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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Copyright (C) 2000-2003 Ximian Inc.
 *
 *  Authors: Michael Zucchi <notzed@ximian.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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. */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

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

#include <glib.h>

#include "camel-folder-search.h"
#include "camel-folder-thread.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"
#include "camel-search-private.h"

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

struct _CamelFolderSearchPrivate {
    GHashTable *mempool_hash;
    CamelException *ex;

    CamelFolderThread *threads;
    GHashTable *threads_hash;
};

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

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

static ESExpResult *search_header_contains(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search);
static ESExpResult *search_header_matches(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search);
static ESExpResult *search_header_starts_with(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search);
static ESExpResult *search_header_ends_with(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search);
static ESExpResult *search_header_exists(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_match_threads(struct _ESExp *f, int argc, struct _ESExpTerm **argv, CamelFolderSearch *s);
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_get_size(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *s);
static ESExpResult *search_uid(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->not = search_not;

    klass->match_all = search_match_all;
    klass->match_threads = search_match_threads;
    klass->body_contains = search_body_contains;
    klass->header_contains = search_header_contains;
    klass->header_matches = search_header_matches;
    klass->header_starts_with = search_header_starts_with;
    klass->header_ends_with = search_header_ends_with;
    klass->header_exists = search_header_exists;
    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;
    klass->get_size = search_get_size;
    klass->uid = search_uid;
}

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);
    if (search->summary_hash)
        g_hash_table_destroy(search->summary_hash);

    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 },
    /* we need to override this one though to implement an 'array not' */
    { "not", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, not), 0 },
    { "<", 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 parses, or should they not?? */
    { "match-all", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, match_all), 3 },
    { "match-threads", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, match_threads), 3 },
    { "body-contains", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, body_contains), 1 },
    { "header-contains", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, header_contains), 1 },
    { "header-matches", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, header_matches), 1 },
    { "header-starts-with", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, header_starts_with), 1 },
    { "header-ends-with", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, header_ends_with), 1 },
    { "header-exists", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, header_exists), 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 },
    { "get-size", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, get_size), 1 },
    { "uid", CAMEL_STRUCT_OFFSET(CamelFolderSearchClass, uid), 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)));
            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)
{
    int i;

    search->summary = summary;
    if (search->summary_hash)
        g_hash_table_destroy(search->summary_hash);
    search->summary_hash = g_hash_table_new(g_str_hash, g_str_equal);
    for (i=0;i<summary->len;i++)
        g_hash_table_insert(search->summary_hash, (char *)camel_message_info_uid(summary->pdata[i]), summary->pdata[i]);
}

/**
 * camel_folder_search_set_body_index:
 * @search: 
 * @index: 
 * 
 * Set the index 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, CamelIndex *index)
{
    if (search->body_index)
        camel_object_unref((CamelObject *)search->body_index);
    search->body_index = index;
    if (index)
        camel_object_ref((CamelObject *)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;
    int i;
    GHashTable *results;
    EMemPool *pool;
    struct _CamelFolderSearchPrivate *p = _PRIVATE(search);

    p->ex = ex;

    /* 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));
        if (e_sexp_parse(search->sexp) == -1) {
            camel_exception_setv(ex, 1, _("Cannot parse search expression: %s:\n%s"), e_sexp_error(search->sexp), expr);
            return NULL;
        }

        g_free(search->last_search);
        search->last_search = g_strdup(expr);
    }
    r = e_sexp_eval(search->sexp);
    if (r == NULL) {
        if (!camel_exception_is_set(ex))
            camel_exception_setv(ex, 1, _("Error executing search expression: %s:\n%s"), e_sexp_error(search->sexp), expr);
        return NULL;
    }

    matches = g_ptr_array_new();

