Excerpts from David Bremner's message of Mon Dec 14 15:10:12 -0800 2009:
> OK, I'll wait for Scott's patch, and see how he is using cJSON. Just
> stealing a few functions might be the way to go.
> 
> The cJSON code is less horrifying after running through indent. Now all
> we need is "indent --carl" :)
> 

I took an earlier suggestion and didn't use cJSON, instead writing custom code
for emitting the new format.



Added an "--output=(json|text|)" command-line option to both
notmuch-search and notmuch-show.

In the case of notmuch-show, "--output=json" also implies
"--entire-thread" as the thread structure is implicit in the emitted
document tree.

As a coincidence to the implementation, multipart message ID numbers are
now incremented with each part printed. This changes the previous
semantics, which were unclear and not necessary related to the actual
ordering of the message parts.
---
 Makefile.local   |    3 +-
 json.c           |   73 ++++++++++++++
 notmuch-client.h |    3 +
 notmuch-search.c |  163 +++++++++++++++++++++++++++++---
 notmuch-show.c   |  275 ++++++++++++++++++++++++++++++++++++++++++++++--------
 notmuch.c        |   24 ++++--
 show-message.c   |    4 +-
 7 files changed, 481 insertions(+), 64 deletions(-)
 create mode 100644 json.c

diff --git a/Makefile.local b/Makefile.local
index 933ff4c..53b474b 100644
--- a/Makefile.local
+++ b/Makefile.local
@@ -18,7 +18,8 @@ notmuch_client_srcs =         \
        notmuch-tag.c           \
        notmuch-time.c          \
        query-string.c          \
-       show-message.c
+       show-message.c          \
+       json.c
 
 notmuch_client_modules = $(notmuch_client_srcs:.c=.o)
 notmuch: $(notmuch_client_modules) lib/notmuch.a
diff --git a/json.c b/json.c
new file mode 100644
index 0000000..ee563d6
--- /dev/null
+++ b/json.c
@@ -0,0 +1,73 @@
+/* notmuch - Not much of an email program, (just index and search)
+ *
+ * Copyright © 2009 Carl Worth
+ * Copyright © 2009 Keith Packard
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see http://www.gnu.org/licenses/ .
+ *
+ * Authors: Carl Worth <cwo...@cworth.org>
+ *         Keith Packard <kei...@keithp.com>
+ */
+
+#include "notmuch-client.h"
+
+/*
+ * json_quote_str derived from cJSON's print_string_ptr,
+ * Copyright (c) 2009 Dave Gamble
+ */
+
+char *
+json_quote_str(const void *ctx, const char *str)
+{
+    const char *ptr;
+    char *ptr2;
+    char *out;
+    int len = 0;
+
+    if (!str)
+       return NULL;
+
+    for (ptr = str; *ptr; len++, ptr++) {
+       if (*ptr < 32 || *ptr == '\"' || *ptr == '\\')
+           len++;
+    }
+
+    out = talloc_array (ctx, char, len + 3);
+
+    ptr = str;
+    ptr2 = out;
+
+    *ptr2++ = '\"';
+    while (*ptr) {
+           if (*ptr > 31 && *ptr != '\"' && *ptr != '\\') {
+               *ptr2++ = *ptr++;
+           } else {
+               *ptr2++ = '\\';
+               switch (*ptr++) {
+                   case '\"':  *ptr2++ = '\"'; break;
+                   case '\\':  *ptr2++ = '\\'; break;
+                   case '\b':  *ptr2++ = 'b';  break;
+                   case '\f':  *ptr2++ = 'f';  break;
+                   case '\n':  *ptr2++ = 'n';  break;
+                   case '\r':  *ptr2++ = 'r';  break;
+                   case '\t':  *ptr2++ = 't';  break;
+                   default:     ptr2--;        break;
+               }
+           }
+    }
+    *ptr2++ = '\"';
+    *ptr2++ = '\0';
+
+    return out;
+}
diff --git a/notmuch-client.h b/notmuch-client.h
index 50a30fe..7b844b9 100644
--- a/notmuch-client.h
+++ b/notmuch-client.h
@@ -143,6 +143,9 @@ notmuch_status_t
 show_message_body (const char *filename,
                   void (*show_part) (GMimeObject *part, int *part_count));
 
