Blur and Command line opts

* blur background image
* command line options for
        * background blur radius
        * background opacity
        * path to image folder
        * timeout for password rotation

src/main.cpp

@@ -5,27 +5,51 @@
 #include <sys/file.h>
 #include <errno.h>
 
+#include <unistd.h>
+#include <stdlib.h>
+#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;
+}
+
 int main(int argc, char *argv[])
 {
+    unsigned int rotationSeconds = 30;
+    std::string path = "";
 
-    int pid_file = open("/tmp/slide.pid", O_CREAT | O_RDWR, 0666);
-    int rc = flock(pid_file, LOCK_EX | LOCK_NB);
-    if(rc) {
-        if(EWOULDBLOCK == errno) {
-            std::cout << "Already running. Exiting" << std::endl;
-            return 0;
-        }
-    }
-    if (argc < 2) {
-        std::cout << "Error: Path expected." << std::endl;
-        return 1;
-    }
     QApplication a(argc, argv);
 
     MainWindow w;
+    int opt;
+    while ((opt = getopt(argc, argv, "b:p:t:o:")) != -1) {
+        switch (opt) {
+        case 'p':
+            path = optarg;
+            break;
+        case 't':
+            rotationSeconds = atoi(optarg);
+            break;
+        case 'b':
+            w.setBlurRadius(atoi(optarg));
+            break;
+        case 'o':
+            w.setBackgroundOpacity(atoi(optarg));
+            break;
+        default: /* '?' */
+            usage(argv[0]);
+            return 1;
+        }
+    }
+
+    if (path.empty()) {
+        std::cout << "Error: Path expected." << std::endl;
+        usage(argv[0]);
+        return 1;
+    }
     w.show();
 
-    ImageSelector is(w, 30000, argv[1]);
+    ImageSelector is(w, rotationSeconds * 1000, path);
     is.start();
     return a.exec();
 }