[snappy] snappy: add subtitle auto detecting feature

[Luis de Bethencourt <luisbg src gnome org>]

commit 166a980f20ef3a9c574a1b445db492b237068f78
Author: Felipe Martins <felipsmartins gmail com>
Date:   Sat Oct 10 22:57:56 2015 +0100

    snappy: add subtitle auto detecting feature

 src/snappy.c |   14 +++++++++++++-
 src/utils.c  |   21 +++++++++++++++++++++
 src/utils.h  |    2 ++
 3 files changed, 36 insertions(+), 1 deletions(-)
---
diff --git a/src/snappy.c b/src/snappy.c
index 94b6e5b..92c967e 100644
--- a/src/snappy.c
+++ b/src/snappy.c
@@ -248,8 +248,20 @@ main (int argc, char *argv[])
   gst_object_unref (engine->bus);
 
   /* Get uri to load */
-  if (uri_list)
+  if (uri_list) {
     uri = g_list_first (uri_list)->data;
+    /* based on video filename we can guess subtitle file (.srt files only) */
+    if (NULL == suburi) {
+      gchar suburi_path_guessing[1024]; //buffer
+      gchar *uri_no_extension = strip_filename_extension (uri);
+
+      sprintf (suburi_path_guessing, "%s.srt", uri_no_extension);
+      /* subtitle file exists, defaults for it */
+      if (g_file_test (g_filename_from_uri (suburi_path_guessing, NULL, NULL),
+              G_FILE_TEST_EXISTS))
+        suburi = suburi_path_guessing;
+    }
+  }
 
   /* Load engine and start interface */
   engine_load_uri (engine, uri);
diff --git a/src/utils.c b/src/utils.c
index d13b99a..5ba973a 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -89,3 +89,24 @@ clean_brackets_in_uri (gchar * uri)
 
   return clean_uri;
 }
+
+gchar *
+strip_filename_extension (gchar * filename)
+{
+  gchar *retstr;
+  gchar *lastdot;
+
+  if (NULL == filename)
+    return NULL;
+
+  if (NULL == (retstr = malloc (strlen (filename) + 1)))
+    return NULL;
+
+  strcpy (retstr, filename);
+  lastdot = strrchr (retstr, '.');
+
+  if (NULL != lastdot)
+    *lastdot = '\0';
+
+  return retstr;
+}
diff --git a/src/utils.h b/src/utils.h
index eb8c454..9f6922c 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -26,12 +26,14 @@
 #include <glib.h>
 #include <gio/gio.h>
 #include <gst/gst.h>
+#include <string.h>
 
 G_BEGIN_DECLS
 
 gchar * cut_long_filename (gchar * filename, gint length);
 gchar * clean_uri (gchar * input_arg);
 gchar * clean_brackets_in_uri (gchar * uri);
+gchar * strip_filename_extension (gchar * filename);
 
 G_END_DECLS
 #endif /* __UTILS_H__ */