update stemplate for smart merge

stemplate.py

@@ -38,3 +38,76 @@ def kv(obj):
         return enumerate([])
     else:
         raise Exception("{} {}".format(obj, type(obj)))
+
+
+def isElementry(val):
+    return isinstance(
+        val,
+        (int, long, bool, str, unicode))
+
+
+def isTerminal(val):
+    if isElementry(val) is True:
+        return True
+    if isinstance(val, list):
+        return all(isElementry(vv) for vv in val)
+
+    return False
+
+
+def cfgmerge(dest, src):
+    dest_keys = dest.keys()
+    for key in src.keys():
+        if key == src.idfield:
+            continue
+        val = src[key]
+        if key == 'value' or isTerminal(val.obj):
+            dest[key] = val.obj
+            continue
+        if key in dest_keys:
+            cfgmerge(dest[key], src[key])
+        else:
+            print(
+                "{} key {} is missing from {} ".format(
+                    src,
+                    key,
+                    dest_keys))
+            dest[key] = val.obj
+
+
+class Cfg(object):
+    def __init__(self, obj, idfield='identifier', key=""):
+        self.obj = obj
+        self.idfield = idfield
+        self.key = key
+
+    def __getitem__(self, key):
+        if isinstance(self.obj, dict):
+            return Cfg(self.obj[key], self.idfield, self.key+"."+key)
+        if isinstance(self.obj, list):
+            if isinstance(key, (str, unicode)):
+                val = next(vv for vv in self.obj if vv[self.idfield] == key)
+                return Cfg(val, self.idfield, self.key+"."+key)
+            elif isinstance(key, (int, long)):
+                return Cfg(self.obj[key], self.idfield, self.key+"."+key)
+
+    def __setitem__(self, key, val):
+        if isinstance(self.obj, dict):
+            self.obj[key] = val
+
+    def keys(self):
+        if isinstance(self.obj, dict):
+            return self.obj.keys()
+        elif isinstance(self.obj, list):
+            return [v[self.idfield] for v in self.obj]
+
+    def get(self, jpath):
+        vx = self
+        for comp in jpath.split('.'):
+            if comp == '':
+                continue
+            vx = vx[comp]
+        return vx
+
+    def __repr__(self):
+        return self.key