+char *
+json_quote_str (const void *ctx, const char *str);
+
 /* notmuch-config.c */
 
 typedef struct _notmuch_config notmuch_config_t;
diff --git a/notmuch-search.c b/notmuch-search.c
index dc44eb6..e243747 100644
--- a/notmuch-search.c
+++ b/notmuch-search.c
@@ -20,8 +20,120 @@
 
 #include "notmuch-client.h"
 
+typedef struct search_format {
+    const char *results_start;
+    const char *thread_start;
+    void (*thread) (const void *ctx,
+                   const char *id,
+                   const time_t date,
+                   const int matched,
+                   const int total,
+                   const char *authors,
+                   const char *subject);
+    const char *tag_start;
+    const char *tag;
+    const char *tag_sep;
+    const char *tag_end;
+    const char *thread_sep;
+    const char *thread_end;
+    const char *results_end;
+} search_format_t;
+
+static void
+format_thread_text (const void *ctx,
+                   const char *id,
+                   const time_t date,
+                   const int matched,
+                   const int total,
+                   const char *authors,
+                   const char *subject);
+static const search_format_t format_text = {
+    "",
+       "",
+           format_thread_text,
+           " (",
+               "%s", " ",
+           ")", "",
+       "\n",
+    "",
+};
+
+static void
+format_thread_json (const void *ctx,
+                   const char *id,
+                   const time_t date,
+                   const int matched,
+                   const int total,
+                   const char *authors,
+                   const char *subject);
+static const search_format_t format_json = {
+    "[",
+       "{",
+           format_thread_json,
+           "\"tags\": [",
+               "\"%s\"", ", ",
+           "]", ",\n",
+       "}",
+    "]\n",
+};
+
+static void
+format_thread_text (const void *ctx,
+                   const char *id,
+                   const time_t date,
+                   const int matched,
+                   const int total,
+                   const char *authors,
+                   const char *subject)
+{
+    printf ("thread:%s %12s [%d/%d] %s; %s",
+           id,
+           notmuch_time_relative_date (ctx, date),
+           matched,
+           total,
+           authors,
+           subject);
+}
+
+static void
+format_thread_json (const void *ctx,
+                   const char *id,
+                   const time_t date,
+                   const int matched,
+                   const int total,
+                   const char *authors,
+                   const char *subject)
+{
+    struct tm *tm;
+    char timestamp[40];
+    void *ctx_quote = talloc_new (ctx);
+
+    tm = gmtime (&date);
+    if (tm == NULL)
+       INTERNAL_ERROR ("gmtime failed on thread %s.", id);
+
+    if (strftime (timestamp, sizeof (timestamp), "%s", tm) == 0)
+       INTERNAL_ERROR ("strftime failed on thread %s.", id);
+
+    printf ("\"id\": %s,\n"
+           "\"timestamp\": %s,\n"
+           "\"matched\": %d,\n"
+           "\"total\": %d,\n"
+           "\"authors\": %s,\n"
+           "\"subject\": %s,\n",
+           json_quote_str (ctx_quote, id),
+           timestamp,
+           matched,
+           total,
+           json_quote_str (ctx_quote, authors),
+           json_quote_str (ctx_quote, subject));
+
+    talloc_free (ctx_quote);
+}
+
 static void
 do_search_threads (const void *ctx,
+                  const search_format_t *format,
                   notmuch_query_t *query,
                   notmuch_sort_t sort)
 {
@@ -29,7 +141,9 @@ do_search_threads (const void *ctx,
     notmuch_threads_t *threads;
     notmuch_tags_t *tags;
     time_t date;
-    const char *relative_date;
+    int first_thread = 1;
+
+    fputs (format->results_start, stdout);
 
     for (threads = notmuch_query_search_threads (query);
         notmuch_threads_has_more (threads);
@@ -37,6 +151,9 @@ do_search_threads (const void *ctx,
     {
        int first_tag = 1;
 
+       if (! first_thread)
+           fputs (format->thread_sep, stdout);
+
        thread = notmuch_threads_get (threads);
 
        if (sort == NOTMUCH_SORT_OLDEST_FIRST)
@@ -44,30 +161,37 @@ do_search_threads (const void *ctx,
        else
            date = notmuch_thread_get_newest_date (thread);
 
