=False, action='store_true',
help='display version information')
options, args = parser.parse_args()
if options.version:
print __name__, __version__ + ' — ' + __description__
print
print 'Written by ' + __author__
print __copyright__
print 'Released under the ' + __licence__
sys.exit(posix.EX_OK)
###
### CONFIGURATION FILE PARSING
###
CONFFILE = os.path.expanduser(CONFFILE)
MAILPLATEDIR = os.path.expanduser(MAILPLATEDIR)
# defaults
config = { 'default_template' : 'default'
, 'template_path' : TEMPLATEDIR
}
helpers = { 'get_quote' : 'fortune -s' }
if not os.path.exists(CONFFILE):
# conffile does not exist, let's create it with defaults.
options.verbose = True
if not os.path.isdir(MAILPLATEDIR):
info('configuration directory not found, creating: ' + MAILPLATEDIR)
os.mkdir(MAILPLATEDIR, 0700)
if not os.path.isfile(CONFFILE):
info('creating a default configuration file: ' + CONFFILE)
f = file(CONFFILE, 'w')
f.write('# mailplate configuration\n[%s]\n' % SECTION_GENERAL)
for kvpair in config.iteritems():
if len(kvpair[1]) > 0:
f.write('%s = %s\n' % kvpair)
if len(helpers) > 0:
f.write('\n[%s]\n' % SECTION_HELPERS)
for kvpair in helpers.iteritems():
f.write('%s = %s\n' % kvpair)
f.close()
if not os.access(CONFFILE, os.R_OK):
err('cannot read configuration file: %s' % CONFFILE)
sys.exit(posix.EX_OSFILE)
# now parse
parser = ConfigParser.SafeConfigParser()
parser.read(CONFFILE)
# first the GENERAL section into the config dict for all keys with defaults
for key in config.keys():
try:
config[key] = parser.get(SECTION_GENERAL, key)
except ConfigParser.NoSectionError, ConfigParser.MissingSectionHeaderError:
err("no section '%s' in %s" % (SECTION_GENERAL, CONFFILE))
sys.exit(posix.EX_CONFIG)
except ConfigParser.NoOptionError:
continue
except ConfigParser.DuplicateSectionError, ConfigParser.ParseError:
err('parse error on %s' % CONFFILE)
sys.exit(posix.EX_CONFIG)
# all HELPERS into the helpers dict
helpers.update(parser.items(SECTION_HELPERS))
TPATH = os.path.expanduser(config['template_path'])
if not os.path.isdir(TPATH):
info('creating template directory: ' + TPATH)
os.mkdir(TPATH, 0700)
default_templname = config['default_template']
if default_templname is not None:
default_templpath = os.path.join(TPATH, default_templname)
if not os.path.isfile(default_templpath):
info('creating the default template: ' + default_templpath)
f = file(default_templpath, 'w')
f.write('@KEEP_STD_HEADERS\n\n@KEEP_BODY\n')
f.close()
if options.debug:
import pdb
pdb.set_trace()
# parse the arguments
for arg in args:
if arg == '-':
infname = arg
outfname = arg
elif arg.find(os.path.sep) == -1 and os.access(os.path.join(TPATH, arg), os.R_OK):
if templname is not None:
err("template already specified (%s), unsure what to do with '%s'"
% (templname, arg))
sys.exit(posix.EX_USAGE)
# argument references an existing template
templname = arg
elif os.path.isfile(arg):
if infname is not None:
err("input file already specified (%s), unsure what to do with '%s'"
% (infname, arg))
sys.exit(posix.EX_USAGE)
# the file exists, so use it as in/out if read/writeable
if os.access(arg, os.R_OK):
infname = arg
if os.access(arg, os.W_OK):
outfname = arg
else:
err('unknown argument: %s' % arg)
sys.exit(posix.EX_USAGE)
# sanity checks
if options.auto and options.menu:
err('cannot combine --auto and --menu')
sys.exit(posix.EX_USAGE)
elif (options.auto or options.menu) and templname:
err('cannot specify a template with --auto or --menu')
sys.exit(posix.EX_USAGE)
elif not templname and not (options.auto or options.menu):
if default_templname is not None:
templname = default_templname
else:
err('no template specified')
sys.exit(posix.EX_USAGE)
elif options.menu:
err('--menu mode not yet implemented')
sys.exit(posix.EX_USAGE)
