path: root/mail/mail-local.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* mail-local.c: Local mailbox support. */

/* 
 * Authors: 
 *  Michael Zucchi <NotZed@ximian.com>
 *  Peter Williams <peterw@ximian.com>
 *  Ettore Perazzoli <ettore@ximian.com>
 *  Dan Winship <danw@ximian.com>
 *
 * Copyright 2000 Ximian, Inc. (www.ximian.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
 */

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

#include <unistd.h>
#include <errno.h>

#include <gnome-xml/xmlmemory.h>
#include <libgnomeui/gnome-dialog.h>
#include <libgnomeui/gnome-dialog-util.h>
#include <glade/glade.h>

#include "gal/widgets/e-gui-utils.h"
#include "e-util/e-path.h"

#include "Evolution.h"
#include "evolution-storage.h"
#include "evolution-shell-component.h"
#include "evolution-storage-listener.h"

#include "camel/camel.h"

#include "mail.h"
#include "mail-local.h"
#include "mail-tools.h"
#include "folder-browser.h"
#include "mail-mt.h"
#include "mail-folder-cache.h"
#include "mail-vfolder.h"
#include "mail-ops.h"

#define d(x)

/* sigh, required for passing around to some functions */
static GNOME_Evolution_Storage local_corba_storage = CORBA_OBJECT_NIL;

/* ** MailLocalStore ** (protos) ************************************************** */

#define MAIL_LOCAL_STORE_TYPE     (mail_local_store_get_type ())
#define MAIL_LOCAL_STORE(obj)     (CAMEL_CHECK_CAST((obj), MAIL_LOCAL_STORE_TYPE, MailLocalStore))
#define MAIL_LOCAL_STORE_CLASS(k) (CAMEL_CHECK_CLASS_CAST ((k), MAIL_LOCAL_STORE_TYPE, MailLocalStoreClass))
#define MAIL_IS_LOCAL_STORE(o)    (CAMEL_CHECK_TYPE((o), MAIL_LOCAL_STORE_TYPE))

typedef struct {
    CamelStore parent_object;

    /* stores CamelFolderInfo's of the folders we're supposed to know about, by uri */
    GHashTable *folder_infos;
    GMutex *folder_info_lock;

} MailLocalStore;

typedef struct {
    CamelStoreClass parent_class;
} MailLocalStoreClass;

static CamelType mail_local_store_get_type (void);

static MailLocalStore *global_local_store;

/* ** MailLocalFolder ** (protos) ************************************************* */

#define MAIL_LOCAL_FOLDER_TYPE     (mail_local_folder_get_type ())
#define MAIL_LOCAL_FOLDER(obj)     (CAMEL_CHECK_CAST((obj), MAIL_LOCAL_FOLDER_TYPE, MailLocalFolder))
#define MAIL_LOCAL_FOLDER_CLASS(k) (CAMEL_CHECK_CLASS_CAST ((k), MAIL_LOCAL_FOLDER_TYPE, MailLocalFolderClass))
#define MAIL_IS_LOCAL_FOLDER(o)    (CAMEL_CHECK_TYPE((o), MAIL_LOCAL_FOLDER_TYPE))

#define LOCAL_STORE_LOCK(folder)   (g_mutex_lock   (((MailLocalStore *)folder)->folder_info_lock))
#define LOCAL_STORE_UNLOCK(folder) (g_mutex_unlock (((MailLocalStore *)folder)->folder_info_lock))

struct _local_meta {
    char *path;     /* path of metainfo */

    char *format;       /* format of mailbox */
    char *name;     /* name of actual mbox */
    int indexed;        /* is body indexed? */
};

typedef struct {
    CamelFolder parent_object;

    CamelFolder *real_folder;
    CamelStore *real_store;

    char *real_path;

    struct _local_meta *meta;

    GMutex *real_folder_lock; /* no way to use the CamelFolder's lock, so... */
} MailLocalFolder;

typedef struct {
    CamelFolderClass parent_class;
} MailLocalFolderClass;

static CamelType mail_local_folder_get_type (void);

#ifdef ENABLE_THREADS
#define LOCAL_FOLDER_LOCK(folder)   (g_mutex_lock   (((MailLocalFolder *)folder)->real_folder_lock))
#define LOCAL_FOLDER_UNLOCK(folder) (g_mutex_unlock (((MailLocalFolder *)folder)->real_folder_lock))
#else
#define LOCAL_FOLDER_LOCK(folder)
#define LOCAL_FOLDER_UNLOCK(folder)
#endif

/* ** MailLocalFolder ************************************************************* */

static struct _local_meta *
load_metainfo(const char *path)
{
    xmlDocPtr doc;
    xmlNodePtr node;
    struct _local_meta *meta;

    d(printf("Loading folder metainfo from : %s\n", path));

    meta = g_malloc0(sizeof(*meta));
    meta->path = g_strdup(path);

    doc = xmlParseFile(path);
    if (doc == NULL)
        goto dodefault;

    node = doc->root;
    if (strcmp(node->name, "folderinfo"))
        goto dodefault;

    node = node->childs;
    while (node) {
        if (!strcmp(node->name, "folder")) {
            char *index, *txt;
            
            txt = xmlGetProp(node, "type");
            meta->format = g_strdup(txt?txt:"mbox");
            xmlFree(txt);
            
            txt = xmlGetProp(node, "name");
            meta->name = g_strdup(txt?txt:"mbox");
            xmlFree(txt);
            
            index = xmlGetProp(node, "index");
            if (index) {
                meta->indexed = atoi(index);
                xmlFree(index);
            } else
                meta->indexed = TRUE;
            
