* Fixed union in XPATH [XPATH issues #219](https://github.com/clicon/clixon/issues/219)

CHANGELOG.md

@@ -65,6 +65,7 @@ Users may have to change how they access the system
 	
 ### Corrected Bugs
 
+* Fix Union in xpath [XPATH issues #219](https://github.com/clicon/clixon/issues/219)
 * Fix: XPath:s used in netconf (eg get-config) did not correctly access default values
 * [RESTCONF GET request of single-key list with empty string returns all elements #213](https://github.com/clicon/clixon/issues/213)
 * [RESTCONF GETof lists with empty string keys does not work #214](https://github.com/clicon/clixon/issues/214)

apps/cli/cli_generate.c

@@ -127,7 +127,6 @@ cli_expand_var_generate(clicon_handle h,
 	retval = 1;
 	goto done;
     }
-
     if (yang2api_path_fmt(ys, 1, &api_path_fmt) < 0)
 	goto done;
     cprintf(cb, "|<%s:%s",  yang_argument_get(ys), 

example/main/example_cli.cli

@@ -69,6 +69,7 @@ discard("Discard edits (rollback 0)"), discard_changes();
 compare("Compare running and candidate"), compare_dbs((int32)1);
 
 show("Show a particular state of the system"){
+    auto("Show expand") @datamodel, cli_show_auto("candidate", "xml");  
     xpath("Show configuration") <xpath:string>("XPATH expression") <ns:string>("Namespace"), show_conf_xpath("candidate");
     version("Show version"), cli_show_version("candidate", "text", "/");
     options("Show clixon options"), cli_show_options();

lib/src/clixon_datastore_write.c

@@ -488,10 +488,10 @@ text_modify(clicon_handle       h,
 
 		    /* If origin body has namespace definitions, copy them. The reason is that
 		     * some bodies rely on namespace prefixes, such as NACM path, but there is 
-		     * no way we can now this here.
+		     * no way we can know this here.
 		     * However, this may lead to namespace collisions if these prefixes are not
 		     * canonical, and may collide with the assign_namespace_element() above (but that 
-		     * is for element sysmbols)
+		     * is for element symbols)
 		     * Oh well.
 		     */
 		    if (assign_namespace_body(x1, x1bstr, x0) < 0)

lib/src/clixon_xpath.c

@@ -34,6 +34,14 @@
 
  * Clixon XML XPATH 1.0 according to https://www.w3.org/TR/xpath-10
  *
+ * Note on xcur parameter to most xpath functions:
+ * The W3 standard defines the document root / element as the top-level.
+ * In the clixon xpath API, the document root is defined as the top of the xml tree. 
+ * The xcur argument of xpath_first and others is the "current" xml node (xcur) which can
+ * be any node in that tree, not necessarily the document root.
+ * This is convenient if you want to use relative xpaths from any location in the tree (eg ../../foo/bar).
+ * It may be confusing if you expect xcur to be the root node.
+ *
  * Some notes on namespace extensions in Netconf/Yang
  * 1) The xpath is not "namespace-aware" in the sense that if you look for a path, eg 
  *    "n:a/n:b", those must match the XML, so they need to match prefixes AND name in the xml 

lib/src/clixon_xpath_parse.y

@@ -387,7 +387,7 @@ addexpr     : addexpr ADDOP unionexpr { $$=xp_new(XP_ADD,$2,NULL,NULL,NULL,$1, $
             ;
 
 /* node-set */
-unionexpr   : unionexpr '|' pathexpr { $$=xp_new(XP_UNION,A_NAN,NULL,NULL,NULL,$1, $3);clicon_debug(3,"unionexpr-> unionexpr | pathexpr"); } 
+unionexpr   : unionexpr '|' pathexpr { $$=xp_new(XP_UNION,XO_UNION,NULL,NULL,NULL,$1, $3);clicon_debug(3,"unionexpr-> unionexpr | pathexpr"); } 
             | pathexpr { $$=xp_new(XP_UNION,A_NAN,NULL,NULL,NULL,$1, NULL);clicon_debug(3,"unionexpr-> pathexpr"); } 
             ;
 

test/test_openconfig_interfaces.sh

@@ -111,6 +111,10 @@ expectpart "$($clixon_cli -1 -f $cfg show conf xml)" 0 "^<interfaces xmlns=\"htt
 new "cli set interfaces interface <tab> complete: e"
 expectpart "$(echo "set interfaces interface 	" | $clixon_cli -f $cfg)" 0 "interface e"
 
+# XXX See https://github.com/clicon/clixon/issues/218
+#new "cli set interfaces interface e <tab> complete: not ethernet"
+#expectpart "$(echo "set interfaces interface e 	" | $clixon_cli -f $cfg)" 0 config hold-time subinterfaces --not-- ethernet 
+
 if [ $BE -ne 0 ]; then
     new "Kill backend"
     # Check if premature kill

test/test_xpath.sh

@@ -88,6 +88,9 @@ new "xpath /aaa/bbb"
 expecteof "$clixon_util_xpath -f $xml -p /aaa/bbb" 0 "" "^0:<bbb x=\"hello\"><ccc>42</ccc></bbb>
 1:<bbb x=\"bye\"><ccc>99</ccc></bbb>$"
 
+new "xpath /aaa/bbb union "
+expecteof "$clixon_util_xpath -f $xml -p aaa/bbb[ccc=42]|aaa/ddd[ccc=22]" 0 "" '^nodeset:0:<bbb x="hello"><ccc>42</ccc></bbb>1:<ddd><ccc>22</ccc></ddd>$'
+
 new "xpath //bbb"
 expecteof "$clixon_util_xpath -f $xml -p //bbb" 0 "" "0:<bbb x=\"hello\"><ccc>42</ccc></bbb>
 1:<bbb x=\"bye\"><ccc>99</ccc></bbb>"