Set errno to 0 before doing disk I/O to prevent confusing error

[geany-mirror.git] / src / document.c

/*
 *      document.c - this file is part of Geany, a fast and lightweight IDE
 *
 *      Copyright 2005-2010 Enrico Tröger <enrico(dot)troeger(at)uvena(dot)de>
 *      Copyright 2006-2010 Nick Treleaven <nick(dot)treleaven(at)btinternet(dot)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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $Id$
 */

/*
 *  Document related actions: new, save, open, etc.
 *  Also Scintilla search actions.
 */

#include "geany.h"

#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <time.h>

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

#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif

#include <stdlib.h>

/* gstdio.h also includes sys/stat.h */
#include <glib/gstdio.h>

/* uncomment to use GIO based file monitoring, though it is not completely stable yet */
/*#define USE_GIO_FILEMON 1*/
#ifdef HAVE_GIO
# include <gio/gio.h>
#else
# if USE_GIO_FILEMON
#  undef USE_GIO_FILEMON
# endif
#endif

#include "document.h"
#include "documentprivate.h"
#include "filetypes.h"
#include "support.h"
#include "sciwrappers.h"
#include "editor.h"
#include "dialogs.h"
#include "msgwindow.h"
#include "templates.h"
#include "sidebar.h"
#include "ui_utils.h"
#include "utils.h"
#include "encodings.h"
#include "notebook.h"
#include "main.h"
#include "vte.h"
#include "build.h"
#include "symbols.h"
#include "highlighting.h"
#include "navqueue.h"
#include "win32.h"
#include "search.h"
#include "filetypesprivate.h"


GeanyFilePrefs file_prefs;

/** Dynamic array of GeanyDocument pointers holding information about the notebook tabs.
 * Once a pointer is added to this, it is never freed. This means you can keep a pointer
 * to a document over time, but it might no longer represent a notebook tab. To check this,
 * check @c doc_ptr->is_valid. Of course, the pointer may represent a different
 * file by then.
 *
 * You also need to check @c GeanyDocument::is_valid when iterating over this array,
 * although usually you would just use the foreach_document() macro.
 *
 * Never assume that the order of document pointers is the same as the order of notebook tabs.
 * Notebook tabs can be reordered. Use @c document_get_from_page(). */
GPtrArray *documents_array = NULL;


/* an undo action, also used for redo actions */
typedef struct
{
        GTrashStack *next;      /* pointer to the next stack element(required for the GTrashStack) */
        guint type;                     /* to identify the action */
        gpointer *data;         /* the old value (before the change), in case of a redo action
                                                 * it contains the new value */
} undo_action;


static void document_undo_clear(GeanyDocument *doc);
static void document_redo_add(GeanyDocument *doc, guint type, gpointer data);
static gboolean update_tags_from_buffer(GeanyDocument *doc);


/* ignore the case of filenames and paths under WIN32, causes errors if not */
#ifdef G_OS_WIN32
#define filenamecmp(a, b)       utils_str_casecmp((a), (b))
#else
#define filenamecmp(a, b)       strcmp((a), (b))
#endif

/**
 * Finds a document whose @c real_path field matches the given filename.
 *
 * @param realname The filename to search, which should be identical to the
 * string returned by @c tm_get_real_path().
 *
 * @return The matching document, or @c NULL.
 * @note This is only really useful when passing a @c TMWorkObject::file_name.
 * @see GeanyDocument::real_path.
 * @see document_find_by_filename().
 *
 * @since 0.15
 **/
GeanyDocument* document_find_by_real_path(const gchar *realname)
{
        guint i;

        if (! realname)
                return NULL;    /* file doesn't exist on disk */

        for (i = 0; i < documents_array->len; i++)
        {
                GeanyDocument *doc = documents[i];

                if (! doc->is_valid || G_UNLIKELY(! doc->real_path))
                        continue;

                if (filenamecmp(realname, doc->real_path) == 0)
                {
                        return doc;
                }
        }
        return NULL;
}


/* dereference symlinks, /../ junk in path and return locale encoding */
static gchar *get_real_path_from_utf8(const gchar *utf8_filename)
{
        gchar *locale_name = utils_get_locale_from_utf8(utf8_filename);
        gchar *realname = tm_get_real_path(locale_name);

        g_free(locale_name);
        return realname;
}


/**
 *  Finds a document with the given filename.
 *  This matches either an exact GeanyDocument::file_name string, or variant
 *  filenames with relative elements in the path (e.g. @c "/dir/..//name" will
 *  match @c "/name").
 *
 *  @param utf8_filename The filename to search (in UTF-8 encoding).
 *
 *  @return The matching document, or @c NULL.
 *  @see document_find_by_real_path().
 **/
GeanyDocument *document_find_by_filename(const gchar *utf8_filename)
{
        guint i;
        GeanyDocument *doc;
        gchar *realname;

        g_return_val_if_fail(utf8_filename != NULL, NULL);

        /* First search GeanyDocument::file_name, so we can find documents with a
         * filename set but not saved on disk, like vcdiff produces */
        for (i = 0; i < documents_array->len; i++)
        {
                doc = documents[i];

                if (! doc->is_valid || G_UNLIKELY(doc->file_name == NULL))
                        continue;

                if (filenamecmp(utf8_filename, doc->file_name) == 0)
                {
                        return doc;
                }
        }
        /* Now try matching based on the realpath(), which is unique per file on disk */
        realname = get_real_path_from_utf8(utf8_filename);
        doc = document_find_by_real_path(realname);
        g_free(realname);
        return doc;
}


/* returns the document which has sci, or NULL. */
GeanyDocument *document_find_by_sci(ScintillaObject *sci)
{
        guint i;

        g_return_val_if_fail(sci != NULL, NULL);

        for (i = 0; i < documents_array->len; i++)
        {
                if (documents[i]->is_valid && documents[i]->editor->sci == sci)
                        return documents[i];
        }
        return NULL;
}


/** Gets the notebook page index for a document.
 * @param doc The document.
 * @return The index.
 * @since 0.19 */
gint document_get_notebook_page(GeanyDocument *doc)
{
        g_return_val_if_fail(doc != NULL, -1);

        return gtk_notebook_page_num(GTK_NOTEBOOK(main_widgets.notebook),
                GTK_WIDGET(doc->editor->sci));
}


/**
 *  Finds the document for the given notebook page @a page_num.
 *
 *  @param page_num The notebook page number to search.
 *
 *  @return The corresponding document for the given notebook page, or @c NULL.
 **/
GeanyDocument *document_get_from_page(guint page_num)
{
        ScintillaObject *sci;

        if (page_num >= documents_array->len)
                return NULL;

        sci = (ScintillaObject*)gtk_notebook_get_nth_page(
                                GTK_NOTEBOOK(main_widgets.notebook), page_num);

        return document_find_by_sci(sci);
}


/**
 *  Finds the current document.
 *
 *  @return A pointer to the current document or @c NULL if there are no opened documents.
 **/
GeanyDocument *document_get_current(void)
{
        gint cur_page = gtk_notebook_get_current_page(GTK_NOTEBOOK(main_widgets.notebook));

        if (cur_page == -1)
                return NULL;
        else
        {
                ScintillaObject *sci = (ScintillaObject*)
                        gtk_notebook_get_nth_page(GTK_NOTEBOOK(main_widgets.notebook), cur_page);

                return document_find_by_sci(sci);
        }
}


void document_init_doclist()
{
        documents_array = g_ptr_array_new();
}


void document_finalize()
{
        g_ptr_array_free(documents_array, TRUE);
}


/**
 *  Returns the last part of the filename of the given GeanyDocument. The result is also
 *  truncated to a maximum of @a length characters in case the filename is very long.
 *
 *  @param doc The document to use.
 *  @param length The length of the resulting string or -1 to use a default value.
 *
 *  @return The ellipsized last part of the filename of @a doc, should be freed when no
 *          longer needed.
 *
 *  @since 0.17
 */
/* TODO make more use of this */
gchar *document_get_basename_for_display(GeanyDocument *doc, gint length)
{
        gchar *base_name, *short_name;

        g_return_val_if_fail(doc != NULL, NULL);

        if (length < 0)
                length = 30;

        base_name = g_path_get_basename(DOC_FILENAME(doc));
        short_name = utils_str_middle_truncate(base_name, length);

        g_free(base_name);

        return short_name;
}


void document_update_tab_label(GeanyDocument *doc)
{
        gchar *short_name;
        GtkWidget *parent;

        g_return_if_fail(doc != NULL);

        short_name = document_get_basename_for_display(doc, -1);

        /* we need to use the event box for the tooltip, labels don't get the necessary events */
        parent = gtk_widget_get_parent(doc->priv->tab_label);
        parent = gtk_widget_get_parent(parent);

        gtk_label_set_text(GTK_LABEL(doc->priv->tab_label), short_name);

        ui_widget_set_tooltip_text(parent, DOC_FILENAME(doc));

        g_free(short_name);
}


/**
 *  Updates the tab labels, the status bar, the window title and some save-sensitive buttons
 *  according to the document's save state.
 *  This is called by Geany mostly when opening or saving files.
 *
 * @param doc The document to use.
 * @param changed Whether the document state should indicate changes have been made.
 **/
void document_set_text_changed(GeanyDocument *doc, gboolean changed)
{
        g_return_if_fail(doc != NULL);

        doc->changed = changed;

        if (! main_status.quitting)
        {
                ui_update_tab_status(doc);
                ui_save_buttons_toggle(changed);
                ui_set_window_title(doc);
                ui_update_statusbar(doc, -1);
        }
}


/* Sets is_valid to FALSE and initializes some members to NULL, to mark it uninitialized.
 * The flag is_valid is set to TRUE in document_create(). */
static void init_doc_struct(GeanyDocument *new_doc)
{
        GeanyDocumentPrivate *priv;

        memset(new_doc, 0, sizeof(GeanyDocument));

        new_doc->is_valid = FALSE;
        new_doc->has_tags = FALSE;
        new_doc->readonly = FALSE;
        new_doc->file_name = NULL;
        new_doc->file_type = NULL;
        new_doc->tm_file = NULL;
        new_doc->encoding = NULL;
        new_doc->has_bom = FALSE;
        new_doc->editor = NULL;
        new_doc->changed = FALSE;
        new_doc->real_path = NULL;

        new_doc->priv = g_new0(GeanyDocumentPrivate, 1);
        priv = new_doc->priv;
        priv->tag_store = NULL;
        priv->tag_tree = NULL;
        priv->saved_encoding.encoding = NULL;
        priv->saved_encoding.has_bom = FALSE;
        priv->undo_actions = NULL;
        priv->redo_actions = NULL;
        priv->line_count = 0;
#if ! defined(USE_GIO_FILEMON)
        priv->last_check = time(NULL);
#endif
}


/* returns the next free place in the document list,
 * or -1 if the documents_array is full */
static gint document_get_new_idx(void)
{
        guint i;

        for (i = 0; i < documents_array->len; i++)
        {
                if (documents[i]->editor == NULL)
                {
                        return (gint) i;
                }
        }
        return -1;
}


static void queue_colourise(GeanyDocument *doc)
{
        /* Colourise the editor before it is next drawn */
        doc->priv->colourise_needed = TRUE;

        /* If the editor doesn't need drawing (e.g. after saving the current
         * document), we need to force a redraw, so the expose event is triggered.
         * This ensures we don't start colourising before all documents are opened/saved,
         * only once the editor is drawn. */
        gtk_widget_queue_draw(GTK_WIDGET(doc->editor->sci));
}


