File: sat-pref-qth.c

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gpredict 1.1-7
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/*
  Gpredict: Real-time satellite tracking and orbit prediction program

  Copyright (C)  2001-2009  Alexandru Csete, OZ9AEC.

  Authors: Alexandru Csete <oz9aec@gmail.com>

  Comments, questions and bugreports should be submitted via
  http://sourceforge.net/projects/gpredict/
  More details can be found at the project home page:

  http://gpredict.oz9aec.net/
 
  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, visit http://www.fsf.org/
*/
#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <glib/gstdio.h>
#ifdef HAVE_CONFIG_H
#  include <build-config.h>
#endif
#include "gpredict-utils.h"
#include "sat-cfg.h"
#include "sat-log.h"
#include "qth-data.h"
#include "sat-pref-qth.h"
#include "sat-pref-qth-data.h"
#include "sat-pref-qth-editor.h"
#include "locator.h"
#include "compat.h"



extern GtkWidget *window; /* dialog window defined in sat-pref.c */


static GtkWidget *addbutton;
static GtkWidget *editbutton;
static GtkWidget *delbutton;
static gulong     handler_id;

static GtkWidget *qthlist; /* we need access to this from the ok and cancel functions */


/* private function prototypes */
static GtkWidget    *create_qth_list       (void);
static GtkTreeModel *create_and_fill_model (void);
static guint         read_qth_file         (GtkListStore *liststore,
											gchar *filename);
static GtkWidget    *create_buttons        (GtkTreeView *qthlist);
static void          default_toggled       (GtkCellRendererToggle *cell,
											gchar                 *path_str,
											gpointer               data);

static gboolean      clear_default_flags      (GtkTreeModel *model,
											   GtkTreePath *path,
											   GtkTreeIter *iter,
											   gpointer defqth);

static void          float_cell_data_function (GtkTreeViewColumn *col,
											   GtkCellRenderer   *renderer,
											   GtkTreeModel      *model,
											   GtkTreeIter       *iter,
											   gpointer           column);

static void add_cb    (GtkWidget *button, gpointer data);
static void edit_cb   (GtkWidget *button, gpointer data);
static void delete_cb (GtkWidget *button, gpointer data);

/* static gboolean check_and_set_default_qth (GtkTreeModel *model, */
/* 										   GtkTreePath  *path, */
/* 										   GtkTreeIter  *iter, */
/* 										   gpointer      data); */

static gboolean save_qth (GtkTreeModel *model,
						  GtkTreePath  *path,
						  GtkTreeIter  *iter,
						  gpointer      data);

static void delete_location_files (void);


static gboolean convert_qth_altitude (GtkTreeModel *model,
									  GtkTreePath  *path,
									  GtkTreeIter  *iter,
									  gpointer      data);


/** \brief Create and initialise widgets for the locations prefs tab.
 *
 * The QTH tab consists of two main parts: A list showing the configured
 * locations (.qth files in USER_CONF_DIR/ and three buttons beside the list:
 *    Add      Add a new location to the list
 *    Edit     Edit selected location
 *    Delete   Delete selected location
 *
 * \note This module uses the gtk-sat-data infrastructure to read and write
 *       .qth files.
 *
 * Add button always active.
 * The other buttons are active only if a row is selected.
 *
 */
GtkWidget *sat_pref_qth_create ()
{
	
	GtkWidget *vbox;    /* vbox containing the list part and the details part */
	GtkWidget *swin;


	vbox = gtk_vbox_new (FALSE, 10);
	gtk_container_set_border_width (GTK_CONTAINER (vbox), 10);

	/* create qth list and pack into scrolled window */
	qthlist = create_qth_list ();
	swin = gtk_scrolled_window_new (NULL, NULL);
	gtk_container_add (GTK_CONTAINER (swin), qthlist);

	gtk_box_pack_start (GTK_BOX (vbox), swin, TRUE, TRUE, 0);
	gtk_box_pack_start (GTK_BOX (vbox),
						create_buttons (GTK_TREE_VIEW (qthlist)),
						FALSE, FALSE, 0);

	return vbox;
}


/** \brief User pressed cancel. Any changes to config must be cancelled.
 */
void
sat_pref_qth_cancel ()
{