-       relative_date = notmuch_time_relative_date (ctx, date);
+       fputs (format->thread_start, stdout);
+
+       format->thread (ctx,
+                       notmuch_thread_get_thread_id (thread),
+                       date,
+                       notmuch_thread_get_matched_messages (thread),
+                       notmuch_thread_get_total_messages (thread),
+                       notmuch_thread_get_authors (thread),
+                       notmuch_thread_get_subject (thread));
 
-       printf ("thread:%s %12s [%d/%d] %s; %s",
-               notmuch_thread_get_thread_id (thread),
-               relative_date,
-               notmuch_thread_get_matched_messages (thread),
-               notmuch_thread_get_total_messages (thread),
-               notmuch_thread_get_authors (thread),
-               notmuch_thread_get_subject (thread));
+       fputs (format->tag_start, stdout);
 
-       printf (" (");
        for (tags = notmuch_thread_get_tags (thread);
             notmuch_tags_has_more (tags);
             notmuch_tags_advance (tags))
        {
            if (! first_tag)
-               printf (" ");
-           printf ("%s", notmuch_tags_get (tags));
+               fputs (format->tag_sep, stdout);
+           printf (format->tag, notmuch_tags_get (tags));
            first_tag = 0;
        }
-       printf (")\n");
+
+       fputs (format->tag_end, stdout);
+       fputs (format->thread_end, stdout);
+
+       first_thread = 0;
 
        notmuch_thread_destroy (thread);
     }
+
+    fputs (format->results_end, stdout);
 }
 
 int
@@ -79,6 +203,7 @@ notmuch_search_command (void *ctx, int argc, char *argv[])
     char *query_str;
     char *opt;
     notmuch_sort_t sort = NOTMUCH_SORT_NEWEST_FIRST;
+    const search_format_t *format = &format_text;
     int i;
 
     for (i = 0; i < argc && argv[i][0] == '-'; i++) {
@@ -96,6 +221,16 @@ notmuch_search_command (void *ctx, int argc, char *argv[])
                fprintf (stderr, "Invalid value for --sort: %s\n", opt);
                return 1;
            }
+       } else if (STRNCMP_LITERAL (argv[i], "--output=") == 0) {
+           opt = argv[i] + sizeof ("--output=") - 1;
+           if (strcmp (opt, "text") == 0) {
+               format = &format_text;
+           } else if (strcmp (opt, "json") == 0) {
+               format = &format_json;
+           } else {
+               fprintf (stderr, "Invalid value for --output: %s\n", opt);
+               return 1;
+           }
        } else {
            fprintf (stderr, "Unrecognized option: %s\n", argv[i]);
            return 1;
@@ -132,7 +267,7 @@ notmuch_search_command (void *ctx, int argc, char *argv[])
 
     notmuch_query_set_sort (query, sort);
 
-    do_search_threads (ctx, query, sort);
+    do_search_threads (ctx, format, query, sort);
 
     notmuch_query_destroy (query);
     notmuch_database_close (notmuch);
diff --git a/notmuch-show.c b/notmuch-show.c
index 376aacd..70d2605 100644
--- a/notmuch-show.c
+++ b/notmuch-show.c
@@ -20,8 +20,65 @@
 
 #include "notmuch-client.h"
 
