src/vikgoto.c

/*
 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
 *
 * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
 * Copyright (C) 2009, Guilhem Bonnefille <guilhem.bonnefille@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include <glib/gstdio.h>
#include <glib/gprintf.h>
#include <glib/gi18n.h>

#include "viking.h"
#include "util.h"
#include "vikgototool.h"
#include "vikgoto.h"

/* Compatibility */
#if ! GLIB_CHECK_VERSION(2,22,0)
#define g_mapped_file_unref g_mapped_file_free
#endif

static gchar *last_goto_str = NULL;
static VikCoord *last_coord = NULL;
static gchar *last_successful_goto_str = NULL;

static GList *goto_tools_list = NULL;

#define VIK_SETTINGS_GOTO_PROVIDER "goto_provider"
int last_goto_tool = -1;

void vik_goto_register ( VikGotoTool *tool )
{
  if ( IS_VIK_GOTO_TOOL( tool ) )
    goto_tools_list = g_list_append ( goto_tools_list, g_object_ref ( tool ) );
}

void vik_goto_unregister_all ()
{
  g_list_foreach ( goto_tools_list, (GFunc) g_object_unref, NULL );
}

gchar * a_vik_goto_get_search_string_for_this_place(VikWindow *vw)
{
  if (!last_coord)
    return NULL;

  VikViewport *vvp = vik_window_viewport(vw);
  const VikCoord *cur_center = vik_viewport_get_center(vvp);
  if (vik_coord_equals(cur_center, last_coord)) {
    return(last_successful_goto_str);
  }
  else
    return NULL;
}

static void display_no_tool(VikWindow *vw)
{
  GtkWidget *dialog = NULL;

  dialog = gtk_message_dialog_new ( GTK_WINDOW(vw), GTK_DIALOG_MODAL, GTK_MESSAGE_WARNING, GTK_BUTTONS_OK, _("No goto tool available.") );

  gtk_dialog_run ( GTK_DIALOG(dialog) );

  gtk_widget_destroy(dialog);
}

static gboolean prompt_try_again(VikWindow *vw)
{
  GtkWidget *dialog = NULL;
  gboolean ret = TRUE;

  dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
  gtk_window_set_title(GTK_WINDOW(dialog), _("goto"));

  GtkWidget *goto_label = gtk_label_new(_("I don't know that place. Do you want another goto?"));
  gtk_box_pack_start ( GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(dialog))), goto_label, FALSE, FALSE, 5 );
  gtk_dialog_set_default_response ( GTK_DIALOG(dialog), GTK_RESPONSE_ACCEPT );
  gtk_widget_show_all(dialog);

  if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT )
    ret = FALSE;

  gtk_widget_destroy(dialog);
  return ret;
}

static gint find_entry = -1;
static gint wanted_entry = -1;

static void find_provider (gpointer elem, gpointer user_data)
{
  const gchar *name = vik_goto_tool_get_label (elem);
  const gchar *provider = user_data;
  find_entry++;
  if (!strcmp(name, provider)) {
    wanted_entry = find_entry;
  }
}

/**
 * Setup last_goto_tool value
 */
static void get_provider ()
{
  // Use setting for the provider if available
  if ( last_goto_tool < 0 ) {
    find_entry = -1;
    wanted_entry = -1;
    gchar *provider = NULL;
    if ( a_settings_get_string ( VIK_SETTINGS_GOTO_PROVIDER, &provider ) ) {
      // Use setting
      if ( provider )
        g_list_foreach (goto_tools_list, find_provider, provider);
      // If not found set it to the first entry, otherwise use the entry
      last_goto_tool = ( wanted_entry < 0 ) ? 0 : wanted_entry;
    }
    else
      last_goto_tool = 0;
  }
}

static gchar *a_prompt_for_goto_string(VikWindow *vw)
{
  GtkWidget *dialog = NULL;

  dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
  gtk_window_set_title(GTK_WINDOW(dialog), _("goto"));

  GtkWidget *tool_label = gtk_label_new(_("goto provider:"));
  GtkWidget *tool_list = vik_combo_box_text_new ();
  GList *current = g_list_first (goto_tools_list);
  while (current != NULL)
  {
    char *label = NULL;
    VikGotoTool *tool = current->data;
    label = vik_goto_tool_get_label (tool);
    vik_combo_box_text_append ( tool_list, label );
    current = g_list_next (current);
  }

  get_provider ();
  gtk_combo_box_set_active ( GTK_COMBO_BOX( tool_list ), last_goto_tool );

