The primary idea is to prefix all vars with a common category name while also renaming some main names.

Secondarily, add "use_" for all editable vars/ optional features (example: use_from, use_my_hdr). Add "_cmd" suffix for all external programs being called.

However, some existing vars already have a proper prefix matching their category. In the case that some vars a properly prefixed (and others are not), assume the prefixed ones will NOT get an additional prefix, there will be only 1 prefix.

Example: "attach_split" won't become "attach_attach_split", even though it isn't explicitly marked for a rename to "split" only, and then again to be prefixed with "attach" for the whole category.

• Add any missing vars.
• Integrate new vars in the "new" section from 1.5.15-1.5.19~tip.
• Add/integrate new vars >1.5.19~tip as they come out.
• For the above, create new sections as necessary and keep the version numbers up to date.
• Move variables around the sections if you find a better place.
• If you suggest a name change like "spoolfile" -> "inbox", then add the new name in "()" after the original entry.

---

system
        alias_file
        check_new (new_while_open)
        dotlock_program (dotlock_cmd)
        editor (editor_cmd)
        locale (time_locale)
        mail_check (newmail_mintime)
        mh_purge
        mh_seq_flagged
        mh_seq_replied
        mh_seq_unseen
        query_command (query_cmd)
        shell
        tmpdir
        timeout (newmail_maxtime)
        header_cache
        maildir_header_cache_verify (header_cache_maildir_verify)
        header_cache_pagesize
        message_cachedir
        spam_separator
        use_ipv6

sendmail
        dsn_notify
        dsn_return
        envelope_from_address
        envelope_from (use_envelope_from) (-> renamed in dev, old has become syn)
        use_envelope_from
        sendmail (sendmail_cmd)
        sendmail_wait (wait)

folder
        folder (base, collection)
        spoolfile (inbox)
        mbox_type (create_type)
        confirmappend
        confirmcreate
        delete
        maildir_trash
        mbox (received)
        move (move_read)
        keep_flagged
        postponed
        read_only
        save_empty (keep_empty)
        copy (use_sent)
        record (sent)
        force_name
        save_address
        save_name
        write_bcc

menu
        arrow_cursor
        ascii_chars
        braille_friendly
        help
        mask (file_mask)
        menu_context (menu_indicator_margin)
        menu_move_off
        menu_scroll
        sleep_time
        sort_browser
        sort_alias
        status_on_top
        wait_key

format (replace all suffixes with prefix)
        alias_format (alias)
        attach_format (attach)
        compose_format (compose)
        date_format (date)
        folder_format (folder)
        index_format (index)
        hdr_format (index)
        message_format (message)
        msg_format (message)
        pager_format (pager)
        status_format (status)

index
        mark_old (mark_unread)
        read_inc
        reverse_alias
        score
        score_threshold_delete
        score_threshold_flag
        score_threshold_read
        sort
        status_chars
        to_chars
        write_inc

pager
        allow_ansi
        display_filter
        implicit_autoview (inline_autoview)
        markers
        pager (ext_cmd)
        pager_context
        pager_index_lines
        pager_stop
        prompt_after
        quote_regexp
        smart_wrap
        smileys
        tilde
        weed
        wrap_search
        wrapmargin

header
        followup_to
        forward_format
        forw_format (forward_format)
        from
        gecos_mask
        hdrs (use_my_hdr)
        hidden_host
        hostname
        realname
        reply_regexp (-> make it 1st, last, only _documented_ synonym for thread_)
        reverse_name
        reverse_realname
        use_domain (use_hostname)
        use_from
        user_agent

body
        attribution
        content_type
        encode_from
        forward_quote
        forw_quote (forward_quote)
        indent_string
        indent_str (indent_string)
        post_indent_string (post_quote)
        post_indent_str (post_quote)
        sig_dashes
        signature
        text_flowed

compose
        abort_nosubject
        abort_unmodified
        askbcc
        askcc
        autoedit
        bounce
        bounce_delivered
        edit_headers
        edit_hdrs (edit_headers)
        fast_reply
        forward_edit
        header (include_header)
        honor_followup_to (use_followup_to)
        ignore_list_reply_to
        include (include_body)
        metoo
        postpone
        recall
        reply_self
        reply_to

thread
        collapse_unread
        duplicate_threads (duplicates)
        hide_limited
        hide_missing
        hide_thread_subject (hide_subject)
        hide_top_limited
        hide_top_missing
        narrow_tree
        reply_regexp (-> make it 1st, last, only _documented_ synonym with header_)
        sort_aux (sort)
        sort_re (partial_re)
        strict_threads (strict)
        thread_received (date_received : isn't this covered by sort_aux?)
        uncollapse_jump

attach
        attach_sep (separator)
        attach_split
        digest_collapse
        fcc_attach (fcc)
        forward_decode
        forw_decode (forward_decode)
        include_onlyfirst
        mailcap_path
        mailcap_sanitize
        mime_forward
        mime_fwd (mime_forward)
        mime_forward_decode
        mime_forward_rest
        pipe_decode
        print_decode
        thorough_search (search_decode)
        rfc2047_parameters

