-extern void focusnext(Arg arg); /* focuses next visible client, arg is ignored */
-extern void focusprev(Arg arg); /* focuses previous visible client, arg is ignored */
-extern void incmasterw(Arg arg); /* increments the master width with arg's index value */
-extern void incnmaster(Arg arg); /* increments nmaster with arg's index value */
-extern void initlayouts(void); /* initialize layout array */
-extern Client *nexttiled(Client *c); /* returns tiled successor of c */
-extern void restack(void); /* restores z layers of all clients */
-extern void setlayout(Arg arg); /* sets layout, -1 toggles */
-extern void togglemax(Arg arg); /* toggles maximization of versatile client */
-extern void versatile(void); /* arranges all windows versatile */
+void floating(void); /* arranges all windows floating */
+void focusclient(const char *arg); /* focuses next(1)/previous(-1) visible client */
+void inchratio(const char *arg); /* increments the horizontal tile ratio with arg's value */
+void incvratio(const char *arg); /* increments the vertical tile ratio with arg's value */
+void incnmaster(const char *arg); /* increments nmaster with arg's index value */
+void initlayouts(void); /* initialize layout array */
+Client *nexttiled(Client *c); /* returns tiled successor of c */
+void restack(void); /* restores z layers of all clients */
+void setlayout(const char *arg); /* sets layout, NULL means next layout */
+void togglebar(const char *arg); /* shows/hides the bar */
+void togglemax(const char *arg); /* toggles maximization of floating client */
+void zoom(const char *arg); /* zooms the focused client to master area, arg is ignored */