  GtkWidget *goto_label = gtk_label_new(_("Enter address or place name:"));
  GtkWidget *goto_entry = gtk_entry_new();
  if (last_goto_str)
    gtk_entry_set_text(GTK_ENTRY(goto_entry), last_goto_str);

  // 'ok' when press return in the entry
  g_signal_connect_swapped (goto_entry, "activate", G_CALLBACK(a_dialog_response_accept), dialog);

  gtk_box_pack_start ( GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(dialog))), tool_label, FALSE, FALSE, 5 );
  gtk_box_pack_start ( GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(dialog))), tool_list, FALSE, FALSE, 5 );
  gtk_box_pack_start ( GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(dialog))), goto_label, FALSE, FALSE, 5 );
  gtk_box_pack_start ( GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(dialog))), goto_entry, FALSE, FALSE, 5 );
  gtk_dialog_set_default_response ( GTK_DIALOG(dialog), GTK_RESPONSE_ACCEPT );
  gtk_widget_show_all(dialog);

  // Ensure the text field has focus so we can start typing straight away
  gtk_widget_grab_focus ( goto_entry );

  if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT ) {
    gtk_widget_destroy(dialog);
    return NULL;
  }

  // TODO check if list is empty
  last_goto_tool = gtk_combo_box_get_active ( GTK_COMBO_BOX(tool_list) );
  gchar *provider = vik_goto_tool_get_label ( g_list_nth_data (goto_tools_list, last_goto_tool) );
  a_settings_set_string ( VIK_SETTINGS_GOTO_PROVIDER, provider );

  gchar *goto_str = g_strdup ( gtk_entry_get_text ( GTK_ENTRY(goto_entry) ) );

  gtk_widget_destroy(dialog);

  if (goto_str[0] != '\0') {
    if (last_goto_str)
      g_free(last_goto_str);
    last_goto_str = g_strdup(goto_str);
  }

  return(goto_str);   /* goto_str needs to be freed by caller */
}

/**
 * Goto a place when we already have a string to search on
 *
 * Returns: %TRUE if a successful lookup
 */
static gboolean vik_goto_place ( VikWindow *vw, VikViewport *vvp, gchar* name, VikCoord *vcoord )
{
  // Ensure last_goto_tool is given a value
  get_provider ();

  if ( goto_tools_list ) {
    VikGotoTool *gototool = g_list_nth_data ( goto_tools_list, last_goto_tool );
    if ( gototool ) {
      if ( vik_goto_tool_get_coord ( gototool, vw, vvp, name, vcoord ) == 0 )
        return TRUE;
    }
  }
  return FALSE;
}

void a_vik_goto(VikWindow *vw, VikViewport *vvp)
{
  VikCoord new_center;
  gchar *s_str;
  gboolean more = TRUE;

  if (goto_tools_list == NULL)
  {
    /* Empty list */
    display_no_tool(vw);
    return;
  }

  do {
    s_str = a_prompt_for_goto_string(vw);
    if ((!s_str) || (s_str[0] == 0)) {
      more = FALSE;
    }

    else if (!vik_goto_tool_get_coord(g_list_nth_data (goto_tools_list, last_goto_tool), vw, vvp, s_str, &new_center)) {
      if (last_coord)
        g_free(last_coord);
      last_coord = g_malloc(sizeof(VikCoord));
      *last_coord = new_center;
      if (last_successful_goto_str)
        g_free(last_successful_goto_str);
      last_successful_goto_str = g_strdup(last_goto_str);
      vik_viewport_set_center_coord(vvp, &new_center);
      more = FALSE;
    }
    else if (!prompt_try_again(vw))
        more = FALSE;
    g_free(s_str);
  } while (more);
}

#define HOSTIP_LATITUDE_PATTERN "\"lat\":\""
#define HOSTIP_LONGITUDE_PATTERN "\"lng\":\""
#define HOSTIP_CITY_PATTERN "\"city\":\""
#define HOSTIP_COUNTRY_PATTERN "\"country_name\":\""

