path: root/camel/camel-folder-search.c

/*
 *  Copyright (C) 2000 Helix Code Inc.
 *
 *  Authors: Michael Zucchi <notzed@helixcode.com>
 *
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA
 */

/* This is a helper class for folders to implement the search function.
   It implements enough to do basic searches on folders that can provide
   an in-memory summary and a body index. */

#include <stdio.h>
#include <string.h>
#include <glib.h>
#include <sys/types.h>
#include <regex.h>

#include <gal/widgets/e-unicode.h>
#include "camel-folder-search.h"
#include "string-utils.h"

#include "camel-exception.h"
#include "camel-medium.h"
#include "camel-multipart.h"
#include "camel-mime-message.h"
#include "camel-stream-mem.h"
#include "e-util/e-memory.h"

#define d(x)
#define r(x)

struct _CamelFolderSearchPrivate {
    GHashTable *mempool_hash;
};

#define _PRIVATE(o) (((CamelFolderSearch *)(o))->priv)

static ESExpResult *search_header_contains(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search);
static ESExpResult *search_match_all(struct _ESExp *f, int argc, struct _ESExpTerm **argv, CamelFolderSearch *search);
static ESExpResult *search_body_contains(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search);
static ESExpResult *search_user_flag(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *s);
static ESExpResult *search_user_tag(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *s);
static ESExpResult *search_system_flag(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *s);
static ESExpResult *search_get_sent_date(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *s);
static ESExpResult *search_get_received_date(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *s);
static ESExpResult *search_get_current_date(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *s);

static ESExpResult *search_dummy(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search);

static void camel_folder_search_class_init (CamelFolderSearchClass *klass);
static void camel_folder_search_init       (CamelFolderSearch *obj);
static void camel_folder_search_finalize   (CamelObject *obj);

static CamelObjectClass *camel_folder_search_parent;

static void
camel_folder_search_class_init (CamelFolderSearchClass *klass)
{
    camel_folder_search_parent = camel_type_get_global_classfuncs (camel_object_get_type ());

    klass->match_all = search_match_all;
    klass->body_contains = search_body_contains;
    klass->header_contains = search_header_contains;
    klass->user_tag = search_user_tag;
    klass->user_flag = search_user_flag;
    klass->system_flag = search_system_flag;
    klass->get_sent_date = search_get_sent_date;
    klass->get_received_date = search_get_received_date;
    klass->get_current_date = search_get_current_date;
}

static void
camel_folder_search_init (CamelFolderSearch *obj)
{
    struct _CamelFolderSearchPrivate *p;

    p = _PRIVATE(obj) = g_malloc0(sizeof(*p));

    obj->sexp = e_sexp_new();

    /* use a hash of mempools to associate the returned uid lists with
       the backing mempool.  yes pretty weird, but i didn't want to change
       the api just yet */

    p->mempool_hash = g_hash_table_new(0, 0);
}

static void
free_mempool(void *key, void *value, void *data)
{
    GPtrArray *uids = key;
    EMemPool *pool = value;

    g_warning("Search closed with outstanding result unfreed: %p", uids);

    g_ptr_array_free(uids, TRUE);
    e_mempool_destroy(pool);
}

static void
camel_folder_search_finalize (CamelObject *obj)
{
    CamelFolderSearch *search = (CamelFolderSearch *)obj;
    struct _CamelFolderSearchPrivate *p = _PRIVATE(obj);

    if (search->sexp)
        e_sexp_unref(search->sexp);

    g_free(search->last_search);
    g_hash_table_foreach(p->mempool_hash, free_mempool, obj);
    g_hash_table_destroy(p->mempool_hash);
    g_free(p);
}