    /* now create a folder summary to return?? */
    if (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), GINT_TO_POINTER (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)));
            }
        }
        /* 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 {
        g_warning("Search returned an invalid result type");
    }

    e_sexp_result_free(search->sexp, r);

    if (p->threads)
        camel_folder_thread_messages_unref(p->threads);
    if (p->threads_hash)
        g_hash_table_destroy(p->threads_hash);

    p->threads = NULL;
    p->threads_hash = NULL;
    search->folder = NULL;
    search->summary = NULL;
    search->current = NULL;
    search->body_index = NULL;

    return matches;
}

/**
 * camel_folder_search_search:
 * @search: 
 * @expr: 
 * @uids: to search against, NULL for all uid's.
 * @ex: 
 * 
 * Run a search.  Search must have had Folder already set on it, and
 * it must implement summaries.
 * 
 * Return value: 
 **/
GPtrArray *
camel_folder_search_search(CamelFolderSearch *search, const char *expr, GPtrArray *uids, CamelException *ex)
{
    ESExpResult *r;
    GPtrArray *matches = NULL, *summary_set;
    int i;
    GHashTable *results;
    EMemPool *pool;
    struct _CamelFolderSearchPrivate *p = _PRIVATE(search);

    g_assert(search->folder);

    p->ex = ex;

    /* setup our search list, summary_hash only contains those we're interested in */
    search->summary = camel_folder_get_summary(search->folder);
    search->summary_hash = g_hash_table_new(g_str_hash, g_str_equal);

    if (uids) {
        GHashTable *uids_hash = g_hash_table_new(g_str_hash, g_str_equal);

        summary_set = search->summary_set = g_ptr_array_new();
        for (i=0;i<uids->len;i++)
            g_hash_table_insert(uids_hash, uids->pdata[i], uids->pdata[i]);
        for (i=0;i<search->summary->len;i++)
            if (g_hash_table_lookup(uids_hash, camel_message_info_uid(search->summary->pdata[i])))
                g_ptr_array_add(search->summary_set, search->summary->pdata[i]);
    } else {
        summary_set = search->summary;
    }

    for (i=0;i<summary_set->len;i++)
        g_hash_table_insert(search->summary_hash, (char *)camel_message_info_uid(summary_set->pdata[i]), summary_set->pdata[i]);

    /* 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));
        if (e_sexp_parse(search->sexp) == -1) {
            camel_exception_setv(ex, 1, _("Cannot parse search expression: %s:\n%s"), e_sexp_error(search->sexp), expr);
            goto fail;
        }

        g_free(search->last_search);
        search->last_search = g_strdup(expr);
    }
    r = e_sexp_eval(search->sexp);
    if (r == NULL) {
        if (!camel_exception_is_set(ex))
            camel_exception_setv(ex, 1, _("Error executing search expression: %s:\n%s"), e_sexp_error(search->sexp), expr);
        goto fail;
    }

    matches = g_ptr_array_new();

    /* now create a folder summary to return?? */
    if (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);
        /* 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), GINT_TO_POINTER (1));
        }

        for (i=0;i<summary_set->len;i++) {
            CamelMessageInfo *info = g_ptr_array_index(summary_set, 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);

        /* 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 {
        g_warning("Search returned an invalid result type");
    }

    e_sexp_result_free(search->sexp, r);
fail:
    /* these might be allocated by match-threads */
    if (p->threads)
        camel_folder_thread_messages_unref(p->threads);
    if (p->threads_hash)
        g_hash_table_destroy(p->threads_hash);
    if (search->summary_set)
        g_ptr_array_free(search->summary_set, TRUE);
    g_hash_table_destroy(search->summary_hash);
    camel_folder_free_summary(search->folder, search->summary);

    p->threads = NULL;
    p->threads_hash = NULL;
    search->folder = NULL;
    search->summary = NULL;
    search->summary_hash = NULL;
    search->summary_set = NULL;
    search->current = NULL;
    search->body_index = NULL;

    return matches;
}

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(f, ESEXP_RES_BOOL);
        r->value.bool = FALSE;
    } else {
        r = e_sexp_result_new(f, ESEXP_RES_ARRAY_PTR);
        r->value.ptrarray = g_ptr_array_new();
    }

    return r;
}

/* impelemnt an 'array not', i.e. everything in the summary, not in the supplied array */
static ESExpResult *
search_not(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    ESExpResult *r;
    int i;

    if (argc>0) {
        if (argv[0]->type == ESEXP_RES_ARRAY_PTR) {
            GPtrArray *v = argv[0]->value.ptrarray;
            const char *uid;

            r = e_sexp_result_new(f, ESEXP_RES_ARRAY_PTR);
            r->value.ptrarray = g_ptr_array_new();

