add i3-nagbar. tells you about config file errors (for example)

include/config.h

@@ -32,6 +32,8 @@ extern SLIST_HEAD(modes_head, Mode) modes;
  *
  */
 struct context {
+        bool has_errors;
+
         int line_number;
         char *line_copy;
         const char *filename;
@@ -190,6 +192,17 @@ void switch_mode(const char *new_mode);
  */
 Binding *get_binding(uint16_t modifiers, xcb_keycode_t keycode);
 
+/**
+ * Kills the configerror i3-nagbar process, if any.
+ *
+ * Called when reloading/restarting.
+ *
+ * If wait_for_it is set (restarting), this function will waitpid(), otherwise,
+ * ev is assumed to handle it (reloading).
+ *
+ */
+void kill_configerror_nagbar(bool wait_for_it);
+
 /* prototype for src/cfgparse.y */
 void parse_file(const char *f);
 

include/i3.h

@@ -32,5 +32,6 @@ extern SLIST_HEAD(stack_wins_head, Stack_Window) stack_wins;
 extern uint8_t root_depth;
 extern bool xcursor_supported, xkb_supported;
 extern xcb_window_t root;
+extern struct ev_loop *main_loop;
 
 #endif

include/log.h

@@ -1,9 +1,9 @@
 /*
- * vim:ts=8:expandtab
+ * vim:ts=4:sw=4:expandtab
  *
  * i3 - an improved dynamic tiling window manager
  *
- * © 2009-2010 Michael Stapelberg and contributors
+ * © 2009-2011 Michael Stapelberg and contributors
  *
  * See file LICENSE for license information.
  *
@@ -21,6 +21,14 @@
 #define DLOG(fmt, ...) debuglog(LOGLEVEL, "%s:%s:%d - " fmt, __FILE__, __FUNCTION__, __LINE__, ##__VA_ARGS__)
 
 extern char *loglevels[];
+extern char *errorfilename;
+
+/**
+ * Initializes logging by creating an error logfile in /tmp (or
+ * XDG_RUNTIME_DIR, see get_process_filename()).
+ *
+ */
+void init_logging();
 
 /**
  * Enables the given loglevel.

include/util.h

@@ -102,6 +102,23 @@ char *sstrdup(const char *str);
  */
 void start_application(const char *command);
 
+/**
+ * exec()s an i3 utility, for example the config file migration script or
+ * i3-nagbar. This function first searches $PATH for the given utility named,
+ * then falls back to the dirname() of the i3 executable path and then falls
+ * back to the dirname() of the target of /proc/self/exe (on linux).
+ *
+ * This function should be called after fork()ing.
+ *
+ * The first argument of the given argv vector will be overwritten with the
+ * executable name, so pass NULL.
+ *
+ * If the utility cannot be found in any of these locations, it exits with
+ * return code 2.
+ *
+ */
+void exec_i3_utility(char *name, char *argv[]);
+
 /**
  * Checks a generic cookie for errors and quits with the given message if
  * there was an error.