}


/** \brief User pressed OK. Any changes should be stored in config.
 */
void
sat_pref_qth_ok     ()
{

	delete_location_files ();

	gtk_tree_model_foreach (gtk_tree_view_get_model(GTK_TREE_VIEW(qthlist)),
							save_qth,
							NULL);
}


/** \brief Create QTH list widgets.
 *
 */
static GtkWidget *
create_qth_list ()
{
	GtkTreeModel      *model;
	GtkCellRenderer   *renderer;
	GtkTreeViewColumn *column;


	qthlist = gtk_tree_view_new ();

	model = create_and_fill_model ();
	gtk_tree_view_set_model (GTK_TREE_VIEW (qthlist), model);
	g_object_unref (model);

	/* name column */
	renderer = gtk_cell_renderer_text_new ();
	column = gtk_tree_view_column_new_with_attributes (_("Name"), renderer,
													   "text", QTH_LIST_COL_NAME,
													   NULL);
	gtk_tree_view_insert_column (GTK_TREE_VIEW (qthlist), column, -1);

	/* location column */
	renderer = gtk_cell_renderer_text_new ();
	column = gtk_tree_view_column_new_with_attributes (_("Location"), renderer,
													   "text", QTH_LIST_COL_LOC,
													   NULL);
	gtk_tree_view_insert_column (GTK_TREE_VIEW (qthlist), column, -1);

	/* lat column */
	renderer = gtk_cell_renderer_text_new ();
	column = gtk_tree_view_column_new_with_attributes (_("Lat"), renderer,
													   "text", QTH_LIST_COL_LAT,
													   NULL);
	gtk_tree_view_column_set_alignment (column, 0.5);
	gtk_tree_view_column_set_cell_data_func (column,
											 renderer,
											 float_cell_data_function,
											 GUINT_TO_POINTER (QTH_LIST_COL_LAT),
											 NULL);
	gtk_tree_view_insert_column (GTK_TREE_VIEW (qthlist), column, -1);

	/* lon column */
	renderer = gtk_cell_renderer_text_new ();
	column = gtk_tree_view_column_new_with_attributes (_("Lon"), renderer,
													   "text", QTH_LIST_COL_LON,
													   NULL);
	gtk_tree_view_column_set_alignment (column, 0.5);
	gtk_tree_view_column_set_cell_data_func (column,
											 renderer,
											 float_cell_data_function,
											 GUINT_TO_POINTER (QTH_LIST_COL_LON),
											 NULL);
	gtk_tree_view_insert_column (GTK_TREE_VIEW (qthlist), column, -1);

	/* alt column */
	renderer = gtk_cell_renderer_text_new ();
	if (sat_cfg_get_bool (SAT_CFG_BOOL_USE_IMPERIAL)) {
		column = gtk_tree_view_column_new_with_attributes (_("Alt (ft)"),
														   renderer,
														   "text", QTH_LIST_COL_ALT,
														   NULL);
	}
	else {
		column = gtk_tree_view_column_new_with_attributes (_("Alt (m)"), renderer,
														   "text", QTH_LIST_COL_ALT,
														   NULL);
	}
	gtk_tree_view_insert_column (GTK_TREE_VIEW (qthlist), column, -1);
	gtk_tree_view_column_set_alignment (column, 0.5);

	/* locator */
	renderer = gtk_cell_renderer_text_new ();
	column = gtk_tree_view_column_new_with_attributes (_("QRA"), renderer,
													   "text", QTH_LIST_COL_QRA,
													   NULL);
	gtk_tree_view_insert_column (GTK_TREE_VIEW (qthlist), column, -1);
	gtk_tree_view_column_set_alignment (column, 0.5);

