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/*
 * command.c : Handlers to undo & redo commands
 *
 * Author:
 * 	Jody Goldberg <jgoldberg@home.com>
 *
 * (C) 1999, 2000 Jody Goldberg
 */
#include <config.h>
#include "gnumeric-type-util.h"
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#include "gnumeric-util.h"
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#include "commands.h"
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#include "application.h"
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#include "sheet.h"
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#include "workbook.h"
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#include "workbook-view.h"
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#include "ranges.h"
#include "sort.h"
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#include "parse-util.h"
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#include "clipboard.h"
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#include "selection.h"
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#include "datetime.h"
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#include "colrow.h"
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#include "dialogs.h"
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#include "border.h"
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#include "rendered-value.h"
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/*
 * NOTE : This is a work in progress
 *
 * Feel free to lend a hand.  There are several distinct stages to
 * wrapping each command.
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 *
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 * 1) Find the appropriate place(s) in the catch all calls to activations
 * of this logical function.  Be careful.  This should only be called by
 * user initiated actions, not internal commands.
 *
 * 2) Copy the boiler plate code into place and implement the descriptor.
 *
 * 3) Implement the guts of the support functions.
 *
 * That way undo redo just become applications of the old or the new styles.
 *
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 * Design thoughts :
 * 1) redo : this should be renamed 'exec' and should be the place that the
 *    the actual command executes.  This avoid duplicating the code for
 *    application and re-application.
 *
 * 2) The command objects are responsible for generating recalc and redraw
 *    events.  None of the internal utility routines should do so.  Those are
 *    expensive events and should only be done once per command to avoid
 *    duplicating work.
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 *
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 * FIXME: Filter the list of commands when a sheet is deleted.
 *
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 * TODO : Add user preference for undo buffer size limit (# of commands ?)
 * TODO : Possibly clear lists on save.
 *
 * TODO : Reqs for selective undo
 * TODO : Add Repeat last command
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 *
 * Future thoughts
 * - undoable preference setting ?  XL does not have this.  Do we want it ?
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 */
/******************************************************************/

#define GNUMERIC_COMMAND_TYPE        (gnumeric_command_get_type ())
#define GNUMERIC_COMMAND(o)          (GTK_CHECK_CAST ((o), GNUMERIC_COMMAND_TYPE, GnumericCommand))
#define GNUMERIC_COMMAND_CLASS(k)    (GTK_CHECK_CLASS_CAST((k), GNUMERIC_COMMAND_TYPE, GnumericCommandClass))
#define IS_GNUMERIC_COMMAND(o)       (GTK_CHECK_TYPE ((o), GNUMERIC_COMMAND_TYPE))
#define IS_GNUMERIC_COMMAND_CLASS(k) (GTK_CHECK_CLASS_TYPE ((k), GNUMERIC_COMMAND_TYPE))

typedef struct
{
	GtkObject parent;
	char const *cmd_descriptor;	/* A string to put in the menu */
} GnumericCommand;

typedef gboolean (* UndoCmd)(GnumericCommand *this, CommandContext *context);
typedef gboolean (* RedoCmd)(GnumericCommand *this, CommandContext *context);

typedef struct {
	GtkObjectClass parent_class;

	UndoCmd		undo_cmd;
	RedoCmd		redo_cmd;
} GnumericCommandClass;

static GNUMERIC_MAKE_TYPE(gnumeric_command, "GnumericCommand",
			  GnumericCommand, NULL, NULL,
			  gtk_object_get_type());

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/* Store the real GtkObject dtor pointer */
static void (* gtk_object_dtor) (GtkObject *object) = NULL;

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static void
gnumeric_command_destroy (GtkObject *obj)
{
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	GnumericCommand *cmd = GNUMERIC_COMMAND (obj);
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	g_return_if_fail (cmd != NULL);

	/* The const was to avoid accidental changes elsewhere */
	g_free ((gchar *)cmd->cmd_descriptor);
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	/* Call the base class dtor */
	g_return_if_fail (gtk_object_dtor);
	(*gtk_object_dtor) (obj);
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}

#define GNUMERIC_MAKE_COMMAND(type, func) \
static gboolean \
func ## _undo (GnumericCommand *me, CommandContext *context); \
static gboolean \
func ## _redo (GnumericCommand *me, CommandContext *context); \
static void \
func ## _destroy (GtkObject *object); \
static void \
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func ## _class_init (GnumericCommandClass * const parent) \
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{	\
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	parent->undo_cmd = (UndoCmd)& func ## _undo;		\
	parent->redo_cmd = (RedoCmd)& func ## _redo;		\
	if (gtk_object_dtor == NULL)				\
		gtk_object_dtor = parent->parent_class.destroy;	\
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	parent->parent_class.destroy = & func ## _destroy;	\
} \
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static GNUMERIC_MAKE_TYPE_WITH_PARENT(func, #type, type, GnumericCommandClass, func ## _class_init, NULL, \
				      gnumeric_command_get_type())
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/******************************************************************/