            /* not against a single message?*/
            if (search->current) {
                int found = FALSE;

                uid = camel_message_info_uid(search->current);
                for (i=0;!found && i<v->len;i++) {
                    if (strcmp(uid, v->pdata[i]) == 0)
                        found = TRUE;
                }

                if (!found)
                    g_ptr_array_add(r->value.ptrarray, (char *)uid);
            } else if (search->summary == NULL) {
                g_warning("No summary set, 'not' against an array requires a summary");
            } else {
                /* 'not' against the whole summary */
                GHashTable *have = g_hash_table_new(g_str_hash, g_str_equal);
                char **s;
                CamelMessageInfo **m;

                s = (char **)v->pdata;
                for (i=0;i<v->len;i++)
                    g_hash_table_insert(have, s[i], s[i]);

                v = search->summary_set?search->summary_set:search->summary;
                m = (CamelMessageInfo **)v->pdata;
                for (i=0;i<v->len;i++) {
                    char *uid = (char *)camel_message_info_uid(m[i]);

                    if (g_hash_table_lookup(have, uid) == NULL)
                        g_ptr_array_add(r->value.ptrarray, uid);
                }
                g_hash_table_destroy(have);
            }
        } else {
            int res = TRUE;

            if (argv[0]->type == ESEXP_RES_BOOL)
                res = ! argv[0]->value.bool;

            r = e_sexp_result_new(f, ESEXP_RES_BOOL);
            r->value.bool = res;
        }
    } else {
        r = e_sexp_result_new(f, ESEXP_RES_BOOL);
        r->value.bool = TRUE;
    }

    return r;
}

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

    if (argc>1) {
        g_warning("match-all only takes a single argument, other arguments ignored");
    }

    /* we are only matching a single message?  or already inside a match-all? */
    if (search->current) {
        d(printf("matching against 1 message: %s\n", camel_message_info_subject(search->current)));

        r = e_sexp_result_new(f, ESEXP_RES_BOOL);
        r->value.bool = FALSE;

        if (argc>0) {
            r1 = e_sexp_term_eval(f, argv[0]);
            if (r1->type == ESEXP_RES_BOOL) {
                r->value.bool = r1->value.bool;
            } else {
                g_warning("invalid syntax, matches require a single bool result");
                e_sexp_fatal_error(f, _("(match-all) requires a single bool result"));
            }
            e_sexp_result_free(f, r1);
        } else {
            r->value.bool = TRUE;
        }
        return r;
    }

    r = e_sexp_result_new(f, ESEXP_RES_ARRAY_PTR);
    r->value.ptrarray = g_ptr_array_new();

    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");
        g_assert(0);
        return r;
    }

    v = search->summary_set?search->summary_set:search->summary;
    for (i=0;i<v->len;i++) {
        const char *uid;

        search->current = g_ptr_array_index(v, i);
        uid = camel_message_info_uid(search->current);

        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 *)uid);
            } else {
                g_warning("invalid syntax, matches require a single bool result");
                e_sexp_fatal_error(f, _("(match-all) requires a single bool result"));
            }
            e_sexp_result_free(f, r1);
        } else {
            g_ptr_array_add(r->value.ptrarray, (char *)uid);
        }
    }
    search->current = NULL;

    return r;
}

static void
fill_thread_table(struct _CamelFolderThreadNode *root, GHashTable *id_hash)
{
    while (root) {
        g_hash_table_insert(id_hash, (char *)camel_message_info_uid(root->message), root);
        if (root->child)
            fill_thread_table(root->child, id_hash);
        root = root->next;
    }
}

static void
add_thread_results(struct _CamelFolderThreadNode *root, GHashTable *result_hash)
{
    while (root) {
        g_hash_table_insert(result_hash, (char *)camel_message_info_uid(root->message), GINT_TO_POINTER (1));
        if (root->child)
            add_thread_results(root->child, result_hash);
        root = root->next;
    }
}

static void
add_results(char *uid, void *dummy, GPtrArray *result)
{
    g_ptr_array_add(result, uid);
}

static ESExpResult *
search_match_threads(struct _ESExp *f, int argc, struct _ESExpTerm **argv, CamelFolderSearch *search)
{
    ESExpResult *r;
    struct _CamelFolderSearchPrivate *p = search->priv;
    int i, type;
    GHashTable *results;

