This file describes the schemata used for notmuch's structured output
format (currently JSON).

[]'s indicate lists.  List items can be marked with a '?', meaning
they are optional; or a '*', meaning there can be zero or more of that
item.  {}'s indicate an object that maps from field identifiers to
values.  An object field marked '?' is optional.  |'s indicate
alternates (e.g., int|string means something can be an int or a
string).

Common non-terminals
--------------------

# Number of seconds since the Epoch
unix_time = int

# Thread ID, sans "thread:"
threadid = string

# Message ID, sans "id:"
messageid = string

notmuch show schema
-------------------

# A top-level set of threads (do_show)
# Returned by notmuch show without a --part argument
thread_set = [thread*]

# Top-level messages in a thread (show_messages)
thread = [thread_node*]

# A message and its replies (show_messages)
thread_node = [
    message?,                 # present if --entire-thread or matched
    [thread_node*]            # children of message
]

# A message (show_message)
message = {
    # (format_message_json)
    id:             messageid,
    match:          bool,
    filename:	    string,
    timestamp:      unix_time, # date header as unix time
    date_relative:  string,   # user-friendly timestamp
    tags:           [string*],

    headers:        headers,
    body:           [part]
}

# A MIME part (show_message_body)
part = {
    # format_part_start_json
    id:             int|string, # part id (currently DFS part number)

    # format_part_encstatus_json
    encstatus?:     encstatus,

    # format_part_sigstatus_json
    sigstatus?:     sigstatus,

    # format_part_content_json
    content-type:   string,
    content-id?:    string,
    # if content-type starts with "multipart/":
    content:        [part*],
    # if content-type is "message/rfc822":
    content:        [{headers: headers, body: [part]}],
    # otherwise (leaf parts):
    filename?:      string,
    content-charset?: string,
    # A leaf part's body content is optional, but may be included if
    # it can be correctly encoded as a string.  Consumers should use
    # this in preference to fetching the part content separately.
    content?:       string
}

# The headers of a message (format_headers_json with raw headers
# and reply = FALSE) or a part (format_headers_message_part_json
# with pretty-printed headers)
headers = {
    Subject:        string,
    From:           string,
    To?:            string,
    Cc?:            string,
    Bcc?:           string,
    Date:           string
}

# Encryption status (format_part_encstatus_json)
encstatus = [{status: "good"|"bad"}]

# Signature status (format_part_sigstatus_json)
sigstatus = [signature*]

signature = {
    # signature_status_to_string
    status:         "none"|"good"|"bad"|"error"|"unknown",
    # if status is "good":
    fingerprint?:   string,
    created?:       unix_time,
    expires?:       unix_time,
    userid?:        string
    # if status is not "good":
    keyid?:         string
    # if the signature has errors:
    errors?:        int
}

notmuch search schema
---------------------

# --output=summary
summary = [thread*]

# --output=threads
threads = [threadid*]

# --output=messages
messages = [messageid*]

# --output=files
files = [string*]

# --output=tags
tags = [string*]

thread = {
    thread:         threadid,
    timestamp:      unix_time,
    date_relative:  string,   # user-friendly timestamp
    matched:        int,      # number of matched messages
    total:          int,      # total messages in thread
    authors:        string,   # comma-separated names with | between
                              # matched and unmatched
    subject:        string
}

notmuch reply schema
--------------------

reply = {
    # The headers of the constructed reply (format_headers_json with
    # raw headers and reply = TRUE)
    reply-headers: reply_headers,

    # As in the show format (format_message_json)
    original: message
}

reply_headers = {
    Subject:        string,
    From:           string,
    To?:            string,
    Cc?:            string,
    Bcc?:           string,
    In-reply-to:    string,
    References:     string
}