	/* weather station */
	/* 	renderer = gtk_cell_renderer_text_new (); */
	/* 	column = gtk_tree_view_column_new_with_attributes (_("WX"), renderer, */
	/* 							   "text", QTH_LIST_COL_WX, */
	/* 							   NULL); */
	/* 	gtk_tree_view_insert_column (GTK_TREE_VIEW (qthlist), column, -1); */
	/* 	gtk_tree_view_column_set_alignment (column, 0.5); */

	/* default */
	renderer = gtk_cell_renderer_toggle_new ();
	handler_id = g_signal_connect (renderer, "toggled",
								   G_CALLBACK (default_toggled), model);

	column = gtk_tree_view_column_new_with_attributes (_("Default"), renderer,
													   "active", QTH_LIST_COL_DEF,
													   NULL);
	gtk_tree_view_append_column (GTK_TREE_VIEW (qthlist), column);
	gtk_tree_view_column_set_alignment (column, 0.5);


	return qthlist;
}


/** \brief Create data storage for QTH list.
 *
 * This function creates the data storage necessary for the
 * list view. The newly created tree model is populated with
 * data from the .qth files in the users config diretory.
 * The individual .qth files are read by the read_qth_file
 * function.
 */
static GtkTreeModel *
create_and_fill_model ()
{
	GtkListStore *liststore;    /* the list store data structure */
	GDir         *dir = NULL;   /* directory handle */
	GError       *error = NULL; /* error flag and info */
	gchar        *dirname;      /* directory name */
	const gchar  *filename;     /* file name */
	gchar        *buff;

	/* create a new list store */
	liststore = gtk_list_store_new (QTH_LIST_COL_NUM,
									G_TYPE_STRING,    // QTH name
									G_TYPE_STRING,    // Location
									G_TYPE_STRING,    // Description
									G_TYPE_DOUBLE,    // Latitude
									G_TYPE_DOUBLE,    // Longitude
									G_TYPE_INT,       // Altitude
									G_TYPE_STRING,    // QRA locator
									G_TYPE_STRING,    // Weather station
									G_TYPE_BOOLEAN    // Default
									);

	/* scan for .qth files in the user config directory and
	   add the contents of each .qth file to the list store
	*/
    dirname = get_user_conf_dir ();
	dir = g_dir_open (dirname, 0, &error);


	if (dir) {

		while ((filename = g_dir_read_name (dir))) {

			if (g_strrstr (filename, ".qth")) {

				buff = g_strconcat (dirname, G_DIR_SEPARATOR_S,
									filename, NULL);

				/* read qth file */
				if (read_qth_file (liststore, buff)) {
					/* send debug message */
					sat_log_log (SAT_LOG_LEVEL_DEBUG,
								 _("%s:%d: Read QTH data from %s."),
								 __FILE__, __LINE__, filename);
				}
				else {
					/* error reading the file */
					sat_log_log (SAT_LOG_LEVEL_ERROR,
								 _("%s:%d: Error reading %s (see prev msg)"),
								 __FILE__, __LINE__, filename);
				}

				g_free (buff);
			}
		}
	}
	else {
		sat_log_log (SAT_LOG_LEVEL_ERROR,
					 _("%s:%d: Failed to open user cfg dir (%s)"),
					 __FILE__, __LINE__, error->message);
		g_clear_error (&error);
	}

	g_free (dirname);
	g_dir_close (dir);

	return GTK_TREE_MODEL (liststore);
}


/** \brief Read QTH file and add data to list store.
 *  \param liststore The GtkListStore where the data should be stored.
 *  \param filename The full name of the qth file.
 *  \return 1 if read is successful, 0 if an error occurs.
 *
 * The function uses the gtk-sat-data infrastructure to read the qth
 * data from the specified file.
 *
 * There is a little challenge here. First, we want to read the data from
 * the .qth files and store them in the list store. To do this we use a
 * qth_t structure, which can be populated using gtk_sat_data_read_qth.
 * Then, when the configuration is finished and the user presses "OK", we
 * want to write all the data back to the .qth files. To do that, we create
 * an up-to-date qth_t data structure and pass it to the gtk_sat_data_write_qth
 * function, which will take care of updating the GKeyFile data structure and
 * writing the contents to the .qth file.
 */
static guint
read_qth_file (GtkListStore *liststore, gchar *filename)
{
	GtkTreeIter  item;		/* new item added to the list store */
	qth_t       *qth;		/* qth data structure */
	gchar       *defqth;
	gboolean     is_default = FALSE;
	gchar       *fname;
	gint         dispalt;	/* displayed altitude */