        }
        node = node->next;
    }
    xmlFreeDoc(doc);
    return meta;

 dodefault:
    meta->format = g_strdup("mbox"); /* defaults */
    meta->name = g_strdup("mbox");
    meta->indexed = TRUE;
    xmlFreeDoc(doc);
    return meta;
}

static void
free_metainfo(struct _local_meta *meta)
{
    g_free(meta->path);
    g_free(meta->format);
    g_free(meta->name);
    g_free(meta);
}

static gboolean
save_metainfo(struct _local_meta *meta)
{
    xmlDocPtr doc;
    xmlNodePtr root, node;
    int ret;

    d(printf("Saving folder metainfo to : %s\n", meta->path));

    doc = xmlNewDoc("1.0");
    root = xmlNewDocNode(doc, NULL, "folderinfo", NULL);
    xmlDocSetRootElement(doc, root);

    node  = xmlNewChild(root, NULL, "folder", NULL);
    xmlSetProp(node, "type", meta->format);
    xmlSetProp(node, "name", meta->name);
    xmlSetProp(node, "index", meta->indexed?"1":"0");

    ret = xmlSaveFile(meta->path, doc);
    xmlFreeDoc(doc);

    return ret;
}

/* forward a bunch of functions to the real folder. This pretty
 * much sucks but I haven't found a better way of doing it.
 */

/* We need to do it without having locked our folder, otherwise
   we can get sync hangs with vfolders/trash */
static void
mlf_refresh_info(CamelFolder *folder, CamelException *ex)
{
    MailLocalFolder *mlf = MAIL_LOCAL_FOLDER(folder);
    CamelFolder *f;

    LOCAL_FOLDER_LOCK(mlf);
    f = mlf->real_folder;
    camel_object_ref((CamelObject *)f);
    LOCAL_FOLDER_UNLOCK(mlf);

    camel_folder_refresh_info(f, ex);
    camel_object_unref((CamelObject *)f);
}

static void
mlf_sync(CamelFolder *folder, gboolean expunge, CamelException *ex)
{
    MailLocalFolder *mlf = MAIL_LOCAL_FOLDER(folder);
    CamelFolder *f;

    LOCAL_FOLDER_LOCK(mlf);
    f = mlf->real_folder;
    camel_object_ref((CamelObject *)f);
    LOCAL_FOLDER_UNLOCK(mlf);

    camel_folder_sync(f, expunge, ex);
    camel_object_unref((CamelObject *)f);
}

static void
mlf_expunge(CamelFolder *folder, CamelException *ex)
{
    MailLocalFolder *mlf = MAIL_LOCAL_FOLDER(folder);
    CamelFolder *f;

    LOCAL_FOLDER_LOCK(mlf);
    f = mlf->real_folder;
    camel_object_ref((CamelObject *)f);
    LOCAL_FOLDER_UNLOCK(mlf);

    camel_folder_expunge(f, ex);
    camel_object_unref((CamelObject *)f);
}

static void
mlf_append_message(CamelFolder *folder, CamelMimeMessage *message, const CamelMessageInfo *info, CamelException *ex)
{
    MailLocalFolder *mlf = MAIL_LOCAL_FOLDER(folder);
    CamelFolder *f;

    LOCAL_FOLDER_LOCK(mlf);
    f = mlf->real_folder;
    camel_object_ref((CamelObject *)f);
    LOCAL_FOLDER_UNLOCK(mlf);

    camel_folder_append_message(f, message, info, ex);
    camel_object_unref((CamelObject *)f);
}

static CamelMimeMessage *
mlf_get_message(CamelFolder *folder, const char *uid, CamelException *ex)
{
    MailLocalFolder *mlf = MAIL_LOCAL_FOLDER(folder);
    CamelMimeMessage *ret;
    CamelFolder *f;

    LOCAL_FOLDER_LOCK(mlf);
    f = mlf->real_folder;
    camel_object_ref((CamelObject *)f);
    LOCAL_FOLDER_UNLOCK(mlf);

    ret = camel_folder_get_message(f, uid, ex);
    camel_object_unref((CamelObject *)f);

    return ret;
}

static GPtrArray *
mlf_search_by_expression(CamelFolder *folder, const char *expression, CamelException *ex)
{
    MailLocalFolder *mlf = MAIL_LOCAL_FOLDER (folder);
    GPtrArray *ret;
    CamelFolder *f;

    LOCAL_FOLDER_LOCK(mlf);
    f = mlf->real_folder;
    camel_object_ref((CamelObject *)f);
    LOCAL_FOLDER_UNLOCK(mlf);

    ret = camel_folder_search_by_expression(f, expression, ex);
    camel_object_unref((CamelObject *)f);

    return ret;
}

static void
mlf_search_free(CamelFolder *folder, GPtrArray *result)
{
    MailLocalFolder *mlf = MAIL_LOCAL_FOLDER(folder);
    CamelFolder *f;

