David Levine wrote:
Ralph wrote:

The aim would be for the existing users to
have a code base that allowed more rapid, stable development of new
features, deprecating old warts, and improving consistency.

+1

I'd rather see more of all the above, even if it means giving up some
current capabilities.  I don't think that should be done with the
current code base.

yikes! wouldn't you just use GNU-Mailutils' version of MH and contribute to that instead? it's more or less exactly what you describe, though with a more onerous license.

in <http://mailutils.org/manual/mailutils.txt>, we see:

3.16 MH -- The MH Message Handling System
=========================================

The primary aim of this implementation is to provide an interface
between Mailutils and Emacs using mh-e module.

   To use Mailutils MH with Emacs, add the following line to your
site-start.el or .emacs file:

   (load "mailutils-mh")

   For the information about the current state of Mailutils MH
implementation please refer to file 'mh/TODO' in the Mailutils
distribution directory.

3.16.1 Major differences between Mailutils MH and other MH implementations
--------------------------------------------------------------------------

  1. UUCP addresses are not supported;

  2. Mailutils supports a set of new format specifications (*note Format
     String Diffs::);

  3. Mailutils provides a set of new profile variables (*note Profile
     Variable Diffs::);

  4. All programs recognize '--help' and '--version' options

     These options are recognized only if no other arguments are present
     in the command line.  Abbreviations are not recognized.  This makes
     Mailutils MH implementation compatible with the standard usage for
     GNU tools.

  5. Several programs behave differently (*note Program Diffs::);

3.16.1.1 New and Differing MH Format Specifications
...................................................

 -- MH Format: string decode (string STR)

     Decodes the input string STR as per RFC 2047.  Useful in printing
     'From:', 'To:' and 'Subject:' headers.

     Notice that, unlike the similar NMH function, 'decode' checks the
     value of the global profile variable 'Charset' (*note Charset
     variable::) to determine the charset to output the result in.  If
     this variable is not set, 'decode' returns its argument without any
     change.  If this variable is set to 'auto', 'decode' tries to
     determine the charset name from the setting of 'LC_ALL' environment
     variable.  Otherwise, the value of 'Charset' is taken to be the
     name of the character set.

 -- MH Format: string package ()

     Returns package name (string 'mailutils').

 -- MH Format: string package_string ()

     Returns full package string (e.g.  'GNU Mailutils 2.1')

 -- MH Format: string version ()

     Returns mailutils version.

 -- MH Format: string unre (string STR)

     The function removes any leading whitespace and eventual 'Re:'
     prefix from its argument.  Useful for creating subjects in reply
     messages:

            %<{subject}Subject: Re: %(unre{subject})\\n%>

 -- MH Format: void reply_regex (string R)

     Sets the regular expression used to recognize reply messages.  The
     argument R should be a POSIX extended regular expression.  Matching
     is case insensitive.

     For example, the following invocation

            %(reply_regex ^\(re|aw|ang|odp\)\(\\[[0-9]+\\]\)?:[[:blank:]])

     corresponds to English 'Re', Polish 'Odp', Norwegian 'Aw' or German
     'Ang', optionally followed by a number in brackets, followed by
     colon and any amount of whitespace.  Notice proper quoting of the
     regex metacharacters.

     See also 'Reply-Regex' (*note Reply-Regex variable::) and 'isreply'
     (*note isreply MH function::) below.

 -- MH Format: boolean isreply ([string STR])

     If STR is not given, the value of 'Subject:' header is taken.

     The function returns true if its argument matches the "reply
     subject" regular expression.  This expression is set via the global
     profile variable 'Reply-Regex' (*note Reply-Regex variable::) or
     via the format function 'reply_regex'.

     This function is useful for creating 'Subject:' headers in reply
     messages.  For example, consider the following construction:

          %<{subject}%(lit)%<(isreply)%?\
          (profile reply-prefix)%(concat)%|%(concat Re:)%>\
          %(concat{subject})%(printhdr Subject: )\n%>

     If the 'Subject:' header already contained reply prefix, this
     construct leaves it unchanged.  Otherwise it prepends to it the
     value of 'Reply-Prefix' profile variable, or, if it is unset, the
     string 'Re:'.

     This expression is used in default 'replcomps' and 'replgroupcomps'
     files.

