Add gis_http_available function

This searches online and in the cache for flies matching a pattern and
adds them to a list. Typically it would be used to look for different
version of the same file. (i.e. at different points in time)

diff --git a/src/data/gis-http.c b/src/data/gis-http.c
index 739792a57a33669f180257aaf6cab4d511b412a2..d01701342f9d4fc507d1e4e4844a6b4a9d8c0850 100644 (file)
--- a/src/data/gis-http.c
+++ b/src/data/gis-http.c
@@ -181,3 +181,73 @@ gchar *gis_http_fetch(GisHttp *http, const gchar *uri, const char *local,
        /* TODO: free everything.. */
        return path;
 }
+
+/**
+ * gis_http_available:
+ * @http:    the #GisHttp connection to use
+ * @filter:  filter used to extract files from the index, or NULL
+ *           For example: "href=\"([^"]*)\""
+ * @cache:   path to the local cache, or NULL to not search the cache
+ * @extract: regex used to extract filenames from the page, should match the
+ *           filename as $1, or NULL to use /http="([^"])"/
+ * @index:   path to the index page, or NULL to not search online
+ *
+ * Look through the cache and an HTTP index page for a list of available files.
+ * The name of each file that matches the filter is added to the returned list.
+ *
+ * The list as well as the strings contained in it should be freed afterwards.
+ *
+ * Returns the list of matching filenames
+ */
+GList *gis_http_available(GisHttp *http,
+               gchar *filter, gchar *cache,
+               gchar *extract, gchar *index)
+{
+       g_debug("GisHttp: available - %s~=%s %s~=%s",
+                       filter, cache, extract, index);
+       GRegex *filter_re = g_regex_new(filter, 0, 0, NULL);
+       GList  *files = NULL;
+
+       /* Add cached files */
+       if (cache) {
+               const gchar *file;
+               gchar *path = _get_cache_path(http, cache);
+               GDir  *dir  = g_dir_open(path, 0, NULL);
+               while ((file = g_dir_read_name(dir)))
+                       if (g_regex_match(filter_re, file, 0, NULL))
+                               files = g_list_prepend(files, g_strdup(file));
+               g_free(path);
+       }
+
+
+       /* Add online files if online */
+       if (index) {
+               gchar tmp[16];
+               g_snprintf(tmp, sizeof(tmp), ".index.%x", g_random_int());
+               gchar *path = gis_http_fetch(http, index, tmp,
+                               GIS_REFRESH, NULL, NULL);
+               gchar *html;
+               g_file_get_contents(path, &html, NULL, NULL);
+
+               /* Match hrefs by default, this regex is not very accurate */
+               GRegex *extract_re = g_regex_new(
+                               extract ?: "href=\"([^\"]*)\"", 0, 0, NULL);
+               GMatchInfo *info;
+               g_regex_match(filter_re, html, 0, &info);
+               while (g_match_info_matches(info)) {
+                       gchar *file = g_match_info_fetch(info, 0);
+                       if (g_regex_match(filter_re, file, 0, NULL))
+                               files = g_list_prepend(files, file);
+                       else
+                               g_free(file);
+                       g_match_info_next(info, NULL);
+               }
+
+               g_match_info_free(info);
+               g_unlink(path);
+               g_free(path);
+               g_free(html);
+       }
+
+       return files;
+}

diff --git a/src/data/gis-http.h b/src/data/gis-http.h
index b7f1638d7d4592e1845d3d1e1262ab5939b1709f..489bf51ec44e8543bc8ab2e9fb089778cb183ad3 100644 (file)
--- a/src/data/gis-http.h
+++ b/src/data/gis-http.h
@@ -37,4 +37,8 @@ gchar *gis_http_fetch(GisHttp *http, const gchar *uri, const gchar *local,
                GisChunkCallback callback,
                gpointer user_data);
 
+GList *gis_http_available(GisHttp *http,
+               gchar *filter, gchar *cache,
+               gchar *extract, gchar *index);
+
 #endif