Implemented bouncing text

config.def.h

@@ -18,6 +18,7 @@ int indicate_hidden = True;     /* show count of hidden messages */
 int idle_threshold = 0;         /* don't timeout notifications when idle for x seconds */
 int show_age_threshold = -1;    /* show age of notification, when notification is older than x seconds */
 enum alignment align = left;    /* text alignment [left/center/right] */
+float bounce_freq = 1;          /* determines the bounce frequency (if activated) */
 int sticky_history = True;
 int verbosity = 0;
 int word_wrap = False;

config.mk

@@ -23,7 +23,7 @@ INIFLAGS = -DINI_ALLOW_MULTILINE=0
 
 # includes and libs
 INCS = -I${X11INC} $(shell pkg-config --cflags dbus-1 libxdg-basedir) ${XFTINC}
-LIBS = -L${X11LIB} -lX11 -lXss ${XFTLIBS} ${XINERAMALIBS} $(shell pkg-config --libs dbus-1 libxdg-basedir)
+LIBS = -lm -L${X11LIB} -lX11 -lXss ${XFTLIBS} ${XINERAMALIBS} $(shell pkg-config --libs dbus-1 libxdg-basedir)
 
 # flags
 CPPFLAGS += -D_BSD_SOURCE -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS} ${INIFLAGS}

dunst.c

@@ -9,6 +9,8 @@
 #include <stdlib.h>
 #include <string.h>
 #include <fnmatch.h>
+#include <sys/time.h>
+#include <math.h>
 #include <getopt.h>
 #include <X11/Xlib.h>
 #include <X11/XKBlib.h>
@@ -474,13 +476,22 @@ char *draw_txt_get_line(draw_txt * dt, int line)
 
 int calculate_x_offset(int line_width, int text_width)
 {
+        int leftover = line_width - text_width;
+        struct timeval t;
+        float pos;
+        /* If the text is wider than the frame, bouncing is enabled and word_wrap disabled */
+        if (line_width < text_width && bounce_freq > 0.0001 && !word_wrap) {
+                gettimeofday(&t, NULL);
+                pos = ((t.tv_sec % 100) * 1e6 + t.tv_usec) / (1e6 / bounce_freq);
+                return (1 + sinf(2 * 3.14159 * pos)) * leftover / 2;
+        }
         switch (align) {
         case left:
                 return 0;
         case center:
-                return (line_width - text_width) / 2;
+                return leftover / 2;
         case right:
-                return line_width - text_width;
+                return leftover;
         default:
                 /* this can't happen */
                 return 0;
@@ -1552,6 +1563,8 @@ dunst_ini_handle(void *user_data, const char *section,
                         close_all_ks.str = dunst_ini_get_string(value);
                 } else if (strcmp(name, "history_key") == 0) {
                         history_ks.str = dunst_ini_get_string(value);
+                } else if (strcmp(name, "bounce_freq") == 0) {
+                        bounce_freq = atof(value);
                 } else if (strcmp(name, "alignment") == 0) {
                         if (strcmp(value, "left") == 0)
                                 align = left;

dunstrc

@@ -19,6 +19,9 @@
     # Possible values are "left", "center" and "right"
     alignment = left
 
+    # determines the bounce frequency (in hz, 0 to disable)
+    bounce_freq = 0
+
     # show age of message if message is older than show_age_threshold seconds.
     # set to -1 to disable
     show_age_threshold = 60;