    /* not supported in match-all */
    if (search->current)
        e_sexp_fatal_error(f, _("(match-threads) now allowed inside match-all"));

    if (argc == 0)
        e_sexp_fatal_error(f, _("(match-threads) requires a match type string"));

    r = e_sexp_term_eval(f, argv[0]);
    if (r->type != ESEXP_RES_STRING)
        e_sexp_fatal_error(f, _("(match-threads) requires a match type string"));

    type = 0;
    if (!strcmp(r->value.string, "none"))
        type = 0;
    else if (!strcmp(r->value.string, "all"))
        type = 1;
    else if (!strcmp(r->value.string, "replies"))
        type = 2;
    else if (!strcmp(r->value.string, "replies_parents"))
        type = 3;
    e_sexp_result_free(f, r);

    /* behave as (begin does */
    r = NULL;
    for (i=1;i<argc;i++) {
        if (r)
            e_sexp_result_free(f, r);
        r = e_sexp_term_eval(f, argv[i]);
    }

    printf("match-threads, result %d\n", r==NULL?-1:r->type);
    if (r == NULL || r->type != ESEXP_RES_ARRAY_PTR)
        e_sexp_fatal_error(f, _("(match-threads) expects an array result"));

    if (type == 0)
        return r;

    if (search->folder == NULL)
        e_sexp_fatal_error(f, _("(match-threads) requires the folder set"));

    /* cache this, so we only have to re-calculate once per search at most */
    if (p->threads == NULL) {
        p->threads = camel_folder_thread_messages_new(search->folder, NULL, TRUE);
        p->threads_hash = g_hash_table_new(g_str_hash, g_str_equal);

        fill_thread_table(p->threads->tree, p->threads_hash);
    }

    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), GINT_TO_POINTER (1));
    }

    for (i=0;i<r->value.ptrarray->len;i++) {
        struct _CamelFolderThreadNode *node, *scan;

        node = g_hash_table_lookup(p->threads_hash, (char *)g_ptr_array_index(r->value.ptrarray, i));
        if (node == NULL) /* this shouldn't happen but why cry over spilt milk */
            continue;

        /* select messages in thread according to search criteria */
        if (type == 3) {
            scan = node;
            while (scan && scan->parent) {
                scan = scan->parent;
                g_hash_table_insert(results, (char *)camel_message_info_uid(scan->message), GINT_TO_POINTER(1));
            }
        } else if (type == 1) {
            while (node && node->parent)
                node = node->parent;
        }
        g_hash_table_insert(results, (char *)camel_message_info_uid(node->message), GINT_TO_POINTER(1));
        if (node->child)
            add_thread_results(node->child, results);
    }
    e_sexp_result_free(f, r);

    r = e_sexp_result_new(f, ESEXP_RES_ARRAY_PTR);
    r->value.ptrarray = g_ptr_array_new();

    g_hash_table_foreach(results, (GHFunc)add_results, r->value.ptrarray);
    g_hash_table_destroy(results);

    return r;
}

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

    r(printf("executing check-header %d\n", how));

    /* 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, j;
        camel_search_t type = CAMEL_SEARCH_TYPE_ASIS;
        struct _camel_search_words *words;

        /* 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);
            type = CAMEL_SEARCH_TYPE_ADDRESS;
        } else if (!strcasecmp(headername, "to")) {
            header = camel_message_info_to(search->current);
            type = CAMEL_SEARCH_TYPE_ADDRESS;
        } else if (!strcasecmp(headername, "cc")) {
            header = camel_message_info_cc(search->current);
            type = CAMEL_SEARCH_TYPE_ADDRESS;
        } else if (!strcasecmp(headername, "x-camel-mlist")) {
            header = camel_message_info_mlist(search->current);
            type = CAMEL_SEARCH_TYPE_MLIST;
        } else {
            e_sexp_resultv_free(f, argc, argv);
            e_sexp_fatal_error(f, _("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) {
                    if (argv[i]->value.string[0] == 0) {
                        truth = TRUE;
                    } else if (how == CAMEL_SEARCH_MATCH_CONTAINS) {
                        /* doesn't make sense to split words on anything but contains i.e. we can't have an ending match different words */
                        words = camel_search_words_split(argv[i]->value.string);
                        truth = TRUE;
                        for (j=0;j<words->len && truth;j++) {
                            truth = camel_search_header_match(header, words->words[j]->word, how, type, NULL);
                        }
                        camel_search_words_free(words);
                    } else {
                        truth = camel_search_header_match(header, argv[i]->value.string, how, type, NULL);
                    }
                }
            }
        }
    }
    /* TODO: else, find all matches */