/**
 * Automatic attempt to find out where you are using:
 *   1. http://www.hostip.info ++
 *   2. if not specific enough fallback to using the default goto tool with a country name
 * ++ Using returned JSON information
 *  c.f. with googlesearch.c - similar implementation is used here
 *
 * returns:
 *   0 if failed to locate anything
 *   1 if exact latitude/longitude found
 *   2 if position only as precise as a city
 *   3 if position only as precise as a country
 * @name: Contains the name of place found. Free this string after use.
 */
gint a_vik_goto_where_am_i ( VikViewport *vvp, struct LatLon *ll, gchar **name )
{
  gint result = 0;
  *name = NULL;

  gchar *tmpname = a_download_uri_to_tmp_file ( "http://api.hostip.info/get_json.php?position=true", NULL );
  //gchar *tmpname = g_strdup ("../test/hostip2.json");
  if (!tmpname) {
    return result;
  }

  ll->lat = 0.0;
  ll->lon = 0.0;

  gchar *pat;
  GMappedFile *mf;
  gchar *ss;
  gint fragment_len;

  gchar lat_buf[32], lon_buf[32];
  lat_buf[0] = lon_buf[0] = '\0';
  gchar *country = NULL;
  gchar *city = NULL;

  if ((mf = g_mapped_file_new(tmpname, FALSE, NULL)) == NULL) {
    g_critical(_("couldn't map temp file"));
    goto tidy;
  }

  gsize len = g_mapped_file_get_length(mf);
  gchar *text = g_mapped_file_get_contents(mf);

  if ((pat = g_strstr_len(text, len, HOSTIP_COUNTRY_PATTERN))) {
    pat += strlen(HOSTIP_COUNTRY_PATTERN);
    fragment_len = 0;
    ss = pat;
    while (*pat != '"') {
      fragment_len++;
      pat++;
    }
    country = g_strndup(ss, fragment_len);
  }

  if ((pat = g_strstr_len(text, len, HOSTIP_CITY_PATTERN))) {
    pat += strlen(HOSTIP_CITY_PATTERN);
    fragment_len = 0;
    ss = pat;
    while (*pat != '"') {
      fragment_len++;
      pat++;
    }
    city = g_strndup(ss, fragment_len);
  }

  if ((pat = g_strstr_len(text, len, HOSTIP_LATITUDE_PATTERN))) {
    pat += strlen(HOSTIP_LATITUDE_PATTERN);
    ss = lat_buf;
    if (*pat == '-')
      *ss++ = *pat++;
    while ((ss < (lat_buf + sizeof(lat_buf))) && (pat < (text + len)) &&
	   (g_ascii_isdigit(*pat) || (*pat == '.')))
      *ss++ = *pat++;
    *ss = '\0';
    ll->lat = g_ascii_strtod(lat_buf, NULL);
  }

  if ((pat = g_strstr_len(text, len, HOSTIP_LONGITUDE_PATTERN))) {
    pat += strlen(HOSTIP_LONGITUDE_PATTERN);
    ss = lon_buf;
    if (*pat == '-')
      *ss++ = *pat++;
    while ((ss < (lon_buf + sizeof(lon_buf))) && (pat < (text + len)) &&
	   (g_ascii_isdigit(*pat) || (*pat == '.')))
      *ss++ = *pat++;
    *ss = '\0';
    ll->lon = g_ascii_strtod(lon_buf, NULL);
  }

  if ( ll->lat != 0.0 && ll->lon != 0.0 ) {
    if ( ll->lat > -90.0 && ll->lat < 90.0 && ll->lon > -180.0 && ll->lon < 180.0 ) {
      // Found a 'sensible' & 'precise' location
      result = 1;
      *name = g_strdup ( _("Locality") ); //Albeit maybe not known by an actual name!
    }
  }
  else {
    // Hopefully city name is unique enough to lookup position on
    // Maybe for American places where hostip appends the State code on the end
    // But if the country code is not appended if could easily get confused
    //  e.g. 'Portsmouth' could be at least
    //   Portsmouth, Hampshire, UK or
    //   Portsmouth, Viginia, USA.