	if ((qth = g_try_new0 (qth_t, 1)) == NULL) {
		sat_log_log (SAT_LOG_LEVEL_ERROR,
					 _("%s:%d: Failed to allocate memory!\n"),
					 __FILE__, __LINE__);

		return FALSE;
	}

	/* read data from file */
    if (!qth_data_read (filename, qth)) {
		g_free (qth);
		return FALSE;
	}

	/* calculate QRA locator */
	gint  retcode;

	qth->qra = g_malloc (7);
	retcode = longlat2locator (qth->lon, qth->lat, qth->qra, 3);

	if (retcode != RIG_OK) {
		sat_log_log (SAT_LOG_LEVEL_ERROR,
					 _("%s:%d: Could not convert (%.2f,%.2f) to QRA."),
					 __FILE__, __LINE__,
					 qth->lat, qth->lon);
		qth->qra[0] = '\0';
	}
	else {
		qth->qra[6] = '\0';
		sat_log_log (SAT_LOG_LEVEL_DEBUG,
					 _("%s:%d: QRA locator is %s"),
					 __FILE__, __LINE__, qth->qra);
	}

	/* is this the default qth? */
	defqth = sat_cfg_get_str (SAT_CFG_STR_DEF_QTH);

	if (g_str_has_suffix (filename, defqth)) {
		is_default = TRUE;

		sat_log_log (SAT_LOG_LEVEL_MSG,
					 _("%s:%d: This appears to be the default QTH."),
					 __FILE__, __LINE__);
	}

	g_free (defqth);

	/* check wehter we are using imperial or metric system;
	   in case of imperial we have to convert altitude from
	   meters to feet.
	   note: the internat data are always kept in metric and
	   only the displayed numbers are converted. Therefore,
	   we use a dedicated var 'dispalt'
	*/
	/* NO, ONLY DISPLAY WIDGETS WILL BE AFFECTED BY THIS SETTING */
	if (sat_cfg_get_bool (SAT_CFG_BOOL_USE_IMPERIAL)) {
		dispalt = (gint) M_TO_FT(qth->alt);
	}
	else {
		dispalt = (gint) qth->alt;
	}

	/* strip file name; we don't need the whole path */
	fname = g_path_get_basename (filename);

	/* we now have all necessary data in the qth_t structure;
	   add the data to the list store */
	gtk_list_store_append (liststore, &item);
	gtk_list_store_set (liststore, &item,
						QTH_LIST_COL_NAME, qth->name,
						QTH_LIST_COL_LOC, qth->loc,
						QTH_LIST_COL_DESC, qth->desc,
						QTH_LIST_COL_LAT, qth->lat,
						QTH_LIST_COL_LON, qth->lon,
						QTH_LIST_COL_ALT, dispalt,
						QTH_LIST_COL_QRA, qth->qra,
						QTH_LIST_COL_WX, qth->wx,
						QTH_LIST_COL_DEF, is_default,
						-1);

	g_free (fname);

	/* we are finished with this qth, free it */
    qth_data_free (qth);

	return TRUE;
}


/** \brief Create buttons.
 *  \param qthlist The GtkTreeView widget containing the qth data.
 *  \return A button box containing the buttons.
 *
 * This function creates and initialises the three buttons below the qth list.
 * The treeview widget is needed by the buttons when they are activated.
 *
 */
static GtkWidget *
create_buttons (GtkTreeView *qthlist)
{
	GtkWidget *box;