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

    return r;
}

static ESExpResult *
search_header_contains(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    return check_header(f, argc, argv, search, CAMEL_SEARCH_MATCH_CONTAINS);
}

static ESExpResult *
search_header_matches(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    return check_header(f, argc, argv, search, CAMEL_SEARCH_MATCH_EXACT);
}

static ESExpResult *
search_header_starts_with (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    return check_header(f, argc, argv, search, CAMEL_SEARCH_MATCH_STARTS);
}

static ESExpResult *
search_header_ends_with (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    return check_header(f, argc, argv, search, CAMEL_SEARCH_MATCH_ENDS);
}

static ESExpResult *
search_header_exists (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    ESExpResult *r;
    
    r(printf ("executing header-exists\n"));
    
    if (search->current) {
        r = e_sexp_result_new(f, ESEXP_RES_BOOL);
        if (argc == 1 && argv[0]->type == ESEXP_RES_STRING)
            r->value.bool = camel_medium_get_header(CAMEL_MEDIUM(search->current), argv[0]->value.string) != NULL;
        
    } else {
        r = e_sexp_result_new(f, ESEXP_RES_ARRAY_PTR);
        r->value.ptrarray = g_ptr_array_new();
    }
    
    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);
}

/* and, only store duplicates */
static void
g_lib_sux_htand(char *key, int value, struct _glib_sux_donkeys *fuckup)
{
    if (value == fuckup->count)
        g_ptr_array_add(fuckup->uids, key);
}

static int
match_message_index(CamelIndex *idx, const char *uid, const char *match, CamelException *ex)
{
    CamelIndexCursor *wc, *nc;
    const char *word, *name;
    int truth = FALSE;

    wc = camel_index_words(idx);
    if (wc) {
        while (!truth && (word = camel_index_cursor_next(wc))) {
            if (camel_ustrstrcase(word,match) != NULL) {
                /* perf: could have the wc cursor return the name cursor */
                nc = camel_index_find(idx, word);
                if (nc) {
                    while (!truth && (name = camel_index_cursor_next(nc)))
                        truth = strcmp(name, uid) == 0;
                    camel_object_unref((CamelObject *)nc);
                }
            }
        }
        camel_object_unref((CamelObject *)wc);
    }

    return truth;
}

/*
 "one two" "three" "four five"

  one and two
or
  three
or
  four and five
*/

/* returns messages which contain all words listed in words */
static GPtrArray *
match_words_index(CamelFolderSearch *search, struct _camel_search_words *words, CamelException *ex)
{
    GPtrArray *result = g_ptr_array_new();
    GHashTable *ht = g_hash_table_new(g_str_hash, g_str_equal);
    struct _glib_sux_donkeys lambdafoo;
    CamelIndexCursor *wc, *nc;
    const char *word, *name;
    CamelMessageInfo *mi;
    int i;

    /* we can have a maximum of 32 words, as we use it as the AND mask */
            
    wc = camel_index_words(search->body_index);
    if (wc) {
        while ((word = camel_index_cursor_next(wc))) {
            for (i=0;i<words->len;i++) {
                if (camel_ustrstrcase(word, words->words[i]->word) != NULL) {
                    /* perf: could have the wc cursor return the name cursor */
                    nc = camel_index_find(search->body_index, word);
                    if (nc) {
                        while ((name = camel_index_cursor_next(nc))) {
                            mi = g_hash_table_lookup(search->summary_hash, name);
                            if (mi) {
                                int mask;
                                const char *uid = camel_message_info_uid(mi);