#if USE_GIO_FILEMON
static void monitor_file_changed_cb(G_GNUC_UNUSED GFileMonitor *monitor, G_GNUC_UNUSED GFile *file,
                                                                        G_GNUC_UNUSED GFile *other_file, GFileMonitorEvent event,
                                                                        GeanyDocument *doc)
{
        g_return_if_fail(doc != NULL);

        if (file_prefs.disk_check_timeout == 0)
                return;

        geany_debug("%s: event: %d previous file status: %d",
                G_STRFUNC, event, doc->priv->file_disk_status);
        switch (event)
        {
                case G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT:
                {
                        if (doc->priv->file_disk_status == FILE_IGNORE)
                                doc->priv->file_disk_status = FILE_OK;
                        else
                                doc->priv->file_disk_status = FILE_CHANGED;
                        g_message("%s: FILE_CHANGED", G_STRFUNC);
                        break;
                }
                case G_FILE_MONITOR_EVENT_DELETED:
                {
                        doc->priv->file_disk_status = FILE_CHANGED;
                        g_message("%s: FILE_MISSING", G_STRFUNC);
                        break;
                }
                default:
                        break;
        }
        if (doc->priv->file_disk_status != FILE_OK)
        {
                ui_update_tab_status(doc);
        }
}
#endif


static void document_stop_file_monitoring(GeanyDocument *doc)
{
        g_return_if_fail(doc != NULL);

        if (doc->priv->monitor != NULL)
        {
                g_object_unref(doc->priv->monitor);
                doc->priv->monitor = NULL;
        }
}


static void monitor_file_setup(GeanyDocument *doc)
{
        g_return_if_fail(doc != NULL);
        /* Disable file monitoring completely for remote files (i.e. remote GIO files) as GFileMonitor
         * doesn't work at all for remote files and legacy polling is too slow. */
        if (! doc->priv->is_remote)
        {
#if USE_GIO_FILEMON
                gchar *locale_filename;

                /* stop any previous monitoring */
                document_stop_file_monitoring(doc);

                locale_filename = utils_get_locale_from_utf8(doc->file_name);
                if (locale_filename != NULL && g_file_test(locale_filename, G_FILE_TEST_EXISTS))
                {
                        /* get a file monitor and connect to the 'changed' signal */
                        GFile *file = g_file_new_for_path(locale_filename);
                        doc->priv->monitor = g_file_monitor_file(file, G_FILE_MONITOR_NONE, NULL, NULL);
                        g_signal_connect(doc->priv->monitor, "changed",
                                G_CALLBACK(monitor_file_changed_cb), doc);

                        /* we set the rate limit according to the GUI pref but it's most probably not used */
                        g_file_monitor_set_rate_limit(doc->priv->monitor, file_prefs.disk_check_timeout * 1000);

                        g_object_unref(file);
                }
                g_free(locale_filename);
#endif
        }
        doc->priv->file_disk_status = FILE_OK;
}


void document_try_focus(GeanyDocument *doc, GtkWidget *source_widget)
{
        /* doc might not be valid e.g. if user closed a tab whilst Geany is opening files */
        if (DOC_VALID(doc))
        {
                GtkWidget *sci = GTK_WIDGET(doc->editor->sci);
                GtkWidget *focusw = gtk_window_get_focus(GTK_WINDOW(main_widgets.window));

                if (source_widget == NULL)
                        source_widget = doc->priv->tag_tree;

                if (focusw == source_widget)
                        gtk_widget_grab_focus(sci);
        }
}


static gboolean on_idle_focus(gpointer doc)
{
        document_try_focus(doc, NULL);
        return FALSE;
}


static gboolean remove_page(guint page_num);

/* Creates a new document and editor, adding a tab in the notebook.
 * @return The created document */
static GeanyDocument *document_create(const gchar *utf8_filename)
{
        GeanyDocument *doc;
        gint new_idx;
        gint cur_pages = gtk_notebook_get_n_pages(GTK_NOTEBOOK(main_widgets.notebook));

        if (cur_pages == 1)
        {
                GeanyDocument *cur = document_get_current();
                /* remove the empty document first */
                if (cur != NULL && cur->file_name == NULL && ! cur->changed)
                        /* prevent immediately opening another new doc with
                         * new_document_after_close pref */
                        remove_page(0);
        }

        new_idx = document_get_new_idx();
        if (new_idx == -1)      /* expand the array, no free places */
        {
                GeanyDocument *new_doc = g_new0(GeanyDocument, 1);

                new_idx = documents_array->len;
                g_ptr_array_add(documents_array, new_doc);
        }
        doc = documents[new_idx];
        init_doc_struct(doc);   /* initialize default document settings */
        doc->index = new_idx;

        doc->file_name = g_strdup(utf8_filename);

        doc->editor = editor_create(doc);

        sidebar_openfiles_add(doc);     /* sets doc->iter */

        notebook_new_tab(doc);

        /* select document in sidebar */
        {
                GtkTreeSelection *sel;

                sel = gtk_tree_view_get_selection(GTK_TREE_VIEW(tv.tree_openfiles));
                gtk_tree_selection_select_iter(sel, &doc->priv->iter);
        }

        ui_document_buttons_update();

        doc->is_valid = TRUE;   /* do this last to prevent UI updating with NULL items. */
        return doc;
}


/**
 *  Closes the given document.
 *
 *  @param doc The document to remove.
 *
 *  @return @c TRUE if the document was actually removed or @c FALSE otherwise.
 *
 * @since 0.15
 **/
gboolean document_close(GeanyDocument *doc)
{
        g_return_val_if_fail(doc, FALSE);

        return document_remove_page(document_get_notebook_page(doc));
}


/* Call document_remove_page() instead, this is only needed for document_create(). */
static gboolean remove_page(guint page_num)
{
        GeanyDocument *doc = document_get_from_page(page_num);

        if (G_UNLIKELY(doc == NULL))
        {
                g_warning("%s: page_num: %d", G_STRFUNC, page_num);
                return FALSE;
        }

        if (doc->changed && ! dialogs_show_unsaved_file(doc))
        {
                return FALSE;
        }

        /* tell any plugins that the document is about to be closed */
        g_signal_emit_by_name(geany_object, "document-close", doc);

        /* Checking real_path makes it likely the file exists on disk */
        if (! main_status.closing_all && doc->real_path != NULL)
                ui_add_recent_file(doc->file_name);

        doc->is_valid = FALSE;

        if (! main_status.quitting)
        {
                notebook_remove_page(page_num);
                sidebar_remove_document(doc);
                navqueue_remove_file(doc->file_name);
                msgwin_status_add(_("File %s closed."), DOC_FILENAME(doc));
        }
        g_free(doc->encoding);
        g_free(doc->priv->saved_encoding.encoding);
        g_free(doc->file_name);
        g_free(doc->real_path);
        tm_workspace_remove_object(doc->tm_file, TRUE, TRUE);

        editor_destroy(doc->editor);
        doc->editor = NULL;

        document_stop_file_monitoring(doc);

        doc->file_name = NULL;
        doc->real_path = NULL;
        doc->file_type = NULL;
        doc->encoding = NULL;
        doc->has_bom = FALSE;
        doc->tm_file = NULL;
        document_undo_clear(doc);
        g_free(doc->priv);

        if (gtk_notebook_get_n_pages(GTK_NOTEBOOK(main_widgets.notebook)) == 0)
        {
                sidebar_update_tag_list(NULL, FALSE);
                /*on_notebook1_switch_page(GTK_NOTEBOOK(main_widgets.notebook), NULL, 0, NULL);*/
                ui_set_window_title(NULL);
                ui_save_buttons_toggle(FALSE);
                ui_update_popup_reundo_items(NULL);
                ui_document_buttons_update();
                build_menu_update(NULL);
        }
        return TRUE;
}


/**
 *  Removes the given notebook tab at @a page_num and clears all related information
 *  in the document list.
 *
 *  @param page_num The notebook page number to remove.
 *
 *  @return @c TRUE if the document was actually removed or @c FALSE otherwise.
 **/
gboolean document_remove_page(guint page_num)
{
        gboolean done = remove_page(page_num);

        if (done && ui_prefs.new_document_after_close)
                document_new_file_if_non_open();

        return done;
}


/* used to keep a record of the unchanged document state encoding */
static void store_saved_encoding(GeanyDocument *doc)
{
        g_free(doc->priv->saved_encoding.encoding);
        doc->priv->saved_encoding.encoding = g_strdup(doc->encoding);
        doc->priv->saved_encoding.has_bom = doc->has_bom;
}


/* Opens a new empty document only if there are no other documents open */
GeanyDocument *document_new_file_if_non_open(void)
{
        if (gtk_notebook_get_n_pages(GTK_NOTEBOOK(main_widgets.notebook)) == 0)
                return document_new_file(NULL, NULL, NULL);

        return NULL;
}


/**
 *  Creates a new document.
 *  Line endings in @a text will be converted to the default setting.
 *  Afterwards, the @c "document-new" signal is emitted for plugins.
 *
 *  @param utf8_filename The file name in UTF-8 encoding, or @c NULL to open a file as "untitled".
 *  @param ft The filetype to set or @c NULL to detect it from @a filename if not @c NULL.
 *  @param text The initial content of the file (in UTF-8 encoding), or @c NULL.
 *
 *  @return The new document.
 **/
GeanyDocument *document_new_file(const gchar *utf8_filename, GeanyFiletype *ft, const gchar *text)
{
        GeanyDocument *doc;

        if (utf8_filename && g_path_is_absolute(utf8_filename))
        {
                gchar *tmp;
                tmp = utils_strdupa(utf8_filename);     /* work around const */
                utils_tidy_path(tmp);
                utf8_filename = tmp;
        }
        doc = document_create(utf8_filename);

        g_assert(doc != NULL);

        sci_set_undo_collection(doc->editor->sci, FALSE); /* avoid creation of an undo action */
        if (text)
        {
                GString *template = g_string_new(text);
                utils_ensure_same_eol_characters(template, file_prefs.default_eol_character);

                sci_set_text(doc->editor->sci, template->str);
                g_string_free(template, TRUE);
        }
        else
                sci_clear_all(doc->editor->sci);

        sci_set_eol_mode(doc->editor->sci, file_prefs.default_eol_character);

        sci_set_undo_collection(doc->editor->sci, TRUE);
        sci_empty_undo_buffer(doc->editor->sci);

        doc->encoding = g_strdup(encodings[file_prefs.default_new_encoding].charset);
        /* store the opened encoding for undo/redo */
        store_saved_encoding(doc);

        if (ft == NULL && utf8_filename != NULL) /* guess the filetype from the filename if one is given */
                ft = filetypes_detect_from_document(doc);

        document_set_filetype(doc, ft); /* also clears taglist */

        ui_set_window_title(doc);
        build_menu_update(doc);
        document_update_tag_list(doc, FALSE);
        document_set_text_changed(doc, FALSE);
        ui_document_show_hide(doc); /* update the document menu */

        sci_set_line_numbers(doc->editor->sci, editor_prefs.show_linenumber_margin, 0);
        /* bring it in front, jump to the start and grab the focus */
        editor_goto_pos(doc->editor, 0, FALSE);
        document_try_focus(doc, NULL);

#if USE_GIO_FILEMON
        monitor_file_setup(doc);
#else
        doc->priv->mtime = time(NULL);
#endif

        /* "the" SCI signal (connect after initial setup(i.e. adding text)) */
        g_signal_connect(doc->editor->sci, "sci-notify", G_CALLBACK(editor_sci_notify_cb), doc->editor);

        g_signal_emit_by_name(geany_object, "document-new", doc);

        msgwin_status_add(_("New file \"%s\" opened."),
                DOC_FILENAME(doc));

        return doc;
}


/**
 *  Opens a document specified by @a locale_filename.
 *  Afterwards, the @c "document-open" signal is emitted for plugins.
 *
 *  @param locale_filename The filename of the document to load, in locale encoding.
 *  @param readonly Whether to open the document in read-only mode.
 *  @param ft The filetype for the document or @c NULL to auto-detect the filetype.
 *  @param forced_enc The file encoding to use or @c NULL to auto-detect the file encoding.
 *
 *  @return The document opened or @c NULL.
 **/
GeanyDocument *document_open_file(const gchar *locale_filename, gboolean readonly,
                GeanyFiletype *ft, const gchar *forced_enc)
{
        return document_open_file_full(NULL, locale_filename, 0, readonly, ft, forced_enc);
}


typedef struct
{
        gchar           *data;  /* null-terminated file data */
        gsize            size;  /* actual file size on disk */
        gsize            len;   /* string length of data */
        gchar           *enc;
        gboolean         bom;
        time_t           mtime; /* modification time, read by stat::st_mtime */
        gboolean         readonly;
} FileData;