	/* add button */
	addbutton = gpredict_hstock_button (GTK_STOCK_ADD,
										_("Add New"),
										_("Add a new ground station to the list"));
	g_signal_connect (addbutton, "clicked", G_CALLBACK (add_cb), qthlist);

	/* edit button */
	editbutton = gpredict_hstock_button (GTK_STOCK_EDIT,
										 _("Edit"),
										 _("Edit the currently selected ground station"));
	g_signal_connect (editbutton, "clicked", G_CALLBACK (edit_cb), qthlist);

	/* delete button; don't forget to delete file.... */
	delbutton = gpredict_hstock_button (GTK_STOCK_DELETE,
										_("Delete"),
										_("Delete the selected ground station"));
	g_signal_connect (delbutton, "clicked", G_CALLBACK (delete_cb), qthlist);

	/* vertical button box */
	box = gtk_hbutton_box_new ();
	gtk_button_box_set_layout (GTK_BUTTON_BOX (box), GTK_BUTTONBOX_START);

	gtk_container_add (GTK_CONTAINER (box), addbutton);
	gtk_container_add (GTK_CONTAINER (box), editbutton);
	gtk_container_add (GTK_CONTAINER (box), delbutton);


	return box;
}


static void
add_cb    (GtkWidget *button, gpointer data)
{
	GtkTreeView *qthlist = GTK_TREE_VIEW (data);

	sat_pref_qth_editor_run (qthlist, TRUE);
}


static void
edit_cb   (GtkWidget *button, gpointer data)
{
	GtkTreeView *qthlist = GTK_TREE_VIEW (data);

	sat_pref_qth_editor_run (qthlist, FALSE);
}


/** \brief Delete selected location
 *
 * This function is called when the user clicks the DELETE button.
 * If there are more than one locations defined in the list, the function
 * will delete the selected one. If the deleted location used to be the default
 * location, the first entry in the list will be selected as new default location.
 *
 * \note This function only deletes from the QTH list, not from disk. If the user
 *       eventually presses OK, all QTH files will be removed before the new data
 *       is rewritten to disk, thus the deleted entry will not be saved again. On
 *       the other hand, if user clicks cancel, the delete process will be undone.
 */
static void
delete_cb (GtkWidget *button, gpointer data)
{
	GtkTreeView      *qthlist = GTK_TREE_VIEW (data);
	GtkTreeModel     *model = gtk_tree_view_get_model (qthlist);
	GtkTreeModel     *selmod;
	GtkTreeSelection *selection;
	GtkTreeIter       iter;


	/* if this is the only entry, tell user that it is not
	   possible to delete
	*/
	if (gtk_tree_model_iter_n_children (model, NULL) < 2) {

		GtkWidget *dialog;

		dialog = gtk_message_dialog_new (GTK_WINDOW (window),
										 GTK_DIALOG_MODAL |
										 GTK_DIALOG_DESTROY_WITH_PARENT,
										 GTK_MESSAGE_ERROR,
										 GTK_BUTTONS_OK,
										 _("Can not delete ground station!\n\n"\
										   "You need to have at least one ground\n"\
										   "station set up, otherwise gpredict may\n"\
										   "not work properly."));

		gtk_dialog_run (GTK_DIALOG (dialog));
		gtk_widget_destroy (dialog);
	}
	else {
		/* get selected row
		   FIXME: do we really need to work with two models?
		*/
		selection = gtk_tree_view_get_selection (qthlist);
		if (gtk_tree_selection_get_selected(selection, &selmod, &iter)) {

			gboolean  neednewdef = FALSE;
			gchar    *buff;

			gtk_tree_model_get (selmod, &iter,
								QTH_LIST_COL_DEF, &neednewdef,
								QTH_LIST_COL_NAME, &buff,
								-1);

			g_free (buff);

			/* delete qth entry from list */
			gtk_list_store_remove (GTK_LIST_STORE(selmod), &iter);


