This patch uses the JSON structure printer for notmuch search. The
changes necessary for switching to the structure printer are minor, a
large part of this patch is concerned with keeping the normal
unstructured text output.
---
 notmuch-search.c | 278 ++++++++++++++++++++++++++++++-------------------------
 1 file changed, 150 insertions(+), 128 deletions(-)

diff --git a/notmuch-search.c b/notmuch-search.c
index 3be296d..84e4cbc 100644
--- a/notmuch-search.c
+++ b/notmuch-search.c
@@ -19,6 +19,7 @@
  */
 
 #include "notmuch-client.h"
+#include "structured-output.h"
 
 typedef enum {
     OUTPUT_SUMMARY,
@@ -28,6 +29,7 @@ typedef enum {
     OUTPUT_TAGS
 } output_t;
 
+/* legacy, only needed for non-structured text output */
 typedef struct search_format {
     const char *results_start;
     const char *item_start;
@@ -64,6 +66,7 @@ format_thread_text (const void *ctx,
                    const int total,
                    const char *authors,
                    const char *subject);
+
 static const search_format_t format_text = {
     "",
        "",
@@ -78,35 +81,6 @@ static const search_format_t format_text = {
 };
 
 static void
-format_item_id_json (const void *ctx,
-                    const char *item_type,
-                    const char *item_id);
-
-static void
-format_thread_json (const void *ctx,
-                   const char *thread_id,
-                   const time_t date,
-                   const int matched,
-                   const int total,
-                   const char *authors,
-                   const char *subject);
-
-/* Any changes to the JSON format should be reflected in the file
- * devel/schemata. */
-static const search_format_t format_json = {
-    "[",
-       "{",
-           format_item_id_json,
-           format_thread_json,
-           "\"tags\": [",
-               "\"%s\"", ", ",
-           "]", ",\n",
-       "}",
-    "]\n",
-    "]\n",
-};
-
-static void
 format_item_id_text (unused (const void *ctx),
                     const char *item_type,
                     const char *item_id)
@@ -153,50 +127,9 @@ format_thread_text (const void *ctx,
     talloc_free (ctx_quote);
 }
 
-static void
-format_item_id_json (const void *ctx,
-                    unused (const char *item_type),
-                    const char *item_id)
-{
-    void *ctx_quote = talloc_new (ctx);
-
-    printf ("%s", json_quote_str (ctx_quote, item_id));
-
-    talloc_free (ctx_quote);
-    
-}
-
-static void
-format_thread_json (const void *ctx,
-                   const char *thread_id,
-                   const time_t date,
-                   const int matched,
-                   const int total,
-                   const char *authors,
-                   const char *subject)
-{
-    void *ctx_quote = talloc_new (ctx);
-
-    printf ("\"thread\": %s,\n"
-           "\"timestamp\": %ld,\n"
-           "\"date_relative\": \"%s\",\n"
-           "\"matched\": %d,\n"
-           "\"total\": %d,\n"
-           "\"authors\": %s,\n"
-           "\"subject\": %s,\n",
-           json_quote_str (ctx_quote, thread_id),
-           date,
-           notmuch_time_relative_date (ctx, date),
-           matched,
-           total,
-           json_quote_str (ctx_quote, authors),
-           json_quote_str (ctx_quote, subject));
-
-    talloc_free (ctx_quote);
-}
-
 static int
-do_search_threads (const search_format_t *format,
+do_search_threads (const structure_printer_t *format,
+                  void *state,
                   notmuch_query_t *query,
                   notmuch_sort_t sort,
                   output_t output,
@@ -209,6 +142,8 @@ do_search_threads (const search_format_t *format,
     time_t date;
     int first_thread = 1;
     int i;
+    int outermost_level = 0;
+    int items_level = 0;
 
     if (offset < 0) {
        offset += notmuch_query_count_threads (query);
@@ -220,7 +155,11 @@ do_search_threads (const search_format_t *format,
     if (threads == NULL)
        return 1;
 
-    fputs (format->results_start, stdout);
+    if (format == unstructured_text_printer) {
+       fputs(format_text.results_start, stdout);
+    } else { /* structured output */
+       outermost_level = format->list(state);
+    }
 
     for (i = 0;
         notmuch_threads_valid (threads) && (limit < 0 || i < offset + limit);
@@ -235,43 +174,85 @@ do_search_threads (const search_format_t *format,
            continue;
        }
 
-       if (! first_thread)
-           fputs (format->item_sep, stdout);
+       if (format == unstructured_text_printer && ! first_thread)
+           fputs (format_text.item_sep, stdout);
 
        if (output == OUTPUT_THREADS) {
-           format->item_id (thread, "thread:",
-                            notmuch_thread_get_thread_id (thread));
+           if (format == unstructured_text_printer) {
+               format_text.item_id (thread, "thread:",
+                                    notmuch_thread_get_thread_id (thread));
+           } else { /* structured output */
+               format->string(state, notmuch_thread_get_thread_id (thread));
+           }
        } else { /* output == OUTPUT_SUMMARY */
-           fputs (format->item_start, stdout);
+
+           if (format == unstructured_text_printer) {
+               fputs (format_text.item_start, stdout);
+           } else { /* structured output */
+               items_level = format->map(state);
+           }
 
            if (sort == NOTMUCH_SORT_OLDEST_FIRST)
                date = notmuch_thread_get_oldest_date (thread);
            else
                date = notmuch_thread_get_newest_date (thread);
 