                                mask = (GPOINTER_TO_INT(g_hash_table_lookup(ht, uid))) | (1<<i);
                                g_hash_table_insert(ht, (char *)uid, GINT_TO_POINTER(mask));
                            }
                        }
                        camel_object_unref((CamelObject *)nc);
                    }
                }
            }
        }
        camel_object_unref((CamelObject *)wc);

        lambdafoo.uids = result;
        lambdafoo.count = (1<<words->len) - 1;
        g_hash_table_foreach(ht, (GHFunc)g_lib_sux_htand, &lambdafoo);
        g_hash_table_destroy(ht);
    }

    return result;
}

static gboolean
match_words_1message (CamelDataWrapper *object, struct _camel_search_words *words, guint32 *mask)
{
    CamelDataWrapper *containee;
    int truth = FALSE;
    int parts, i;
    
    containee = camel_medium_get_content_object (CAMEL_MEDIUM (object));
    
    if (containee == NULL)
        return FALSE;
    
    /* 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 = match_words_1message(part, words, mask);
        }
    } else if (CAMEL_IS_MIME_MESSAGE (containee)) {
        /* for messages we only look at its contents */
        truth = match_words_1message((CamelDataWrapper *)containee, words, mask);
    } else if (camel_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 ();

        /* FIXME: The match should be part of a stream op */
        camel_data_wrapper_decode_to_stream (containee, CAMEL_STREAM (mem));
        camel_stream_write (CAMEL_STREAM (mem), "", 1);
        for (i=0;i<words->len;i++) {
            /* FIXME: This is horridly slow, and should use a real search algorithm */
            if (camel_ustrstrcase(mem->buffer->data, words->words[i]->word) != NULL) {
                *mask |= (1<<i);
                /* shortcut a match */
                if (*mask == (1<<(words->len))-1)
                    return TRUE;
            }
        }
        
        camel_object_unref (mem);
    }
    
    return truth;
}

static gboolean
match_words_message(CamelFolder *folder, const char *uid, struct _camel_search_words *words, CamelException *ex)
{
    guint32 mask;
    CamelMimeMessage *msg;
    int truth;

    msg = camel_folder_get_message(folder, uid, ex);
    if (msg) {
        mask = 0;
        truth = match_words_1message((CamelDataWrapper *)msg, words, &mask);
        camel_object_unref((CamelObject *)msg);
    } else {
        camel_exception_clear(ex);
        truth = FALSE;
    }

    return truth;
}

static GPtrArray *
match_words_messages(CamelFolderSearch *search, struct _camel_search_words *words, CamelException *ex)
{
    int i;
    GPtrArray *matches = g_ptr_array_new();

    if (search->body_index) {
        GPtrArray *indexed;
        struct _camel_search_words *simple;

        simple = camel_search_words_simple(words);
        indexed = match_words_index(search, simple, ex);
        camel_search_words_free(simple);

        for (i=0;i<indexed->len;i++) {
            const char *uid = g_ptr_array_index(indexed, i);
            
            if (match_words_message(search->folder, uid, words, ex))
                g_ptr_array_add(matches, (char *)uid);
        }
        
        g_ptr_array_free(indexed, TRUE);
    } else {
        GPtrArray *v = search->summary_set?search->summary_set:search->summary;

        for (i=0;i<v->len;i++) {
            CamelMessageInfo *info = g_ptr_array_index(v, i);
            const char *uid = camel_message_info_uid(info);
            
            if (match_words_message(search->folder, uid, words, ex))
                g_ptr_array_add(matches, (char *)uid);
        }
    }

    return matches;
}

static ESExpResult *
search_body_contains(struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *search)
{
    int i, j;
    CamelException *ex = search->priv->ex;
    struct _camel_search_words *words;
    ESExpResult *r;
    struct _glib_sux_donkeys lambdafoo;

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

        if (argc == 1 && argv[0]->value.string[0] == 0) {
            truth = TRUE;
        } else {
            for (i=0;i<argc && !truth;i++) {
                if (argv[i]->type == ESEXP_RES_STRING) {
                    words = camel_search_words_split(argv[i]->value.string);
                    truth = TRUE;
                    if ((words->type & CAMEL_SEARCH_WORD_COMPLEX) == 0 && search->body_index) {
                        for (j=0;j<words->len && truth;j++)
                            truth = match_message_index(search->body_index, camel_message_info_uid(search->current), words->words[j]->word, ex);
                    } else {
                        /* TODO: cache current message incase of multiple body search terms */
                        truth = match_words_message(search->folder, camel_message_info_uid(search->current), words, ex);
                    }
                    camel_search_words_free(words);
                }
            }
        }
        r = e_sexp_result_new(f, ESEXP_RES_BOOL);
        r->value.bool = truth;
    } else {
        r = e_sexp_result_new(f, ESEXP_RES_ARRAY_PTR);
        r->value.ptrarray = g_ptr_array_new();

