Recursive folders

* Allow recursive traversing of folders with -r flag
* Print useful error in case of no image found
* Fixes issues 4 & 6

src/main.cpp

@@ -10,7 +10,7 @@
 #include <stdio.h>
 
 void usage(std::string programName) {
-    std::cerr << "Usage: " << programName << " [-t rotation_seconds] [-o background_opacity(0..255)] [-b blur_radius] -p image_folder" << std::endl;
+    std::cerr << "Usage: " << programName << " [-t rotation_seconds] [-o background_opacity(0..255)] [-b blur_radius] -p image_folder -r" << std::endl;
 }
 
 int main(int argc, char *argv[])
@@ -22,7 +22,8 @@ int main(int argc, char *argv[])
 
     MainWindow w;
     int opt;
-    while ((opt = getopt(argc, argv, "b:p:t:o:")) != -1) {
+    bool recursive = false;
+    while ((opt = getopt(argc, argv, "b:p:t:o:r")) != -1) {
         switch (opt) {
         case 'p':
             path = optarg;
@@ -36,6 +37,9 @@ int main(int argc, char *argv[])
         case 'o':
             w.setBackgroundOpacity(atoi(optarg));
             break;
+        case 'r':
+            recursive = true;
+            break;
         default: /* '?' */
             usage(argv[0]);
             return 1;
@@ -49,7 +53,7 @@ int main(int argc, char *argv[])
     }
     w.show();
 
-    ImageSelector is(w, rotationSeconds * 1000, path);
+    ImageSelector is(w, rotationSeconds * 1000, path, recursive);
     is.start();
     return a.exec();
 }