 -- MH Format: boolean rcpt ('to' | 'cc' | 'me' | 'all')

     This function returns true if the given element is present in the
     recipient mask (as modified by '-cc' or '-nocc' options) and false
     otherwise.  It is used in default formats for 'repl' and 'comp',
     e.g.:

          %(lit)%<(rcpt to)%(formataddr{to})%>

     Notice that this means that usual 'replcomps' file will be ignoring
     '-cc' and '-nocc' options, unless it has been modified as shown
     above.

 -- MH Format: string concat ()

     Appends whitespace + arg to string register.

 -- MH Format: string printhdr (string STR)

     Prints the value of string register, prefixed by STR.  The output
     is formatted as a RFC 822 header, i.e.  it is split at whitespace
     characters nearest to the width boundary and each subsequent
     segment is prefixed with horizontal tabulation.

 -- MH Format: string in_reply_to ()

     Generates the value for 'In-reply-to:' header according to RFC
     2822.

 -- MH Format: string references ()

     Generates the value for 'References:' header according to RFC 2822.

3.16.1.2 New MH Profile Variables
.................................

 -- Variable: MH Variable string Charset

     Controls the character set in which the components decoded via the
     'decode' (*note decode function::) format function should be
     output.

 -- Variable: MH Variable string Reply-Regex

     Keeps the regular expression used to recognize reply messages.  The
     argument should be a POSIX extended regular expression.  Matching
     is case insensitive.

     For more information, please see *Note reply_regex function::.

3.16.1.3 Differences in MH Program Behavior
...........................................

'anno'

     The prompt in interactive mode is 'Component name:', instead of
     'Enter component name:' displayed by the RAND 'anno'.

     If a '-component field' is not specified and standard input is not
     connected to a terminal, 'anno' does not display the prompt before
     reading the component from the standard input.  RAND 'anno'
     displays the prompt anyway.

'burst'

     The utility is able to burst both RFC 934 digest messages and MIME
     multipart messages.  It provides two additional command line
     options: '-recurse' and '-length'.

     The '-recurse' option instructs the utility to recursively expand
     the digest.

     The '-length' option can be used to set the minimal encapsulation
     boundary length for RFC 934 digests.  Default length is 1, i.e.
     encountering one dash immediately following a newline triggers
     digest decoding.  It is OK for messages that follow RFC 934
     specification.  However, many user agents do not precisely follow
     it, in particular, they often do not escape lines starting with a
     dash by '- ' sequence.  'Mailman' is one of such agents.  To cope
     with such digests you can set encapsulation boundary length to a
     higher value.  For example, 'bounce -length 8' has been found to be
     sufficient for most Mailman-generated digests.

'comp'

     Understands '-build' option.

'fmtdump'

     This command is not provided.  Use 'fmtcheck' instead.

'inc'
        * The '-moveto' option.  The '-moveto' option instructs 'inc' to
          move messages into another folder after incorporating them.
          This option has effect only if the '-truncate' option has also
          been specified and the underlying mailbox supports the 'move'
          operation.  Currently only 'imap' and 'imaps' mailboxes
          support it.  For example, the following command moves
          incorporated messages into the 'archive' folder:

               inc -file imaps://imap.gmail.com -moveto=archive

          The 'moveto' URL parameter can be used instead of this option,
          e.g.:

               inc -file 'imaps://imap.gmail.com;moveto=archive'

        * Multiple sources Mailutils 'inc' is able to incorporate
          messages from several source mailboxes.  These are specified
          via multiple '-file' options, e.g.:

               inc  -truncate \
                    -file 'imaps://imap.gmail.com;moveto=archived' \
                    -file pops://mail.gnu.org \
                    -file /var/mail/root

        * URL parameters The following additional parameters can be used
          in the mailbox URLs supplied with the '-file' option:

          'moveto=FOLDER'
               Moves incorporated messages into another folder.  This
               was discussed above.

          'nomoveto'
               Disables the previous '-moveto' option.

          'truncate[=BOOL]'
               Controls source mailbox truncation.  If BOOL is not given
               or it is 'yes', the mailbox will be truncated after
               successful processing.  If BOOL is 'no', the source
               mailbox will not be truncated.

'mhl'

     The 'ignores' keyword can be used in variable list.  In that case,
     if its value contains more than one component name it must be
     enclosed in double-quotes, e.g.:

          leftadjust,compwidth=9,"ignores=msgid,message-id,received"

     The above is equivalent to the following traditional notation:

          leftadjust,compwidth=9
          ignores=msgid,message-id,received

     The 'MessageName' component is not yet implemented.