+typedef struct show_format {
+    const char *message_set_start;
+    const char *message_start;
+    void (*message) (const void *ctx,
+                    notmuch_message_t *message,
+                    int indent);
+    const char *header_start;
+    void (*header) (const void *ctx,
+                   notmuch_message_t *message);
+    const char *header_end;
+    const char *body_start;
+    void (*part) (GMimeObject *part,
+                 int *part_count);
+    const char *body_end;
+    const char *message_end;
+    const char *message_set_sep;
+    const char *message_set_end;
+} show_format_t;
+
+static void
+format_message_text (unused (const void *ctx),
+                    notmuch_message_t *message,
+                    int indent);
+static void
+format_headers_text (const void *ctx,
+                    notmuch_message_t *message);
+static void
+format_part_text (GMimeObject *part,
+                 int *part_count);
+static const show_format_t format_text = {
+    "",
+       "\fmessage{ ", format_message_text,
+           "\fheader{\n", format_headers_text, "\fheader}\n",
+           "\fbody{\n", format_part_text, "\fbody}\n",
+       "\fmessage}\n", "",
+    ""
+};
+
+static void
+format_message_json (const void *ctx,
+                    notmuch_message_t *message,
+                    unused (int indent));
+static void
+format_headers_json (const void *ctx,
+                    notmuch_message_t *message);
+static void
+format_part_json (GMimeObject *part,
+                 int *part_count);
+static const show_format_t format_json = {
+    "[",
+       "{", format_message_json,
+           ", \"headers\": {", format_headers_json, "}",
+           ", \"body\": [", format_part_json, "]",
+       "}", ", ",
+    "]"
+};
+
 static const char *
-_get_tags_as_string (void *ctx, notmuch_message_t *message)
+_get_tags_as_string (const void *ctx, notmuch_message_t *message)
 {
     notmuch_tags_t *tags;
     int first = 1;
@@ -48,7 +105,7 @@ _get_tags_as_string (void *ctx, notmuch_message_t *message)
 
 /* Get a nice, single-line summary of message. */
 static const char *
-_get_one_line_summary (void *ctx, notmuch_message_t *message)
+_get_one_line_summary (const void *ctx, notmuch_message_t *message)
 {
     const char *from;
     time_t date;
@@ -67,18 +124,87 @@ _get_one_line_summary (void *ctx, notmuch_message_t 
*message)
 }
 
 static void
-show_part_content (GMimeObject *part)
+format_message_text (unused (const void *ctx), notmuch_message_t *message, int 
indent)
+{
+    printf ("id:%s depth:%d match:%d filename:%s\n",
+           notmuch_message_get_message_id (message),
+           indent,
+           notmuch_message_get_flag (message, NOTMUCH_MESSAGE_FLAG_MATCH),
+           notmuch_message_get_filename (message));
+}
+
+static void
+format_message_json (const void *ctx, notmuch_message_t *message, unused (int 
indent))
+{
+    void *ctx_quote = talloc_new (ctx);
+    
+    printf ("\"id\": %s, \"match\": %s, \"filename\": %s",
+           json_quote_str (ctx_quote, notmuch_message_get_message_id 
(message)),
+           notmuch_message_get_flag (message, NOTMUCH_MESSAGE_FLAG_MATCH) ? 
"true" : "false",
+           json_quote_str (ctx_quote, notmuch_message_get_filename (message)));
+
+    talloc_free (ctx_quote);
+}
+
+static void
+format_headers_text (const void *ctx, notmuch_message_t *message)
+{
+    const char *headers[] = {
+       "Subject", "From", "To", "Cc", "Bcc", "Date"
+    };
+    const char *name, *value;
+    unsigned int i;
+
+    printf ("%s\n", _get_one_line_summary (ctx, message));
+
+    for (i = 0; i < ARRAY_SIZE (headers); i++) {
+       name = headers[i];
+       value = notmuch_message_get_header (message, name);
+       if (value)
+           printf ("%s: %s\n", name, value);
+    }
+}
+
+static void
+format_headers_json (const void *ctx, notmuch_message_t *message)
+{
+    const char *headers[] = {
+       "Subject", "From", "To", "Cc", "Bcc", "Date"
+    };
+    const char *name, *value;
+    unsigned int i;
+    int first_header = 1;
+    void *ctx_quote = talloc_new (ctx);
+
+    for (i = 0; i < ARRAY_SIZE (headers); i++) {
+       name = headers[i];
+       value = notmuch_message_get_header (message, name);
+       if (value)
+       {
+           if (!first_header)
+               fputs (", ", stdout);
+           first_header = 0;
+
+           printf ("%s: %s",
+                   json_quote_str (ctx_quote, name),
+                   json_quote_str (ctx_quote, value));
+       }
+    }
+
+    talloc_free (ctx_quote);
+}
+
+static void
+show_part_content (GMimeObject *part, GMimeStream *stream_out)
 {
-    GMimeStream *stream_stdout = g_mime_stream_file_new (stdout);
     GMimeStream *stream_filter = NULL;
     GMimeDataWrapper *wrapper;
     const char *charset;
 
     charset = g_mime_object_get_content_type_parameter (part, "charset");
 