    LOCAL_FOLDER_LOCK(mlf);
    f = mlf->real_folder;
    camel_object_ref((CamelObject *)f);
    LOCAL_FOLDER_UNLOCK(mlf);

    camel_folder_search_free(f, result);
    camel_object_unref((CamelObject *)f);
}

static void
mlf_set_message_flags(CamelFolder *folder, const char *uid, guint32 flags, guint32 set)
{
    MailLocalFolder *mlf = MAIL_LOCAL_FOLDER(folder);
    CamelFolder *f;

    LOCAL_FOLDER_LOCK(mlf);
    f = mlf->real_folder;
    camel_object_ref((CamelObject *)f);
    LOCAL_FOLDER_UNLOCK(mlf);

    camel_folder_set_message_flags(mlf->real_folder, uid, flags, set);
    camel_object_unref((CamelObject *)f);
}

static void
mlf_set_message_user_flag(CamelFolder *folder, const char *uid, const char *name, gboolean value)
{
    MailLocalFolder *mlf = MAIL_LOCAL_FOLDER(folder);
    CamelFolder *f;

    LOCAL_FOLDER_LOCK(mlf);
    f = mlf->real_folder;
    camel_object_ref((CamelObject *)f);
    LOCAL_FOLDER_UNLOCK(mlf);

    camel_folder_set_message_user_flag(mlf->real_folder, uid, name, value);
    camel_object_unref((CamelObject *)f);
}

static void
mlf_set_message_user_tag(CamelFolder *folder, const char *uid, const char *name, const char *value)
{
    MailLocalFolder *mlf = MAIL_LOCAL_FOLDER(folder);
    CamelFolder *f;

    LOCAL_FOLDER_LOCK(mlf);
    f = mlf->real_folder;
    camel_object_ref((CamelObject *)f);
    LOCAL_FOLDER_UNLOCK(mlf);

    camel_folder_set_message_user_tag(mlf->real_folder, uid, name, value);
    camel_object_unref((CamelObject *)f);
}

/* and, conversely, forward the real folder's signals. */

static void
mlf_proxy_message_changed(CamelObject *real_folder, gpointer event_data, gpointer user_data)
{
    camel_object_trigger_event((CamelObject *)user_data, "message_changed", event_data);
}

static void
mlf_proxy_folder_changed(CamelObject *real_folder, gpointer event_data, gpointer user_data)
{
    camel_object_trigger_event((CamelObject *)user_data, "folder_changed", event_data);
}

static void
mlf_unset_folder (MailLocalFolder *mlf)
{
    CamelFolder *folder = (CamelFolder *)mlf;

    g_assert(mlf->real_folder);

    camel_object_unhook_event(CAMEL_OBJECT(mlf->real_folder),
                  "message_changed",
                  mlf_proxy_message_changed,
                  mlf);
    camel_object_unhook_event(CAMEL_OBJECT(mlf->real_folder),
                  "folder_changed",
                  mlf_proxy_folder_changed,
                  mlf);

    camel_object_unref((CamelObject *)folder->summary);
    folder->summary = NULL;
    camel_object_unref((CamelObject *)mlf->real_folder);
    mlf->real_folder = NULL;
    camel_object_unref((CamelObject *)mlf->real_store);
    mlf->real_store = NULL;

    folder->permanent_flags = 0;
    folder->has_summary_capability = 0;
    folder->has_search_capability = 0;
}

static gboolean
mlf_set_folder(MailLocalFolder *mlf, guint32 flags, CamelException *ex)
{
    CamelFolder *folder = (CamelFolder *)mlf;
    char *uri;

    g_assert(mlf->real_folder == NULL);

    uri = g_strdup_printf("%s:%s%s", mlf->meta->format, ((CamelService *)folder->parent_store)->url->path, mlf->real_path);
    d(printf("opening real store: %s\n", uri));
    mlf->real_store = camel_session_get_store(session, uri, ex);
    g_free(uri);
    if (mlf->real_store == NULL)
        return FALSE;

    if (mlf->meta->indexed)
        flags |= CAMEL_STORE_FOLDER_BODY_INDEX;

    mlf->real_folder = camel_store_get_folder(mlf->real_store, mlf->meta->name, flags, ex);
    if (mlf->real_folder == NULL)
        return FALSE;

    if (mlf->real_folder->has_summary_capability) {
        folder->summary = mlf->real_folder->summary;
        camel_object_ref((CamelObject *)mlf->real_folder->summary);
    }

    folder->permanent_flags = mlf->real_folder->permanent_flags;
    folder->has_summary_capability = mlf->real_folder->has_summary_capability;
    folder->has_search_capability = mlf->real_folder->has_search_capability;

    camel_object_hook_event((CamelObject *)mlf->real_folder, "message_changed", mlf_proxy_message_changed, mlf);
    camel_object_hook_event((CamelObject *)mlf->real_folder, "folder_changed", mlf_proxy_folder_changed, mlf);

    return TRUE;
}

static void 
mlf_class_init (CamelObjectClass *camel_object_class)
{
    CamelFolderClass *camel_folder_class = CAMEL_FOLDER_CLASS (camel_object_class);