        if (argc == 1 && argv[0]->value.string[0] == 0) {
            GPtrArray *v = search->summary_set?search->summary_set:search->summary;

            for (i=0;i<v->len;i++) {
                CamelMessageInfo *info = g_ptr_array_index(v, i);

                g_ptr_array_add(r->value.ptrarray, (char *)camel_message_info_uid(info));
            }
        } else {
            GHashTable *ht = g_hash_table_new(g_str_hash, g_str_equal);
            GPtrArray *matches;

            for (i=0;i<argc;i++) {
                if (argv[i]->type == ESEXP_RES_STRING) {
                    words = camel_search_words_split(argv[i]->value.string);
                    if ((words->type & CAMEL_SEARCH_WORD_COMPLEX) == 0 && search->body_index) {
                        matches = match_words_index(search, words, ex);
                    } else {
                        matches = match_words_messages(search, words, ex);
                    }
                    for (j=0;j<matches->len;j++)
                        g_hash_table_insert(ht, matches->pdata[j], matches->pdata[j]);
                    g_ptr_array_free(matches, TRUE);
                    camel_search_words_free(words);
                }
            }
            lambdafoo.uids = r->value.ptrarray;
            g_hash_table_foreach(ht, (GHFunc)g_lib_sux_htor, &lambdafoo);
            g_hash_table_destroy(ht);
        }
    }

    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(f, ESEXP_RES_BOOL);
        r->value.bool = truth;
    } else {
        r = e_sexp_result_new(f, 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(f, ESEXP_RES_BOOL);
        r->value.bool = truth;
    } else {
        r = e_sexp_result_new(f, 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)
{
    const char *value = NULL;
    ESExpResult *r;
    
    r(printf("executing user-tag\n"));
    
    if (argc == 1)
        value = camel_tag_get (&search->current->user_tags, argv[0]->value.string);
    
    r = e_sexp_result_new(f, ESEXP_RES_STRING);
    r->value.string = g_strdup (value ? value : "");
    
    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(f, ESEXP_RES_INT);

        r->value.number = s->current->date_sent;
    } else {
        r = e_sexp_result_new(f, 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(f, ESEXP_RES_INT);

        r->value.number = s->current->date_received;
    } else {
        r = e_sexp_result_new(f, 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(f, ESEXP_RES_INT);
    r->value.number = time (NULL);
    return r;
}

static ESExpResult *
search_get_size (struct _ESExp *f, int argc, struct _ESExpResult **argv, CamelFolderSearch *s)
{
    ESExpResult *r;
    
    r(printf("executing get-size\n"));
    
    /* are we inside a match-all? */
    if (s->current) {
        r = e_sexp_result_new (f, ESEXP_RES_INT);
        r->value.number = s->current->size / 1024;
    } else {
        r = e_sexp_result_new (f, ESEXP_RES_ARRAY_PTR);
        r->value.ptrarray = g_ptr_array_new ();
    }
    
    return r;
}

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

    r(printf("executing uid\n"));

    /* are we inside a match-all? */
    if (search->current) {
        int truth = FALSE;
        const char *uid = camel_message_info_uid(search->current);

        /* performs an OR of all words */
        for (i=0;i<argc && !truth;i++) {
            if (argv[i]->type == ESEXP_RES_STRING
                && !strcmp(uid, argv[i]->value.string)) {
                truth = TRUE;
                break;
            }
        }
        r = e_sexp_result_new(f, ESEXP_RES_BOOL);
        r->value.bool = truth;
    } else {
        r = e_sexp_result_new(f, ESEXP_RES_ARRAY_PTR);
        r->value.ptrarray = g_ptr_array_new();
        for (i=0;i<argc;i++) {
            if (argv[i]->type == ESEXP_RES_STRING)
                g_ptr_array_add(r->value.ptrarray, argv[i]->value.string);
        }
    }

    return r;
}