CamelType
camel_folder_search_get_type (void)
{
    static CamelType type = CAMEL_INVALID_TYPE;
    
    if (type == CAMEL_INVALID_TYPE) {
        type = camel_type_register (camel_object_get_type (), "CamelFolderSearch",
                        sizeof (CamelFolderSearch),
                        sizeof (CamelFolderSearchClass),
                        (CamelObjectClassInitFunc) camel_folder_search_class_init,
                        NULL,
                        (CamelObjectInitFunc) camel_folder_search_init,
                        (CamelObjectFinalizeFunc) camel_folder_search_finalize);
    }
    
    return type;
}

#ifdef offsetof
#define CAMEL_STRUCT_OFFSET(type, field)        ((gint) offsetof (type, field))
#else
#define CAMEL_STRUCT_OFFSET(type, field)        ((gint) ((gchar*) &((type *) 0)->field))
#endif

struct {
    char *name;
    int offset;
    int flags;      /* 0x02 = immediate, 0x01 = always enter */
} builtins[] = {
    /* these have default implementations in e-sexp */
    { "and", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, and), 2 },
    { "or", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, or), 2 },
    { "not", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, not), 2 },
    { "<", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, lt), 2 },
    { ">", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, gt), 2 },
    { "=", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, eq), 2 },

    /* these we have to use our own default if there is none */
    /* they should all be defined in the language? so it poarses, or should they not?? */
    { "match-all", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, match_all), 3 },
    { "body-contains", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, body_contains), 1 },
    { "header-contains", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, header_contains), 1 },
    { "user-tag", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, user_tag), 1 },
    { "user-flag", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, user_flag), 1 },
    { "system-flag", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, system_flag), 1 },
    { "get-sent-date", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, get_sent_date), 1 },
    { "get-received-date", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, get_received_date), 1 },
    { "get-current-date", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, get_current_date), 1 },
};

void
camel_folder_search_construct (CamelFolderSearch *search)
{
    int i;
    CamelFolderSearchClass *klass = (CamelFolderSearchClass *)CAMEL_OBJECT_GET_CLASS(search);

    for (i=0;i<sizeof(builtins)/sizeof(builtins[0]);i++) {
        void *func;
        /* c is sure messy sometimes */
        func = *((void **)(((char *)klass)+builtins[i].offset));
        if (func == NULL && builtins[i].flags&1) {
            g_warning("Search class doesn't implement '%s' method: %s", builtins[i].name, camel_type_to_name(CAMEL_OBJECT_GET_CLASS(search)->s.type));
            func = (void *)search_dummy;
        }
        if (func != NULL) {
            if (builtins[i].flags&2) {
                e_sexp_add_ifunction(search->sexp, 0, builtins[i].name, (ESExpIFunc *)func, search);
            } else {
                e_sexp_add_function(search->sexp, 0, builtins[i].name, (ESExpFunc *)func, search);
            }
        }
    }
}

/**
 * camel_folder_search_new:
 *
 * Create a new CamelFolderSearch object.
 * 
 * A CamelFolderSearch is a subclassable, extensible s-exp
 * evaluator which enforces a particular set of s-expressions.
 * Particular methods may be overriden by an implementation to
 * implement a search for any sort of backend.
 *
 * Return value: A new CamelFolderSearch widget.
 **/
CamelFolderSearch *
camel_folder_search_new (void)
{
    CamelFolderSearch *new = CAMEL_FOLDER_SEARCH ( camel_object_new (camel_folder_search_get_type ()));

    camel_folder_search_construct(new);
    return new;
}

/**
 * camel_folder_search_set_folder:
 * @search:
 * @folder: A folder.
 * 
 * Set the folder attribute of the search.  This is currently unused, but
 * could be used to perform a slow-search when indexes and so forth are not
 * available.  Or for use by subclasses.
 **/
void
camel_folder_search_set_folder(CamelFolderSearch *search, CamelFolder *folder)
{
    search->folder = folder;
}

/**
 * camel_folder_search_set_summary:
 * @search: 
 * @summary: An array of CamelMessageInfo pointers.
 * 
 * Set the array of summary objects representing the span of the search.
 *
 * If this is not set, then a subclass must provide the functions
 * for searching headers and for the match-all operator.
 **/
void
camel_folder_search_set_summary(CamelFolderSearch *search, GPtrArray *summary)
{
    search->summary = summary;
}