    // Try city name lookup
    if ( city ) {
      g_debug ( "%s: found city %s", __FUNCTION__, city );
      if ( strcmp ( city, "(Unknown city)" ) != 0 ) {
        VikCoord new_center;
        if ( vik_goto_place ( NULL, vvp, city, &new_center ) ) {
          // Got something
          vik_coord_to_latlon ( &new_center, ll );
          result = 2;
          *name = city;
          goto tidy;
        }
      }
    }

    // Try country name lookup
    if ( country ) {
      g_debug ( "%s: found country %s", __FUNCTION__, country );
      if ( strcmp ( country, "(Unknown Country)" ) != 0 ) {
        VikCoord new_center;
        if ( vik_goto_place ( NULL, vvp, country, &new_center ) ) {
          // Finally got something
          vik_coord_to_latlon ( &new_center, ll );
          result = 3;
          *name = country;
          goto tidy;
        }
      }
    }
  }

 tidy:
  g_mapped_file_unref ( mf );
  g_remove ( tmpname );
  g_free ( tmpname );
  return result;
}
Commit	Line	Data
	1	/*
	2	* viking -- GPS Data and Topo Analyzer, Explorer, and Manager
	3	*
	4	* Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
	5	* Copyright (C) 2009, Guilhem Bonnefille <guilhem.bonnefille@gmail.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	*/
	22	#ifdef HAVE_CONFIG_H
	23	#include "config.h"
	24	#endif
	25	#include <stdlib.h>
	26	#include <stdio.h>
	27	#include <string.h>
	28	#include <glib.h>
	29	#include <glib/gstdio.h>
	30	#include <glib/gprintf.h>
	31	#include <glib/gi18n.h>
	32
	33	#include "viking.h"
	34	#include "util.h"
	35	#include "vikgototool.h"
	36	#include "vikgoto.h"
	37
	38	/* Compatibility */
	39	#if ! GLIB_CHECK_VERSION(2,22,0)
	40	#define g_mapped_file_unref g_mapped_file_free
	41	#endif
	42
	43	static gchar *last_goto_str = NULL;
	44	static VikCoord *last_coord = NULL;
	45	static gchar *last_successful_goto_str = NULL;
	46
	47	static GList *goto_tools_list = NULL;
	48
	49	#define VIK_SETTINGS_GOTO_PROVIDER "goto_provider"
	50	int last_goto_tool = -1;
	51
	52	void vik_goto_register ( VikGotoTool *tool )
	53	{
	54	if ( IS_VIK_GOTO_TOOL( tool ) )
	55	goto_tools_list = g_list_append ( goto_tools_list, g_object_ref ( tool ) );
	56	}
	57
	58	void vik_goto_unregister_all ()
	59	{
	60	g_list_foreach ( goto_tools_list, (GFunc) g_object_unref, NULL );
	61	}
	62
	63	gchar * a_vik_goto_get_search_string_for_this_place(VikWindow *vw)
	64	{
	65	if (!last_coord)
	66	return NULL;
	67
	68	VikViewport *vvp = vik_window_viewport(vw);
	69	const VikCoord *cur_center = vik_viewport_get_center(vvp);
	70	if (vik_coord_equals(cur_center, last_coord)) {
	71	return(last_successful_goto_str);
	72	}
	73	else
	74	return NULL;
	75	}
	76
	77	static void display_no_tool(VikWindow *vw)
	78	{
	79	GtkWidget *dialog = NULL;
	80
	81	dialog = gtk_message_dialog_new ( GTK_WINDOW(vw), GTK_DIALOG_MODAL, GTK_MESSAGE_WARNING, GTK_BUTTONS_OK, _("No goto tool available.") );
	82
	83	gtk_dialog_run ( GTK_DIALOG(dialog) );
	84
	85	gtk_widget_destroy(dialog);
	86	}
	87
	88	static gboolean prompt_try_again(VikWindow *vw)
	89	{
	90	GtkWidget *dialog = NULL;
	91	gboolean ret = TRUE;
	92
	93	dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
	94	gtk_window_set_title(GTK_WINDOW(dialog), _("goto"));
	95
	96	GtkWidget *goto_label = gtk_label_new(_("I don't know that place. Do you want another goto?"));
