Update some examples to use node_iter()

Simplifies the code. Should promote new APIs.

Also fix list_undefined.py for recent kernels. More environment
variables are referenced now.

1 files changed, 14 insertions, 23 deletions

diff --git a/examples/help_grep.py b/examples/help_grep.py
index 20a4911..f05c66f 100644
--- a/examples/help_grep.py
+++ b/examples/help_grep.py
@@ -42,30 +42,21 @@ if len(sys.argv) < 3:
 
 search = re.compile(sys.argv[2], re.IGNORECASE).search
 
-def search_tree(node):
-    while node:
-        match = False
+for node in Kconfig(sys.argv[1]).node_iter():
+    match = False
 
-        if isinstance(node.item, (Symbol, Choice)) and \
-           node.help is not None and search(node.help):
-            print(node.item)
-            match = True
+    if isinstance(node.item, (Symbol, Choice)) and \
+       node.help is not None and search(node.help):
+        print(node.item)
+        match = True
 
-        elif node.item == MENU and search(node.prompt[0]):
-            print('menu "{}"'.format(node.prompt[0]))
-            match = True
+    elif node.item == MENU and search(node.prompt[0]):
+        print('menu "{}"'.format(node.prompt[0]))
+        match = True
 
-        elif node.item == COMMENT and search(node.prompt[0]):
-            print('comment "{}"'.format(node.prompt[0]))
-            match = True
+    elif node.item == COMMENT and search(node.prompt[0]):
+        print('comment "{}"'.format(node.prompt[0]))
+        match = True
 
-        if match:
-            print("location: {}:{}\n".format(node.filename, node.linenr))
-
-        if node.list:
-            search_tree(node.list)
-
-        node = node.next
-
-kconf = Kconfig(sys.argv[1])
-search_tree(kconf.top_node)
+    if match:
+        print("location: {}:{}\n".format(node.filename, node.linenr))