/**
 * camel_folder_search_set_body_index:
 * @search: 
 * @index: 
 * 
 * Set the index (ibex) representing the contents of all messages
 * in this folder.  If this is not set, then the folder implementation
 * should sub-class the CamelFolderSearch and provide its own
 * body-contains function.
 **/
void
camel_folder_search_set_body_index(CamelFolderSearch *search, ibex *index)
{
    search->body_index = index;
}

/**
 * camel_folder_search_execute_expression:
 * @search: 
 * @expr: 
 * @ex: 
 * 
 * Execute the search expression @expr, returning an array of
 * all matches as a GPtrArray of uid's of matching messages.
 *
 * Note that any settings such as set_body_index(), set_folder(),
 * and so on are reset to #NULL once the search has completed.
 *
 * TODO: The interface should probably return summary items instead
 * (since they are much more useful to any client).
 * 
 * Return value: A GPtrArray of strings of all matching messages.
 * This must only be freed by camel_folder_search_free_result.
 **/
GPtrArray *
camel_folder_search_execute_expression(CamelFolderSearch *search, const char *expr, CamelException *ex)
{
    ESExpResult *r;
    GPtrArray *matches = g_ptr_array_new ();
    int i;
    GHashTable *results;
    EMemPool *pool;
    struct _CamelFolderSearchPrivate *p = _PRIVATE(search);

    /* only re-parse if the search has changed */
    if (search->last_search == NULL
        || strcmp(search->last_search, expr)) {
        e_sexp_input_text(search->sexp, expr, strlen(expr));
        e_sexp_parse(search->sexp);
        g_free(search->last_search);
        search->last_search = g_strdup(expr);
    }
    r = e_sexp_eval(search->sexp);

    /* now create a folder summary to return?? */
    if (r
        && r->type == ESEXP_RES_ARRAY_PTR) {
        d(printf("got result ...\n"));
        /* we use a mempool to store the strings, packed in tight as possible, and freed together */
        /* because the strings are often short (like <8 bytes long), we would be wasting appx 50%
           of memory just storing the size tag that malloc assigns us and alignment padding, so this
           gets around that (and is faster to allocate and free as a bonus) */
        pool = e_mempool_new(512, 256, E_MEMPOOL_ALIGN_BYTE);
        if (search->summary) {
            /* reorder result in summary order */
            results = g_hash_table_new(g_str_hash, g_str_equal);
            for (i=0;i<r->value.ptrarray->len;i++) {
                d(printf("adding match: %s\n", (char *)g_ptr_array_index(r->value.ptrarray, i)));
                g_hash_table_insert(results, g_ptr_array_index(r->value.ptrarray, i), (void *)1);
            }
            for (i=0;i<search->summary->len;i++) {
                CamelMessageInfo *info = g_ptr_array_index(search->summary, i);
                char *uid = (char *)camel_message_info_uid(info);
                if (g_hash_table_lookup(results, uid)) {
                    g_ptr_array_add(matches, e_mempool_strdup(pool, uid));
                }
            }
            g_hash_table_destroy(results);
        } else {
            for (i=0;i<r->value.ptrarray->len;i++) {
                d(printf("adding match: %s\n", (char *)g_ptr_array_index(r->value.ptrarray, i)));
                g_ptr_array_add(matches, e_mempool_strdup(pool, g_ptr_array_index(r->value.ptrarray, i)));
            }
        }
        e_sexp_result_free(r);
        /* instead of putting the mempool_hash in the structure, we keep the api clean by
           putting a reference to it in a hashtable.  Lets us do some debugging and catch
           unfree'd results as well. */
        g_hash_table_insert(p->mempool_hash, matches, pool);
    } else {
        printf("no result!\n");
    }

    search->folder = NULL;
    search->summary = NULL;
    search->current = NULL;
    search->body_index = NULL;