			/* if the selected qth entry is the default one
			   select the first entry in the list as the
			   new default qth.
			*/
			if (neednewdef) {

				if (gtk_tree_model_get_iter_first (model, &iter)) {
					gtk_list_store_set (GTK_LIST_STORE (model),
										&iter,
										QTH_LIST_COL_DEF, TRUE,
										-1);
				}
				else {
					/* huh? no more entries, this is a bug! */
					sat_log_log (SAT_LOG_LEVEL_BUG,
								 _("%s:%d: Empty ground station list!"),
								 __FILE__, __LINE__);
				}

			}
		}
	}
}



/** \brief Handle toggle events on "Default" check box
 *  \param cell The item that received the signal.
 *  \param path_str Path string.
 *  \param data Pointer to user data (list store).
 *
 * This function is called when the user clicks on "Default" check box
 * indicating that a new default location has been selected. If the
 * clicked check box has been un-checked the action is ignored, because
 * we need a default location. If the clicked check box has been checked,
 * the default flag of the checked QTH is set to TRUE, while the flag is
 * cleared for all the other QTH's.
 */
static void
default_toggled (GtkCellRendererToggle *cell,
				 gchar                 *path_str,
				 gpointer               data)
{
	GtkTreeModel *model = (GtkTreeModel *)data;
	GtkTreeIter   iter;
	GtkTreePath  *path = gtk_tree_path_new_from_string (path_str);
	gboolean      fixed;
	gchar        *defqth;


	/* block toggle signals while we mess with the check boxes */
	g_signal_handler_block (cell, handler_id);

	/* get toggled iter */
	gtk_tree_model_get_iter (model, &iter, path);
	gtk_tree_model_get (model, &iter, QTH_LIST_COL_DEF, &fixed, -1);

	if (fixed) {
		/* do nothing except sending a message */
		sat_log_log (SAT_LOG_LEVEL_MSG,
					 _("%s:%d: Default QTH can not be cleared! "\
					   "Select another QTH to change default."),
					 __FILE__, __LINE__);
	}
	else {
		/* make this qth new default */
		gtk_list_store_set (GTK_LIST_STORE (model), &iter,
							QTH_LIST_COL_DEF, TRUE,
							-1);

		/* copy file name of new default QTH to a string buffer */
		gtk_tree_model_get (model, &iter,
							QTH_LIST_COL_NAME, &defqth,
							-1);

		sat_log_log (SAT_LOG_LEVEL_MSG,
					 _("%s:%d: New default QTH is %s.qth."),
					 __FILE__, __LINE__, defqth);

		/* clear the default flag for the other qth */
		gtk_tree_model_foreach  (model, clear_default_flags, defqth);

		g_free (defqth);

	}

	/* clean up */
	gtk_tree_path_free (path);

	/* unblock toggle signals */
	g_signal_handler_unblock (cell, handler_id);
}


/** \brief Clear default flag for all qth, except defqth.
 *  \param model The GtkTreeModel.
 *  \param path  The GtkTreePath.
 *  \param iter  The GtkTreeIter of the current item.
 *  \param defqth The file name of the new default which should not be cleared.
 *
 * This function is called for each QTH entry in the QTH list with the purpose of
 * clearing the default flag. This happens when the user selects a new QTH to be
 * the default QTH and the other ones need to be cleared.
 */
static gboolean
clear_default_flags (GtkTreeModel *model, GtkTreePath *path, GtkTreeIter *iter, gpointer defqth)
{
	gchar *thisqth;


	gtk_tree_model_get (model, iter,
						QTH_LIST_COL_NAME, &thisqth,
						-1);

	/* clear flag if this is not the new default QTH */
	if (g_ascii_strcasecmp (thisqth, (gchar *) defqth)) {

		gtk_list_store_set (GTK_LIST_STORE (model), iter,
							QTH_LIST_COL_DEF, FALSE,
							-1);

		sat_log_log (SAT_LOG_LEVEL_DEBUG,
					 _("%s:%d: Clearing default flag for %s."),
					 __FILE__, __LINE__, thisqth);

	}
				
	g_free (thisqth);

	return FALSE;
}


/* render column containg float
   by using this instead of the default data function, we can
   control the number of decimals and display the coordinates in a
   fancy way, including degree sign and NWSE suffixes.