/**
 * get_menu_label : Utility routine to get the descriptor associated
 *     with a list of commands.
 *
 * @cmd_list : The command list to check.
 *
 * Returns : A static reference to a descriptor.  DO NOT free this.
 */
static gchar const *
get_menu_label (GSList *cmd_list)
{
	if (cmd_list != NULL) {
		GnumericCommand *cmd = GNUMERIC_COMMAND (cmd_list->data);
		return cmd->cmd_descriptor;
	}

	return NULL;
}

/**
 * undo_redo_menu_labels : Another utility to set the menus correctly.
 *
 * workbook : The book whose undo/redo queues we are modifying
 */
static void
undo_redo_menu_labels (Workbook *wb)
{
	workbook_view_set_undo_redo_state (wb,
					   get_menu_label (wb->undo_commands),
					   get_menu_label (wb->redo_commands));
}

/*
 * command_undo : Undo the last command executed.
 *
 * @context : The command context which issued the request.
 *            Any user level errors generated by undoing will be reported
 *            here.
 *
 * @wb : The workbook whose commands to undo.
 */
void
command_undo (CommandContext *context, Workbook *wb)
{
	GnumericCommand *cmd;
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	GnumericCommandClass *klass;
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	g_return_if_fail (wb != NULL);
	g_return_if_fail (wb->undo_commands != NULL);

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	cmd = GNUMERIC_COMMAND (wb->undo_commands->data);
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	g_return_if_fail (cmd != NULL);

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	klass = GNUMERIC_COMMAND_CLASS(cmd->parent.klass);
	g_return_if_fail (klass != NULL);

	/* TRUE indicates a failure to undo.  Leave the command where it is */
	if (klass->undo_cmd (cmd, context))
		return;

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	wb->undo_commands = g_slist_remove (wb->undo_commands,
					    wb->undo_commands->data);
	wb->redo_commands = g_slist_prepend (wb->redo_commands, cmd);
	undo_redo_menu_labels (wb);
	/* TODO : Should we mark the workbook as clean or pristine too */
}

/*
 * command_redo : Redo the last command that was undone.
 *
 * @context : The command context which issued the request.
 *            Any user level errors generated by redoing will be reported
 *            here.
 *
 * @wb : The workbook whose commands to redo.
 */
void
command_redo (CommandContext *context, Workbook *wb)
{
	GnumericCommand *cmd;
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	GnumericCommandClass *klass;
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	g_return_if_fail (wb);
	g_return_if_fail (wb->redo_commands);

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	cmd = GNUMERIC_COMMAND (wb->redo_commands->data);
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	g_return_if_fail (cmd != NULL);

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	klass = GNUMERIC_COMMAND_CLASS(cmd->parent.klass);
	g_return_if_fail (klass != NULL);

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	/* TRUE indicates a failure to redo.  Leave the command where it is */
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	if (klass->redo_cmd (cmd, context))
		return;

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	/* Remove the command from the undo list */
	wb->redo_commands = g_slist_remove (wb->redo_commands,
					    wb->redo_commands->data);
	wb->undo_commands = g_slist_prepend (wb->undo_commands, cmd);
	undo_redo_menu_labels (wb);
}

/*
 * command_list_release : utility routine to free the resources associated
 *    with a list of commands.
 *
 * @cmd_list : The set of commands to free.
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 *
 * NOTE : remember to NULL the list when you are done.
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 */
void
command_list_release (GSList *cmd_list)
{
	while (cmd_list != NULL) {
		GtkObject *cmd = GTK_OBJECT (cmd_list->data);
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		g_return_if_fail (cmd != NULL);

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		gtk_object_unref (cmd);
		cmd_list = g_slist_remove (cmd_list, cmd_list->data);
	}
}

/**
 * command_push_undo : An internal utility to tack a new command
 *    onto the undo list.
 *
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 * @context : The context that issued the command.
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 * @wb : The workbook the command operated on.
 * @cmd : The new command to add.
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 *
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 * returns : TRUE if there was an error.
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 */
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static gboolean
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command_push_undo (CommandContext *context, Workbook *wb, GtkObject *obj)
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{
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	gboolean trouble;
	GnumericCommand *cmd;
	GnumericCommandClass *klass;

	g_return_val_if_fail (wb, TRUE);

	cmd = GNUMERIC_COMMAND (obj);
	g_return_val_if_fail (cmd != NULL, TRUE);

	klass = GNUMERIC_COMMAND_CLASS(cmd->parent.klass);
	g_return_val_if_fail (klass != NULL, TRUE);

	/* TRUE indicates a failure to do the command */
	trouble = klass->redo_cmd (cmd, context);
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	if  (!trouble) {
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		command_list_release (wb->redo_commands);
		wb->redo_commands = NULL;
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		wb->undo_commands = g_slist_prepend (wb->undo_commands, cmd);
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		undo_redo_menu_labels (wb);
	} else
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		gtk_object_unref (obj);
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	return trouble;
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}

/******************************************************************/

#define CMD_SET_TEXT_TYPE        (cmd_set_text_get_type ())
#define CMD_SET_TEXT(o)          (GTK_CHECK_CAST ((o), CMD_SET_TEXT_TYPE, CmdSetText))

typedef struct
{
	GnumericCommand parent;

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	EvalPos	 pos;
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	gchar		*text;
} CmdSetText;