    return matches;
}

/**
 * camel_folder_search_match_expression:
 * @search: 
 * @expr: 
 * @info: 
 * @ex: 
 * 
 * Returns #TRUE if the expression matches the specific message info @info.
 * Note that the folder and index may need to be set for body searches to
 * operate as well.
 * 
 * Return value: 
 **/
gboolean
camel_folder_search_match_expression(CamelFolderSearch *search, const char *expr, const CamelMessageInfo *info, CamelException *ex)
{
    GPtrArray *uids;
    int ret = FALSE;

    search->match1 = (CamelMessageInfo *)info;

    uids = camel_folder_search_execute_expression(search, expr, ex);
    if (uids) {
        if (uids->len == 1)
            ret = TRUE;
        camel_folder_search_free_result(search, uids);
    }
    search->match1 = NULL;

    return ret;
}

void camel_folder_search_free_result(CamelFolderSearch *search, GPtrArray *result)
{
    int i;
    struct _CamelFolderSearchPrivate *p = _PRIVATE(search);
    EMemPool *pool;

    pool = g_hash_table_lookup(p->mempool_hash, result);
    if (pool) {
        e_mempool_destroy(pool);
        g_hash_table_remove(p->mempool_hash, result);
    } else {
        for (i=0;i<result->len;i++)
            g_free(g_ptr_array_index(result, i));
    }
    g_ptr_array_free(result, TRUE);
}




/* dummy function, returns false always, or an empty match array */
static ESExpResult *
search_dummy(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    ESExpResult *r;

    if (search->current == NULL) {
        r = e_sexp_result_new(ESEXP_RES_BOOL);
        r->value.bool = FALSE;
    } else {
        r = e_sexp_result_new(ESEXP_RES_ARRAY_PTR);
        r->value.ptrarray = g_ptr_array_new();
    }

    return r;
}

static ESExpResult *
search_match_all(struct _ESExp *f, int argc, struct _ESExpTerm **argv, CamelFolderSearch *search)
{
    int i;
    ESExpResult *r, *r1;

    if (argc>1) {
        g_warning("match-all only takes a single argument, other arguments ignored");
    }
    r = e_sexp_result_new(ESEXP_RES_ARRAY_PTR);
    r->value.ptrarray = g_ptr_array_new();

    /* we are only matching a single message? */
    if (search->match1) {
        search->current = search->match1;

        if (argc>0) {
            r1 = e_sexp_term_eval(f, argv[0]);
            if (r1->type == ESEXP_RES_BOOL) {
                if (r1->value.bool)
                    g_ptr_array_add(r->value.ptrarray, (char *)camel_message_info_uid(search->current));
            } else {
                g_warning("invalid syntax, matches require a single bool result");
            }
            e_sexp_result_free(r1);
        } else {
            g_ptr_array_add(r->value.ptrarray, (char *)camel_message_info_uid(search->current));
        }
        search->current = NULL;

        return r;
    }

    if (search->summary == NULL) {
        /* TODO: make it work - e.g. use the folder and so forth for a slower search */
        g_warning("No summary supplied, match-all doesn't work with no summary");
        return r;
    }

    /* TODO: Could make this a bit faster in the uncommon case (of match-everything) */
    for (i=0;i<search->summary->len;i++) {
        search->current = g_ptr_array_index(search->summary, i);
        if (argc>0) {
            r1 = e_sexp_term_eval(f, argv[0]);
            if (r1->type == ESEXP_RES_BOOL) {
                if (r1->value.bool)
                    g_ptr_array_add(r->value.ptrarray, (char *)camel_message_info_uid(search->current));
            } else {
                g_warning("invalid syntax, matches require a single bool result");
            }
            e_sexp_result_free(r1);
        } else {
            g_ptr_array_add(r->value.ptrarray, (char *)camel_message_info_uid(search->current));
        }
    }
    search->current = NULL;

    return r;
}

static ESExpResult *
search_header_contains(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    ESExpResult *r;
    int truth = FALSE;

    r(printf("executing header-contains\n"));