-           format->thread_summary (thread,
-                                   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));
-
-           fputs (format->tag_start, stdout);
+           if (format == unstructured_text_printer) {
+               format_text.thread_summary (thread,
+                                           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));
+           } else { /* structured output */
+               void *ctx = talloc_new (0);
+               format->map_key(state, "thread");
+               format->string(state, notmuch_thread_get_thread_id (thread));
+               format->map_key(state, "timestamp");
+               format->number(state, date);
+               format->map_key(state, "date_relative");
+               format->string(state, notmuch_time_relative_date(ctx, date));
+               format->map_key(state, "matched");
+               format->number(state, 
notmuch_thread_get_matched_messages(thread));
+               format->map_key(state, "total");
+               format->number(state, 
notmuch_thread_get_total_messages(thread));
+               format->map_key(state, "authors");
+               format->string(state, notmuch_thread_get_authors(thread));
+               format->map_key(state, "subject");
+               format->string(state, notmuch_thread_get_subject(thread));
+               talloc_free(ctx);
+           };
+
+           if (format == unstructured_text_printer) {
+               fputs (format_text.tag_start, stdout);
+           } else { /* structured output */
+               format->map_key(state, "tags");
+               format->list(state);
+           }
 
            for (tags = notmuch_thread_get_tags (thread);
                 notmuch_tags_valid (tags);
                 notmuch_tags_move_to_next (tags))
            {
-               if (! first_tag)
-                   fputs (format->tag_sep, stdout);
-               printf (format->tag, notmuch_tags_get (tags));
+               if (format == unstructured_text_printer && ! first_tag) {
+                   fputs (format_text.tag_sep, stdout);
+               }
+
+               if(format == unstructured_text_printer) {
+                   printf (format_text.tag, notmuch_tags_get (tags));
+               } else {
+                   format->string(state, notmuch_tags_get(tags));
+               }
                first_tag = 0;
            }
 
-           fputs (format->tag_end, stdout);
-
-           fputs (format->item_end, stdout);
+           if(format == unstructured_text_printer) {
+               fputs (format_text.tag_end, stdout);
+               fputs (format_text.item_end, stdout);
+           } else { /* structured output */
+               format->pop(state, items_level);
+           }
        }
 
        first_thread = 0;
@@ -279,16 +260,21 @@ do_search_threads (const search_format_t *format,
        notmuch_thread_destroy (thread);
     }
 
-    if (first_thread)
-       fputs (format->results_null, stdout);
-    else
-       fputs (format->results_end, stdout);
+    if (format == unstructured_text_printer) {
+       if (first_thread)
+           fputs (format_text.results_null, stdout);
+       else
+           fputs (format_text.results_end, stdout);
+    } else { /* structured output */
+       format->pop(state, outermost_level);
+    }
 
     return 0;
 }
 
 static int
-do_search_messages (const search_format_t *format,
+do_search_messages (const structure_printer_t *format,
+                   void *state,
                    notmuch_query_t *query,
                    output_t output,
                    int offset,
@@ -299,6 +285,7 @@ do_search_messages (const search_format_t *format,
     notmuch_filenames_t *filenames;
     int first_message = 1;
     int i;
+    int outermost_level = 0;
 
     if (offset < 0) {
        offset += notmuch_query_count_messages (query);
@@ -310,7 +297,11 @@ do_search_messages (const search_format_t *format,
     if (messages == NULL)
        return 1;
 
-    fputs (format->results_start, stdout);
+    if(format == unstructured_text_printer) {
+       fputs (format_text.results_start, stdout);
+    } else { /* structured output */
+       outermost_level = format->list(state);
+    }
 
     for (i = 0;
         notmuch_messages_valid (messages) && (limit < 0 || i < offset + limit);
@@ -328,23 +319,32 @@ do_search_messages (const search_format_t *format,
                 notmuch_filenames_valid (filenames);
                 notmuch_filenames_move_to_next (filenames))
            {
-               if (! first_message)
-                   fputs (format->item_sep, stdout);
+               if (format == unstructured_text_printer) {
+                   if (! first_message)
+                       fputs (format_text.item_sep, stdout);
 
-               format->item_id (message, "",
-                                notmuch_filenames_get (filenames));
+                   format_text.item_id (message, "",
+                                        notmuch_filenames_get (filenames));
+               } else { /* structured output */
+               format->string(state, notmuch_filenames_get (filenames));
+               }
 
                first_message = 0;
            }
-           
+
            notmuch_filenames_destroy( filenames );
 