GNUMERIC_MAKE_COMMAND (CmdSetText, cmd_set_text);

static gboolean
cmd_set_text_undo (GnumericCommand *cmd, CommandContext *context)
{
	CmdSetText *me = CMD_SET_TEXT(cmd);
	Cell *cell;
	char *new_text;

	g_return_val_if_fail (me != NULL, TRUE);

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	/* Get the cell */
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	cell = sheet_cell_get (me->pos.sheet,
			       me->pos.eval.col,
			       me->pos.eval.row);

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	/* Save the new value so we can redo */
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	new_text = (cell == NULL || cell->value == NULL || cell->value->type == VALUE_EMPTY)
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	    ? NULL : cell_get_entered_text (cell);
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	/* Restore the old value if it was not empty */
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	if (me->text != NULL) {
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		if (cell == NULL)
			cell = sheet_cell_new (me->pos.sheet,
					       me->pos.eval.col,
					       me->pos.eval.row);
		sheet_cell_set_text (cell, me->text);
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		g_free (me->text);
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	} else if (cell != NULL)
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		sheet_cell_remove (me->pos.sheet, cell, TRUE);
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	me->text = new_text;
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	sheet_set_dirty (me->pos.sheet, TRUE);
	workbook_recalc (me->pos.sheet->workbook);
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	sheet_update (me->pos.sheet);
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	return FALSE;
}

static gboolean
cmd_set_text_redo (GnumericCommand *cmd, CommandContext *context)
{
	/* Undo and redo are the same for this case */
	return cmd_set_text_undo (cmd, context);
}

static void
cmd_set_text_destroy (GtkObject *cmd)
{
	CmdSetText *me = CMD_SET_TEXT(cmd);
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	if (me->text != NULL) {
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		g_free (me->text);
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		me->text = NULL;
	}
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	gnumeric_command_destroy (cmd);
}

gboolean
cmd_set_text (CommandContext *context,
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	      Sheet *sheet, CellPos const *pos,
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	      char *new_text)
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{
	static int const max_descriptor_width = 15;

	GtkObject *obj;
	CmdSetText *me;
	gchar *pad = "";
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	gchar *text;
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	Cell const *cell;
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	g_return_val_if_fail (sheet != NULL, TRUE);
	g_return_val_if_fail (new_text != NULL, TRUE);

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	/* Ensure that we are not splitting up an array */
	cell = sheet_cell_get (sheet, pos->col, pos->row);
	if (cell_is_partial_array (cell)) {
		gnumeric_error_splits_array (context);
		return TRUE;
	}

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	/* From src/dialogs/dialog-autocorrect.c */
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	autocorrect_tool (new_text);
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	obj = gtk_type_new (CMD_SET_TEXT_TYPE);
	me = CMD_SET_TEXT (obj);

	/* Store the specs for the object */
	me->pos.sheet = sheet;
	me->pos.eval = *pos;
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	me->text = g_strdup (new_text);
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	/* Limit the size of the descriptor to something reasonable */
	if (strlen(new_text) > max_descriptor_width) {
		pad = "..."; /* length of 3 */
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		text = g_strndup (new_text,
				  max_descriptor_width - 3);
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	} else
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		text = (gchar *) new_text;
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	me->parent.cmd_descriptor =
	    g_strdup_printf (_("Typing \"%s%s\" in %s"), text, pad,
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			     cell_pos_name(pos));
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	if (*pad)
		g_free (text);
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	/* Register the command object */
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	return command_push_undo (context, sheet->workbook, obj);
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}

/******************************************************************/

#define CMD_AREA_SET_TEXT_TYPE        (cmd_area_set_text_get_type ())
#define CMD_AREA_SET_TEXT(o)          (GTK_CHECK_CAST ((o), CMD_AREA_SET_TEXT_TYPE, CmdAreaSetText))

typedef struct
{
	GnumericCommand parent;

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	EvalPos	 pos;
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	char 	*text; 
	gboolean as_array;
	GSList	*old_content;
	GSList	*selection;
} CmdAreaSetText;

GNUMERIC_MAKE_COMMAND (CmdAreaSetText, cmd_area_set_text);

static gboolean
cmd_area_set_text_undo (GnumericCommand *cmd, CommandContext *context)
{
	CmdAreaSetText *me = CMD_AREA_SET_TEXT (cmd);
	GSList *ranges;

	g_return_val_if_fail (me != NULL, TRUE);
	g_return_val_if_fail (me->selection != NULL, TRUE);
	g_return_val_if_fail (me->old_content != NULL, TRUE);

	for (ranges = me->selection; ranges != NULL ; ranges = ranges->next) {
		Range const * const r = ranges->data;
		CellRegion * c;

		g_return_val_if_fail (me->old_content != NULL, TRUE);

		c = me->old_content->data;
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		clipboard_paste_region (context, c, me->pos.sheet,
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					r->start.col, r->start.row,
					PASTE_VALUES, GDK_CURRENT_TIME);
		clipboard_release (c);
		me->old_content = g_slist_remove (me->old_content, c);
	}
	g_return_val_if_fail (me->old_content == NULL, TRUE);

