/* notmuch - Not much of an email program, (just index and search)

*

* Copyright © 2009 Carl Worth

*

* 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/ .

*

* Author: Carl Worth <cworth@cworth.org>

*/

#include "notmuch-client.h"

#include "tag-util.h"

#include "string-util.h"

static volatile sig_atomic_t interrupted;

static void

handle_sigint (unused (int sig))

{

static char msg[] = "Stopping... \n";

/* This write is "opportunistic", so it's okay to ignore the

* result. It is not required for correctness, and if it does

* fail or produce a short write, we want to get out of the signal

* handler as quickly as possible, not retry it. */

IGNORE_RESULT (write (2, msg, sizeof (msg) - 1));

interrupted = 1;

}

static char *

_optimize_tag_query (void *ctx, const char *orig_query_string,

const tag_op_list_t *list)

{

/* This is subtler than it looks. Xapian ignores the '-' operator

* at the beginning both queries and parenthesized groups and,

* furthermore, the presence of a '-' operator at the beginning of

* a group can inhibit parsing of the previous operator. Hence,

* the user-provided query MUST appear first, but it is safe to

* parenthesize and the exclusion part of the query must not use

* the '-' operator (though the NOT operator is fine). */

char *escaped = NULL;

size_t escaped_len = 0;

char *query_string;

const char *join = "";

size_t i;

/* Don't optimize if there are no tag changes. */

if (tag_op_list_size (list) == 0)

return talloc_strdup (ctx, orig_query_string);

/* Build the new query string */

if (strcmp (orig_query_string, "*") == 0)

query_string = talloc_strdup (ctx, "(");

else

query_string = talloc_asprintf (ctx, "( %s ) and (", orig_query_string);

for (i = 0; i < tag_op_list_size (list) && query_string; i++) {

/* XXX in case of OOM, query_string will be deallocated when

* ctx is, which might be at shutdown */

if (make_boolean_term (ctx,

"tag", tag_op_list_tag (list, i),

&escaped, &escaped_len))

return NULL;

query_string = talloc_asprintf_append_buffer (

query_string, "%s%s%s", join,

tag_op_list_isremove (list, i) ? "" : "not ",

escaped);

join = " or ";

}

if (query_string)

query_string = talloc_strdup_append_buffer (query_string, ")");

talloc_free (escaped);

return query_string;

}

/* Tag messages matching 'query_string' according to 'tag_ops'

*/

static int

tag_query (void *ctx, notmuch_database_t *notmuch, const char *query_string,

tag_op_list_t *tag_ops, tag_op_flag_t flags)

{

notmuch_query_t *query;

notmuch_messages_t *messages;

notmuch_message_t *message;

int ret = NOTMUCH_STATUS_SUCCESS;

/* Optimize the query so it excludes messages that already have

* the specified set of tags. */

query_string = _optimize_tag_query (ctx, query_string, tag_ops);

if (query_string == NULL) {

fprintf (stderr, "Out of memory.\n");

return 1;

}

query = notmuch_query_create (notmuch, query_string);

if (query == NULL) {

fprintf (stderr, "Out of memory.\n");

return 1;

}

/* tagging is not interested in any special sort order */

notmuch_query_set_sort (query, NOTMUCH_SORT_UNSORTED);

for (messages = notmuch_query_search_messages (query);

notmuch_messages_valid (messages) && ! interrupted;

notmuch_messages_move_to_next (messages)) {

message = notmuch_messages_get (messages);

ret = tag_op_list_apply (message, tag_ops, flags | TAG_FLAG_PRE_OPTIMIZED);

notmuch_message_destroy (message);

if (ret != NOTMUCH_STATUS_SUCCESS)

break;

}

notmuch_query_destroy (query);

return ret || interrupted;

}

static int

tag_file (void *ctx, notmuch_database_t *notmuch, tag_op_flag_t flags,

FILE *input)

{

char *line = NULL;

char *query_string = NULL;

size_t line_size = 0;

ssize_t line_len;

int ret = 0;

int warn = 0;

tag_op_list_t *tag_ops;

tag_ops = tag_op_list_create (ctx);

if (tag_ops == NULL) {

fprintf (stderr, "Out of memory.\n");

return 1;

}

while ((line_len = getline (&line, &line_size, input)) != -1 &&

! interrupted) {

ret = parse_tag_line (ctx, line, TAG_FLAG_NONE,

&query_string, tag_ops);

if (ret > 0) {

if (ret != TAG_PARSE_SKIPPED)

/* remember there has been problematic lines */

warn = 1;

ret = 0;

continue;

}

if (ret < 0)

break;

ret = tag_query (ctx, notmuch, query_string, tag_ops, flags);

if (ret)

break;

}

if (line)

free (line);

return ret || warn;

}

int

notmuch_tag_command (void *ctx, int argc, char *argv[])

{

tag_op_list_t *tag_ops = NULL;

char *query_string = NULL;

notmuch_config_t *config;

notmuch_database_t *notmuch;

struct sigaction action;

tag_op_flag_t tag_flags = TAG_FLAG_NONE;

notmuch_bool_t batch = FALSE;

FILE *input = stdin;

char *input_file_name = NULL;

int opt_index;

int ret = 0;

/* Setup our handler for SIGINT */

memset (&action, 0, sizeof (struct sigaction));

action.sa_handler = handle_sigint;

sigemptyset (&action.sa_mask);

action.sa_flags = SA_RESTART;

sigaction (SIGINT, &action, NULL);

notmuch_opt_desc_t options[] = {

{ NOTMUCH_OPT_BOOLEAN, &batch, "batch", 0, 0 },

{ NOTMUCH_OPT_STRING, &input_file_name, "input", 'i', 0 },

{ 0, 0, 0, 0, 0 }

};

opt_index = parse_arguments (argc, argv, options, 1);

if (opt_index < 0)

return 1;

if (input_file_name) {

batch = TRUE;

input = fopen (input_file_name, "r");

if (input == NULL) {

fprintf (stderr, "Error opening %s for reading: %s\n",

input_file_name, strerror (errno));

return 1;

}

}

if (batch) {

if (opt_index != argc) {

fprintf (stderr, "Can't specify both cmdline and stdin!\n");

return 1;

}

} else {

tag_ops = tag_op_list_create (ctx);

if (tag_ops == NULL) {

fprintf (stderr, "Out of memory.\n");

return 1;

}

if (parse_tag_command_line (ctx, argc - opt_index, argv + opt_index,

&query_string, tag_ops))

return 1;

}

config = notmuch_config_open (ctx, NULL, NULL);

if (config == NULL)

return 1;

if (notmuch_database_open (notmuch_config_get_database_path (config),

NOTMUCH_DATABASE_MODE_READ_WRITE, &notmuch))

return 1;

if (notmuch_config_get_maildir_synchronize_flags (config))

tag_flags |= TAG_FLAG_MAILDIR_SYNC;

if (batch)

ret = tag_file (ctx, notmuch, tag_flags, input);

else

ret = tag_query (ctx, notmuch, query_string, tag_ops, tag_flags);

notmuch_database_destroy (notmuch);

if (input != stdin)

fclose (input);

return ret || interrupted;

}