	97	gtk_box_pack_start ( GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(dialog))), goto_label, FALSE, FALSE, 5 );
	98	gtk_dialog_set_default_response ( GTK_DIALOG(dialog), GTK_RESPONSE_ACCEPT );
	99	gtk_widget_show_all(dialog);
	100
	101	if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT )
	102	ret = FALSE;
	103
	104	gtk_widget_destroy(dialog);
	105	return ret;
	106	}
	107
	108	static gint find_entry = -1;
	109	static gint wanted_entry = -1;
	110
	111	static void find_provider (gpointer elem, gpointer user_data)
	112	{
	113	const gchar *name = vik_goto_tool_get_label (elem);
	114	const gchar *provider = user_data;
	115	find_entry++;
	116	if (!strcmp(name, provider)) {
	117	wanted_entry = find_entry;
	118	}
	119	}
	120
	121	/**
	122	* Setup last_goto_tool value
	123	*/
	124	static void get_provider ()
	125	{
	126	// Use setting for the provider if available
	127	if ( last_goto_tool < 0 ) {
	128	find_entry = -1;
	129	wanted_entry = -1;
	130	gchar *provider = NULL;
	131	if ( a_settings_get_string ( VIK_SETTINGS_GOTO_PROVIDER, &provider ) ) {
	132	// Use setting
	133	if ( provider )
	134	g_list_foreach (goto_tools_list, find_provider, provider);
	135	// If not found set it to the first entry, otherwise use the entry
	136	last_goto_tool = ( wanted_entry < 0 ) ? 0 : wanted_entry;
	137	}
	138	else
	139	last_goto_tool = 0;
	140	}
	141	}
	142
	143	static gchar a_prompt_for_goto_string(VikWindow vw)
	144	{
	145	GtkWidget *dialog = NULL;
	146
	147	dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
	148	gtk_window_set_title(GTK_WINDOW(dialog), _("goto"));
	149
	150	GtkWidget *tool_label = gtk_label_new(_("goto provider:"));
	151	GtkWidget *tool_list = vik_combo_box_text_new ();
	152	GList *current = g_list_first (goto_tools_list);
	153	while (current != NULL)
	154	{
	155	char *label = NULL;
	156	VikGotoTool *tool = current->data;
	157	label = vik_goto_tool_get_label (tool);
	158	vik_combo_box_text_append ( tool_list, label );
	159	current = g_list_next (current);
	160	}
	161
	162	get_provider ();
	163	gtk_combo_box_set_active ( GTK_COMBO_BOX( tool_list ), last_goto_tool );
	164
	165	GtkWidget *goto_label = gtk_label_new(_("Enter address or place name:"));
	166	GtkWidget *goto_entry = gtk_entry_new();
	167	if (last_goto_str)
	168	gtk_entry_set_text(GTK_ENTRY(goto_entry), last_goto_str);
	169
	170	// 'ok' when press return in the entry
	171	g_signal_connect_swapped (goto_entry, "activate", G_CALLBACK(a_dialog_response_accept), dialog);
	172
	173	gtk_box_pack_start ( GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(dialog))), tool_label, FALSE, FALSE, 5 );
	174	gtk_box_pack_start ( GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(dialog))), tool_list, FALSE, FALSE, 5 );
	175	gtk_box_pack_start ( GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(dialog))), goto_label, FALSE, FALSE, 5 );
	176	gtk_box_pack_start ( GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(dialog))), goto_entry, FALSE, FALSE, 5 );
	177	gtk_dialog_set_default_response ( GTK_DIALOG(dialog), GTK_RESPONSE_ACCEPT );
	178	gtk_widget_show_all(dialog);
	179
	180	// Ensure the text field has focus so we can start typing straight away
	181	gtk_widget_grab_focus ( goto_entry );
	182
	183	if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT ) {
	184	gtk_widget_destroy(dialog);
	185	return NULL;
	186	}
	187
	188	// TODO check if list is empty