    /* are we inside a match-all? */
    if (search->current && argc>1
        && argv[0]->type == ESEXP_RES_STRING) {
        char *headername;
        const char *header = NULL;
        char strbuf[32];
        int i;

        /* only a subset of headers are supported .. */
        headername = argv[0]->value.string;
        if (!strcasecmp(headername, "subject")) {
            header = camel_message_info_subject(search->current);
        } else if (!strcasecmp(headername, "date")) {
            /* FIXME: not a very useful form of the date */
            sprintf(strbuf, "%d", (int)search->current->date_sent);
            header = strbuf;
        } else if (!strcasecmp(headername, "from")) {
            header = camel_message_info_from(search->current);
        } else if (!strcasecmp(headername, "to")) {
            header = camel_message_info_to(search->current);
        } else if (!strcasecmp(headername, "cc")) {
            header = camel_message_info_cc(search->current);
        } else {
            g_warning("Performing query on unknown header: %s", headername);
        }

        if (header) {
            /* performs an OR of all words */
            for (i=1;i<argc && !truth;i++) {
                if (argv[i]->type == ESEXP_RES_STRING
                    && e_utf8_strstrcase (header, argv[i]->value.string)) {
                    r(printf("%s got a match with %s of %s\n", camel_message_info_uid(search->current), header, argv[i]->value.string));
                    truth = TRUE;
                    break;
                }
            }
        }
    }
    /* TODO: else, find all matches */

    r = e_sexp_result_new(ESEXP_RES_BOOL);
    r->value.bool = truth;

    return r;
}

/* this is just to OR results together */
struct _glib_sux_donkeys {
    int count;
    GPtrArray *uids;
};

/* or, store all unique values */
static void
g_lib_sux_htor(char *key, int value, struct _glib_sux_donkeys *fuckup)
{
    g_ptr_array_add(fuckup->uids, key);
}

/* performs a 'slow' content-based match */
static gboolean
message_body_contains(CamelDataWrapper *object, regex_t *pattern)
{
    CamelDataWrapper *containee;
    int truth = FALSE;
    int parts, i;

    containee = camel_medium_get_content_object(CAMEL_MEDIUM(object));

    if (containee == NULL)
        return FALSE;

    /* TODO: I find it odd that get_part and get_content_object do not
       add a reference, probably need fixing for multithreading */

    /* using the object types is more accurate than using the mime/types */
    if (CAMEL_IS_MULTIPART(containee)) {
        parts = camel_multipart_get_number(CAMEL_MULTIPART(containee));
        for (i=0;i<parts && truth==FALSE;i++) {
            CamelDataWrapper *part = (CamelDataWrapper *)camel_multipart_get_part(CAMEL_MULTIPART(containee), i);
            if (part) {
                truth = message_body_contains(part, pattern);
            }
        }
    } else if (CAMEL_IS_MIME_MESSAGE(containee)) {
        /* for messages we only look at its contents */
        truth = message_body_contains((CamelDataWrapper *)containee, pattern);
    } else if (header_content_type_is(CAMEL_DATA_WRAPPER(containee)->mime_type, "text", "*")) {
        /* for all other text parts, we look inside, otherwise we dont care */
        CamelStreamMem *mem = (CamelStreamMem *)camel_stream_mem_new();

        camel_data_wrapper_write_to_stream(containee, (CamelStream *)mem);
        camel_stream_write((CamelStream *)mem, "", 1);
        truth = regexec(pattern, mem->buffer->data, 0, NULL, 0) == 0;
        camel_object_unref((CamelObject *)mem);
    }
    return truth;
}

/* builds the regex into pattern */
static int
build_match_regex(regex_t *pattern, int argc, struct _ESExpResult **argv)
{
    GString *match = g_string_new("");
    int c, i, count=0, err;
    char *word;

