plugins/document-manager/file_history.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU Library General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  15  */
  16
  17
  18 #include <stdio.h>
  19 #include <string.h>
  20
  21 #include <glib.h>
  22
  23 #include "file_history.h"
  24
  25 #define OPT_ENTRIES 5
  26 #define MAX_ENTRIES 6
  27
  28 typedef struct _AnFileHistory
  29 {
  30         GList *items;
  31         GList *current;
  32         gboolean history_move;
  33 } AnFileHistory;
  34
  35 static AnFileHistory *s_history = NULL;
  36
  37 static void an_file_history_init (void)
  38 {
  39         s_history = g_new(AnFileHistory, 1);
  40         s_history->items = NULL;
  41         s_history->current = NULL;
  42         s_history->history_move = FALSE;
  43 }
  44
  45 AnHistFile *an_hist_file_new (GFile *file, gint line)
  46 {
  47         AnHistFile *h_file;
  48
  49         g_return_val_if_fail(file, NULL);
  50
  51         h_file= g_new(AnHistFile, 1);
  52         h_file->file = g_object_ref (file);
  53         h_file->line = line;
  54         return h_file;
  55 }
  56
  57 void an_hist_file_free(AnHistFile *h_file)
  58 {
  59         g_return_if_fail(h_file);
  60         g_object_unref (h_file->file);
  61         g_free(h_file);
  62 }
  63
  64 static void an_hist_items_free(GList *items)
  65 {
  66         GList *tmp;
  67
  68         g_return_if_fail(items);
  69         for (tmp = items; tmp; tmp = g_list_next(tmp))
  70                 an_hist_file_free((AnHistFile *) tmp->data);
  71         g_list_free(items);
  72 }
  73
  74 void an_file_history_reset(void)
  75 {
  76         g_return_if_fail(s_history && s_history->items);
  77
  78         an_hist_items_free(s_history->items);
  79         s_history->items = NULL;
  80         s_history->current = NULL;
  81 }
  82
  83 void an_file_history_push (GFile *file, gint line)
  84 {
  85         AnHistFile *h_file;
  86
  87         g_return_if_fail (file);
  88
  89         if (!s_history)
  90                 an_file_history_init();
  91
  92         if (s_history->current)
  93         {
  94                 GList *next;
  95
  96                 /* Only update line number when called by forward/backward */
  97                 if (s_history->history_move)
  98                 {
  99                         AnHistFile *h_file = (AnHistFile *) s_history->current->data;
 100
 101                         if (g_file_equal (file,h_file->file))
 102                         {
 103                                 h_file->line = line;
 104                         }
 105                         return;
 106                 }
 107
 108                 next = s_history->current->next;
 109                 s_history->current->next = NULL;
 110                 an_hist_items_free(s_history->items);
 111
 112                 s_history->items = next;
 113                 if (next) next->prev = NULL;
 114                 s_history->current = NULL;
 115                 if (g_list_length(s_history->items) > MAX_ENTRIES)
 116                 {
 117                         GList *tmp = g_list_nth(s_history->items, OPT_ENTRIES);
 118                         an_hist_items_free(tmp->next);
 119                         tmp->next = NULL;
 120                 }
 121         }
 122         h_file = an_hist_file_new(file, line);
 123         s_history->items = g_list_prepend(s_history->items, h_file);
 124         s_history->current = NULL;
 125 }
 126
 127 void an_file_history_back(AnjutaDocman *docman)
 128 {
 129         AnHistFile *h_file;
 130         GList *current;
 131
 132         if (!(s_history && (!s_history->current || s_history->current->next)))
 133                 return;
 134
 135         current = s_history->current ? s_history->current->next : s_history->items;
 136         h_file = (AnHistFile *) current->data;
 137
 138         s_history->history_move = TRUE;
 139         anjuta_docman_goto_file_line_mark (docman, h_file->file,
 140                                                                            h_file->line, FALSE);
 141         s_history->history_move = FALSE;
 142
 143         s_history->current = current;
 144 }
 145
 146 void an_file_history_forward(AnjutaDocman *docman)
 147 {
 148         AnHistFile *h_file;
 149         GList *current;
 150
 151         if (!(s_history && s_history->current && s_history->current->prev))
 152                 return;
 153
 154         current = s_history->current->prev;
 155         h_file = (AnHistFile *) current->data;
 156
 157         s_history->history_move = TRUE;
 158         anjuta_docman_goto_file_line_mark(docman, h_file->file,
 159                                                                           h_file->line, FALSE);
 160         s_history->history_move = FALSE;
 161
 162         s_history->current = current;
 163 }
 164
 165 void an_file_history_dump(void)
 166 {
 167         GList *tmp;
 168         AnHistFile *h_file;
 169
 170         g_return_if_fail(s_history && s_history->items);
 171         fprintf(stderr, "--------------------------\n");
 172         for (tmp = s_history->items; tmp; tmp = g_list_next(tmp))
 173         {
 174                 gchar *uri;
 175                 h_file = (AnHistFile *) tmp->data;
 176                 uri = g_file_get_uri (h_file->file);
 177                 fprintf(stderr, "%s:%d", uri, h_file->line);
 178                 g_free (uri);
 179                 if (tmp == s_history->current)
 180                         fprintf(stderr, " (*)");
 181                 fprintf(stderr, "\n");
 182         }
 183         fprintf(stderr, "--------------------------\n");
 184 }
 185
 186 void an_file_history_free(void)
 187 {
 188         an_file_history_reset();
 189         g_free(s_history);
 190         s_history = NULL;
 191 }