    /* override all the functions subclassed in providers/local/ */

    camel_folder_class->refresh_info = mlf_refresh_info;
    camel_folder_class->sync = mlf_sync;
    camel_folder_class->expunge = mlf_expunge;
    camel_folder_class->append_message = mlf_append_message;
    camel_folder_class->get_message = mlf_get_message;
    camel_folder_class->search_free = mlf_search_free;

    camel_folder_class->search_by_expression = mlf_search_by_expression;
    camel_folder_class->set_message_flags = mlf_set_message_flags;
    camel_folder_class->set_message_user_flag = mlf_set_message_user_flag;
    camel_folder_class->set_message_user_tag = mlf_set_message_user_tag;
}

static void
mlf_init (CamelObject *obj)
{
    MailLocalFolder *mlf = MAIL_LOCAL_FOLDER (obj);

#ifdef ENABLE_THREADS
    mlf->real_folder_lock = g_mutex_new();
#endif
}

static void
mlf_finalize (CamelObject *obj)
{
    MailLocalFolder *mlf = MAIL_LOCAL_FOLDER (obj);

    if (mlf->real_folder)
        mlf_unset_folder(mlf);

    free_metainfo(mlf->meta);
    
#ifdef ENABLE_THREADS
    g_mutex_free (mlf->real_folder_lock);
#endif
}

static CamelType
mail_local_folder_get_type (void)
{
    static CamelType mail_local_folder_type = CAMEL_INVALID_TYPE;

    if (mail_local_folder_type == CAMEL_INVALID_TYPE) {
        mail_local_folder_type = camel_type_register(CAMEL_FOLDER_TYPE,
                                 "MailLocalFolder",
                                 sizeof (MailLocalFolder),
                                 sizeof (MailLocalFolderClass),
                                 mlf_class_init,
                                 NULL,
                                 mlf_init,
                                 mlf_finalize);
    }

    return mail_local_folder_type;
}

static MailLocalFolder *
mail_local_folder_construct(MailLocalFolder *mlf, MailLocalStore  *parent_store, const char *full_name, CamelException *ex)
{
    const char *name;
    char *metapath;

    name = strrchr(full_name, '/');
    if (name == NULL)
        name = full_name;
    name = name + 1;

    d(printf("constructing local folder: full = %s, name = %s\n", full_name, name));

    camel_folder_construct(CAMEL_FOLDER (mlf), CAMEL_STORE(parent_store), full_name, name);

    mlf->real_path = g_strdup(((CamelFolder *)mlf)->full_name);

    metapath = g_strdup_printf("%s/%s/local-metadata.xml", ((CamelService *)parent_store)->url->path, full_name);
    mlf->meta = load_metainfo(metapath);
    g_free(metapath);

    return mlf;
}

static gboolean
mail_local_folder_reconfigure (MailLocalFolder *mlf, const char *new_format, CamelException *ex)
{
    CamelStore *fromstore = NULL;
    CamelFolder *fromfolder = NULL;
    char *oldformat = NULL;
    char *tmpname;
    char *store_uri;
    GPtrArray *uids;
    int real_folder_frozen = FALSE;

    camel_operation_start(NULL, _("Reconfiguring folder"));

    /* first things first */
    g_assert (ex);
    LOCAL_FOLDER_LOCK (mlf);

    /* first, 'close' the old folder */
    if (mlf->real_folder) {
        camel_folder_sync(mlf->real_folder, FALSE, ex);
        if (camel_exception_is_set (ex))
            goto cleanup;
        mlf_unset_folder(mlf);
    }

    store_uri = g_strdup_printf("%s:%s%s", mlf->meta->format,
                    ((CamelService *)((CamelFolder *)mlf)->parent_store)->url->path, mlf->real_path);
    fromstore = camel_session_get_store(session, store_uri, ex);
    g_free(store_uri);
    if (fromstore == NULL)
        goto cleanup;

    oldformat = mlf->meta->format;
    mlf->meta->format = g_strdup(new_format);

    /* rename the old mbox and open it again, without indexing */
    tmpname = g_strdup_printf ("%s_reconfig", mlf->meta->name);
    d(printf("renaming %s to %s, and opening it\n", mlf->meta->name, tmpname));
    
    camel_store_rename_folder(fromstore, mlf->meta->name, tmpname, ex);
    if (camel_exception_is_set(ex))
        goto cleanup;
    
    /* we dont need to set the create flag ... or need an index if it has one */
    fromfolder = camel_store_get_folder(fromstore, tmpname, 0, ex);
    if (fromfolder == NULL || camel_exception_is_set(ex)) {
        /* try and recover ... */
        camel_exception_clear(ex);
        camel_store_rename_folder(fromstore, tmpname, mlf->meta->name, ex);
        goto cleanup;
    }
    
    /* create a new mbox */
    d(printf("Creating the destination mbox\n"));

    if (!mlf_set_folder(mlf, CAMEL_STORE_FOLDER_CREATE, ex)) {
        d(printf("cannot open destination folder\n"));
        /* try and recover ... */
        camel_exception_clear(ex);
        camel_store_rename_folder(fromstore, tmpname, mlf->meta->name, ex);
        goto cleanup;
    }

    real_folder_frozen = TRUE;
    camel_folder_freeze(mlf->real_folder);

    uids = camel_folder_get_uids(fromfolder);
    camel_folder_move_messages_to(fromfolder, uids, mlf->real_folder, ex);
    camel_folder_free_uids(fromfolder, uids);
    if (camel_exception_is_set(ex))
        goto cleanup;
    
    camel_folder_expunge(fromfolder, ex);
    
    d(printf("delete old mbox ...\n"));
    camel_object_unref(CAMEL_OBJECT(fromfolder));
    fromfolder = NULL;
    camel_store_delete_folder(fromstore, tmpname, ex);
    