/* reload file with specified encoding */
static gboolean
handle_forced_encoding(FileData *filedata, const gchar *forced_enc)
{
        GeanyEncodingIndex enc_idx;

        if (utils_str_equal(forced_enc, "UTF-8"))
        {
                if (! g_utf8_validate(filedata->data, filedata->len, NULL))
                {
                        return FALSE;
                }
        }
        else
        {
                gchar *converted_text = encodings_convert_to_utf8_from_charset(
                                                                                filedata->data, filedata->size, forced_enc, FALSE);
                if (converted_text == NULL)
                {
                        return FALSE;
                }
                else
                {
                        g_free(filedata->data);
                        filedata->data = converted_text;
                        filedata->len = strlen(converted_text);
                }
        }
        enc_idx = encodings_scan_unicode_bom(filedata->data, filedata->size, NULL);
        filedata->bom = (enc_idx == GEANY_ENCODING_UTF_8);
        filedata->enc = g_strdup(forced_enc);
        return TRUE;
}


/* detect encoding and convert to UTF-8 if necessary */
static gboolean
handle_encoding(FileData *filedata, GeanyEncodingIndex enc_idx)
{
        g_return_val_if_fail(filedata->enc == NULL, FALSE);
        g_return_val_if_fail(filedata->bom == FALSE, FALSE);

        if (filedata->size == 0)
        {
                /* we have no data so assume UTF-8, filedata->len can be 0 even we have an empty
                 * e.g. UTF32 file with a BOM(so size is 4, len is 0) */
                filedata->enc = g_strdup("UTF-8");
        }
        else
        {
                /* first check for a BOM */
                if (enc_idx != GEANY_ENCODING_NONE)
                {
                        filedata->enc = g_strdup(encodings[enc_idx].charset);
                        filedata->bom = TRUE;

                        if (enc_idx != GEANY_ENCODING_UTF_8) /* the BOM indicated something else than UTF-8 */
                        {
                                gchar *converted_text = encodings_convert_to_utf8_from_charset(
                                                                                filedata->data, filedata->size, filedata->enc, FALSE);
                                if (converted_text != NULL)
                                {
                                        g_free(filedata->data);
                                        filedata->data = converted_text;
                                        filedata->len = strlen(converted_text);
                                }
                                else
                                {
                                        /* there was a problem converting data from BOM encoding type */
                                        g_free(filedata->enc);
                                        filedata->enc = NULL;
                                        filedata->bom = FALSE;
                                }
                        }
                }

                if (filedata->enc == NULL)      /* either there was no BOM or the BOM encoding failed */
                {
                        /* try UTF-8 first */
                        if ((filedata->size == filedata->len) &&
                                g_utf8_validate(filedata->data, filedata->len, NULL))
                        {
                                filedata->enc = g_strdup("UTF-8");
                        }
                        else
                        {
                                /* detect the encoding */
                                gchar *converted_text = encodings_convert_to_utf8(filedata->data,
                                        filedata->size, &filedata->enc);

                                if (converted_text == NULL)
                                {
                                        return FALSE;
                                }
                                g_free(filedata->data);
                                filedata->data = converted_text;
                                filedata->len = strlen(converted_text);
                        }
                }
        }
        return TRUE;
}


static void
handle_bom(FileData *filedata)
{
        guint bom_len;

        encodings_scan_unicode_bom(filedata->data, filedata->size, &bom_len);
        g_return_if_fail(bom_len != 0);

        /* use filedata->len here because the contents are already converted into UTF-8 */
        filedata->len -= bom_len;
        /* overwrite the BOM with the remainder of the file contents, plus the NULL terminator. */
        g_memmove(filedata->data, filedata->data + bom_len, filedata->len + 1);
        filedata->data = g_realloc(filedata->data, filedata->len + 1);
}


/* loads textfile data, verifies and converts to forced_enc or UTF-8. Also handles BOM. */
static gboolean load_text_file(const gchar *locale_filename, const gchar *display_filename,
        FileData *filedata, const gchar *forced_enc)
{
        GError *err = NULL;
        struct stat st;
        GeanyEncodingIndex tmp_enc_idx;

        filedata->data = NULL;
        filedata->len = 0;
        filedata->enc = NULL;
        filedata->bom = FALSE;
        filedata->readonly = FALSE;

        if (g_stat(locale_filename, &st) != 0)
        {
                ui_set_statusbar(TRUE, _("Could not open file %s (%s)"),
                        display_filename, g_strerror(errno));
                return FALSE;
        }

        filedata->mtime = st.st_mtime;

        if (! g_file_get_contents(locale_filename, &filedata->data, NULL, &err))
        {
                ui_set_statusbar(TRUE, "%s", err->message);
                g_error_free(err);
                return FALSE;
        }

        /* use strlen to check for null chars */
        filedata->size = (gsize) st.st_size;
        filedata->len = strlen(filedata->data);

        /* temporarily retrieve the encoding idx based on the BOM to suppress the following warning
         * if we have a BOM */
        tmp_enc_idx = encodings_scan_unicode_bom(filedata->data, filedata->size, NULL);

        /* check whether the size of the loaded data is equal to the size of the file in the
         * filesystem file size may be 0 to allow opening files in /proc/ which have typically a
         * file size of 0 bytes */
        if (filedata->len != filedata->size && filedata->size != 0 && (
                tmp_enc_idx == GEANY_ENCODING_UTF_8 || /* tmp_enc_idx can be UTF-7/8/16/32, UCS and None */
                tmp_enc_idx == GEANY_ENCODING_UTF_7))  /* filter UTF-7/8 where no NULL bytes are allowed */
        {
                const gchar *warn_msg = _(
                        "The file \"%s\" could not be opened properly and has been truncated. " \
                        "This can occur if the file contains a NULL byte. " \
                        "Be aware that saving it can cause data loss.\nThe file was set to read-only.");

                if (main_status.main_window_realized)
                        dialogs_show_msgbox(GTK_MESSAGE_WARNING, warn_msg, display_filename);

                ui_set_statusbar(TRUE, warn_msg, display_filename);

                /* set the file to read-only mode because saving it is probably dangerous */
                filedata->readonly = TRUE;
        }

        /* Determine character encoding and convert to UTF-8 */
        if (forced_enc != NULL)
        {
                /* the encoding should be ignored(requested by user), so open the file "as it is" */
                if (utils_str_equal(forced_enc, encodings[GEANY_ENCODING_NONE].charset))
                {
                        filedata->bom = FALSE;
                        filedata->enc = g_strdup(encodings[GEANY_ENCODING_NONE].charset);
                }
                else if (! handle_forced_encoding(filedata, forced_enc))
                {
                        /* For translators: the second wildcard is an encoding name, e.g.
                         * The file \"test.txt\" is not valid UTF-8. */
                        ui_set_statusbar(TRUE, _("The file \"%s\" is not valid %s."),
                                display_filename, forced_enc);
                        utils_beep();
                        g_free(filedata->data);
                        return FALSE;
                }
        }
        else if (! handle_encoding(filedata, tmp_enc_idx))
        {
                ui_set_statusbar(TRUE,
        _("The file \"%s\" does not look like a text file or the file encoding is not supported."),
                        display_filename);
                utils_beep();
                g_free(filedata->data);
                return FALSE;
        }

        if (filedata->bom)
                handle_bom(filedata);
        return TRUE;
}


/* Sets the cursor position on opening a file. First it sets the line when cl_options.goto_line
 * is set, otherwise it sets the line when pos is greater than zero and finally it sets the column
 * if cl_options.goto_column is set.
 *
 * returns the new position which may have changed */
static gint set_cursor_position(GeanyEditor *editor, gint pos)
{
        if (cl_options.goto_line >= 0)
        {       /* goto line which was specified on command line and then undefine the line */
                sci_goto_line(editor->sci, cl_options.goto_line - 1, TRUE);
                editor->scroll_percent = 0.5F;
                cl_options.goto_line = -1;
        }
        else if (pos > 0)
        {
                sci_set_current_position(editor->sci, pos, FALSE);
                editor->scroll_percent = 0.5F;
        }

        if (cl_options.goto_column >= 0)
        {       /* goto column which was specified on command line and then undefine the column */

                gint new_pos = sci_get_current_position(editor->sci) + cl_options.goto_column;
                sci_set_current_position(editor->sci, new_pos, FALSE);
                editor->scroll_percent = 0.5F;
                cl_options.goto_column = -1;
                return new_pos;
        }
        return sci_get_current_position(editor->sci);
}


/* Count lines that start with some hard tabs then a soft tab. */
static gboolean detect_tabs_and_spaces(GeanyEditor *editor)
{
        const GeanyIndentPrefs *iprefs = editor_get_indent_prefs(editor);
        ScintillaObject *sci = editor->sci;
        gsize count = 0;
        struct Sci_TextToFind ttf;
        gchar *soft_tab = g_strnfill(iprefs->width, ' ');
        gchar *regex = g_strconcat("^\t+", soft_tab, "[^ ]", NULL);

        g_free(soft_tab);

        ttf.chrg.cpMin = 0;
        ttf.chrg.cpMax = sci_get_length(sci);
        ttf.lpstrText = regex;
        while (1)
        {
                gint pos;

                pos = sci_find_text(sci, SCFIND_REGEXP, &ttf);
                if (pos == -1)
                        break;  /* no more matches */
                count++;
                ttf.chrg.cpMin = ttf.chrgText.cpMax + 1;        /* search after this match */
        }
        g_free(regex);
        /* The 0.02 is a low weighting to ignore a few possibly accidental occurrences */
        return count > sci_get_line_count(sci) * 0.02;
}


/* Detect the indent type based on counting the leading indent characters for each line. */
static GeanyIndentType detect_indent_type(GeanyEditor *editor)
{
        const GeanyIndentPrefs *iprefs = editor_get_indent_prefs(editor);
        ScintillaObject *sci = editor->sci;
        guint line, line_count;
        gsize tabs = 0, spaces = 0;

        if (detect_tabs_and_spaces(editor))
                return GEANY_INDENT_TYPE_BOTH;

        line_count = sci_get_line_count(sci);
        for (line = 0; line < line_count; line++)
        {
                gint pos = sci_get_position_from_line(sci, line);
                gchar c;

                /* most code will have indent total <= 24, otherwise it's more likely to be
                 * alignment than indentation */
                if (sci_get_line_indentation(sci, line) > 24)
                        continue;

                c = sci_get_char_at(sci, pos);
                if (c == '\t')
                        tabs++;
                else
                if (c == ' ')
                {
                        /* check for at least 2 spaces */
                        if (sci_get_char_at(sci, pos + 1) == ' ')
                                spaces++;
                }
        }
        if (spaces == 0 && tabs == 0)
                return iprefs->type;

        /* the factors may need to be tweaked */
        if (spaces > tabs * 4)
                return GEANY_INDENT_TYPE_SPACES;
        else if (tabs > spaces * 4)
                return GEANY_INDENT_TYPE_TABS;
        else
                return GEANY_INDENT_TYPE_BOTH;
}


void document_apply_indent_settings(GeanyDocument *doc)
{
        const GeanyIndentPrefs *iprefs = editor_get_indent_prefs(NULL);
        GeanyIndentType type = iprefs->type;

        switch (doc->file_type->id)
        {
                case GEANY_FILETYPES_MAKE:
                        /* force using tabs for indentation for Makefiles */
                        editor_set_indent(doc->editor, GEANY_INDENT_TYPE_TABS, iprefs->width);
                        return;
                case GEANY_FILETYPES_F77:
                        /* force using spaces for indentation for Fortran 77 */
                        editor_set_indent(doc->editor, GEANY_INDENT_TYPE_SPACES, iprefs->width);
                        return;
                default:
                        break;
        }
        if (iprefs->detect_type)
        {
                type = detect_indent_type(doc->editor);

                if (type != iprefs->type)
                {
                        const gchar *name = NULL;

                        switch (type)
                        {
                                case GEANY_INDENT_TYPE_SPACES:
                                        name = _("Spaces");
                                        break;
                                case GEANY_INDENT_TYPE_TABS:
                                        name = _("Tabs");
                                        break;
                                case GEANY_INDENT_TYPE_BOTH:
                                        name = _("Tabs and Spaces");
                                        break;
                        }
                        /* For translators: first wildcard is the indentation mode (Spaces, Tabs, Tabs
                         * and Spaces), the second one is the filename */
                        ui_set_statusbar(TRUE, _("Setting %s indentation mode for %s."), name,
                                DOC_FILENAME(doc));
                }
        }
        editor_set_indent(doc->editor, type, iprefs->width);
}