    /* build a regex pattern we can use to match the words, we OR them together */
    if (argc>1)
        g_string_append_c(match, '(');
    for (i=0;i<argc;i++) {
        if (argv[i]->type == ESEXP_RES_STRING) {
            if (count > 0)
                g_string_append_c(match, '|');
            /* escape any special chars (not sure if this list is complete) */
            word = argv[i]->value.string;
            while ((c = *word++)) {
                if (strchr("*\\.()[]^$+", c) != NULL) {
                    g_string_append_c(match, '\\');
                }
                g_string_append_c(match, c);
            }
            count++;
        } else {
            g_warning("Invalid type passed to body-contains match function");
        }
    }
    if (argc>1)
        g_string_append_c(match, ')');
    err = regcomp(pattern, match->str, REG_EXTENDED|REG_ICASE|REG_NOSUB);
    if (err != 0) {
        char buffer[1024]; /* dont really care if its longer than this ... */
        
        regerror(err, pattern, buffer, 1023);
        g_warning("Internal error with search pattern: %s: %s", match->str, buffer);
        regfree(pattern);
    }
    d(printf("Built regex: '%s'\n", match->str));
    g_string_free(match, TRUE);
    return err;
}

static int
match_message(CamelFolder *folder, const char *uid, regex_t *pattern)
{
    CamelMimeMessage *msg;
    int truth = FALSE;
    CamelException *ex;

    ex = camel_exception_new();
    msg = camel_folder_get_message(folder, uid, ex);
    if (!camel_exception_is_set(ex) && msg!=NULL) {
        truth = message_body_contains((CamelDataWrapper *)msg, pattern);
        camel_object_unref((CamelObject *)msg);
    }
    camel_exception_free(ex);
    return truth;
}

static ESExpResult *
search_body_contains(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    ESExpResult *r;
    int i, j;
    regex_t pattern;

    if (search->current) {
        int truth = FALSE;

        r = e_sexp_result_new(ESEXP_RES_BOOL);
        if (search->body_index) {
            for (i=0;i<argc && !truth;i++) {
                if (argv[i]->type == ESEXP_RES_STRING) {
                    truth = ibex_find_name(search->body_index, (char *)camel_message_info_uid(search->current),
                                   argv[i]->value.string);
                } else {
                    g_warning("Invalid type passed to body-contains match function");
                }
            }
        } else if (search->folder) {
            /* we do a 'slow' direct search */
            if (build_match_regex(&pattern, argc, argv) == 0) {
                truth = match_message(search->folder, camel_message_info_uid(search->current), &pattern);
                regfree(&pattern);
            }
        } else {
            g_warning("Cannot perform indexed body query with no index or folder set");
        }
        r->value.bool = truth;
    } else {
        r = e_sexp_result_new(ESEXP_RES_ARRAY_PTR);

        if (search->body_index) {
            if (argc==1) {
                /* common case */
                r->value.ptrarray = ibex_find(search->body_index, argv[0]->value.string);
            } else {
                GHashTable *ht = g_hash_table_new(g_str_hash, g_str_equal);
                GPtrArray *pa;
                struct _glib_sux_donkeys lambdafoo;

                /* this sux, perform an or operation on the result(s) of each word */
                for (i=0;i<argc;i++) {
                    if (argv[i]->type == ESEXP_RES_STRING) {
                        pa = ibex_find(search->body_index, argv[i]->value.string);
                        for (j=0;j<pa->len;j++) {
                            g_hash_table_insert(ht, g_ptr_array_index(pa, j), (void *)1);
                        }
                        g_ptr_array_free(pa, FALSE);
                    } else {
                        g_warning("invalid type passed to body-contains");
                    }
                }
                lambdafoo.uids = g_ptr_array_new();
                g_hash_table_foreach(ht, (GHFunc)g_lib_sux_htor, &lambdafoo);
                r->value.ptrarray = lambdafoo.uids;
                g_hash_table_destroy(ht);
            }
        } else if (search->folder) {
            /* do a slow search */
            r->value.ptrarray = g_ptr_array_new();
            if (build_match_regex(&pattern, argc, argv) == 0) {
                if (search->summary) {
                    for (i=0;i<search->summary->len;i++) {
                        CamelMessageInfo *info = g_ptr_array_index(search->summary, i);