   Please note that this function only affects how the numbers are
   displayed (rendered), the tree_store will still contain the
   original flaoting point numbers. Very cool!
*/
static void
float_cell_data_function (GtkTreeViewColumn *col,
						  GtkCellRenderer   *renderer,
						  GtkTreeModel      *model,
						  GtkTreeIter       *iter,
						  gpointer           column)
{
	gdouble   number;
	gchar   *buff;
	guint    coli = GPOINTER_TO_UINT (column);
	gchar    hmf = ' ';

	gtk_tree_model_get (model, iter, coli, &number, -1);

	/* check whether configuration requests the use
	   of N, S, E and W instead of signs
	*/
	if (sat_cfg_get_bool (SAT_CFG_BOOL_USE_NSEW)) {

		if (coli == QTH_LIST_COL_LAT) {
			if (number < 0.0) {
				number *= -1.0;
				hmf = 'S';
			}
			else {
				hmf = 'N';
			}
		}
		else if (coli == QTH_LIST_COL_LON) {
			if (number < 0.0) {
				number *= -1.0;
				hmf = 'W';
			}
			else {
				hmf = 'E';
			}
		}
		else {
			sat_log_log (SAT_LOG_LEVEL_BUG,
						 _("%s:%d: Invalid column: %d"),
						 __FILE__, __LINE__,
						 coli);
			hmf = '?';
		}
	}

	/* format the number */
	buff = g_strdup_printf ("%.4f\302\260%c", number, hmf);
	g_object_set (renderer, "text", buff, NULL);
	g_free (buff);
}


/* function below not used */
#if 0
/** \brief Callback function to check each QTH for beeing the default */
static gboolean
check_and_set_default_qth (GtkTreeModel *model,
						   GtkTreePath  *path,
						   GtkTreeIter  *iter,
						   gpointer      data)
{
	gboolean  def     = FALSE;
	gchar    *buff;
	gchar    *filename;

	gtk_tree_model_get (model, iter,
						QTH_LIST_COL_DEF, &def,
						QTH_LIST_COL_NAME, &buff,
						-1);

	if (def) {
		/* this is a new default qth;
		   get file name component of path and save it as default
		*/
		filename = g_strconcat (buff, ".qth", NULL);
		sat_cfg_set_str (SAT_CFG_STR_DEF_QTH, filename);
		g_free (filename);
		g_free (buff);
		

		return TRUE;
	}
	g_free (buff);

	return FALSE;
}
#endif

/** \brief save a row from the QTH list (called by the save function) */
static gboolean
save_qth (GtkTreeModel *model,
		  GtkTreePath  *path,
		  GtkTreeIter  *iter,
		  gpointer      data)
{
	qth_t     qth;
    gboolean  def = FALSE;
    gchar    *filename,*confdir;
	gchar    *buff;


	gtk_tree_model_get (model, iter,
						QTH_LIST_COL_DEF, &def,
						QTH_LIST_COL_NAME, &qth.name,
						QTH_LIST_COL_LOC,  &qth.loc,
						QTH_LIST_COL_DESC, &qth.desc,
						QTH_LIST_COL_LAT, &qth.lat,
						QTH_LIST_COL_LON, &qth.lon,
						QTH_LIST_COL_ALT, &qth.alt,
						QTH_LIST_COL_WX, &qth.wx,
						-1);

    confdir = get_user_conf_dir ();
    filename = g_strconcat (confdir, G_DIR_SEPARATOR_S,	qth.name, ".qth", NULL);
    g_free (confdir);
	
	/* check wehter we are using imperial or metric system;
	   in case of imperial we have to convert altitude from
	   feet to meters before saving.
	*/
	if (sat_cfg_get_bool (SAT_CFG_BOOL_USE_IMPERIAL)) {
		qth.alt = (guint) FT_TO_M(qth.alt);
	}	
	
    if (qth_data_save (filename, &qth)) {
		
		/* saved ok, go on check whether qth is default */
		if (def) {
			sat_log_log (SAT_LOG_LEVEL_MSG,
						 _("%s:%d: %s appears to be default QTH"),
						 __FILE__, __LINE__, qth.name);
			
			buff = g_path_get_basename (filename);
			sat_cfg_set_str (SAT_CFG_STR_DEF_QTH, buff);
			g_free (buff);
			