action
        auto_tag
        delete_untag
        quit
        resolve (goto_next)
        suspend
        pipe_sep (pipe_separator)
        pipe_split
        print
        print_command (print_cmd)
        print_cmd (print_cmd)
        print_split
        simple_search

charset
        allow_8bit
        charset (display)
        config_charset (configfile)
        send_charset (send)
        use_8bitmime
        use_idn

crypt
        crypt_autoencrypt
        pgp_autoencrypt (crypt_autoencrypt)
        crypt_autopgp
        crypt_autosign
        pgp_autosign (crypt_autosign)
        crypt_autosmime
        crypt_replyencrypt
        pgp_replyencrypt (crypt_replyencrypt)
        crypt_replysign
        pgp_replysign (crypt_replysign)
        crypt_replysignencrypted (crypt_replysignencrypt)
        pgp_replysignencrypted (crypt_replysignencrypt)
        crypt_timestamp
        crypt_use_gpgme
        crypt_verify_sig
        pgp_verify_sig (crypt_verify_sig)
        fcc_clear
        forward_decrypt
        forw_decrypt (forward_decrypt)
        smime_is_default

pgp
        pgp_check_exit
        pgp_entry_format
        pgp_good_sign
        pgp_ignore_subkeys
        pgp_long_ids
        pgp_retainable_sigs
        pgp_show_unusable
        pgp_sign_as
        pgp_sort_keys
        pgp_strict_enc
        pgp_timeout
        pgp_use_gpg_agent

        pgp_mime_auto
        pgp_auto_decode
        pgp_autoinline
        pgp_create_traditional (pgp_autoinline)
        pgp_replyinline
        pgp_auto_traditional (pgp_replyinline)

pgp_cmd (drop all suffixes in favour of prefix)
        pgp_clearsign_command (clearsign)
        pgp_decode_command (decode)
        pgp_decrypt_command (decrypt)
        pgp_encrypt_only_command (encrypt_only)
        pgp_encrypt_sign_command (encrypt_sign)
        pgp_export_command (export)
        pgp_getkeys_command (getkeys)
        pgp_import_command (import)
        pgp_list_pubring_command (list_pubring)
        pgp_list_secring_command (list_secring)
        pgp_sign_command (sign)
        pgp_verify_command (verify)
        pgp_verify_key_command (verify_key)

smime
        smime_ask_cert_label
        smime_decrypt_use_default_key
        smime_timeout
        smime_encrypt_with
        smime_keys
        smime_ca_location
        smime_certificates
        smime_default_key
        smime_sign_as (smime_default_key)

smime_cmd (drop all suffixes in favour of prefix)
        smime_decrypt_command (decrypt)
        smime_verify_command (verify)
        smime_verify_opaque_command (verify_opaque)
        smime_sign_command (sign)
        smime_sign_opaque_command (sign_opaque)
        smime_encrypt_command (encrypt)
        smime_pk7out_command (pk7out)
        smime_get_cert_command (get_cert)
        smime_get_signer_cert_command (get_signer_cert)
        smime_import_cert_command (import_cert)
        smime_get_cert_email_command (get_cert_email)

remote
        connect_timeout
        net_inc
        preconnect (preconnect_cmd)
        tunnel (tunnel_cmd)

imap
        imap_authenticators
        imap_check_subscribed
        imap_delim_chars
        imap_headers
        imap_home_namespace
        imap_idle
        imap_keepalive
        imap_list_subscribed
        imap_login
        imap_pass
        imap_passive
        imap_peek
        imap_servernoise
        imap_user

pop
        pop_auth_try_all
        pop_authenticators
        pop_checkinterval (mail_check)
        pop_delete
        pop_host
        pop_last
        pop_pass
        pop_reconnect
        pop_user

ssl
        certificate_file (cert_file)
        entropy_file
        ssl_ca_certificates_file (ca_cert_file)
        ssl_client_cert
        ssl_force_tls
        ssl_min_dh_prime_bits
        ssl_starttls
        imap_force_ssl (ssl_force_tls)
        ssl_use_sslv2
        ssl_use_sslv3
        ssl_use_tlsv1
        ssl_usesystemcerts

misc
        beep
        beep_new
        default_hook
        ispell (ispell_cmd)
        mix_entry_format
        mixmaster
        sig_on_top
        visual
        escape
        history
        meta_key

new (1.5.15-1.5.19~tip)
    1.5.15
        assumed_charset
        attach_charset
        check_mbox_size
        crypt_use_pka
        history_file
        ignore_linear_white_space
        save_history
        smtp_url
        wrap
    1.5.16
        message_cache_clean
        smtp_pass
    1.5.18
        query_format
        time_inc
    1.5.19
        imap_pipeline_depth
        ssl_client_cert
    "tip"/1.5.20(?)
        honor_disposition
        search_context
        ssl_verify_dates
        ssl_verify_hostname