#if 0
static gboolean auto_update_tag_list(gpointer data)
{
        GeanyDocument *doc = data;

        if (! doc || ! doc->is_valid || doc->tm_file == NULL)
                return FALSE;

        if (gtk_window_get_focus(GTK_WINDOW(main_widgets.window)) != GTK_WIDGET(doc->editor->sci))
                return TRUE;

        if (update_tags_from_buffer(doc))
                sidebar_update_tag_list(doc, TRUE);

        return TRUE;
}
#endif


/* To open a new file, set doc to NULL; filename should be locale encoded.
 * To reload a file, set the doc for the document to be reloaded; filename should be NULL.
 * pos is the cursor position, which can be overridden by --line and --column.
 * forced_enc can be NULL to detect the file encoding.
 * Returns: doc of the opened file or NULL if an error occurred. */
GeanyDocument *document_open_file_full(GeanyDocument *doc, const gchar *filename, gint pos,
                gboolean readonly, GeanyFiletype *ft, const gchar *forced_enc)
{
        gint editor_mode;
        gboolean reload = (doc == NULL) ? FALSE : TRUE;
        gchar *utf8_filename = NULL;
        gchar *display_filename = NULL;
        gchar *locale_filename = NULL;
        GeanyFiletype *use_ft;
        FileData filedata;

        if (reload)
        {
                utf8_filename = g_strdup(doc->file_name);
                locale_filename = utils_get_locale_from_utf8(utf8_filename);
        }
        else
        {
                /* filename must not be NULL when opening a file */
                if (filename == NULL)
                {
                        ui_set_statusbar(FALSE, _("Invalid filename"));
                        return NULL;
                }

#ifdef G_OS_WIN32
                /* if filename is a shortcut, try to resolve it */
                locale_filename = win32_get_shortcut_target(filename);
#else
                locale_filename = g_strdup(filename);
#endif
                /* remove relative junk */
                utils_tidy_path(locale_filename);

                /* try to get the UTF-8 equivalent for the filename, fallback to filename if error */
                utf8_filename = utils_get_utf8_from_locale(locale_filename);

                /* if file is already open, switch to it and go */
                doc = document_find_by_filename(utf8_filename);
                if (doc != NULL)
                {
                        ui_add_recent_file(utf8_filename);      /* either add or reorder recent item */
                        /* show the doc before reload dialog */
                        gtk_notebook_set_current_page(GTK_NOTEBOOK(main_widgets.notebook),
                                gtk_notebook_page_num(GTK_NOTEBOOK(main_widgets.notebook),
                                (GtkWidget*) doc->editor->sci));
                        document_check_disk_status(doc, TRUE);  /* force a file changed check */
                }
        }
        if (reload || doc == NULL)
        {       /* doc possibly changed */
                display_filename = utils_str_middle_truncate(utf8_filename, 100);

                if (! load_text_file(locale_filename, display_filename, &filedata, forced_enc))
                {
                        g_free(display_filename);
                        g_free(utf8_filename);
                        g_free(locale_filename);
                        return NULL;
                }

                if (! reload)
                {
                        doc = document_create(utf8_filename);
                        g_return_val_if_fail(doc != NULL, NULL); /* really should not happen */

                        /* file exists on disk, set real_path */
                        setptr(doc->real_path, tm_get_real_path(locale_filename));

                        doc->priv->is_remote = utils_is_remote_path(locale_filename);
                        monitor_file_setup(doc);
                }

                sci_set_undo_collection(doc->editor->sci, FALSE); /* avoid creation of an undo action */
                sci_empty_undo_buffer(doc->editor->sci);

                /* add the text to the ScintillaObject */
                sci_set_readonly(doc->editor->sci, FALSE);      /* to allow replacing text */
                sci_set_text(doc->editor->sci, filedata.data);  /* NULL terminated data */
                queue_colourise(doc);   /* Ensure the document gets colourised. */

                /* detect & set line endings */
                editor_mode = utils_get_line_endings(filedata.data, filedata.len);
                sci_set_eol_mode(doc->editor->sci, editor_mode);
                g_free(filedata.data);

                sci_set_undo_collection(doc->editor->sci, TRUE);

                doc->priv->mtime = filedata.mtime; /* get the modification time from file and keep it */
                g_free(doc->encoding);  /* if reloading, free old encoding */
                doc->encoding = filedata.enc;
                doc->has_bom = filedata.bom;
                store_saved_encoding(doc);      /* store the opened encoding for undo/redo */

                doc->readonly = readonly || filedata.readonly;
                sci_set_readonly(doc->editor->sci, doc->readonly);

                /* update line number margin width */
                doc->priv->line_count = sci_get_line_count(doc->editor->sci);
                sci_set_line_numbers(doc->editor->sci, editor_prefs.show_linenumber_margin, 0);

                if (! reload)
                {

                        /* "the" SCI signal (connect after initial setup(i.e. adding text)) */
                        g_signal_connect(doc->editor->sci, "sci-notify", G_CALLBACK(editor_sci_notify_cb),
                                doc->editor);

                        use_ft = (ft != NULL) ? ft : filetypes_detect_from_document(doc);
                }
                else
                {       /* reloading */
                        document_undo_clear(doc);

                        use_ft = ft;
                }
                /* update taglist, typedef keywords and build menu if necessary */
                document_set_filetype(doc, use_ft);

                /* set indentation settings after setting the filetype */
                if (reload)
                        editor_set_indent(doc->editor, doc->editor->indent_type, doc->editor->indent_width); /* resetup sci */
                else
                        document_apply_indent_settings(doc);

                document_set_text_changed(doc, FALSE);  /* also updates tab state */
                ui_document_show_hide(doc);     /* update the document menu */

                /* finally add current file to recent files menu, but not the files from the last session */
                if (! main_status.opening_session_files)
                        ui_add_recent_file(utf8_filename);

                if (! reload)
                        g_signal_emit_by_name(geany_object, "document-open", doc);

                if (reload)
                        ui_set_statusbar(TRUE, _("File %s reloaded."), display_filename);
                else
                        /* For translators: this is the status window message for opening a file. %d is the number
                         * of the newly opened file, %s indicates whether the file is opened read-only
                         * (it is replaced with the string ", read-only"). */
                        msgwin_status_add(_("File %s opened(%d%s)."),
                                display_filename, gtk_notebook_get_n_pages(GTK_NOTEBOOK(main_widgets.notebook)),
                                (readonly) ? _(", read-only") : "");
        }

        g_free(display_filename);
        g_free(utf8_filename);
        g_free(locale_filename);

        /* TODO This could be used to automatically update the symbol list,
         * based on a configurable interval */
        /*g_timeout_add(10000, auto_update_tag_list, doc);*/

        /* set the cursor position according to pos, cl_options.goto_line and cl_options.goto_column */
        pos = set_cursor_position(doc->editor, pos);
        /* now bring the file in front */
        editor_goto_pos(doc->editor, pos, FALSE);

        /* finally, let the editor widget grab the focus so you can start coding
         * right away */
        g_idle_add(on_idle_focus, doc);
        return doc;
}


/* Takes a new line separated list of filename URIs and opens each file.
 * length is the length of the string or -1 if it should be detected */
void document_open_file_list(const gchar *data, gssize length)
{
        gint i;
        gchar *filename;
        gchar **list;

        g_return_if_fail(data != NULL);

        if (length < 0)
                length = strlen(data);

        switch (utils_get_line_endings(data, length))
        {
                case SC_EOL_CR: list = g_strsplit(data, "\r", 0); break;
                case SC_EOL_CRLF: list = g_strsplit(data, "\r\n", 0); break;
                case SC_EOL_LF: list = g_strsplit(data, "\n", 0); break;
                default: list = g_strsplit(data, "\n", 0);
        }

        for (i = 0; ; i++)
        {
                if (list[i] == NULL)
                        break;
                filename = g_filename_from_uri(list[i], NULL, NULL);
                if (G_UNLIKELY(filename == NULL))
                        continue;
                document_open_file(filename, FALSE, NULL, NULL);
                g_free(filename);
        }

        g_strfreev(list);
}


/**
 *  Opens each file in the list @a filenames.
 *  Internally, document_open_file() is called for every list item.
 *
 *  @param filenames A list of filenames to load, in locale encoding.
 *  @param readonly Whether to open the document in read-only mode.
 *  @param ft The filetype for the document or @c NULL to auto-detect the filetype.
 *  @param forced_enc The file encoding to use or @c NULL to auto-detect the file encoding.
 **/
void document_open_files(const GSList *filenames, gboolean readonly, GeanyFiletype *ft,
                const gchar *forced_enc)
{
        const GSList *item;

        for (item = filenames; item != NULL; item = g_slist_next(item))
        {
                document_open_file(item->data, readonly, ft, forced_enc);
        }
}


/**
 *  Reloads the document with the specified file encoding
 *  @a forced_enc or @c NULL to auto-detect the file encoding.
 *
 *  @param doc The document to reload.
 *  @param forced_enc The file encoding to use or @c NULL to auto-detect the file encoding.
 *
 *  @return @c TRUE if the document was actually reloaded or @c FALSE otherwise.
 **/
gboolean document_reload_file(GeanyDocument *doc, const gchar *forced_enc)
{
        gint pos = 0;
        GeanyDocument *new_doc;

        g_return_val_if_fail(doc != NULL, FALSE);

        /* try to set the cursor to the position before reloading */
        pos = sci_get_current_position(doc->editor->sci);
        new_doc = document_open_file_full(doc, NULL, pos, doc->readonly, doc->file_type, forced_enc);

        return (new_doc != NULL);
}


static gboolean document_update_timestamp(GeanyDocument *doc, const gchar *locale_filename)
{
#if ! USE_GIO_FILEMON
        struct stat st;

        g_return_val_if_fail(doc != NULL, FALSE);

        /* stat the file to get the timestamp, otherwise on Windows the actual
         * timestamp can be ahead of time(NULL) */
        if (g_stat(locale_filename, &st) != 0)
        {
                ui_set_statusbar(TRUE, _("Could not open file %s (%s)"), doc->file_name,
                        g_strerror(errno));
                return FALSE;
        }

        doc->priv->mtime = st.st_mtime; /* get the modification time from file and keep it */
#endif
        return TRUE;
}


/* Sets line and column to the given position byte_pos in the document.
 * byte_pos is the position counted in bytes, not characters */
static void get_line_column_from_pos(GeanyDocument *doc, guint byte_pos, gint *line, gint *column)
{
        gint i;
        gint line_start;

        /* for some reason we can use byte count instead of character count here */
        *line = sci_get_line_from_position(doc->editor->sci, byte_pos);
        line_start = sci_get_position_from_line(doc->editor->sci, *line);
        /* get the column in the line */
        *column = byte_pos - line_start;

        /* any non-ASCII characters are encoded with two bytes(UTF-8, always in Scintilla), so
         * skip one byte(i++) and decrease the column number which is based on byte count */
        for (i = line_start; i < (line_start + *column); i++)
        {
                if (sci_get_char_at(doc->editor->sci, i) < 0)
                {
                        (*column)--;
                        i++;
                }
        }
}


static void replace_header_filename(GeanyDocument *doc)
{
        gchar *filebase;
        gchar *filename;
        struct Sci_TextToFind ttf;

        g_return_if_fail(doc != NULL);
        g_return_if_fail(doc->file_type != NULL);

        if (doc->file_type->extension)
                filebase = g_strconcat("\\<", GEANY_STRING_UNTITLED, "\\.\\w+", NULL);
        else
                filebase = g_strdup(GEANY_STRING_UNTITLED);

        filename = g_path_get_basename(doc->file_name);

        /* only search the first 3 lines */
        ttf.chrg.cpMin = 0;
        ttf.chrg.cpMax = sci_get_position_from_line(doc->editor->sci, 3);
        ttf.lpstrText = filebase;

        if (search_find_text(doc->editor->sci, SCFIND_MATCHCASE | SCFIND_REGEXP, &ttf) != -1)
        {
                sci_set_target_start(doc->editor->sci, ttf.chrgText.cpMin);
                sci_set_target_end(doc->editor->sci, ttf.chrgText.cpMax);
                sci_replace_target(doc->editor->sci, filename, FALSE);
        }
        g_free(filebase);
        g_free(filename);
}