		}
		
	}
	
	g_free (filename);
	g_free (qth.name);
	g_free (qth.loc);
	g_free (qth.desc);
	g_free (qth.wx);

	return FALSE;
}


/** \brief Remove .qth files.
 *
 * This function is used to remove any existing .qth file
 * before storing the data from the QTH list.
 */
static void
delete_location_files ()
{
	GDir         *dir = NULL;   /* directory handle */
	GError       *error = NULL; /* error flag and info */
	gchar        *dirname;      /* directory name */
	const gchar  *filename;     /* file name */
	gchar        *buff;


	/* scan for .qth files in the user config directory and
	   add the contents of each .qth file to the list store
	*/
    dirname = get_user_conf_dir ();
	dir = g_dir_open (dirname, 0, &error);


	if (dir) {

		while ((filename = g_dir_read_name (dir))) {

			if (g_strrstr (filename, ".qth")) {

				buff = g_strconcat (dirname, G_DIR_SEPARATOR_S,
									filename, NULL);

				/* remove file */
				if (g_remove (buff)) {
					sat_log_log (SAT_LOG_LEVEL_ERROR,
								 _("%s:%d: Failed top remove %s"),
								 __FILE__, __LINE__, filename);
				}
				else {
					sat_log_log (SAT_LOG_LEVEL_DEBUG,
								 _("%s:%d: Removed %s"),
								 __FILE__, __LINE__, filename);
				}

				g_free (buff);
			}
		}
	}
	else {
		sat_log_log (SAT_LOG_LEVEL_ERROR,
					 _("%s:%d: Failed to open user cfg dir (%s)"),
					 __FILE__, __LINE__, error->message);
		g_clear_error (&error);

	}

	g_free (dirname);
	g_dir_close (dir);
}



/** \brief Manage measurement system changes.
 *
 * This function should be called when the user changes between the
 * metric and imperial systems. When that happens, we need to convert
 * location altitudeas right away, otherwise the altitudes in the qth
 * list will keep their old values in the new system.
 *
 * If imperial = TRUE the new system is imperial and so we have to use
 * M_TO_FT.
 */
void
sat_pref_qth_sys_changed (gboolean imperial)
{

	gtk_tree_model_foreach (gtk_tree_view_get_model(GTK_TREE_VIEW(qthlist)),
							convert_qth_altitude,
							GUINT_TO_POINTER(imperial));
}


/** \brief Convert altitude of the specified QTH entry.
 *
 * The data contain pointer to a boolean indicating whether the new
 * system is imperial (TRUE) or metric (FALSE)
 */
static gboolean
convert_qth_altitude (GtkTreeModel *model,
					  GtkTreePath  *path,
					  GtkTreeIter  *iter,
					  gpointer      data)
{
	gint alti;
	GtkTreeViewColumn *column;
	gchar  *title;


	/* first, get the current altitude and other data */
	gtk_tree_model_get (model, iter,
						QTH_LIST_COL_ALT, &alti,
						-1);
	column = gtk_tree_view_get_column (GTK_TREE_VIEW (qthlist), 3);

	if (GPOINTER_TO_UINT(data)) {
		/* new sys is imperial */
		alti = M_TO_FT(alti);
		title = g_strdup (_("Alt (ft)"));
	}
	else {
		/* new sys is metric */
		alti = FT_TO_M(alti);
		title = g_strdup (_("Alt (m)"));
	}

	/* store new value */
	gtk_list_store_set (GTK_LIST_STORE (model), iter,
						QTH_LIST_COL_ALT, alti,
						-1);
	/* update column title */
	gtk_tree_view_column_set_title (column, title);
	g_free (title);

	return FALSE;
}