     Interactive prompting is not yet implemented.

     The following format variables are silently ignored: 'center',
     'split', 'datefield'.

'mhn'

        * New option New option '-compose' forces 'mhn' editing mode.
          This is also the default mode.  This differs from the standard
          'mhn', which switches to the editing mode only if no other
          options were given and the input file name coincides with the
          value of 'mhdraft' environment variable.

        * Show mode ('-show') If an appropriate mhn-show-type[/subtype]
          was not found, GNU 'mhn' prints the decoded message content
          using 'moreproc' variable.  Standard 'mhn' in this case used
          to print 'don't know how to display content' diagnostic.

          The default behaviour is to pipe the content to the standard
          input of the mhn-show-type[/subtype] command.  This is altered
          to using a temporary file if the command contains '%f' or '%F'
          escapes.

        * Store mode ('-store') If the 'Content-Disposition' header
          contains 'filename=', and 'mhn' is invoked with '-auto'
          switch, it transforms the file name into the absolute notation
          and uses it only if it lies below the current mhn-storage
          directory.  Standard 'mhn' only requires that the file name do
          not begin with '/'.

          Before saving a message part, GNU 'mhn' checks if the file
          already exists.  If so, it asks whether the user wishes to
          rewrite it.  This behaviour is disabled when '-quiet' option
          was given.

'mhparam'

     The '-all' mode does not display commented out entries.

'pick'

     New command line option '-cflags' allows to control the type of
     regular expressions used.  The option must occur right before
     '--COMPONENT PATTERN' or equivalent construct (like '-cc', '-from',
     etc.)

     The argument to this option is a string of type specifications:

     B              Use basic regular expressions
     E              Use extended regular expressions
     I              Ignore case
     C              Case sensitive

     Default is 'EI'.

     The flags remain in effect until the next occurrence of '-cflags'
     option.

     Sample usage:

          pick -cflag BC -subject '*a string'

     The date comparison options ('-before' and '-after' accept date
     specifications in a wide variety of formats, e.g.:

          pick -after 20030301
          pick -after 2003-03-01
          pick -after 01-mar-2003
          pick -after 2003-mar-01
          pick -before '1 year ago'
          etc...

'prompter'
       1. Prompter attempts to use GNU Readline library, if it is
          installed.  Consequently, arguments to '-erase' and '-kill'
          option must follow GNU style key sequence notation (*note
          keyseq: (readline)Readline Init File Syntax.).

          If 'prompter' is built without 'readline', it accepts the
          following character notations:

          \NNNN
               Here, N stands for a single octal digit.

          ^CHR
               This notation is translated to the ASCII code 'CHR +
               0100'.

       2. Component continuation lines are not required to begin with a
          whitespace.  If leading whitespace is not present, 'prompter'
          will add it automatically.

'refile'

       1. Linking messages between folders goes against the logic of
          Mailutils, so 'refile' never makes links even if called with
          '-link' option.  The latter is actually a synonym for '-copy',
          which preserves the original message.

       2. The '-preserve' option is not implemented.  It is retained for
          backward compatibility only.

       3. Message specs and folder names may be interspersed.

'repl'

     Understands '-use' option.  Disposition shell provides 'use'
     command.

'rmm'

       1. Different behaviour if one of the messages in the list does
          not exist:

          Mailutils 'rmm' does not delete any messages.  Standard 'rmm'
          in this case deletes all messages preceding the non-existent
          one.

       2. The 'rmm' utility will unlink messages, if the 'rmmproc'
          profile component has empty value, e.g.:

               rmmproc:

'sortm'

     New option '-numfield' specifies numeric comparison for the given
     field.

     Any number of '-datefield', '-textfield' and '-numfield' options
     may be given, thus allowing to build sort criteria of arbitrary
     complexity.

     The order of '-.*field' options sets the ordering priority.  This
     differs from the behaviour of the standard 'sortm', which always
     orders datefield-major, textfield-minor.

     Apart from sorting the mailfolder the following actions may be
     specified:

     '-list'
          List the ordered messages using a format string given by
          '-form' or '-format' option.

     '-dry-run'
          Do not actually sort messages, rather print what would have
          been done.  This is useful for debugging purposes.



--
P Vixie


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