-    if (stream_stdout) {
-       g_mime_stream_file_set_owner (GMIME_STREAM_FILE (stream_stdout), FALSE);
-       stream_filter = g_mime_stream_filter_new(stream_stdout);
+    if (stream_out) {
+       stream_filter = g_mime_stream_filter_new(stream_out);
        g_mime_stream_filter_add(GMIME_STREAM_FILTER(stream_filter),
                                 g_mime_filter_crlf_new(FALSE, FALSE));
         if (charset) {
@@ -92,15 +218,16 @@ show_part_content (GMimeObject *part)
        g_mime_data_wrapper_write_to_stream (wrapper, stream_filter);
     if (stream_filter)
        g_object_unref(stream_filter);
-    if (stream_stdout)
-       g_object_unref(stream_stdout);
 }
 
 static void
-show_part (GMimeObject *part, int *part_count)
+format_part_text (GMimeObject *part, int *part_count)
 {
     GMimeContentDisposition *disposition;
     GMimeContentType *content_type;
+    GMimeStream *stream_stdout = g_mime_stream_file_new (stdout);
+
+    g_mime_stream_file_set_owner (GMIME_STREAM_FILE (stream_stdout), FALSE);
 
     disposition = g_mime_object_get_content_disposition (part);
     if (disposition &&
@@ -118,11 +245,14 @@ show_part (GMimeObject *part, int *part_count)
        if (g_mime_content_type_is_type (content_type, "text", "*") &&
            !g_mime_content_type_is_type (content_type, "text", "html"))
        {
-           show_part_content (part);
+           show_part_content (part, stream_stdout);
        }
 
        printf ("\fattachment}\n");
 
+       if (stream_stdout)
+           g_object_unref(stream_stdout);
+
        return;
     }
 
@@ -135,7 +265,7 @@ show_part (GMimeObject *part, int *part_count)
     if (g_mime_content_type_is_type (content_type, "text", "*") &&
        !g_mime_content_type_is_type (content_type, "text", "html"))
     {
-       show_part_content (part);
+       show_part_content (part, stream_stdout);
     }
     else
     {
@@ -144,57 +274,93 @@ show_part (GMimeObject *part, int *part_count)
     }
 
     printf ("\fpart}\n");
+
+    if (stream_stdout)
+       g_object_unref(stream_stdout);
 }
 
 static void
-show_message (void *ctx, notmuch_message_t *message, int indent)
+format_part_json (GMimeObject *part, int *part_count)
 {
-    const char *headers[] = {
-       "Subject", "From", "To", "Cc", "Bcc", "Date"
-    };
-    const char *name, *value;
-    unsigned int i;
+    GMimeContentType *content_type;
+    GMimeContentDisposition *disposition;
+    void *ctx = talloc_new (NULL);
+    GMimeStream *stream_memory = g_mime_stream_mem_new ();
+    GByteArray *part_content;
 
-    printf ("\fmessage{ id:%s depth:%d match:%d filename:%s\n",
-           notmuch_message_get_message_id (message),
-           indent,
-           notmuch_message_get_flag (message, NOTMUCH_MESSAGE_FLAG_MATCH),
-           notmuch_message_get_filename (message));
+    content_type = g_mime_object_get_content_type (GMIME_OBJECT (part));
 
-    printf ("\fheader{\n");
+    if (*part_count > 1)
+       fputs (", ", stdout);
 
-    printf ("%s\n", _get_one_line_summary (ctx, message));
+    printf ("{\"id\": %d, \"content-type\": %s",
+           *part_count,
+           json_quote_str (ctx, g_mime_content_type_to_string (content_type)));
 
-    for (i = 0; i < ARRAY_SIZE (headers); i++) {
-       name = headers[i];
-       value = notmuch_message_get_header (message, name);
-       if (value)
-           printf ("%s: %s\n", name, value);
+    disposition = g_mime_object_get_content_disposition (part);
+    if (disposition &&
+       strcmp (disposition->disposition, GMIME_DISPOSITION_ATTACHMENT) == 0)
+    {
+       const char *filename = g_mime_part_get_filename (GMIME_PART (part));
+
+       printf (", \"filename\": %s", json_quote_str (ctx, filename));
     }
 