/**
 *  Renames the file in @a doc to @a new_filename. Only the file on disk is actually renamed,
 *  you still have to call @ref document_save_file_as() to change the @a doc object.
 *  It also stops monitoring for file changes to prevent receiving too many file change events
 *  while renaming. File monitoring is setup again in @ref document_save_file_as().
 *
 *  @param doc The current document which should be renamed.
 *  @param new_filename The new filename in UTF-8 encoding.
 *
 *  @since 0.16
 **/
void document_rename_file(GeanyDocument *doc, const gchar *new_filename)
{
        gchar *old_locale_filename = utils_get_locale_from_utf8(doc->file_name);
        gchar *new_locale_filename = utils_get_locale_from_utf8(new_filename);
        gint result;

        /* stop file monitoring to avoid getting events for deleting/creating files,
         * it's re-setup in document_save_file_as() */
        document_stop_file_monitoring(doc);

        result = g_rename(old_locale_filename, new_locale_filename);
        if (result != 0)
        {
                dialogs_show_msgbox_with_secondary(GTK_MESSAGE_ERROR,
                        _("Error renaming file."), g_strerror(errno));
        }
        g_free(old_locale_filename);
        g_free(new_locale_filename);
}


/* Return TRUE if the document doesn't have a full filename set.
 * This makes filenames without a path show the save as dialog, e.g. for file templates.
 * Otherwise just use the set filename instead of asking the user - e.g. for command-line
 * new files. */
gboolean document_need_save_as(GeanyDocument *doc)
{
        g_return_val_if_fail(doc != NULL, FALSE);

        return (doc->file_name == NULL || !g_path_is_absolute(doc->file_name));
}


/**
 * Saves the document, detecting the filetype.
 *
 * @param doc The document for the file to save.
 * @param utf8_fname The new name for the document, in UTF-8, or NULL.
 * @return @c TRUE if the file was saved or @c FALSE if the file could not be saved.
 *
 * @see document_save_file().
 *
 *  @since 0.16
 **/
gboolean document_save_file_as(GeanyDocument *doc, const gchar *utf8_fname)
{
        gboolean ret;

        g_return_val_if_fail(doc != NULL, FALSE);

        if (utf8_fname != NULL)
                setptr(doc->file_name, g_strdup(utf8_fname));

        /* reset real path, it's retrieved again in document_save() */
        setptr(doc->real_path, NULL);

        /* detect filetype */
        if (doc->file_type->id == GEANY_FILETYPES_NONE)
        {
                GeanyFiletype *ft = filetypes_detect_from_document(doc);

                document_set_filetype(doc, ft);
                if (document_get_current() == doc)
                {
                        ignore_callback = TRUE;
                        filetypes_select_radio_item(doc->file_type);
                        ignore_callback = FALSE;
                }
        }
        replace_header_filename(doc);

        ret = document_save_file(doc, TRUE);

        /* file monitoring support, add file monitoring after the file has been saved
         * to ignore any earlier events */
        monitor_file_setup(doc);
        doc->priv->file_disk_status = FILE_IGNORE;

        if (ret)
                ui_add_recent_file(doc->file_name);
        return ret;
}


static gsize save_convert_to_encoding(GeanyDocument *doc, gchar **data, gsize *len)
{
        GError *conv_error = NULL;
        gchar* conv_file_contents = NULL;
        gsize bytes_read;
        gsize conv_len;

        g_return_val_if_fail(data != NULL || *data == NULL, FALSE);
        g_return_val_if_fail(len != NULL, FALSE);

        /* try to convert it from UTF-8 to original encoding */
        conv_file_contents = g_convert(*data, *len - 1, doc->encoding, "UTF-8",
                                                                                                &bytes_read, &conv_len, &conv_error);

        if (conv_error != NULL)
        {
                gchar *text = g_strdup_printf(
_("An error occurred while converting the file from UTF-8 in \"%s\". The file remains unsaved."),
                        doc->encoding);
                gchar *error_text;

                if (conv_error->code == G_CONVERT_ERROR_ILLEGAL_SEQUENCE)
                {
                        gchar *context = NULL;
                        gint line, column;
                        gint context_len;
                        gunichar unic;
                        /* don't read over the doc length */
                        gint max_len = MIN((gint)bytes_read + 6, (gint)*len - 1);
                        context = g_malloc(7); /* read 6 bytes from Sci + '\0' */
                        sci_get_text_range(doc->editor->sci, bytes_read, max_len, context);

                        /* take only one valid Unicode character from the context and discard the leftover */
                        unic = g_utf8_get_char_validated(context, -1);
                        context_len = g_unichar_to_utf8(unic, context);
                        context[context_len] = '\0';
                        get_line_column_from_pos(doc, bytes_read, &line, &column);

                        error_text = g_strdup_printf(
                                _("Error message: %s\nThe error occurred at \"%s\" (line: %d, column: %d)."),
                                conv_error->message, context, line + 1, column);
                        g_free(context);
                }
                else
                        error_text = g_strdup_printf(_("Error message: %s."), conv_error->message);

                geany_debug("encoding error: %s", conv_error->message);
                dialogs_show_msgbox_with_secondary(GTK_MESSAGE_ERROR, text, error_text);
                g_error_free(conv_error);
                g_free(text);
                g_free(error_text);
                return FALSE;
        }
        else
        {
                g_free(*data);
                *data = conv_file_contents;
                *len = conv_len;
        }
        return TRUE;
}


static gchar *write_data_to_disk(const gchar *locale_filename,
                                                                 const gchar *data, gint len)
{
        GError *error = NULL;

        if (! file_prefs.use_safe_file_saving)
        {
#ifdef HAVE_GIO
                GFile *fp;

                /* Use GIO API to save file (GVFS-safe) */
                fp = g_file_new_for_path(locale_filename);
                g_file_replace_contents(fp, data, len, NULL, FALSE,
                        G_FILE_CREATE_NONE, NULL, NULL, &error);
                g_object_unref(fp);
#else
                FILE *fp;
                gint bytes_written;
                gboolean fail = FALSE;

                /* Use POSIX API for unsafe saving (GVFS-unsafe) */
                errno = 0;
                fp = g_fopen(locale_filename, "wb");
                if (fp == NULL)
                        fail = TRUE;
                else
                {
                        errno = 0;
                        bytes_written = fwrite(data, sizeof(gchar), len, fp);

                        if (len != bytes_written)
                                fail = TRUE;

                        if (fclose(fp) != 0)
                                fail = TRUE;
                }
                if (fail)
                {
                        gint err = errno;
                        if (!err)
                                err = EIO;
                        return g_strdup(g_strerror(err));
                }
#endif
        }
        else
        {
                /* Use old GLib API for safe saving (GVFS-safe, but alters ownership and permissons).
                 * This is the only option that handles disk space exhaustion. */
                if (g_file_set_contents(locale_filename, data, len, &error))
                        geany_debug("Wrote %s with g_file_set_contents().", locale_filename);
        }
        if (error != NULL)
        {
                gchar *msg = g_strdup(error->message);
                g_error_free(error);
                return msg;
        }
        return NULL;
}


static gchar *save_doc(GeanyDocument *doc, const gchar *locale_filename,
                                                                 const gchar *data, gint len)
{
        gchar *err;

        g_return_val_if_fail(doc != NULL, g_strdup(g_strerror(EINVAL)));
        g_return_val_if_fail(data != NULL, g_strdup(g_strerror(EINVAL)));

        err = write_data_to_disk(locale_filename, data, len);
        if (err)
                return err;

        /* now the file is on disk, set real_path */
        if (doc->real_path == NULL)
        {
                doc->real_path = tm_get_real_path(locale_filename);
                doc->priv->is_remote = utils_is_remote_path(locale_filename);
                monitor_file_setup(doc);
        }
        return NULL;
}


/**
 *  Saves the document. Saving includes replacing tabs by spaces,
 *  stripping trailing spaces and adding a final new line at the end of the file (all only if
 *  user enabled these features). Then the @c "document-before-save" signal is emitted,
 *  allowing plugins to modify the document before it is saved, and data is
 *  actually written to disk. The filetype is set again or auto-detected if it wasn't set yet.
 *  Afterwards, the @c "document-save" signal is emitted for plugins.
 *
 *  If the file is not modified, this functions does nothing unless force is set to @c TRUE.
 *
 *  @param doc The document to save.
 *  @param force Whether to save the file even if it is not modified (e.g. for Save As).
 *
 *  @return @c TRUE if the file was saved or @c FALSE if the file could not or should not be saved.
 **/
gboolean document_save_file(GeanyDocument *doc, gboolean force)
{
        gchar *errmsg;
        gchar *data;
        gsize len;
        gchar *locale_filename;

        g_return_val_if_fail(doc != NULL, FALSE);

        /* the "changed" flag should exclude the "readonly" flag, but check it anyway for safety */
        if (! force && ! ui_prefs.allow_always_save && (! doc->changed || doc->readonly))
                return FALSE;

        if (G_UNLIKELY(doc->file_name == NULL))
        {
                ui_set_statusbar(TRUE, _("Error saving file."));
                utils_beep();
                return FALSE;
        }

        /* replaces tabs by spaces but only if the current file is not a Makefile */
        if (file_prefs.replace_tabs && doc->file_type->id != GEANY_FILETYPES_MAKE)
                editor_replace_tabs(doc->editor);
        /* strip trailing spaces */
        if (file_prefs.strip_trailing_spaces)
                editor_strip_trailing_spaces(doc->editor);
        /* ensure the file has a newline at the end */
        if (file_prefs.final_new_line)
                editor_ensure_final_newline(doc->editor);
        /* ensure newlines are consistent */
        if (file_prefs.ensure_convert_new_lines)
                sci_convert_eols(doc->editor->sci, sci_get_eol_mode(doc->editor->sci));

        /* notify plugins which may wish to modify the document before it's saved */
        g_signal_emit_by_name(geany_object, "document-before-save", doc);

        len = sci_get_length(doc->editor->sci) + 1;
        if (doc->has_bom && encodings_is_unicode_charset(doc->encoding))
        {       /* always write a UTF-8 BOM because in this moment the text itself is still in UTF-8
                 * encoding, it will be converted to doc->encoding below and this conversion
                 * also changes the BOM */
                data = (gchar*) g_malloc(len + 3);      /* 3 chars for BOM */
                data[0] = (gchar) 0xef;
                data[1] = (gchar) 0xbb;
                data[2] = (gchar) 0xbf;
                sci_get_text(doc->editor->sci, len, data + 3);
                len += 3;
        }
        else
        {
                data = (gchar*) g_malloc(len);
                sci_get_text(doc->editor->sci, len, data);
        }

        /* save in original encoding, skip when it is already UTF-8 or has the encoding "None" */
        if (doc->encoding != NULL && ! utils_str_equal(doc->encoding, "UTF-8") &&
                ! utils_str_equal(doc->encoding, encodings[GEANY_ENCODING_NONE].charset))
        {
                if (! save_convert_to_encoding(doc, &data, &len))
                {
                        g_free(data);
                        return FALSE;
                }
        }
        else
        {
                len = strlen(data);
        }

        locale_filename = utils_get_locale_from_utf8(doc->file_name);

        /* ignore file changed notification when the file is written */
        doc->priv->file_disk_status = FILE_IGNORE;

        /* actually write the content of data to the file on disk */
        errmsg = save_doc(doc, locale_filename, data, len);
        g_free(data);

        if (errmsg != NULL)
        {
                ui_set_statusbar(TRUE, _("Error saving file (%s)."), errmsg);
                dialogs_show_msgbox_with_secondary(GTK_MESSAGE_ERROR, _("Error saving file."), errmsg);
                doc->priv->file_disk_status = FILE_OK;
                utils_beep();
                g_free(locale_filename);
                g_free(errmsg);
                return FALSE;
        }

        /* store the opened encoding for undo/redo */
        store_saved_encoding(doc);

        /* ignore the following things if we are quitting */
        if (! main_status.quitting)
        {
                sci_set_savepoint(doc->editor->sci);

                if (file_prefs.disk_check_timeout > 0)
                        document_update_timestamp(doc, locale_filename);