    /* switch format */
    g_free(oldformat);
    oldformat = NULL;
    if (save_metainfo(mlf->meta) == FALSE) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Cannot save folder metainfo; "
                    "you'll probably find you can't\n"
                    "open this folder anymore: %s: %s"),
                      mlf->meta->path, strerror(errno));
    }
    
 cleanup:
    if (oldformat) {
        g_free(mlf->meta->format);
        mlf->meta->format = oldformat;
    }
    if (mlf->real_folder == NULL)
        mlf_set_folder (mlf, CAMEL_STORE_FOLDER_CREATE, ex);
    if (fromfolder)
        camel_object_unref((CamelObject *)fromfolder);
    if (fromstore)
        camel_object_unref((CamelObject *)fromstore);

    LOCAL_FOLDER_UNLOCK (mlf);

    if (real_folder_frozen)
        camel_folder_thaw(mlf->real_folder);

    camel_operation_end(NULL);

    return !camel_exception_is_set(ex);
}
        
/* ******************************************************************************** */

static CamelObjectClass *local_store_parent_class = NULL;

static CamelFolder *
mls_get_folder(CamelStore *store, const char *folder_name, guint32 flags, CamelException *ex)
{
    MailLocalStore *local_store = MAIL_LOCAL_STORE (store);
    MailLocalFolder *folder;

    d(printf("--LOCAL-- get_folder: %s\n", folder_name));

    folder = (MailLocalFolder *)camel_object_new(MAIL_LOCAL_FOLDER_TYPE);
    folder = mail_local_folder_construct(folder, local_store, folder_name, ex);
    if (folder == NULL)
        return NULL;

    if (!mlf_set_folder(folder, flags, ex)) {
        camel_object_unref(CAMEL_OBJECT(folder));
        return NULL;
    }

    if (flags & CAMEL_STORE_FOLDER_CREATE) {
        if (save_metainfo(folder->meta) == -1) {
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("Cannot save folder metainfo to %s: %s"),
                          folder->meta->path, strerror(errno));
            camel_object_unref(CAMEL_OBJECT (folder));
            return NULL;
        }
    }

    return (CamelFolder *)folder;
}

static void
mls_delete_folder(CamelStore *store, const char *folder_name, CamelException *ex)
{
    CamelStore *real_store;
    char *metapath, *uri;
    CamelException local_ex;
    struct _local_meta *meta;

    d(printf("Deleting folder: %s %s\n", ((CamelService *)store)->url->path, folder_name));

    camel_exception_init(&local_ex);

    /* find the real store for this folder, and proxy the call */
    metapath = g_strdup_printf("%s%s/local-metadata.xml", ((CamelService *)store)->url->path, folder_name);
    meta = load_metainfo(metapath);
    uri = g_strdup_printf("%s:%s%s", meta->format, ((CamelService *)store)->url->path, folder_name);
    real_store = (CamelStore *)camel_session_get_service(session, uri, CAMEL_PROVIDER_STORE, ex);
    g_free(uri);
    if (real_store == NULL) {
        g_free(metapath);
        free_metainfo(meta);
        return;
    }

    camel_store_delete_folder(real_store, meta->name, &local_ex);
    if (camel_exception_is_set(&local_ex)) {
        camel_exception_xfer(ex, &local_ex);
        g_free(metapath);
        free_metainfo(meta);
        return;
    }

    free_metainfo(meta);

    if (unlink(metapath) == -1) {
        camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
                     _("Cannot delete folder metadata %s: %s"),
                     metapath, strerror(errno));
    }

    g_free(metapath);
}

static char *
mls_get_name (CamelService *service, gboolean brief)
{
    if (brief)
        return g_strdup("local");

    return g_strdup("Local mail folders");
}

static void
mls_init (MailLocalStore *mls, MailLocalStoreClass *mlsclass)
{
    mls->folder_infos = g_hash_table_new(g_str_hash, g_str_equal);
    mls->folder_info_lock = g_mutex_new();
}

static void
free_info(void *key, void *value, void *data)
{
    CamelFolderInfo *info = value;

    camel_folder_info_free (info);
}

static void
mls_finalise(MailLocalStore *mls)
{
    g_hash_table_foreach(mls->folder_infos, (GHFunc)free_info, NULL);
    g_hash_table_destroy(mls->folder_infos);
    g_mutex_free(mls->folder_info_lock);
}

static void
mls_class_init (CamelObjectClass *camel_object_class)
{
    CamelStoreClass *camel_store_class = CAMEL_STORE_CLASS(camel_object_class);
    CamelServiceClass *camel_service_class = CAMEL_SERVICE_CLASS(camel_object_class);
    