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	sheet_set_dirty (me->pos.sheet, TRUE);
	workbook_recalc (me->pos.sheet->workbook);
	sheet_update (me->pos.sheet);
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	return FALSE;
}

static gboolean
cmd_area_set_text_redo (GnumericCommand *cmd, CommandContext *context)
{
	CmdAreaSetText *me = CMD_AREA_SET_TEXT (cmd);
	ExprTree *expr = NULL;
	GSList *l;
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	char const *start;
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	g_return_val_if_fail (me != NULL, TRUE);

	/* Check for array subdivision */
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	if (selection_check_for_array (me->pos.sheet, me->selection)) {
		gnumeric_error_splits_array (context);
		return TRUE;
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	}

	/*
	 * Only enter an array formula if
	 *   1) the text is a formula
	 *   2) It's entered as an array formula
	 *   3) There is only one 1 selection
	 */
	l = me->selection;
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	start = gnumeric_char_start_expr_p (me->text);
	if (start != NULL && me->as_array && l != NULL && l->next == NULL) {
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		char *error_string = NULL;
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		ParsePos pp;
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		expr = expr_parse_string (start,
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		    parse_pos_init_evalpos (&pp, &me->pos),
		    NULL, &error_string);
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		if (expr == NULL)
			return TRUE;
	}

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	/* Everything is ok. Store previous contents and perform the operation */
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	for (l = me->selection ; l != NULL ; l = l->next) {
		Range const * const r = l->data;
		me->old_content = g_slist_prepend (me->old_content,
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			clipboard_copy_cell_range (me->pos.sheet,
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						   r->start.col, r->start.row,
						   r->end.col, r->end.row));

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		/* If there is an expression then this was an array */
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		if (expr != NULL) 
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			cell_set_array_formula (me->pos.sheet,
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						r->start.row, r->start.col,
						r->end.row, r->end.col,
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						expr, TRUE);
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		else
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			sheet_range_set_text (&me->pos, r, me->text);
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	}

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	sheet_set_dirty (me->pos.sheet, TRUE);
	workbook_recalc (me->pos.sheet->workbook);
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	/*
	 * Now that things have been filled in and recalculated we can generate
	 * the spans.  Non expression cells need to be rendered.
	 * TODO : We could be smarter here.  Only the left and
	 * right columns can span,
	 * so there is no need to check the middles.
	 */
	for (l = me->selection ; l != NULL ; l = l->next) {
		Range const * const r = l->data;
		sheet_range_calc_spans (me->pos.sheet, *r, SPANCALC_RENDER);
	}

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	sheet_update (me->pos.sheet);
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	return FALSE;
}
static void
cmd_area_set_text_destroy (GtkObject *cmd)
{
	CmdAreaSetText *me = CMD_AREA_SET_TEXT (cmd);

	g_free (me->text);

	if (me->old_content != NULL) {
		GSList *l;
		for (l = me->old_content ; l != NULL ; l = g_slist_remove (l, l->data))
			clipboard_release (l->data);
		me->old_content = NULL;
	}
	if (me->selection != NULL) {
		GSList *l;
		for (l = me->selection ; l != NULL ; l = g_slist_remove (l, l->data))
			g_free (l->data);
		me->selection = NULL;
	}

	gnumeric_command_destroy (cmd);
}

gboolean
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cmd_area_set_text (CommandContext *context, EvalPos const *pos,
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		   char const *new_text, gboolean as_array)
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{
	static int const max_descriptor_width = 15;

	GtkObject *obj;
	CmdAreaSetText *me;
	gchar *text, *pad = "";

	obj = gtk_type_new (CMD_AREA_SET_TEXT_TYPE);
	me = CMD_AREA_SET_TEXT (obj);

	/* Store the specs for the object */
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	me->pos         = *pos;
	me->text        = g_strdup (new_text);
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	me->as_array    = as_array;
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	me->selection   = selection_get_ranges (pos->sheet, FALSE /* No intersection */);
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	me->old_content = NULL;

	if (strlen(new_text) > max_descriptor_width) {
		pad = "..."; /* length of 3 */
		text = g_strndup (new_text,
				  max_descriptor_width - 3);
	} else
		text = (gchar *) new_text;

	me->parent.cmd_descriptor =
	    g_strdup_printf (_("Typing \"%s%s\""), text, pad);

	if (*pad)
		g_free (text);

	/* Register the command object */
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	return command_push_undo (context, pos->sheet->workbook, obj);
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}

/******************************************************************/

#define CMD_INS_DEL_ROW_COL_TYPE        (cmd_ins_del_row_col_get_type ())
#define CMD_INS_DEL_ROW_COL(o)          (GTK_CHECK_CAST ((o), CMD_INS_DEL_ROW_COL_TYPE, CmdInsDelRowCol))

typedef struct
{
	GnumericCommand parent;

	Sheet		*sheet;
	gboolean	 is_insert;
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	gboolean	 is_cols;
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	int		 index;
	int		 count;

	double		*sizes;
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	CellRegion 	*contents;
	GSList		*reloc_storage;
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} CmdInsDelRowCol;