        } else { /* output == OUTPUT_MESSAGES */
-           if (! first_message)
-               fputs (format->item_sep, stdout);
+           if (format == unstructured_text_printer) {
+               if (! first_message)
+                   fputs (format_text.item_sep, stdout);
+
+               format_text.item_id (message, "id:",
+                                    notmuch_message_get_message_id (message));
+           } else { /* structured output */
+               format->string(state, notmuch_message_get_message_id (message));
+           }
 
-           format->item_id (message, "id:",
-                            notmuch_message_get_message_id (message));
            first_message = 0;
        }
 
@@ -353,23 +353,29 @@ do_search_messages (const search_format_t *format,
 
     notmuch_messages_destroy (messages);
 
-    if (first_message)
-       fputs (format->results_null, stdout);
-    else
-       fputs (format->results_end, stdout);
+    if (format == unstructured_text_printer) {
+       if (first_message)
+           fputs (format_text.results_null, stdout);
+       else
+           fputs (format_text.results_end, stdout);
+    } else { /* structured output */
+       format->pop(state, outermost_level);
+    };
 
     return 0;
 }
 
 static int
 do_search_tags (notmuch_database_t *notmuch,
-               const search_format_t *format,
+               const structure_printer_t *format,
+               void *state,
                notmuch_query_t *query)
 {
     notmuch_messages_t *messages = NULL;
     notmuch_tags_t *tags;
     const char *tag;
     int first_tag = 1;
+    int outermost_level = 0;
 
     /* should the following only special case if no excluded terms
      * specified? */
@@ -387,7 +393,11 @@ do_search_tags (notmuch_database_t *notmuch,
     if (tags == NULL)
        return 1;
 
-    fputs (format->results_start, stdout);
+    if (format == unstructured_text_printer) {
+       fputs (format_text.results_start, stdout);
+    } else { /* structured output */
+       outermost_level = format->list(state);
+    }
 
     for (;
         notmuch_tags_valid (tags);
@@ -395,10 +405,14 @@ do_search_tags (notmuch_database_t *notmuch,
     {
        tag = notmuch_tags_get (tags);
 
-       if (! first_tag)
-           fputs (format->item_sep, stdout);
-
-       format->item_id (tags, "", tag);
+       if (format == unstructured_text_printer) {
+           if (! first_tag) {
+               fputs (format_text.item_sep, stdout);
+           }
+           format_text.item_id (tags, "", tag);
+       } else { /* structured output */
+           format->string(state, tag);
+       }
 
        first_tag = 0;
     }
@@ -408,10 +422,14 @@ do_search_tags (notmuch_database_t *notmuch,
     if (messages)
        notmuch_messages_destroy (messages);
 
-    if (first_tag)
-       fputs (format->results_null, stdout);
-    else
-       fputs (format->results_end, stdout);
+    if (format == unstructured_text_printer) {
+       if (first_tag)
+           fputs (format_text.results_null, stdout);
+       else
+           fputs (format_text.results_end, stdout);
+    } else { /* structured output */
+       format->pop(state, outermost_level);
+    };
 
     return 0;
 }
@@ -430,7 +448,8 @@ notmuch_search_command (void *ctx, int argc, char *argv[])
     notmuch_query_t *query;
     char *query_str;
     notmuch_sort_t sort = NOTMUCH_SORT_NEWEST_FIRST;
-    const search_format_t *format = &format_text;
+    const structure_printer_t *format = unstructured_text_printer;
+    void *state = NULL;
     int opt_index, ret;
     output_t output = OUTPUT_SUMMARY;
     int offset = 0;
@@ -475,13 +494,16 @@ notmuch_search_command (void *ctx, int argc, char *argv[])
 
     switch (format_sel) {
     case NOTMUCH_FORMAT_TEXT:
-       format = &format_text;
+       format = unstructured_text_printer;
        break;
     case NOTMUCH_FORMAT_JSON:
-       format = &format_json;
+       format = &json_structure_printer;
        break;
     }
 
+    if(format != unstructured_text_printer)
+       state = format->initial_state(format, stdout);
+
     config = notmuch_config_open (ctx, NULL, NULL);
     if (config == NULL)
        return 1;
@@ -532,14 +554,14 @@ notmuch_search_command (void *ctx, int argc, char *argv[])
     default:
     case OUTPUT_SUMMARY:
     case OUTPUT_THREADS:
-       ret = do_search_threads (format, query, sort, output, offset, limit);
+       ret = do_search_threads (format, state, query, sort, output, offset, 
limit);
        break;
     case OUTPUT_MESSAGES:
     case OUTPUT_FILES:
-       ret = do_search_messages (format, query, output, offset, limit);
+       ret = do_search_messages (format, state, query, output, offset, limit);
        break;
     case OUTPUT_TAGS:
-       ret = do_search_tags (notmuch, format, query);
+       ret = do_search_tags (notmuch, format, state, query);
        break;
     }
 
-- 
1.7.11.1

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