                /* update filetype-related things */
                document_set_filetype(doc, doc->file_type);

                document_update_tab_label(doc);

                msgwin_status_add(_("File %s saved."), doc->file_name);
                ui_update_statusbar(doc, -1);
#ifdef HAVE_VTE
                vte_cwd((doc->real_path != NULL) ? doc->real_path : doc->file_name, FALSE);
#endif
        }
        g_free(locale_filename);

        g_signal_emit_by_name(geany_object, "document-save", doc);

        return TRUE;
}


/* special search function, used from the find entry in the toolbar
 * return TRUE if text was found otherwise FALSE
 * return also TRUE if text is empty  */
gboolean document_search_bar_find(GeanyDocument *doc, const gchar *text, gint flags, gboolean inc)
{
        gint start_pos, search_pos;
        struct Sci_TextToFind ttf;

        g_return_val_if_fail(text != NULL, FALSE);
        g_return_val_if_fail(doc != NULL, FALSE);
        if (! *text)
                return TRUE;

        start_pos = (inc) ? sci_get_selection_start(doc->editor->sci) :
                sci_get_selection_end(doc->editor->sci);        /* equal if no selection */

        /* search cursor to end */
        ttf.chrg.cpMin = start_pos;
        ttf.chrg.cpMax = sci_get_length(doc->editor->sci);
        ttf.lpstrText = (gchar *)text;
        search_pos = sci_find_text(doc->editor->sci, flags, &ttf);

        /* if no match, search start to cursor */
        if (search_pos == -1)
        {
                ttf.chrg.cpMin = 0;
                ttf.chrg.cpMax = start_pos + strlen(text);
                search_pos = sci_find_text(doc->editor->sci, flags, &ttf);
        }

        if (search_pos != -1)
        {
                gint line = sci_get_line_from_position(doc->editor->sci, ttf.chrgText.cpMin);

                /* unfold maybe folded results */
                sci_ensure_line_is_visible(doc->editor->sci, line);

                sci_set_selection_start(doc->editor->sci, ttf.chrgText.cpMin);
                sci_set_selection_end(doc->editor->sci, ttf.chrgText.cpMax);

                if (! editor_line_in_view(doc->editor, line))
                {       /* we need to force scrolling in case the cursor is outside of the current visible area
                         * GeanyDocument::scroll_percent doesn't work because sci isn't always updated
                         * while searching */
                        editor_scroll_to_line(doc->editor, -1, 0.3F);
                }
                else
                        sci_scroll_caret(doc->editor->sci); /* may need horizontal scrolling */
                return TRUE;
        }
        else
        {
                if (! inc)
                {
                        ui_set_statusbar(FALSE, _("\"%s\" was not found."), text);
                }
                utils_beep();
                sci_goto_pos(doc->editor->sci, start_pos, FALSE);       /* clear selection */
                return FALSE;
        }
}


/* General search function, used from the find dialog.
 * Returns -1 on failure or the start position of the matching text.
 * Will skip past any selection, ignoring it. */
gint document_find_text(GeanyDocument *doc, const gchar *text, gint flags, gboolean search_backwards,
                gboolean scroll, GtkWidget *parent)
{
        gint selection_end, selection_start, search_pos;

        g_return_val_if_fail(doc != NULL && text != NULL, -1);
        if (! *text)
                return -1;

        /* Sci doesn't support searching backwards with a regex */
        if (flags & SCFIND_REGEXP)
                search_backwards = FALSE;

        selection_start = sci_get_selection_start(doc->editor->sci);
        selection_end = sci_get_selection_end(doc->editor->sci);
        if ((selection_end - selection_start) > 0)
        { /* there's a selection so go to the end */
                if (search_backwards)
                        sci_goto_pos(doc->editor->sci, selection_start, TRUE);
                else
                        sci_goto_pos(doc->editor->sci, selection_end, TRUE);
        }

        sci_set_search_anchor(doc->editor->sci);
        if (search_backwards)
                search_pos = sci_search_prev(doc->editor->sci, flags, text);
        else
                search_pos = search_find_next(doc->editor->sci, text, flags);

        if (search_pos != -1)
        {
                /* unfold maybe folded results */
                sci_ensure_line_is_visible(doc->editor->sci,
                        sci_get_line_from_position(doc->editor->sci, search_pos));
                if (scroll)
                        doc->editor->scroll_percent = 0.3F;
        }
        else
        {
                gint sci_len = sci_get_length(doc->editor->sci);

                /* if we just searched the whole text, give up searching. */
                if ((selection_end == 0 && ! search_backwards) ||
                        (selection_end == sci_len && search_backwards))
                {
                        ui_set_statusbar(FALSE, _("\"%s\" was not found."), text);
                        utils_beep();
                        return -1;
                }

                /* we searched only part of the document, so ask whether to wraparound. */
                if (search_prefs.suppress_dialogs ||
                        dialogs_show_question_full(parent, GTK_STOCK_FIND, GTK_STOCK_CANCEL,
                                _("Wrap search and find again?"), _("\"%s\" was not found."), text))
                {
                        gint ret;

                        sci_set_current_position(doc->editor->sci, (search_backwards) ? sci_len : 0, FALSE);
                        ret = document_find_text(doc, text, flags, search_backwards, scroll, parent);
                        if (ret == -1)
                        {       /* return to original cursor position if not found */
                                sci_set_current_position(doc->editor->sci, selection_start, FALSE);
                        }
                        return ret;
                }
        }
        return search_pos;
}


/* Replaces the selection if it matches, otherwise just finds the next match.
 * Returns: start of replaced text, or -1 if no replacement was made */
gint document_replace_text(GeanyDocument *doc, const gchar *find_text, const gchar *replace_text,
                gint flags, gboolean search_backwards)
{
        gint selection_end, selection_start, search_pos;

        g_return_val_if_fail(doc != NULL && find_text != NULL && replace_text != NULL, -1);

        if (! *find_text)
                return -1;

        /* Sci doesn't support searching backwards with a regex */
        if (flags & SCFIND_REGEXP)
                search_backwards = FALSE;

        selection_start = sci_get_selection_start(doc->editor->sci);
        selection_end = sci_get_selection_end(doc->editor->sci);
        if (selection_end == selection_start)
        {
                /* no selection so just find the next match */
                document_find_text(doc, find_text, flags, search_backwards, TRUE, NULL);
                return -1;
        }
        /* there's a selection so go to the start before finding to search through it
         * this ensures there is a match */
        if (search_backwards)
                sci_goto_pos(doc->editor->sci, selection_end, TRUE);
        else
                sci_goto_pos(doc->editor->sci, selection_start, TRUE);

        search_pos = document_find_text(doc, find_text, flags, search_backwards, TRUE, NULL);
        /* return if the original selected text did not match (at the start of the selection) */
        if (search_pos != selection_start)
                return -1;

        if (search_pos != -1)
        {
                gint replace_len;
                /* search next/prev will select matching text, which we use to set the replace target */
                sci_target_from_selection(doc->editor->sci);
                replace_len = search_replace_target(doc->editor->sci, replace_text, flags & SCFIND_REGEXP);
                /* select the replacement - find text will skip past the selected text */
                sci_set_selection_start(doc->editor->sci, search_pos);
                sci_set_selection_end(doc->editor->sci, search_pos + replace_len);
        }
        else
        {
                /* no match in the selection */
                utils_beep();
        }
        return search_pos;
}


static void show_replace_summary(GeanyDocument *doc, gint count, const gchar *find_text,
                const gchar *replace_text, gboolean escaped_chars)
{
        gchar *escaped_find_text, *escaped_replace_text, *filename;

        if (count == 0)
        {
                ui_set_statusbar(FALSE, _("No matches found for \"%s\"."), find_text);
                return;
        }

        filename = g_path_get_basename(DOC_FILENAME(doc));

        if (escaped_chars)
        {       /* escape special characters for showing */
                escaped_find_text = g_strescape(find_text, NULL);
                escaped_replace_text = g_strescape(replace_text, NULL);
                ui_set_statusbar(TRUE, ngettext(
                        "%s: replaced %d occurrence of \"%s\" with \"%s\".",
                        "%s: replaced %d occurrences of \"%s\" with \"%s\".",
                        count), filename, count, escaped_find_text, escaped_replace_text);
                g_free(escaped_find_text);
                g_free(escaped_replace_text);
        }
        else
        {
                ui_set_statusbar(TRUE, ngettext(
                        "%s: replaced %d occurrence of \"%s\" with \"%s\".",
                        "%s: replaced %d occurrences of \"%s\" with \"%s\".",
                        count), filename, count, find_text, replace_text);
        }
        g_free(filename);
}


/* Replace all text matches in a certain range within document.
 * If not NULL, *new_range_end is set to the new range endpoint after replacing,
 * or -1 if no text was found.
 * scroll_to_match is whether to scroll the last replacement in view (which also
 * clears the selection).
 * Returns: the number of replacements made. */
static guint
document_replace_range(GeanyDocument *doc, const gchar *find_text, const gchar *replace_text,
        gint flags, gint start, gint end, gboolean scroll_to_match, gint *new_range_end)
{
        gint count = 0;
        struct Sci_TextToFind ttf;
        ScintillaObject *sci;

        if (new_range_end != NULL)
                *new_range_end = -1;

        g_return_val_if_fail(doc != NULL && find_text != NULL && replace_text != NULL, 0);

        if (! *find_text || doc->readonly)
                return 0;

        sci = doc->editor->sci;

        ttf.chrg.cpMin = start;
        ttf.chrg.cpMax = end;
        ttf.lpstrText = (gchar*)find_text;

        sci_start_undo_action(sci);
        count = search_replace_range(sci, &ttf, flags, replace_text);
        sci_end_undo_action(sci);

        if (count > 0)
        {       /* scroll last match in view, will destroy the existing selection */
                if (scroll_to_match)
                        sci_goto_pos(sci, ttf.chrg.cpMin, TRUE);

                if (new_range_end != NULL)
                        *new_range_end = ttf.chrg.cpMax;
        }
        return count;
}


void document_replace_sel(GeanyDocument *doc, const gchar *find_text, const gchar *replace_text,
                                                  gint flags, gboolean escaped_chars)
{
        gint selection_end, selection_start, selection_mode, selected_lines, last_line = 0;
        gint max_column = 0, count = 0;
        gboolean replaced = FALSE;

        g_return_if_fail(doc != NULL && find_text != NULL && replace_text != NULL);

        if (! *find_text)
                return;

        selection_start = sci_get_selection_start(doc->editor->sci);
        selection_end = sci_get_selection_end(doc->editor->sci);
        /* do we have a selection? */
        if ((selection_end - selection_start) == 0)
        {
                utils_beep();
                return;
        }

        selection_mode = sci_get_selection_mode(doc->editor->sci);
        selected_lines = sci_get_lines_selected(doc->editor->sci);
        /* handle rectangle, multi line selections (it doesn't matter on a single line) */
        if (selection_mode == SC_SEL_RECTANGLE && selected_lines > 1)
        {
                gint first_line, line;

                sci_start_undo_action(doc->editor->sci);

                first_line = sci_get_line_from_position(doc->editor->sci, selection_start);
                /* Find the last line with chars selected (not EOL char) */
                last_line = sci_get_line_from_position(doc->editor->sci,
                        selection_end - editor_get_eol_char_len(doc->editor));
                last_line = MAX(first_line, last_line);
                for (line = first_line; line < (first_line + selected_lines); line++)
                {
                        gint line_start = sci_get_pos_at_line_sel_start(doc->editor->sci, line);
                        gint line_end = sci_get_pos_at_line_sel_end(doc->editor->sci, line);

                        /* skip line if there is no selection */
                        if (line_start != INVALID_POSITION)
                        {
                                /* don't let document_replace_range() scroll to match to keep our selection */
                                gint new_sel_end;