GNUMERIC_MAKE_COMMAND (CmdInsDelRowCol, cmd_ins_del_row_col);

static gboolean
cmd_ins_del_row_col_undo (GnumericCommand *cmd, CommandContext *context)
{
	CmdInsDelRowCol *me = CMD_INS_DEL_ROW_COL(cmd);
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	int index;
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	GSList *tmp = NULL;
	gboolean trouble;
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	g_return_val_if_fail (me != NULL, TRUE);
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	g_return_val_if_fail (me->sizes != NULL, TRUE);
	g_return_val_if_fail (me->contents != NULL, TRUE);
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	if (!me->is_insert) {
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		index = me->index;
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		if (me->is_cols)
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			trouble = sheet_insert_cols (context, me->sheet, me->index, me->count, &tmp);
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		else
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			trouble = sheet_insert_rows (context, me->sheet, me->index, me->count, &tmp);
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	} else {
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		index = ((me->is_cols) ? SHEET_MAX_COLS : SHEET_MAX_ROWS) - me->count;
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		if (me->is_cols)
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			trouble = sheet_delete_cols (context, me->sheet, me->index, me->count, &tmp);
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		else
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			trouble = sheet_delete_rows (context, me->sheet, me->index, me->count, &tmp);
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	}
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	/* restore row/col sizes */
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	sheet_restore_row_col_sizes (me->sheet, me->is_cols, index, me->count,
				     me->sizes);
	me->sizes = NULL;
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	/* restore row/col contents */
	if (me->is_cols)
		clipboard_paste_region (context, me->contents, me->sheet,
					index, 0, PASTE_ALL_TYPES,
					GDK_CURRENT_TIME);
	else
		clipboard_paste_region (context, me->contents, me->sheet,
					0, index, PASTE_ALL_TYPES,
					GDK_CURRENT_TIME);
	clipboard_release (me->contents);
	me->contents = NULL;

	/* Throw away the undo info for the expressions after the action*/
	workbook_expr_unrelocate_free (tmp);

	/* Restore the changed expressions before the action */
	workbook_expr_unrelocate (me->sheet->workbook, me->reloc_storage);
	me->reloc_storage = NULL;

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	sheet_set_dirty (me->sheet, TRUE);
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	workbook_recalc (me->sheet->workbook);
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	sheet_update (me->sheet);
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	/* Ins/Del Row/Col unants things */
	application_clipboard_unant ();

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	return trouble;
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}

static gboolean
cmd_ins_del_row_col_redo (GnumericCommand *cmd, CommandContext *context)
{
	CmdInsDelRowCol *me = CMD_INS_DEL_ROW_COL(cmd);
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	gboolean trouble;
	int index;
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	g_return_val_if_fail (me != NULL, TRUE);
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	g_return_val_if_fail (me->sizes == NULL, TRUE);
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	g_return_val_if_fail (me->contents == NULL, TRUE);

	index = (me->is_insert)
	    ? (((me->is_cols) ? SHEET_MAX_COLS : SHEET_MAX_ROWS) - me->count)
	    : me->index;

	me->sizes = sheet_save_row_col_sizes (me->sheet, me->is_cols,
					      index, me->count);
	me->contents = (me->is_cols)
	    ? clipboard_copy_cell_range (me->sheet,
					 index,			0,
					 index + me->count - 1,	SHEET_MAX_ROWS-1)
	    : clipboard_copy_cell_range  (me->sheet,
					  0,			index,
					  SHEET_MAX_COLS-1,	index + me->count - 1);
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	if (me->is_insert) {
		if (me->is_cols)
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			trouble = sheet_insert_cols (context, me->sheet, me->index,
						     me->count, &me->reloc_storage);
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		else
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			trouble = sheet_insert_rows (context, me->sheet, me->index,
						     me->count, &me->reloc_storage);
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	} else {
		if (me->is_cols)
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			trouble = sheet_delete_cols (context, me->sheet, me->index,
						     me->count, &me->reloc_storage);
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		else
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			trouble =sheet_delete_rows (context, me->sheet, me->index,
						    me->count, &me->reloc_storage);
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	}

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	sheet_set_dirty (me->sheet, TRUE);
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	workbook_recalc (me->sheet->workbook);
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	sheet_update (me->sheet);
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	/* Ins/Del Row/Col unants things */
	application_clipboard_unant ();

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	return trouble;
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}
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static void
cmd_ins_del_row_col_destroy (GtkObject *cmd)
{
	CmdInsDelRowCol *me = CMD_INS_DEL_ROW_COL(cmd);
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	if (me->sizes) {
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		g_free (me->sizes);
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		me->sizes = NULL;
	}
	if (me->contents) {
		clipboard_release (me->contents);
		me->contents = NULL;
	}
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	gnumeric_command_destroy (cmd);
}

static gboolean
cmd_ins_del_row_col (CommandContext *context,
		     Sheet *sheet,
		     gboolean is_col, gboolean is_insert,
		     char const * descriptor, int index, int count)
{
	GtkObject *obj;
	CmdInsDelRowCol *me;

	g_return_val_if_fail (sheet != NULL, TRUE);

	obj = gtk_type_new (CMD_INS_DEL_ROW_COL_TYPE);
	me = CMD_INS_DEL_ROW_COL (obj);