    /* virtual method overload -- the bare minimum */
    camel_service_class->get_name    = mls_get_name;
    camel_store_class->get_folder    = mls_get_folder;
    camel_store_class->delete_folder = mls_delete_folder;

    local_store_parent_class = camel_type_get_global_classfuncs (CAMEL_STORE_TYPE);
}

static CamelType
mail_local_store_get_type (void)
{
    static CamelType mail_local_store_type = CAMEL_INVALID_TYPE;

    if (mail_local_store_type == CAMEL_INVALID_TYPE) {
        mail_local_store_type = camel_type_register (
            CAMEL_STORE_TYPE, "MailLocalStore",
            sizeof (MailLocalStore),
            sizeof (MailLocalStoreClass),
            (CamelObjectClassInitFunc) mls_class_init,
            NULL,
            (CamelObjectInitFunc) mls_init,
            (CamelObjectFinalizeFunc) mls_finalise);
    }

    return mail_local_store_type;
}

static void mail_local_store_add_folder(MailLocalStore *mls, const char *uri, const char *path, const char *name)
{
    CamelFolderInfo *info = NULL;
    CamelURL *url;

    d(printf("Shell adding folder: '%s' path = '%s'\n", uri, path));

    url = camel_url_new(uri, NULL);
    if (url == NULL) {
        g_warning("Shell trying to add invalid folder url: %s", uri);
        return;
    }
    if (url->path == NULL || url->path[0] == 0) {
        g_warning("Shell trying to add invalid folder url: %s", uri);
        camel_url_free(url);
        return;
    }

    LOCAL_STORE_LOCK(mls);

    if (g_hash_table_lookup(mls->folder_infos, uri)) {
        g_warning("Shell trying to add a folder I already have!");
    } else {
        info = g_malloc0(sizeof(*info));
        info->url = g_strdup(uri);
        info->full_name = g_strdup(url->path+1);
        info->name = g_strdup(name);
        info->unread_message_count = -1;
        info->path = g_strdup (path);
        g_hash_table_insert(mls->folder_infos, info->url, info);
    }

    LOCAL_STORE_UNLOCK(mls);

    camel_url_free(url);

    if (info) {
        /* FIXME: should copy info, so we dont get a removed while we're using it? */
        camel_object_trigger_event((CamelObject *)mls, "folder_created", info);

        /* this is just so the folder is opened at least once to setup the folder
           counts etc in the display.  Joy eh?   The result is discarded. */
        mail_get_folder(uri, NULL, NULL, mail_thread_queued_slow);
    }
}

struct _search_info {
    const char *path;
    CamelFolderInfo *info;
};

static void
remove_find_path(char *uri, CamelFolderInfo *info, struct _search_info *data)
{
    if (!strcmp(info->path, data->path))
        data->info = info;
}

static void mail_local_store_remove_folder(MailLocalStore *mls, const char *path)
{
    struct _search_info data = { path, NULL };

    /* we're keyed on uri, not path, so have to search for it manually */

    LOCAL_STORE_LOCK(mls);
    g_hash_table_foreach(mls->folder_infos, (GHFunc)remove_find_path, &data);
    if (data.info)
        g_hash_table_remove(mls->folder_infos, data.info->url);
    LOCAL_STORE_UNLOCK(mls);

    if (data.info) {
        camel_object_trigger_event((CamelObject *)mls, "folder_deleted", data.info);

        g_free(data.info->url);
        g_free(data.info->full_name);
        g_free(data.info->name);
        g_free(data.info);
    }
}

/* ** Local Provider ************************************************************** */

static CamelProvider local_provider = {
    "file", "Local mail", NULL, "mail",
    CAMEL_PROVIDER_IS_STORAGE | CAMEL_PROVIDER_IS_EXTERNAL,
    CAMEL_URL_NEED_PATH,
    /* ... */
};

/* There's only one "file:" store. */
static guint
non_hash (gconstpointer key)
{
    return 0;
}

static gint
non_equal (gconstpointer a, gconstpointer b)
{
    return TRUE;
}

static void
mail_local_provider_init (void)
{
    /* Register with Camel to handle file: URLs */
    local_provider.object_types[CAMEL_PROVIDER_STORE] = MAIL_LOCAL_STORE_TYPE;

    local_provider.service_cache = g_hash_table_new (non_hash, non_equal);
    local_provider.url_hash = non_hash;
    local_provider.url_equal = non_equal;
    camel_session_register_provider (session, &local_provider);
}

/* ** Local Storage Listener ****************************************************** */

static void
local_storage_destroyed_cb (EvolutionStorageListener *storage_listener,
                void *data)
{
    CORBA_Environment ev;

    CORBA_exception_init (&ev);
    bonobo_object_release_unref (data, &ev);
    CORBA_exception_free (&ev);
}


static void
local_storage_new_folder_cb (EvolutionStorageListener *storage_listener,
                 const char *path,
                 const GNOME_Evolution_Folder *folder,
                 void *data)
{
    if (strcmp (folder->type, "mail") != 0)
        return;

    d(printf("Local folder new:\n"));
    d(printf(" path = '%s'\n uri = '%s'\n display = '%s'\n",
         path, folder->physicalUri, folder->displayName));

    mail_local_store_add_folder(global_local_store, folder->physicalUri, path, folder->displayName);

