config for max history length

fix #177

config.def.h

@@ -25,6 +25,7 @@ int show_age_threshold = -1;    /* show age of notification, when notification i
 enum alignment align = left;    /* text alignment [left/center/right] */
 float bounce_freq = 1;          /* determines the bounce frequency (if activated) */
 int sticky_history = True;
+int history_length = 20;          /* max amount of notifications kept in history */
 int show_indicators = True;
 int verbosity = 0;
 int word_wrap = False;

dunst.c

@@ -149,16 +149,13 @@ void move_all_to_history()
                 notification_close(g_queue_peek_head_link(displayed)->data, 2);
         }
 
-        notification *n = g_queue_pop_head(queue);
-        while (n) {
-                g_queue_push_tail(history, n);
-                n = g_queue_pop_head(queue);
+        while (queue->length > 0) {
+                notification_close(g_queue_peek_head_link(queue)->data, 2);
         }
 }
 
 void history_pop(void)
 {
-
         if (g_queue_is_empty(history))
                 return;
 
@@ -171,6 +168,16 @@ void history_pop(void)
         wake_up();
 }
 
+void history_push(notification *n)
+{
+        if (settings.history_length > 0 && history->length >= settings.history_length) {
+                notification *to_free = g_queue_pop_head(history);
+                notification_free(to_free);
+        }
+
+        g_queue_push_tail(history, n);
+}
+
 void wake_up(void)
 {
         run(NULL);
@@ -298,9 +305,9 @@ int main(int argc, char *argv[])
 
         if (settings.startup_notification) {
                 notification *n = malloc(sizeof(notification));
-                n->appname = "dunst";
-                n->summary = "startup";
-                n->body = "dunst is up and running";
+                n->appname = strdup("dunst");
+                n->summary = strdup("startup");
+                n->body = strdup("dunst is up and running");
                 n->progress = 0;
                 n->timeout = 10;
                 n->urgency = LOW;

dunst.h

@@ -6,6 +6,7 @@
 #include <stdbool.h>
 
 #include "x.h"
+#include "notification.h"
 
 #define ERR(msg) printf("%s : %d\n", (msg), __LINE__)
 #define PERR(msg, errnum) printf("(%d) %s : %s\n", __LINE__, (msg), (strerror(errnum)))
@@ -34,6 +35,7 @@ void wake_up(void);
 
 void check_timeouts(void);
 void history_pop(void);
+void history_push(notification *n);
 void usage(int exit_status);
 void move_all_to_history(void);
 void print_version(void);

notification.c

@@ -469,7 +469,7 @@ int notification_close_by_id(int id, int reason)
                 notification *n = iter->data;
                 if (n->id == id) {
                         g_queue_remove(displayed, n);
-                        g_queue_push_tail(history, n);
+                        history_push(n);
                         target = n;
                         break;
                 }
@@ -480,7 +480,7 @@ int notification_close_by_id(int id, int reason)
                 notification *n = iter->data;
                 if (n->id == id) {
                         g_queue_remove(queue, n);
-                        g_queue_push_tail(history, n);
+                        history_push(n);
                         target = n;
                         break;
                 }

notification.h

@@ -42,6 +42,7 @@ typedef struct _notification {
 } notification;
 
 int notification_init(notification * n, int id);
+void notification_free(notification * n);
 int notification_close_by_id(int id, int reason);
 int notification_cmp(const void *a, const void *b);
 int notification_cmp_data(const void *a, const void *b, void *data);

settings.c

@@ -165,6 +165,10 @@ void load_settings(char *cmdline_config_path)
             option_get_bool("global", "sticky_history", "-sticky_history",
                             sticky_history,
                             "Don't timeout notifications popped up from history");
+        settings.history_length = 
+                option_get_int("global", "history_length", "-history_length",
+                                history_length,
+                                "Max amount of notifications kept in history");
         settings.show_indicators =
             option_get_bool("global", "show_indicators", "-show_indicators",
 			    show_indicators,

settings.h

@@ -27,6 +27,7 @@ typedef struct _settings {
         enum alignment align;
         float bounce_freq;
         int sticky_history;
+        int history_length;
 	int show_indicators;
         int verbosity;
         int word_wrap;