	/* Store the specs for the object */
	me->sheet = sheet;
	me->is_cols = is_col;
	me->is_insert = is_insert;
	me->index = index;
	me->count = count;
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	me->sizes = NULL;
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	me->contents = NULL;
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	me->parent.cmd_descriptor = descriptor;

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	/* Register the command object */
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	return command_push_undo (context, sheet->workbook, obj);
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}

gboolean
cmd_insert_cols (CommandContext *context,
		 Sheet *sheet, int start_col, int count)
{
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	char *mesg = g_strdup_printf ((count > 1)
				      ? _("Inserting %d columns before %s")
				      : _("Inserting %d column before %s"), count,
				      col_name(start_col));
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	return cmd_ins_del_row_col (context, sheet, TRUE, TRUE, mesg,
				    start_col, count);
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}

gboolean
cmd_insert_rows (CommandContext *context,
		 Sheet *sheet, int start_row, int count)
{
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	char *mesg = g_strdup_printf ((count > 1)
				      ? _("Inserting %d rows before %d")
				      : _("Inserting %d row before %d"),
				      count, start_row+1);
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	return cmd_ins_del_row_col (context, sheet, FALSE, TRUE, mesg,
				    start_row, count);
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}

gboolean
cmd_delete_cols (CommandContext *context,
		 Sheet *sheet, int start_col, int count)
{
	char *mesg;
	if (count > 1) {
		/* col_name uses a static buffer */
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		char *temp = g_strdup_printf (_("Deleting %d columns %s:"),
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					      count, col_name(start_col));
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		mesg = g_strconcat (temp, col_name(start_col+count-1), NULL);
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		g_free (temp);
	} else
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		mesg = g_strdup_printf (_("Deleting column %s"), col_name(start_col));
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	return cmd_ins_del_row_col (context, sheet, TRUE, FALSE, mesg, start_col, count);
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}

gboolean
cmd_delete_rows (CommandContext *context,
		 Sheet *sheet, int start_row, int count)
{
	char *mesg = (count > 1)
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	    ? g_strdup_printf (_("Deleting %d rows %d:%d"), count, start_row,
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			       start_row+count-1)
	    : g_strdup_printf (_("Deleting row %d"), start_row);

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	return cmd_ins_del_row_col (context, sheet, FALSE, FALSE, mesg, start_row, count);
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}

/******************************************************************/

#define CMD_CLEAR_TYPE        (cmd_clear_get_type ())
#define CMD_CLEAR(o)          (GTK_CHECK_CAST ((o), CMD_CLEAR_TYPE, CmdClear))

typedef struct
{
	GnumericCommand parent;
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	int	 clear_flags;
	int	 paste_flags;
	Sheet	*sheet;
	GSList 	*old_content;
	GSList	*selection;
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} CmdClear;

GNUMERIC_MAKE_COMMAND (CmdClear, cmd_clear);

static gboolean
cmd_clear_undo (GnumericCommand *cmd, CommandContext *context)
{
	CmdClear *me = CMD_CLEAR(cmd);
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	GSList *ranges;
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	g_return_val_if_fail (me != NULL, TRUE);
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	g_return_val_if_fail (me->selection != NULL, TRUE);
	g_return_val_if_fail (me->old_content != NULL, TRUE);

	for (ranges = me->selection; ranges != NULL ; ranges = ranges->next) {
		Range const * const r = ranges->data;
		CellRegion * c;

		g_return_val_if_fail (me->old_content != NULL, TRUE);

		c = me->old_content->data;
		clipboard_paste_region (context, c, me->sheet,
					r->start.col, r->start.row,
					me->paste_flags,
					GDK_CURRENT_TIME);
		clipboard_release (c);
		me->old_content = g_slist_remove (me->old_content, c);
	}
	g_return_val_if_fail (me->old_content == NULL, TRUE);

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	sheet_set_dirty (me->sheet, TRUE);
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	workbook_recalc (me->sheet->workbook);
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	sheet_update (me->sheet);
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	return FALSE;
}

static gboolean
cmd_clear_redo (GnumericCommand *cmd, CommandContext *context)
{
	CmdClear *me = CMD_CLEAR(cmd);
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	GSList *l;
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	g_return_val_if_fail (me != NULL, TRUE);
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	g_return_val_if_fail (me->selection != NULL, TRUE);
	g_return_val_if_fail (me->old_content == NULL, TRUE);

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	/* Check for array subdivision */
	if (selection_check_for_array (me->sheet, me->selection)) {
		gnumeric_error_splits_array (context);
		return TRUE;
	}

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	for (l = me->selection ; l != NULL ; l = l->next) {
		Range const * const r = l->data;
		me->old_content =
			g_slist_prepend (me->old_content,
				clipboard_copy_cell_range (me->sheet,
							   r->start.col, r->start.row,
							   r->end.col, r->end.row));

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		/* We have already checked the arrays */
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		sheet_clear_region (context, me->sheet,
				    r->start.col, r->start.row,
				    r->end.col, r->end.row,
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				    me->clear_flags|CLEAR_NOCHECKARRAY);
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	}

