From 28478a808ecf81aa13cd859b2e5c338cd8491a1e Mon Sep 17 00:00:00 2001
From: Dmitry Volodin <dv@nocproject.org>
Date: Thu, 8 Aug 2019 12:49:15 +0300
Subject: [PATCH] noc confdb syntax `path` parameter

---
 commands/confdb.py         | 29 +++++++++++++++++++++++------
 docs/src/en/man/confdb.rst |  2 +-
 2 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/commands/confdb.py b/commands/confdb.py
index 77744f71c5..5bf54e6d5a 100755
--- a/commands/confdb.py
+++ b/commands/confdb.py
@@ -8,6 +8,7 @@
 
 # Python modules
 from __future__ import print_function
+import argparse
 
 # NOC modules
 from noc.core.management.base import BaseCommand
@@ -20,13 +21,14 @@ class Command(BaseCommand):
     def add_arguments(self, parser):
         subparsers = parser.add_subparsers(dest="cmd")
         # syntax command
-        subparsers.add_parser("syntax")
+        syntax_parser = subparsers.add_parser("syntax")
+        syntax_parser.add_argument("path", nargs=argparse.REMAINDER)
 
     def handle(self, cmd, *args, **options):
         return getattr(self, "handle_%s" % cmd)(*args, **options)
 
-    def handle_syntax(self, *args, **kwargs):
-        def dump_node(node, level=0):
+    def handle_syntax(self, path=None, *args, **kwargs):
+        def dump_node(node, level=0, recursive=True):
             indent = "  " * level
             if node.name:
                 label = "<%s>" % node.name
@@ -37,14 +39,29 @@ class Command(BaseCommand):
             if node.multi:
                 label = "*%s" % label
             self.print("%s%s" % (indent, label))
-            if node.children:
+            if recursive and node.children:
                 for nc in node.children:
                     dump_node(nc, level + 1)
 
+        def find_root(children, rest_path, level=0):
+            if not rest_path:
+                return children
+            if len(children) == 1 and not children[0].token:
+                dump_node(children[0], level, recursive=False)
+                return find_root(children[0].children, rest_path[1:], level=level + 1)
+            p = rest_path[0]
+            for cc in children:
+                if cc.token == p:
+                    dump_node(cc, level, recursive=False)
+                    return find_root(cc.children, rest_path[1:], level=level + 1)
+
         from noc.core.confdb.syntax.base import SYNTAX
 
-        for c in SYNTAX:
-            dump_node(c)
+        root = find_root(SYNTAX, path)
+        if not root:
+            return
+        for c in root:
+            dump_node(c, level=len(path) if path else 0)
 
 
 if __name__ == "__main__":
diff --git a/docs/src/en/man/confdb.rst b/docs/src/en/man/confdb.rst
index b231d6d745..2adf008cd6 100644
--- a/docs/src/en/man/confdb.rst
+++ b/docs/src/en/man/confdb.rst
@@ -17,7 +17,7 @@ Name
 Synopsis
 --------
 
-    noc confdb syntax
+    noc confdb syntax [path ...]
 
 Description
 -----------
-- 
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