	189	last_goto_tool = gtk_combo_box_get_active ( GTK_COMBO_BOX(tool_list) );
	190	gchar *provider = vik_goto_tool_get_label ( g_list_nth_data (goto_tools_list, last_goto_tool) );
	191	a_settings_set_string ( VIK_SETTINGS_GOTO_PROVIDER, provider );
	192
	193	gchar *goto_str = g_strdup ( gtk_entry_get_text ( GTK_ENTRY(goto_entry) ) );
	194
	195	gtk_widget_destroy(dialog);
	196
	197	if (goto_str[0] != '\0') {
	198	if (last_goto_str)
	199	g_free(last_goto_str);
	200	last_goto_str = g_strdup(goto_str);
	201	}
	202
	203	return(goto_str); /* goto_str needs to be freed by caller */
	204	}
	205
	206	/**
	207	* Goto a place when we already have a string to search on
	208	*
	209	* Returns: %TRUE if a successful lookup
	210	*/
	211	static gboolean vik_goto_place ( VikWindow vw, VikViewport vvp, gchar* name, VikCoord *vcoord )
	212	{
	213	// Ensure last_goto_tool is given a value
	214	get_provider ();
	215
	216	if ( goto_tools_list ) {
	217	VikGotoTool *gototool = g_list_nth_data ( goto_tools_list, last_goto_tool );
	218	if ( gototool ) {
	219	if ( vik_goto_tool_get_coord ( gototool, vw, vvp, name, vcoord ) == 0 )
	220	return TRUE;
	221	}
	222	}
	223	return FALSE;
	224	}
	225
	226	void a_vik_goto(VikWindow vw, VikViewport vvp)
	227	{
	228	VikCoord new_center;
	229	gchar *s_str;
	230	gboolean more = TRUE;
	231
	232	if (goto_tools_list == NULL)
	233	{
	234	/* Empty list */
	235	display_no_tool(vw);
	236	return;
	237	}
	238
	239	do {
	240	s_str = a_prompt_for_goto_string(vw);
	241	if ((!s_str) \|\| (s_str[0] == 0)) {
	242	more = FALSE;
	243	}
	244
	245	else if (!vik_goto_tool_get_coord(g_list_nth_data (goto_tools_list, last_goto_tool), vw, vvp, s_str, &new_center)) {
	246	if (last_coord)
	247	g_free(last_coord);
	248	last_coord = g_malloc(sizeof(VikCoord));
	249	*last_coord = new_center;
	250	if (last_successful_goto_str)
	251	g_free(last_successful_goto_str);
	252	last_successful_goto_str = g_strdup(last_goto_str);
	253	vik_viewport_set_center_coord(vvp, &new_center);
	254	more = FALSE;
	255	}
	256	else if (!prompt_try_again(vw))
	257	more = FALSE;
	258	g_free(s_str);
	259	} while (more);
	260	}
	261
	262	#define HOSTIP_LATITUDE_PATTERN "\"lat\":\""
	263	#define HOSTIP_LONGITUDE_PATTERN "\"lng\":\""
	264	#define HOSTIP_CITY_PATTERN "\"city\":\""
	265	#define HOSTIP_COUNTRY_PATTERN "\"country_name\":\""
	266
	267	/**
	268	* Automatic attempt to find out where you are using:
	269	* 1. http://www.hostip.info ++
	270	* 2. if not specific enough fallback to using the default goto tool with a country name
	271	* ++ Using returned JSON information
	272	* c.f. with googlesearch.c - similar implementation is used here
	273	*
	274	* returns:
	275	* 0 if failed to locate anything
	276	* 1 if exact latitude/longitude found
	277	* 2 if position only as precise as a city
	278	* 3 if position only as precise as a country
	279	* @name: Contains the name of place found. Free this string after use.
	280	*/
	281	gint a_vik_goto_where_am_i ( VikViewport vvp, struct LatLon ll, gchar **name )
	282	{
	283	gint result = 0;
	284	*name = NULL;
	285
	286	gchar *tmpname = a_download_uri_to_tmp_file ( "http://api.hostip.info/get_json.php?position=true", NULL );
	287	//gchar *tmpname = g_strdup ("../test/hostip2.json");
	288	if (!tmpname) {
	289	return result;
	290	}
	291
	292	ll->lat = 0.0;
	293	ll->lon = 0.0;
	294
	295	gchar *pat;