    /* are we supposed to say anything about it? */
}


static void
local_storage_removed_folder_cb (EvolutionStorageListener *storage_listener,
                 const char *path,
                 void *data)
{
    d(printf("Local folder remove:\n"));
    d(printf(" path = '%s'\n", path));

    mail_local_store_remove_folder(global_local_store, path);
}

static void
storage_listener_startup (EvolutionShellClient *shellclient)
{
    EvolutionStorageListener *local_storage_listener;
    GNOME_Evolution_StorageListener corba_local_storage_listener;
    GNOME_Evolution_Storage corba_storage;
    CORBA_Environment ev;

    d(printf("---- CALLING STORAGE LISTENER STARTUP ---\n"));

    local_corba_storage = corba_storage = evolution_shell_client_get_local_storage (shellclient);
    if (corba_storage == CORBA_OBJECT_NIL) {
        g_warning ("No local storage available from shell client!");
        return;
    }

    /* setup to record this store's changes */
    mail_note_store((CamelStore *)global_local_store, NULL, local_corba_storage, NULL, NULL);

    local_storage_listener = evolution_storage_listener_new ();
    corba_local_storage_listener = evolution_storage_listener_corba_objref (
        local_storage_listener);

    gtk_signal_connect (GTK_OBJECT (local_storage_listener),
                "destroyed",
                GTK_SIGNAL_FUNC (local_storage_destroyed_cb),
                corba_storage);
    gtk_signal_connect (GTK_OBJECT (local_storage_listener),
                "new_folder",
                GTK_SIGNAL_FUNC (local_storage_new_folder_cb),
                corba_storage);
    gtk_signal_connect (GTK_OBJECT (local_storage_listener),
                "removed_folder",
                GTK_SIGNAL_FUNC (local_storage_removed_folder_cb),
                corba_storage);

    CORBA_exception_init (&ev);
    GNOME_Evolution_Storage_addListener (corba_storage,
                         corba_local_storage_listener, &ev);
    if (ev._major != CORBA_NO_EXCEPTION) {
        g_warning ("Cannot add a listener to the Local Storage.");
        CORBA_exception_free (&ev);
        return;
    }
    CORBA_exception_free (&ev);
}

/* ** The rest ******************************************************************** */

void
mail_local_storage_startup (EvolutionShellClient *shellclient, const char *evolution_path)
{
    mail_local_provider_init ();

    global_local_store = MAIL_LOCAL_STORE(camel_session_get_service (session, "file:/", CAMEL_PROVIDER_STORE, NULL));

    if (!global_local_store) {
        g_warning ("No local store!");
        return;
    }

    storage_listener_startup (shellclient);
}


/*----------------------------------------------------------------------
 * Local folder reconfiguration stuff
 *----------------------------------------------------------------------*/

/*
   open new
   copy old->new
   close old
   rename old oldsave
   rename new old
   open oldsave
   delete oldsave

   close old
   rename oldtmp
   open new
   open oldtmp
   copy oldtmp new
   close oldtmp
   close oldnew

*/

/* we should have our own progress bar for this */

struct _reconfigure_msg {
    struct _mail_msg msg;

    FolderBrowser *fb;
    char *newtype;
    GtkWidget *frame;
    GtkWidget *apply;
    GtkWidget *cancel;
    GtkOptionMenu *optionlist;
    CamelFolder *folder_out;
};

/* hash table of folders that the user has a reconfig-folder dialog for */
static GHashTable *reconfigure_folder_hash = NULL;

static char *
reconfigure_folder_describe (struct _mail_msg *mm, int done)
{
    struct _reconfigure_msg *m = (struct _reconfigure_msg *)mm;
    
    return g_strdup_printf (_("Changing folder \"%s\" to \"%s\" format"),
                m->fb->uri,
                m->newtype);
}

static void
reconfigure_folder_reconfigure (struct _mail_msg *mm)
{
    struct _reconfigure_msg *m = (struct _reconfigure_msg *)mm;
    CamelFolder *local_folder = NULL;

    d(printf("reconfiguring folder: %s to type %s\n", m->fb->uri, m->newtype));
    
    if (strncmp (m->fb->uri, "file:", 5)) {
        camel_exception_setv (&mm->ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE,
                      _("%s may not be reconfigured because it is not a local folder"), 
                      m->fb->uri);
        return;
    }

    local_folder = mail_tool_uri_to_folder (m->fb->uri, &mm->ex);
    if (camel_exception_is_set (&mm->ex)) {
        g_warning ("Can't resolve URI \"%s\" for reconfiguration!", m->fb->uri);
        return;
    }

    mail_local_folder_reconfigure (MAIL_LOCAL_FOLDER (local_folder), m->newtype, &mm->ex);
    m->folder_out = local_folder;
}

static void
reconfigure_folder_reconfigured (struct _mail_msg *mm)
{
    struct _reconfigure_msg *m = (struct _reconfigure_msg *)mm;
    /*char *uri;*/
    
    if (camel_exception_is_set (&mm->ex)) {
        gnome_error_dialog (_("If you can no longer open this mailbox, then\n"
                      "you may need to repair it manually."));
    }

    message_list_set_folder (m->fb->message_list, m->folder_out, FALSE);
}

static void
reconfigure_folder_free (struct _mail_msg *mm)
{
    struct _reconfigure_msg *m = (struct _reconfigure_msg *)mm;