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	sheet_set_dirty (me->sheet, TRUE);
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	workbook_recalc (me->sheet->workbook);
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	sheet_update (me->sheet);
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	return FALSE;
}
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static void
cmd_clear_destroy (GtkObject *cmd)
{
	CmdClear *me = CMD_CLEAR(cmd);
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	if (me->old_content != NULL) {
		GSList *l;
		for (l = me->old_content ; l != NULL ; l = g_slist_remove (l, l->data))
			clipboard_release (l->data);
		me->old_content = NULL;
	}
	if (me->selection != NULL) {
		GSList *l;
		for (l = me->selection ; l != NULL ; l = g_slist_remove (l, l->data))
			g_free (l->data);
		me->selection = NULL;
	}

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	gnumeric_command_destroy (cmd);
}

gboolean
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cmd_clear_selection (CommandContext *context, Sheet *sheet, int clear_flags)
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{
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	GtkObject *obj;
	CmdClear *me;

	g_return_val_if_fail (sheet != NULL, TRUE);

	obj = gtk_type_new (CMD_CLEAR_TYPE);
	me = CMD_CLEAR (obj);

	/* Store the specs for the object */
	me->sheet = sheet;
	me->clear_flags = clear_flags;
	me->old_content = NULL;
	me->selection = selection_get_ranges (sheet, FALSE /* No intersection */);

	me->paste_flags = 0;
	if (clear_flags & CLEAR_VALUES)
		me->paste_flags |= PASTE_VALUES | PASTE_FORMULAS;
	if (clear_flags & CLEAR_FORMATS)
		me->paste_flags |= PASTE_FORMATS;
	if (clear_flags & CLEAR_COMMENTS)
		g_warning ("Deleted comments can not be restored yet");

	/* TODO : Something more descriptive ? maybe the range name */
	me->parent.cmd_descriptor = g_strdup (_("Clear"));

	/* Register the command object */
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	return command_push_undo (context, sheet->workbook, obj);
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}

/******************************************************************/

#define CMD_FORMAT_TYPE        (cmd_format_get_type ())
#define CMD_FORMAT(o)          (GTK_CHECK_CAST ((o), CMD_FORMAT_TYPE, CmdFormat))

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typedef struct {
	CellPos pos;
	GList  *styles;
} CmdFormatOldStyle;
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typedef struct {
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	GnumericCommand parent;
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	Sheet         *sheet;
	GSList        *selection;

	GSList        *old_styles;

	MStyle        *new_style;
	MStyleBorder **borders;
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} CmdFormat;

GNUMERIC_MAKE_COMMAND (CmdFormat, cmd_format);

static gboolean
cmd_format_undo (GnumericCommand *cmd, CommandContext *context)
{
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	CmdFormat *me = CMD_FORMAT (cmd);
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	g_return_val_if_fail (me != NULL, TRUE);

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	if (me->old_styles) {
		GSList *l;

		for (l = me->old_styles; l; l = l->next) {
			CmdFormatOldStyle *os = l->data;

			sheet_style_attach_list (me->sheet, os->styles,
						 &os->pos, FALSE);
		}
	}
	
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	sheet_set_dirty (me->sheet, TRUE);
	workbook_recalc (me->sheet->workbook);
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	sheet_update (me->sheet);

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	return FALSE;
}

static gboolean
cmd_format_redo (GnumericCommand *cmd, CommandContext *context)
{
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	CmdFormat *me = CMD_FORMAT (cmd);
	GSList    *l;
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	g_return_val_if_fail (me != NULL, TRUE);

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	for (l = me->selection; l; l = l->next) {
		if (me->borders)
			sheet_range_set_border (me->sheet, l->data,
						me->borders);
		if (me->new_style) {
			mstyle_ref (me->new_style);
			sheet_range_apply_style (me->sheet, l->data,
						 me->new_style);
		}
	}

	sheet_set_dirty (me->sheet, TRUE);
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	workbook_recalc (me->sheet->workbook);
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	sheet_update (me->sheet);
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	return FALSE;
}
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static void
cmd_format_destroy (GtkObject *cmd)
{
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	CmdFormat *me = CMD_FORMAT (cmd);
	int        i;

	if (me->new_style)
		mstyle_unref (me->new_style);
	me->new_style = NULL;

	if (me->borders) {
		for (i = STYLE_BORDER_TOP; i < STYLE_BORDER_EDGE_MAX; i++)
			style_border_unref (me->borders [i]);
		g_free (me->borders);
		me->borders = NULL;
	}

	if (me->old_styles != NULL) {
		GSList *l;

		for (l = me->old_styles ; l != NULL ; l = g_slist_remove (l, l->data)) {
			CmdFormatOldStyle *os = l->data;

			if (os->styles)
				sheet_style_list_destroy (os->styles);

			g_free (os);
		}
		me->old_styles = NULL;
	}

	if (me->selection != NULL) {
		GSList *l;
		for (l = me->selection ; l != NULL ; l = g_slist_remove (l, l->data))
			g_free (l->data);
		me->selection = NULL;
	}
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	gnumeric_command_destroy (cmd);
}