                        if (match_message(search->folder, camel_message_info_uid(info), &pattern))
                            g_ptr_array_add(r->value.ptrarray, (char *)camel_message_info_uid(info));
                    }
                } /* else?  we could always get the summary from the folder, but then
                     we need to free it later somehow */
                regfree(&pattern);
            }
        } else {
            g_warning("Cannot perform indexed body query with no index or folder set");
            r->value.ptrarray = g_ptr_array_new();
        }
    }

    return r;
}

static ESExpResult *
search_user_flag(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    ESExpResult *r;
    int i;

    r(printf("executing user-flag\n"));

    /* are we inside a match-all? */
    if (search->current) {
        int truth = FALSE;
        /* performs an OR of all words */
        for (i=0;i<argc && !truth;i++) {
            if (argv[i]->type == ESEXP_RES_STRING
                && camel_flag_get(&search->current->user_flags, argv[i]->value.string)) {
                truth = TRUE;
                break;
            }
        }
        r = e_sexp_result_new(ESEXP_RES_BOOL);
        r->value.bool = truth;
    } else {
        r = e_sexp_result_new(ESEXP_RES_ARRAY_PTR);
        r->value.ptrarray = g_ptr_array_new();
    }

    return r;
}

static ESExpResult *
search_system_flag (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    ESExpResult *r;
    
    r(printf ("executing system-flag\n"));
    
    if (search->current) {
        gboolean truth = FALSE;
        
        if (argc == 1)
            truth = camel_system_flag_get (search->current->flags, argv[0]->value.string);
        
        r = e_sexp_result_new (ESEXP_RES_BOOL);
        r->value.bool = truth;
    } else {
        r = e_sexp_result_new (ESEXP_RES_ARRAY_PTR);
        r->value.ptrarray = g_ptr_array_new ();
    }
    
    return r;
}

static ESExpResult *search_user_tag(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    ESExpResult *r;

    r(printf("executing user-tag\n"));

    /* are we inside a match-all? */
    if (search->current) {
        const char *value = NULL;
        if (argc == 1) {
            value = camel_tag_get(&search->current->user_tags, argv[0]->value.string);
        }
        r = e_sexp_result_new(ESEXP_RES_STRING);
        r->value.string = g_strdup(value?value:"");
    } else {
        r = e_sexp_result_new(ESEXP_RES_ARRAY_PTR);
        r->value.ptrarray = g_ptr_array_new();
    }

    return r;
}

static ESExpResult *
search_get_sent_date(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *s)
{
    ESExpResult *r;

    r(printf("executing get-sent-date\n"));

    /* are we inside a match-all? */
    if (s->current) {
        r = e_sexp_result_new (ESEXP_RES_INT);

        r->value.number = s->current->date_sent;
    } else {
        r = e_sexp_result_new (ESEXP_RES_ARRAY_PTR);
        r->value.ptrarray = g_ptr_array_new ();
    }

    return r;
}

static ESExpResult *
search_get_received_date(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *s)
{
    ESExpResult *r;

    r(printf("executing get-received-date\n"));

    /* are we inside a match-all? */
    if (s->current) {
        r = e_sexp_result_new (ESEXP_RES_INT);

        r->value.number = s->current->date_received;
    } else {
        r = e_sexp_result_new (ESEXP_RES_ARRAY_PTR);
        r->value.ptrarray = g_ptr_array_new ();
    }

    return r;
}

static ESExpResult *
search_get_current_date(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *s)
{
    ESExpResult *r;

    r(printf("executing get-current-date\n"));

    r = e_sexp_result_new (ESEXP_RES_INT);
    r->value.number = time (NULL);
    return r;
}