    /* remove this folder from our hash since we are done with it */
    g_hash_table_remove (reconfigure_folder_hash, m->fb->folder);
    if (g_hash_table_size (reconfigure_folder_hash) == 0) {
        /* additional cleanup */
        g_hash_table_destroy (reconfigure_folder_hash);
        reconfigure_folder_hash = NULL;
    }

    if (m->folder_out)
        camel_object_unref (CAMEL_OBJECT (m->folder_out));
    gtk_object_unref (GTK_OBJECT (m->fb));
    g_free (m->newtype);
}

static struct _mail_msg_op reconfigure_folder_op = {
    reconfigure_folder_describe,
    reconfigure_folder_reconfigure,
    reconfigure_folder_reconfigured,
    reconfigure_folder_free,
};

static void
reconfigure_clicked (GnomeDialog *dialog, int button, struct _reconfigure_msg *m)
{
    if (button == 0) {
        GtkWidget *menu, *item;
        
        /* hack to clear the message list during update */
        /* we need to do this because the message list caches
         * CamelMessageInfos from the old folder. */
        message_list_set_folder(m->fb->message_list, NULL, FALSE);
        
        menu = gtk_option_menu_get_menu(m->optionlist);
        item = gtk_menu_get_active(GTK_MENU(menu));
        m->newtype = g_strdup(gtk_object_get_data((GtkObject *)item, "type"));

        gtk_widget_set_sensitive (m->frame, FALSE);
        gtk_widget_set_sensitive (m->apply, FALSE);
        gtk_widget_set_sensitive (m->cancel, FALSE);
        
        e_thread_put (mail_thread_queued, (EMsg *)m);
    } else
        mail_msg_free ((struct _mail_msg *)m);
    
    if (button != -1)
        gnome_dialog_close (dialog);
}

void
mail_local_reconfigure_folder (FolderBrowser *fb)
{
    GladeXML *gui;
    GnomeDialog *gd;
    struct _reconfigure_msg *m;
    char *title;
    GList *p;
    GtkWidget *menu;
    char *currentformat;
    int index=0, history=0;

    if (fb->folder == NULL) {
        g_warning ("Trying to reconfigure nonexistant folder");
        return;
    }
    
    if (!reconfigure_folder_hash)
        reconfigure_folder_hash = g_hash_table_new (NULL, NULL);
    
    if ((gd = g_hash_table_lookup (reconfigure_folder_hash, fb->folder))) {
        gdk_window_raise (GTK_WIDGET (gd)->window);
        return;
    }
    
    /* check if we can work on this folder */
    if (!MAIL_IS_LOCAL_FOLDER (fb->folder)) {
        e_notice (NULL, GNOME_MESSAGE_BOX_WARNING,
              _("You cannot change the format of a non-local folder."));
        return;
    }
    
    m = mail_msg_new (&reconfigure_folder_op, NULL, sizeof (*m));
    
    gui = glade_xml_new (EVOLUTION_GLADEDIR "/local-config.glade", "dialog_format");
    gd = (GnomeDialog *)glade_xml_get_widget (gui, "dialog_format");
    
    title = g_strdup_printf (_("Reconfigure /%s"),
                 camel_folder_get_full_name (fb->folder));
    gtk_window_set_title (GTK_WINDOW (gd), title);
    g_free (title);
    
    m->frame = glade_xml_get_widget (gui, "frame_format");
    m->apply = glade_xml_get_widget (gui, "apply_format");
    m->cancel = glade_xml_get_widget (gui, "cancel_format");
    m->optionlist = (GtkOptionMenu *)glade_xml_get_widget (gui, "option_format");
    m->newtype = NULL;
    m->fb = fb;
    m->folder_out = NULL;
    gtk_object_ref (GTK_OBJECT (fb));

    /* dynamically create the folder type list from camel */
    /* we assume the list is static and never freed */
    currentformat = MAIL_LOCAL_FOLDER (fb->folder)->meta->format;
    p = camel_session_list_providers(session, TRUE);
    menu = gtk_menu_new();
    while (p) {
        CamelProvider *cp = p->data;

        /* we only want local providers */
        if (cp->flags & CAMEL_PROVIDER_IS_LOCAL) {
            GtkWidget *item;
            char *label;

            if (strcmp(cp->protocol, currentformat) == 0)
                history = index;

            label = g_strdup_printf("%s (%s)", cp->protocol, _(cp->name));
            item = gtk_menu_item_new_with_label(label);
            g_free(label);
            gtk_object_set_data((GtkObject *)item, "type", cp->protocol);
            gtk_widget_show(item);
            gtk_menu_append(GTK_MENU(menu), item);
            index++;
        }
        p = p->next;
    }
    gtk_option_menu_remove_menu (GTK_OPTION_MENU(m->optionlist));
    gtk_option_menu_set_menu (GTK_OPTION_MENU(m->optionlist), menu);
    gtk_option_menu_set_history(GTK_OPTION_MENU(m->optionlist), history);

    gtk_label_set_text ((GtkLabel *)glade_xml_get_widget (gui, "label_format"),
                MAIL_LOCAL_FOLDER (fb->folder)->meta->format);
    
    gtk_signal_connect (GTK_OBJECT (gd), "clicked", reconfigure_clicked, m);
    gtk_object_unref (GTK_OBJECT (gui));
    
    g_hash_table_insert (reconfigure_folder_hash, (gpointer) fb->folder, (gpointer) gd);
    
    gnome_dialog_run (GNOME_DIALOG (gd));
}