	296	GMappedFile *mf;
	297	gchar *ss;
	298	gint fragment_len;
	299
	300	gchar lat_buf[32], lon_buf[32];
	301	lat_buf[0] = lon_buf[0] = '\0';
	302	gchar *country = NULL;
	303	gchar *city = NULL;
	304
	305	if ((mf = g_mapped_file_new(tmpname, FALSE, NULL)) == NULL) {
	306	g_critical(_("couldn't map temp file"));
	307	goto tidy;
	308	}
	309
	310	gsize len = g_mapped_file_get_length(mf);
	311	gchar *text = g_mapped_file_get_contents(mf);
	312
	313	if ((pat = g_strstr_len(text, len, HOSTIP_COUNTRY_PATTERN))) {
	314	pat += strlen(HOSTIP_COUNTRY_PATTERN);
	315	fragment_len = 0;
	316	ss = pat;
	317	while (*pat != '"') {
	318	fragment_len++;
	319	pat++;
	320	}
	321	country = g_strndup(ss, fragment_len);
	322	}
	323
	324	if ((pat = g_strstr_len(text, len, HOSTIP_CITY_PATTERN))) {
	325	pat += strlen(HOSTIP_CITY_PATTERN);
	326	fragment_len = 0;
	327	ss = pat;
	328	while (*pat != '"') {
	329	fragment_len++;
	330	pat++;
	331	}
	332	city = g_strndup(ss, fragment_len);
	333	}
	334
	335	if ((pat = g_strstr_len(text, len, HOSTIP_LATITUDE_PATTERN))) {
	336	pat += strlen(HOSTIP_LATITUDE_PATTERN);
	337	ss = lat_buf;
	338	if (*pat == '-')
	339	ss++ = pat++;
	340	while ((ss < (lat_buf + sizeof(lat_buf))) && (pat < (text + len)) &&
	341	(g_ascii_isdigit(pat) \|\| (pat == '.')))
	342	ss++ = pat++;
	343	*ss = '\0';
	344	ll->lat = g_ascii_strtod(lat_buf, NULL);
	345	}
	346
	347	if ((pat = g_strstr_len(text, len, HOSTIP_LONGITUDE_PATTERN))) {
	348	pat += strlen(HOSTIP_LONGITUDE_PATTERN);
	349	ss = lon_buf;
	350	if (*pat == '-')
	351	ss++ = pat++;
	352	while ((ss < (lon_buf + sizeof(lon_buf))) && (pat < (text + len)) &&
	353	(g_ascii_isdigit(pat) \|\| (pat == '.')))
	354	ss++ = pat++;
	355	*ss = '\0';
	356	ll->lon = g_ascii_strtod(lon_buf, NULL);
	357	}
	358
	359	if ( ll->lat != 0.0 && ll->lon != 0.0 ) {
	360	if ( ll->lat > -90.0 && ll->lat < 90.0 && ll->lon > -180.0 && ll->lon < 180.0 ) {
	361	// Found a 'sensible' & 'precise' location
	362	result = 1;
	363	*name = g_strdup ( _("Locality") ); //Albeit maybe not known by an actual name!
	364	}
	365	}
	366	else {
	367	// Hopefully city name is unique enough to lookup position on
	368	// Maybe for American places where hostip appends the State code on the end
	369	// But if the country code is not appended if could easily get confused
	370	// e.g. 'Portsmouth' could be at least
	371	// Portsmouth, Hampshire, UK or
	372	// Portsmouth, Viginia, USA.
	373
	374	// Try city name lookup
	375	if ( city ) {
	376	g_debug ( "%s: found city %s", __FUNCTION__, city );
	377	if ( strcmp ( city, "(Unknown city)" ) != 0 ) {
	378	VikCoord new_center;
	379	if ( vik_goto_place ( NULL, vvp, city, &new_center ) ) {
	380	// Got something
	381	vik_coord_to_latlon ( &new_center, ll );
	382	result = 2;
	383	*name = city;
	384	goto tidy;
	385	}
	386	}
	387	}
	388
	389	// Try country name lookup
	390	if ( country ) {
	391	g_debug ( "%s: found country %s", __FUNCTION__, country );
	392	if ( strcmp ( country, "(Unknown Country)" ) != 0 ) {
	393	VikCoord new_center;
	394	if ( vik_goto_place ( NULL, vvp, country, &new_center ) ) {
	395	// Finally got something
	396	vik_coord_to_latlon ( &new_center, ll );
	397	result = 3;
	398	*name = country;
	399	goto tidy;
	400	}
	401	}
	402	}
	403	}
	404
	405	tidy:
	406	g_mapped_file_unref ( mf );
	407	g_remove ( tmpname );
	408	g_free ( tmpname );
	409	return result;
	410	}