-    printf ("\fheader}\n");
-    printf ("\fbody{\n");
+    if (g_mime_content_type_is_type (content_type, "text", "*") &&
+       !g_mime_content_type_is_type (content_type, "text", "html"))
+    {
+       show_part_content (part, stream_memory);
+       part_content = g_mime_stream_mem_get_byte_array (GMIME_STREAM_MEM 
(stream_memory));
+
+       printf (", \"content\": %s", json_quote_str (ctx, (char *) 
part_content->data));
+    }
+
+    fputs ("}", stdout);
+
+    talloc_free (ctx);
+    if (stream_memory)
+       g_object_unref (stream_memory);
+}
+
+static void
+show_message (void *ctx, const show_format_t *format, notmuch_message_t 
*message, int indent)
+{
+    fputs (format->message_start, stdout);
+    format->message(ctx, message, indent);
 
-    show_message_body (notmuch_message_get_filename (message), show_part);
+    fputs (format->header_start, stdout);
+    format->header(ctx, message);
+    fputs (format->header_end, stdout);
 
-    printf ("\fbody}\n");
+    fputs (format->body_start, stdout);
+    show_message_body (notmuch_message_get_filename (message), format->part);
+    fputs (format->body_end, stdout);
 
-    printf ("\fmessage}\n");
+    fputs (format->message_end, stdout);
 }
 
 
 static void
-show_messages (void *ctx, notmuch_messages_t *messages, int indent,
+show_messages (void *ctx, const show_format_t *format, notmuch_messages_t 
*messages, int indent,
               notmuch_bool_t entire_thread)
 {
     notmuch_message_t *message;
     notmuch_bool_t match;
+    int first_set = 1;
     int next_indent;
 
+    fputs (format->message_set_start, stdout);
+
     for (;
         notmuch_messages_has_more (messages);
         notmuch_messages_advance (messages))
     {
+       if (!first_set)
+           fputs (format->message_set_sep, stdout);
+       first_set = 0;
+
+       fputs (format->message_set_start, stdout);
+
        message = notmuch_messages_get (messages);
 
        match = notmuch_message_get_flag (message, NOTMUCH_MESSAGE_FLAG_MATCH);
@@ -202,15 +368,21 @@ show_messages (void *ctx, notmuch_messages_t *messages, 
int indent,
        next_indent = indent;
 
        if (match || entire_thread) {
-           show_message (ctx, message, indent);
+           show_message (ctx, format, message, indent);
            next_indent = indent + 1;
+
+           fputs (format->message_set_sep, stdout);
        }
 
-       show_messages (ctx, notmuch_message_get_replies (message),
+       show_messages (ctx, format, notmuch_message_get_replies (message),
                       next_indent, entire_thread);
 
        notmuch_message_destroy (message);
+
+       fputs (format->message_set_end, stdout);
     }
+
+    fputs (format->message_set_end, stdout);
 }
 
 int
@@ -223,15 +395,29 @@ notmuch_show_command (void *ctx, unused (int argc), 
unused (char *argv[]))
     notmuch_thread_t *thread;
     notmuch_messages_t *messages;
     char *query_string;
+    char *opt;
+    const show_format_t *format = &format_text;
     int entire_thread = 0;
     int i;
+    int first_toplevel = 1;
 
     for (i = 0; i < argc && argv[i][0] == '-'; i++) {
        if (strcmp (argv[i], "--") == 0) {
            i++;
            break;
        }
-        if (strcmp(argv[i], "--entire-thread") == 0) {
+       if (STRNCMP_LITERAL (argv[i], "--output=") == 0) {
+           opt = argv[i] + sizeof ("--output=") - 1;
+           if (strcmp (opt, "text") == 0) {
+               format = &format_text;
+           } else if (strcmp (opt, "json") == 0) {
+               format = &format_json;
+               entire_thread = 1;
+           } else {
+               fprintf (stderr, "Invalid value for --output: %s\n", opt);
+               return 1;
+           }
+       } else if (STRNCMP_LITERAL (argv[i], "--entire-thread") == 0) {
            entire_thread = 1;
        } else {
            fprintf (stderr, "Unrecognized option: %s\n", argv[i]);
@@ -268,6 +454,8 @@ notmuch_show_command (void *ctx, unused (int argc), unused 
(char *argv[]))
        return 1;
     }
 