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/**
 * cmd_format:
 * @context: the context.
 * @sheet: the sheet
 * @style: style to apply to the selection
 * @borders: borders to apply to the selection
 * 
 *  If borders is non NULL, then the MStyleBorder references are passed,
 * the MStyle reference is also passed.
 * 
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 * Return value: TRUE if there was a problem
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 **/
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gboolean
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cmd_format (CommandContext *context, Sheet *sheet,
	    MStyle *style, MStyleBorder **borders)
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{
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	GtkObject *obj;
	CmdFormat *me;
	GSList    *l;

	g_return_val_if_fail (sheet != NULL, TRUE);

	obj = gtk_type_new (CMD_FORMAT_TYPE);
	me = CMD_FORMAT (obj);

	me->sheet      = sheet;
	me->selection  = selection_get_ranges (sheet, FALSE); /* TRUE ? */
	me->new_style  = style;

	me->old_styles = NULL;
	for (l = me->selection; l; l = l->next) {
		CmdFormatOldStyle *os;
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		Range range = *((Range const *)l->data);

		/* Store the containing range to handle borders */
		if (range.start.col > 0) range.start.col--;
		if (range.start.row > 0) range.start.row--;
		if (range.end.col < SHEET_MAX_COLS-1) range.end.col++;
		if (range.end.row < SHEET_MAX_ROWS-1) range.end.row++;
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		os = g_new (CmdFormatOldStyle, 1);

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		os->styles = sheet_get_styles_in_range (sheet, &range);
		os->pos = range.start;
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		me->old_styles = g_slist_append (me->old_styles, os);
	}

	if (borders) {
		int i;

		me->borders = g_new (MStyleBorder *, STYLE_BORDER_EDGE_MAX);
		for (i = STYLE_BORDER_TOP; i < STYLE_BORDER_EDGE_MAX; i++)
			me->borders [i] = borders [i];
	} else
		me->borders = NULL;

	me->parent.cmd_descriptor = g_strdup (_("Format cells"));

	/* Register the command object */
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	return command_push_undo (context, sheet->workbook, obj);
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}

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/******************************************************************/

#define CMD_RENAME_SHEET_TYPE        (cmd_rename_sheet_get_type ())
#define CMD_RENAME_SHEET(o)          (GTK_CHECK_CAST ((o), CMD_RENAME_SHEET_TYPE, CmdRenameSheet))

typedef struct
{
	GnumericCommand parent;

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	Workbook *wb;
	char *old_name, *new_name;
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} CmdRenameSheet;

GNUMERIC_MAKE_COMMAND (CmdRenameSheet, cmd_rename_sheet);

static gboolean
cmd_rename_sheet_undo (GnumericCommand *cmd, CommandContext *context)
{
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	CmdRenameSheet *me = CMD_RENAME_SHEET (cmd);
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	g_return_val_if_fail (me != NULL, TRUE);

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	return workbook_rename_sheet (context, me->wb,
				      me->new_name, me->old_name);
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}

static gboolean
cmd_rename_sheet_redo (GnumericCommand *cmd, CommandContext *context)
{
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	CmdRenameSheet *me = CMD_RENAME_SHEET (cmd);
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	g_return_val_if_fail (me != NULL, TRUE);

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	return workbook_rename_sheet (context, me->wb,
				      me->old_name, me->new_name);
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}
static void
cmd_rename_sheet_destroy (GtkObject *cmd)
{
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	CmdRenameSheet *me = CMD_RENAME_SHEET (cmd);
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	me->wb = NULL;
	g_free (me->old_name);
	g_free (me->new_name);
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	gnumeric_command_destroy (cmd);
}

gboolean
cmd_rename_sheet (CommandContext *context,
		  Workbook *wb, const char *old_name, const char *new_name)
{
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	GtkObject *obj;
	CmdRenameSheet *me;

	g_return_val_if_fail (wb != NULL, TRUE);

	obj = gtk_type_new (CMD_RENAME_SHEET_TYPE);
	me = CMD_RENAME_SHEET (obj);

	/* Store the specs for the object */
	me->wb = wb;
	me->old_name = g_strdup (old_name);
	me->new_name = g_strdup (new_name);

	me->parent.cmd_descriptor = 
	    g_strdup_printf (_("Rename sheet '%s' '%s'"), old_name, new_name);

	/* Register the command object */
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	return command_push_undo (context, wb, obj);
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}

/******************************************************************/

#define CMD_SET_DATE_TIME_TYPE        (cmd_set_date_time_get_type ())
#define CMD_SET_DATE_TIME(o)          (GTK_CHECK_CAST ((o), CMD_SET_DATE_TIME_TYPE, CmdSetDateTime))

typedef struct
{
	GnumericCommand parent;

	gboolean	 is_date;
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	EvalPos	 pos;
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	gchar		*contents;
} CmdSetDateTime;

GNUMERIC_MAKE_COMMAND (CmdSetDateTime, cmd_set_date_time);

static gboolean
cmd_set_date_time_undo (GnumericCommand *cmd, CommandContext *context)
{
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	CmdSetDateTime *me = CMD_SET_DATE_TIME (cmd);
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	Cell  *cell;
	Sheet *sheet;
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	g_return_val_if_fail (me != NULL, TRUE);

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	sheet = me->pos.sheet;

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	/* Get the cell */
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	cell = sheet_cell_get (sheet, me->pos.eval.col, me->pos.eval.row);
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