From: Michael Stapelberg <michael@stapelberg.de>
Date: Sat, 14 May 2011 20:11:09 +0000 (+0200)
Subject: introduce the NODES_FOREACH and GREP_FIRST macros
X-Git-Tag: tree-pr3~26
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=0e2d58347c0290cb4dbed92e3b47dbabd0005318;p=i3%2Fi3

introduce the NODES_FOREACH and GREP_FIRST macros
---

diff --git a/include/util.h b/include/util.h
index 610e701e..df0e3065 100644
--- a/include/util.h
+++ b/include/util.h
@@ -25,6 +25,21 @@
 #define FOR_TABLE(workspace) \
                         for (int cols = 0; cols < (workspace)->cols; cols++) \
                                 for (int rows = 0; rows < (workspace)->rows; rows++)
+
+#define NODES_FOREACH(head) \
+    for (Con *child = (Con*)-1; (child == (Con*)-1) && ((child = 0), true);) \
+        TAILQ_FOREACH(child, &((head)->nodes_head), nodes)
+
+/* greps the ->nodes of the given head and returns the first node that matches the given condition */
+#define GREP_FIRST(dest, head, condition) \
+    NODES_FOREACH(head) { \
+        if (!(condition)) \
+            continue; \
+        \
+        (dest) = child; \
+        break; \
+    }
+
 #define FREE(pointer) do { \
         if (pointer != NULL) { \
                 free(pointer); \