+    fputs (format->message_set_start, stdout);
+
     for (threads = notmuch_query_search_threads (query);
         notmuch_threads_has_more (threads);
         notmuch_threads_advance (threads))
@@ -280,11 +468,18 @@ notmuch_show_command (void *ctx, unused (int argc), 
unused (char *argv[]))
            INTERNAL_ERROR ("Thread %s has no toplevel messages.\n",
                            notmuch_thread_get_thread_id (thread));
 
-       show_messages (ctx, messages, 0, entire_thread);
+       if (!first_toplevel)
+           fputs (format->message_set_sep, stdout);
+       first_toplevel = 0;
+
+       show_messages (ctx, format, messages, 0, entire_thread);
 
        notmuch_thread_destroy (thread);
+
     }
 
+    fputs (format->message_set_end, stdout);
+
     notmuch_query_destroy (query);
     notmuch_database_close (notmuch);
 
diff --git a/notmuch.c b/notmuch.c
index 2ac8a59..aa2fc12 100644
--- a/notmuch.c
+++ b/notmuch.c
@@ -162,6 +162,11 @@ command_t commands[] = {
       "\n"
       "\t\tSupported options for search include:\n"
       "\n"
+      "\t\t--output=(json|text)\n"
+      "\n"
+      "\t\t\tPresents the results in either JSON or plain-text\n"
+      "\t\t\tformat, which is the default.\n"
+      "\n"
       "\t\t--sort=(newest-first|oldest-first)\n"
       "\n"
       "\t\t\tPresent results in either chronological order\n"
@@ -186,13 +191,18 @@ command_t commands[] = {
       "\t\t\tall messages in the same thread as any matched\n"
       "\t\t\tmessage will be displayed.\n"
       "\n"
-      "\t\tThe output format is plain-text, with all text-content\n"
-      "\t\tMIME parts decoded. Various components in the output,\n"
-      "\t\t('message', 'header', 'body', 'attachment', and MIME 'part')\n"
-      "\t\tare delimited by easily-parsed markers. Each marker consists\n"
-      "\t\tof a Control-L character (ASCII decimal 12), the name of\n"
-      "\t\tthe marker, and then either an opening or closing brace,\n"
-      "\t\t'{' or '}' to either open or close the component.\n"
+      "\t\t--output=(json|text)\n"
+      "\n"
+      "\t\t\tPresents the results in either JSON or plain-text\n"
+      "\t\t\tformat, which is the default.\n"
+      "\n"
+      "\t\tThe plain-text has all text-content MIME parts decoded.\n"
+      "\t\tVarious components in the output, ('message', 'header',\n"
+      "\t\t'body', 'attachment', and MIME 'part') are delimited by\n"
+      "\t\teasily-parsed markers. Each marker consists of a Control-L\n"
+      "\t\tcharacter (ASCII decimal 12), the name of the marker, and\n"
+      "\t\tthen either an opening or closing brace, '{' or '}' to\n"
+      "\t\teither open or close the component.\n"
       "\n"
       "\t\tA common use of \"notmuch show\" is to display a single\n"
       "\t\tthread of email messages. For this, use a search term of\n"
diff --git a/show-message.c b/show-message.c
index 784981b..05ced9c 100644
--- a/show-message.c
+++ b/show-message.c
@@ -26,8 +26,6 @@ static void
 show_message_part (GMimeObject *part, int *part_count,
                   void (*show_part) (GMimeObject *part, int *part_count))
 {
-    *part_count = *part_count + 1;
-
     if (GMIME_IS_MULTIPART (part)) {
        GMimeMultipart *multipart = GMIME_MULTIPART (part);
        int i;
@@ -56,6 +54,8 @@ show_message_part (GMimeObject *part, int *part_count,
        return;
     }
 
+    *part_count = *part_count + 1;
+
     (*show_part) (part, part_count);
 }
-- 
Scott Robinson | http://quadhome.com/

Q: Why are my replies five sentences or less?
A: http://five.sentenc.es/
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