                                count += document_replace_range(doc, find_text, replace_text, flags,
                                                                line_start, line_end, FALSE, &new_sel_end);
                                if (new_sel_end != -1)
                                {
                                        replaced = TRUE;
                                        /* this gets the greatest column within the selection after replacing */
                                        max_column = MAX(max_column,
                                                new_sel_end - sci_get_position_from_line(doc->editor->sci, line));
                                }
                        }
                }
                sci_end_undo_action(doc->editor->sci);
        }
        else    /* handle normal line selection */
        {
                count += document_replace_range(doc, find_text, replace_text, flags,
                                                selection_start, selection_end, TRUE, &selection_end);
                if (selection_end != -1)
                        replaced = TRUE;
        }

        if (replaced)
        {       /* update the selection for the new endpoint */

                if (selection_mode == SC_SEL_RECTANGLE && selected_lines > 1)
                {
                        /* now we can scroll to the selection and destroy it because we rebuild it later */
                        /*sci_goto_pos(doc->editor->sci, selection_start, FALSE);*/

                        /* Note: the selection will be wrapped to last_line + 1 if max_column is greater than
                         * the highest column on the last line. The wrapped selection is completely different
                         * from the original one, so skip the selection at all */
                        /* TODO is there a better way to handle the wrapped selection? */
                        if ((sci_get_line_length(doc->editor->sci, last_line) - 1) >= max_column)
                        {       /* for keeping and adjusting the selection in multi line rectangle selection we
                                 * need the last line of the original selection and the greatest column number after
                                 * replacing and set the selection end to the last line at the greatest column */
                                sci_set_selection_start(doc->editor->sci, selection_start);
                                sci_set_selection_end(doc->editor->sci,
                                        sci_get_position_from_line(doc->editor->sci, last_line) + max_column);
                                sci_set_selection_mode(doc->editor->sci, selection_mode);
                        }
                }
                else
                {
                        sci_set_selection_start(doc->editor->sci, selection_start);
                        sci_set_selection_end(doc->editor->sci, selection_end);
                }
        }
        else /* no replacements */
                utils_beep();

        show_replace_summary(doc, count, find_text, replace_text, escaped_chars);
}


/* returns number of replacements made. */
gint document_replace_all(GeanyDocument *doc, const gchar *find_text, const gchar *replace_text,
                gint flags, gboolean escaped_chars)
{
        gint len, count;
        g_return_val_if_fail(doc != NULL && find_text != NULL && replace_text != NULL, FALSE);

        if (! *find_text)
                return FALSE;

        len = sci_get_length(doc->editor->sci);
        count = document_replace_range(
                        doc, find_text, replace_text, flags, 0, len, TRUE, NULL);

        show_replace_summary(doc, count, find_text, replace_text, escaped_chars);
        return count;
}


static gboolean update_tags_from_buffer(GeanyDocument *doc)
{
        gboolean result;
#if 1
                /* old code */
                result = tm_source_file_update(doc->tm_file, TRUE, FALSE, TRUE);
#else
                gsize len = sci_get_length(doc->editor->sci) + 1;
                gchar *text = g_malloc(len);

                /* we copy the whole text into memory instead using a direct char pointer from
                 * Scintilla because tm_source_file_buffer_update() does modify the string slightly */
                sci_get_text(doc->editor->sci, len, text);
                result = tm_source_file_buffer_update(doc->tm_file, (guchar*) text, len, TRUE);
                g_free(text);
#endif
        return result;
}


void document_update_tag_list(GeanyDocument *doc, gboolean update)
{
        /* We must call sidebar_update_tag_list() before returning,
         * to ensure that the symbol list is always updated properly (e.g.
         * when creating a new document with a partial filename set. */
        gboolean success = FALSE;

        /* if the filetype doesn't have a tag parser or it is a new file */
        if (doc == NULL || doc->file_type == NULL || app->tm_workspace == NULL ||
                ! filetype_has_tags(doc->file_type) || ! doc->file_name)
        {
                /* set the default (empty) tag list */
                sidebar_update_tag_list(doc, FALSE);
                return;
        }

        if (doc->tm_file == NULL)
        {
                gchar *locale_filename = utils_get_locale_from_utf8(doc->file_name);
                const gchar *name;

                /* lookup the name rather than using filetype name to support custom filetypes */
                name = tm_source_file_get_lang_name(doc->file_type->lang);
                doc->tm_file = tm_source_file_new(locale_filename, FALSE, name);
                g_free(locale_filename);

                if (doc->tm_file)
                {
                        if (!tm_workspace_add_object(doc->tm_file))
                        {
                                tm_work_object_free(doc->tm_file);
                                doc->tm_file = NULL;
                        }
                        else
                        {
                                if (update)
                                        update_tags_from_buffer(doc);
                                success = TRUE;
                        }
                }
        }
        else
        {
                success = update_tags_from_buffer(doc);
                if (G_UNLIKELY(! success))
                        geany_debug("tag list updating failed");
        }
        sidebar_update_tag_list(doc, success);
}


/* Caches the list of project typenames, as a space separated GString.
 * Returns: TRUE if typenames have changed.
 * (*types) is set to the list of typenames, or NULL if there are none. */
static gboolean get_project_typenames(const GString **types, gint lang)
{
        static GString *last_typenames = NULL;
        GString *s = NULL;

        if (app->tm_workspace)
        {
                GPtrArray *tags_array = app->tm_workspace->work_object.tags_array;

                if (tags_array)
                {
                        s = symbols_find_tags_as_string(tags_array, TM_GLOBAL_TYPE_MASK, lang);
                }
        }

        if (s && last_typenames && g_string_equal(s, last_typenames))
        {
                g_string_free(s, TRUE);
                *types = last_typenames;
                return FALSE;   /* project typenames haven't changed */
        }
        /* cache typename list for next time */
        if (last_typenames)
                g_string_free(last_typenames, TRUE);
        last_typenames = s;

        *types = s;
        if (s == NULL)
                return FALSE;
        return TRUE;
}


/* If sci is NULL, update project typenames for all documents that support typenames,
 * if typenames have changed.
 * If sci is not NULL, then if sci supports typenames, project typenames are updated
 * if necessary, and typename keywords are set for sci.
 * Returns: TRUE if any scintilla type keywords were updated. */
static gboolean update_type_keywords(GeanyDocument *doc, gint lang)
{
        gboolean ret = FALSE;
        guint n;
        const GString *s;
        ScintillaObject *sci;

        g_return_val_if_fail(doc != NULL, FALSE);
        sci = doc->editor->sci;

        switch (doc->file_type->id)
        {       /* continue working with the following languages, skip on all others */
                case GEANY_FILETYPES_C:
                case GEANY_FILETYPES_CPP:
                case GEANY_FILETYPES_CS:
                case GEANY_FILETYPES_D:
                case GEANY_FILETYPES_JAVA:
                case GEANY_FILETYPES_VALA:
                        break;
                default:
                        return FALSE;
        }

        sci = doc->editor->sci;
        if (sci != NULL && editor_lexer_get_type_keyword_idx(sci_get_lexer(sci)) == -1)
                return FALSE;

        if (! get_project_typenames(&s, lang))
        {       /* typenames have not changed */
                if (s != NULL && sci != NULL)
                {
                        gint keyword_idx = editor_lexer_get_type_keyword_idx(sci_get_lexer(sci));

                        sci_set_keywords(sci, keyword_idx, s->str);
                        queue_colourise(doc);
                }
                return FALSE;
        }
        g_return_val_if_fail(s != NULL, FALSE);

        for (n = 0; n < documents_array->len; n++)
        {
                if (documents[n]->is_valid)
                {
                        ScintillaObject *wid = documents[n]->editor->sci;
                        gint keyword_idx = editor_lexer_get_type_keyword_idx(sci_get_lexer(wid));

                        if (keyword_idx > 0)
                        {
                                sci_set_keywords(wid, keyword_idx, s->str);
                                queue_colourise(documents[n]);
                                ret = TRUE;
                        }
                }
        }
        return ret;
}


static void document_load_config(GeanyDocument *doc, GeanyFiletype *type,
                gboolean filetype_changed)
{
        g_return_if_fail(doc);
        if (type == NULL)
                type = filetypes[GEANY_FILETYPES_NONE];

        if (filetype_changed)
        {
                doc->file_type = type;

                /* delete tm file object to force creation of a new one */
                if (doc->tm_file != NULL)
                {
                        tm_workspace_remove_object(doc->tm_file, TRUE, TRUE);
                        doc->tm_file = NULL;
                }
                /* load tags files before highlighting (some lexers highlight global typenames) */
                if (type->id != GEANY_FILETYPES_NONE)
                        symbols_global_tags_loaded(type->id);

                highlighting_set_styles(doc->editor->sci, type);
                editor_set_indentation_guides(doc->editor);
                build_menu_update(doc);
                queue_colourise(doc);
                doc->priv->symbol_list_sort_mode = type->priv->symbol_list_sort_mode;
        }

        document_update_tag_list(doc, TRUE);

        /* Update session typename keywords. */
        update_type_keywords(doc, type->lang);
}


/** Sets the filetype of the document (which controls syntax highlighting and tags)
 * @param doc The document to use.
 * @param type The filetype. */
void document_set_filetype(GeanyDocument *doc, GeanyFiletype *type)
{
        gboolean ft_changed;
        GeanyFiletype *old_ft;

        g_return_if_fail(doc);
        if (type == NULL)
                type = filetypes[GEANY_FILETYPES_NONE];

        old_ft = doc->file_type;
        geany_debug("%s : %s (%s)",
                (doc->file_name != NULL) ? doc->file_name : "unknown",
                type->name,
                (doc->encoding != NULL) ? doc->encoding : "unknown");

        ft_changed = (doc->file_type != type); /* filetype has changed */
        document_load_config(doc, type, ft_changed);

        if (ft_changed)
        {
                sidebar_openfiles_update(doc); /* to update the icon */
                g_signal_emit_by_name(geany_object, "document-filetype-set", doc, old_ft);
        }
}


void document_reload_config(GeanyDocument *doc)
{
        document_load_config(doc, doc->file_type, TRUE);
}


/**
 *  Sets the encoding of a document.
 *  This function only set the encoding of the %document, it does not any conversions. The new
 *  encoding is used when e.g. saving the file.
 *
 *  @param doc The document to use.
 *  @param new_encoding The encoding to be set for the document.
 **/
void document_set_encoding(GeanyDocument *doc, const gchar *new_encoding)
{
        if (doc == NULL || new_encoding == NULL ||
                utils_str_equal(new_encoding, doc->encoding))
                return;

        g_free(doc->encoding);
        doc->encoding = g_strdup(new_encoding);

        ui_update_statusbar(doc, -1);
        gtk_widget_set_sensitive(ui_lookup_widget(main_widgets.window, "menu_write_unicode_bom1"),
                        encodings_is_unicode_charset(doc->encoding));
}


/* own Undo / Redo implementation to be able to undo / redo changes
 * to the encoding or the Unicode BOM (which are Scintilla independet).
 * All Scintilla events are stored in the undo / redo buffer and are passed through. */

/* Clears the Undo and Redo buffer (to be called when reloading or closing the document) */
void document_undo_clear(GeanyDocument *doc)
{
        undo_action *a;

        while (g_trash_stack_height(&doc->priv->undo_actions) > 0)
        {
                a = g_trash_stack_pop(&doc->priv->undo_actions);
                if (G_LIKELY(a != NULL))
                {
                        switch (a->type)
                        {
                                case UNDO_ENCODING: g_free(a->data); break;
                                default: break;
                        }
                        g_free(a);
                }
        }
        doc->priv->undo_actions = NULL;

        while (g_trash_stack_height(&doc->priv->redo_actions) > 0)
        {
                a = g_trash_stack_pop(&doc->priv->redo_actions);
                if (G_LIKELY(a != NULL))
                {
                        switch (a->type)
                        {
                                case UNDO_ENCODING: g_free(a->data); break;
                                default: break;
                        }
                        g_free(a);
                }
        }
        doc->priv->redo_actions = NULL;

        if (! main_status.quitting && doc->editor != NULL)
                document_set_text_changed(doc, FALSE);
}


void document_undo_add(GeanyDocument *doc, guint type, gpointer data)
{
        undo_action *action;

        g_return_if_fail(doc != NULL);

        action = g_new0(undo_action, 1);
        action->type = type;
        action->data = data;

        g_trash_stack_push(&doc->priv->undo_actions, action);

        document_set_text_changed(doc, TRUE);
        ui_update_popup_reundo_items(doc);
}


gboolean document_can_undo(GeanyDocument *doc)
{
        g_return_val_if_fail(doc != NULL, FALSE);

        if (g_trash_stack_height(&doc->priv->undo_actions) > 0 || sci_can_undo(doc->editor->sci))
                return TRUE;
        else
                return FALSE;
}


static void update_changed_state(GeanyDocument *doc)
{
        doc->changed =
                (sci_is_modified(doc->editor->sci) ||
                doc->has_bom != doc->priv->saved_encoding.has_bom ||
                ! utils_str_equal(doc->encoding, doc->priv->saved_encoding.encoding));
        document_set_text_changed(doc, doc->changed);
}


void document_undo(GeanyDocument *doc)
{
        undo_action *action;

        g_return_if_fail(doc != NULL);

        action = g_trash_stack_pop(&doc->priv->undo_actions);

        if (G_UNLIKELY(action == NULL))
        {
                /* fallback, should not be necessary */
                geany_debug("%s: fallback used", G_STRFUNC);
                sci_undo(doc->editor->sci);
        }
        else
        {
                switch (action->type)
                {
                        case UNDO_SCINTILLA:
                        {
                                document_redo_add(doc, UNDO_SCINTILLA, NULL);