###
### MAIL PROCESSING
###
# read in the message from a file, if a filename is given.
if infname is not None:
inf = file(infname, 'r', 1)
# read message into buffer, or preinitialise the buffer if --new is given
if options.new:
rawmsg = '\n'.join((header + ': ' for header in STD_HEADERS)) + '\n'
else:
rawmsg = ''.join(inf.readlines())
if options.auto:
best_score = (0, default_templname, {})
for tf in os.listdir(TPATH):
tp = os.path.join(TPATH, tf)
if not os.path.isfile(tp) or not os.access(tp, os.R_OK): continue
# we're iterating all files in the template directory
# for each file, obtain and run regexps and commands and accumulate
# the score (and variables)
score = 0
vars = {}
f = open(tp, 'r')
for line in f:
if line[0] == REGEXPCHAR:
r = exec_regexp(line, rawmsg, tf)
score += r[0]
vars.update(r[1])
elif line[0] == COMMANDCHAR:
score += exec_command(line, rawmsg, tf)
# do we top the currently best score, if so then raise the bar
if score > best_score[0]:
best_score = (score, tf, vars)
templname = best_score[1]
if templname is None:
err('could not determine a template to use and no default is set')
sys.exit(posix.EX_CONFIG)
info('chose profile %s with score %d.' % (templname, best_score[0]))
vars = best_score[2]
# now read in the template
templpath = os.path.join(TPATH, templname)
if not os.path.isfile(templpath):
err('not a template: ' + templpath)
sys.exit(posix.EX_OSFILE)
elif not os.access(templpath, os.R_OK):
err('template ' + templpath + ' could not be read.')
sys.exit(posix.EX_OSFILE)
templ = file(templpath, 'r', 1)
for line in templ:
if not options.auto and line[0] == REGEXPCHAR:
# obtain variables from the regexps
vars.update(exec_regexp(line, rawmsg, templname)[1])
if line[0] in (COMMENTCHAR, REGEXPCHAR, COMMANDCHAR):
continue
elif payload is not None:
# we're past the headers, so accumulate the payload
payload += line
else:
#TODO multiline headers
l = line[:-1]
if len(l) == 0:
payload = '' # end of headers
elif l[0] == KEEP_SLOT_LEADER:
if KEEP_HEADERS.has_key(l[1:]):
# found predefined header slot keyword
for header in KEEP_HEADERS[l[1:]]:
headers[header.lower()] = (header, _keep_header)
else:
err('unknown header slot ' + l + ' found')
sys.exit(posix.EX_CONFIG)
else:
header, content = l.split(':', 1)
content = content.strip()
if content == KEEP_SLOT_LEADER + 'KEEP':
# record header to be preserved
content = _keep_header
else:
content = interpolate(content)
headers[header.lower()] = (header, content)
msg = email.message_from_string(rawmsg)
for header, content in msg.items():
# iterate all existing mail headers
lheader = header.lower()
if headers.has_key(lheader):
# the template defines this header
if headers[lheader][1] == _keep_header:
# it's marked as keep, thus use content from email message
headers[lheader] = (header, content)
elif options.keep_unknown:
# the template does not define the header, but --keep-unknown was
# given, thus preserve the entire header field
headers[lheader] = (header, content)
# open the output file
if outfname is not None:
outf = file(outfname, 'w', 0)
# print the headers, starting with the standard headers in order
for header in STD_HEADERS:
lheader = header.lower()
if headers.get(lheader, (None, _keep_header))[1] is not _keep_header:
# the template header contains mandatory data, let's print it.
hpair = headers[lheader]
print >>outf, ': '.join(hpair)
# and remove it from the dict
del headers[lheader]
for i, (header, content) in headers.iteritems():
# print all remaining headers
if content == _keep_header: continue
print >>outf, ': '.join((header, content))
# print empty line to indicate end of headers.
print >>outf
# split payload of existing message into body and signature
body = msg.get_payload().rsplit(SIG_DELIM, 1)
signature = ''
if len(body) == 1:
body = body[0]
elif len(body) > 1:
signature = body[-1]
body = SIG_DELIM.join(body[:-1]).strip()
# signature may now be ''
# interpolate the template payload
payload = interpolate(payload)
# determine whether to interpolate the signature *before* inserting the body
# to prevent text in the body from being interpolated
keep_sig = payload.find('@KEEP_SIGNATURE') >= 0
# interpolate body and signature
payload = payload.replace('@KEEP_BODY', body, 1)
if keep_sig:
payload = payload.replace('@KEEP_SIGNATURE', signature, 1)
print >>outf, payload.rstrip()
outf.close()
if options.edit:
# finally, spawn the editor, if we wrote into a file
if outfname is None:
err('cannot use --edit without an output file.')
sys.exit(posix.EX_USAGE)
os.execlp('sensible-editor', 'sensible-editor', outfname)
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