                                sci_undo(doc->editor->sci);
                                break;
                        }
                        case UNDO_BOM:
                        {
                                document_redo_add(doc, UNDO_BOM, GINT_TO_POINTER(doc->has_bom));

                                doc->has_bom = GPOINTER_TO_INT(action->data);
                                ui_update_statusbar(doc, -1);
                                ui_document_show_hide(doc);
                                break;
                        }
                        case UNDO_ENCODING:
                        {
                                /* use the "old" encoding */
                                document_redo_add(doc, UNDO_ENCODING, g_strdup(doc->encoding));

                                document_set_encoding(doc, (const gchar*)action->data);

                                ignore_callback = TRUE;
                                encodings_select_radio_item((const gchar*)action->data);
                                ignore_callback = FALSE;

                                g_free(action->data);
                                break;
                        }
                        default: break;
                }
        }
        g_free(action); /* free the action which was taken from the stack */

        update_changed_state(doc);
        ui_update_popup_reundo_items(doc);
}


gboolean document_can_redo(GeanyDocument *doc)
{
        g_return_val_if_fail(doc != NULL, FALSE);

        if (g_trash_stack_height(&doc->priv->redo_actions) > 0 || sci_can_redo(doc->editor->sci))
                return TRUE;
        else
                return FALSE;
}


void document_redo(GeanyDocument *doc)
{
        undo_action *action;

        g_return_if_fail(doc != NULL);

        action = g_trash_stack_pop(&doc->priv->redo_actions);

        if (G_UNLIKELY(action == NULL))
        {
                /* fallback, should not be necessary */
                geany_debug("%s: fallback used", G_STRFUNC);
                sci_redo(doc->editor->sci);
        }
        else
        {
                switch (action->type)
                {
                        case UNDO_SCINTILLA:
                        {
                                document_undo_add(doc, UNDO_SCINTILLA, NULL);

                                sci_redo(doc->editor->sci);
                                break;
                        }
                        case UNDO_BOM:
                        {
                                document_undo_add(doc, UNDO_BOM, GINT_TO_POINTER(doc->has_bom));

                                doc->has_bom = GPOINTER_TO_INT(action->data);
                                ui_update_statusbar(doc, -1);
                                ui_document_show_hide(doc);
                                break;
                        }
                        case UNDO_ENCODING:
                        {
                                document_undo_add(doc, UNDO_ENCODING, g_strdup(doc->encoding));

                                document_set_encoding(doc, (const gchar*)action->data);

                                ignore_callback = TRUE;
                                encodings_select_radio_item((const gchar*)action->data);
                                ignore_callback = FALSE;

                                g_free(action->data);
                                break;
                        }
                        default: break;
                }
        }
        g_free(action); /* free the action which was taken from the stack */

        update_changed_state(doc);
        ui_update_popup_reundo_items(doc);
}


static void document_redo_add(GeanyDocument *doc, guint type, gpointer data)
{
        undo_action *action;

        g_return_if_fail(doc != NULL);

        action = g_new0(undo_action, 1);
        action->type = type;
        action->data = data;

        g_trash_stack_push(&doc->priv->redo_actions, action);

        document_set_text_changed(doc, TRUE);
        ui_update_popup_reundo_items(doc);
}


/**
 *  Gets the status color of the document, or @c NULL if default widget coloring should be used.
 *  Returned colors are red if the document has changes, green if the document is read-only
 *  or simply @c NULL if the document is unmodified but writable.
 *
 *  @param doc The document to use.
 *
 *  @return The color for the document or @c NULL if the default color should be used. The color
 *          object is owned by Geany and should not be modified or freed.
 *
 *  @since 0.16
 */
const GdkColor *document_get_status_color(GeanyDocument *doc)
{
        static GdkColor red = {0, 0xFFFF, 0, 0};
        static GdkColor green = {0, 0, 0x7FFF, 0};
#if USE_GIO_FILEMON
        static GdkColor orange = {0, 0xFFFF, 0x7FFF, 0};
#endif
        GdkColor *color = NULL;

        g_return_val_if_fail(doc != NULL, NULL);

        if (doc->changed)
                color = &red;
#if USE_GIO_FILEMON
        else if (doc->priv->file_disk_status == FILE_CHANGED)
                color = &orange;
#endif
        else if (doc->readonly)
                color = &green;

        return color;   /* return pointer to static GdkColor. */
}


/** Accessor function for @ref GeanyData::documents_array items.
 * @warning Always check the returned document is valid (@c doc->is_valid).
 * @param idx @c documents_array index.
 * @return The document, or @c NULL if @a idx is out of range.
 *
 *  @since 0.16
 */
GeanyDocument *document_index(gint idx)
{
        return (idx >= 0 && idx < (gint) documents_array->len) ? documents[idx] : NULL;
}


/* create a new file and copy file content and properties */
GeanyDocument *document_clone(GeanyDocument *old_doc, const gchar *utf8_filename)
{
        gint len;
        gchar *text;
        GeanyDocument *doc;

        g_return_val_if_fail(old_doc != NULL, NULL);

        len = sci_get_length(old_doc->editor->sci) + 1;
        text = (gchar*) g_malloc(len);
        sci_get_text(old_doc->editor->sci, len, text);
        /* use old file type (or maybe NULL for auto detect would be better?) */
        doc = document_new_file(utf8_filename, old_doc->file_type, text);
        g_free(text);

        /* copy file properties */
        doc->editor->line_wrapping = old_doc->editor->line_wrapping;
        doc->readonly = old_doc->readonly;
        doc->has_bom = old_doc->has_bom;
        document_set_encoding(doc, old_doc->encoding);
        sci_set_lines_wrapped(doc->editor->sci, doc->editor->line_wrapping);
        sci_set_readonly(doc->editor->sci, doc->readonly);

        ui_document_show_hide(doc);
        return doc;
}


/* @note If successful, this should always be followed up with a call to
 * document_close_all().
 * @return TRUE if all files were saved or had their changes discarded. */
gboolean document_account_for_unsaved(void)
{
        guint i, p, page_count, len = documents_array->len;
        GeanyDocument *doc;

        page_count = gtk_notebook_get_n_pages(GTK_NOTEBOOK(main_widgets.notebook));
        for (p = 0; p < page_count; p++)
        {
                doc = document_get_from_page(p);
                if (DOC_VALID(doc) && doc->changed)
                {
                        if (! dialogs_show_unsaved_file(doc))
                                return FALSE;
                }
        }
        /* all documents should now be accounted for, so ignore any changes */
        for (i = 0; i < len; i++)
        {
                doc = documents[i];
                if (doc->is_valid && doc->changed)
                {
                        doc->changed = FALSE;
                }
        }
        return TRUE;
}


static void force_close_all(void)
{
        guint i, len = documents_array->len;

        /* check all documents have been accounted for */
        for (i = 0; i < len; i++)
        {
                if (documents[i]->is_valid)
                {
                        g_return_if_fail(!documents[i]->changed);
                }
        }
        main_status.closing_all = TRUE;

        foreach_document(i)
        {
                document_close(documents[i]);
        }

        main_status.closing_all = FALSE;
}


gboolean document_close_all(void)
{
        if (! document_account_for_unsaved())
                return FALSE;

        force_close_all();

        return TRUE;
}


static void monitor_reload_file(GeanyDocument *doc)
{
        gchar *base_name = g_path_get_basename(doc->file_name);
        gint ret;

        ret = dialogs_show_prompt(NULL,
                GTK_STOCK_CLOSE, GTK_RESPONSE_CLOSE,
                GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
                _("_Reload"), GTK_RESPONSE_ACCEPT,
                _("Do you want to reload it?"),
                _("The file '%s' on the disk is more recent than\nthe current buffer."),
                base_name);
        g_free(base_name);

        if (ret == GTK_RESPONSE_ACCEPT)
                document_reload_file(doc, doc->encoding);
        else if (ret == GTK_RESPONSE_CLOSE)
                document_close(doc);
}


static gboolean monitor_resave_missing_file(GeanyDocument *doc)
{
        gboolean want_reload = FALSE;
        gboolean file_saved = FALSE;
        gint ret;

        ret = dialogs_show_prompt(NULL,
                _("Close _without saving"), GTK_RESPONSE_CLOSE,
                GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
                GTK_STOCK_SAVE, GTK_RESPONSE_ACCEPT,
                _("Try to resave the file?"),
                _("File \"%s\" was not found on disk!"),
                doc->file_name);
        if (ret == GTK_RESPONSE_ACCEPT)
        {
                file_saved = dialogs_show_save_as();
                want_reload = TRUE;
        }
        else if (ret == GTK_RESPONSE_CLOSE)
        {
                document_close(doc);
        }
        if (ret != GTK_RESPONSE_CLOSE && ! file_saved)
        {
                /* file is missing - set unsaved state */
                document_set_text_changed(doc, TRUE);
                /* don't prompt more than once */
                setptr(doc->real_path, NULL);
        }

        return want_reload;
}


/* Set force to force a disk check, otherwise it is ignored if there was a check
 * in the last file_prefs.disk_check_timeout seconds.
 * @return @c TRUE if the file has changed. */
gboolean document_check_disk_status(GeanyDocument *doc, gboolean force)
{
        gboolean ret = FALSE;
        gboolean use_gio_filemon;
        time_t cur_time = 0;
        struct stat st;
        gchar *locale_filename;
        FileDiskStatus old_status;

        g_return_val_if_fail(doc != NULL, FALSE);

        /* ignore remote files and documents that have never been saved to disk */
        if (file_prefs.disk_check_timeout == 0 || doc->real_path == NULL || doc->priv->is_remote)
                return FALSE;

        use_gio_filemon = (doc->priv->monitor != NULL);

        if (use_gio_filemon)
        {
                if (doc->priv->file_disk_status != FILE_CHANGED && ! force)
                        return FALSE;
        }
        else
        {
                cur_time = time(NULL);
                if (! force && doc->priv->last_check > (cur_time - file_prefs.disk_check_timeout))
                        return FALSE;

                doc->priv->last_check = cur_time;
        }

        locale_filename = utils_get_locale_from_utf8(doc->file_name);
        if (g_stat(locale_filename, &st) != 0)
        {
                monitor_resave_missing_file(doc);
                /* doc may be closed now */
                ret = TRUE;
        }
        else if (! use_gio_filemon && /* ignore these checks when using GIO */
                         (G_UNLIKELY(doc->priv->mtime > cur_time) || G_UNLIKELY(st.st_mtime > cur_time)))
        {
                g_warning("%s: Something is wrong with the time stamps.", G_STRFUNC);
        }
        else if (doc->priv->mtime < st.st_mtime)
        {
                doc->priv->mtime = st.st_mtime;
                monitor_reload_file(doc);
                /* doc may be closed now */
                ret = TRUE;
        }
        g_free(locale_filename);

        if (DOC_VALID(doc))
        {       /* doc can get invalid when a document was closed */
                old_status = doc->priv->file_disk_status;
                doc->priv->file_disk_status = FILE_OK;
                if (old_status != doc->priv->file_disk_status)
                        ui_update_tab_status(doc);
        }
        return ret;
}