Remove the --xml query command option

The `--graphml` option can be used instead.

src/nix-store/nix-store.cc

@@ -8,7 +8,6 @@
 #include "shared.hh"
 #include "util.hh"
 #include "worker-protocol.hh"
-#include "xmlgraph.hh"
 #include "graphml.hh"
 
 #include <iostream>
@@ -274,7 +273,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
     enum QueryType
         { qDefault, qOutputs, qRequisites, qReferences, qReferrers
         , qReferrersClosure, qDeriver, qBinding, qHash, qSize
-        , qTree, qGraph, qXml, qGraphML, qResolve, qRoots };
+        , qTree, qGraph, qGraphML, qResolve, qRoots };
     QueryType query = qDefault;
     bool useOutput = false;
     bool includeOutputs = false;
@@ -300,7 +299,6 @@ static void opQuery(Strings opFlags, Strings opArgs)
         else if (i == "--size") query = qSize;
         else if (i == "--tree") query = qTree;
         else if (i == "--graph") query = qGraph;
-        else if (i == "--xml") query = qXml;
         else if (i == "--graphml") query = qGraphML;
         else if (i == "--resolve") query = qResolve;
         else if (i == "--roots") query = qRoots;
@@ -405,16 +403,6 @@ static void opQuery(Strings opFlags, Strings opArgs)
             break;
         }
 
-        case qXml: {
-            PathSet roots;
-            for (auto & i : opArgs) {
-                PathSet paths = maybeUseOutputs(store->followLinksToStorePath(i), useOutput, forceRealise);
-                roots.insert(paths.begin(), paths.end());
-            }
-            printXmlGraph(ref<Store>(store), roots);
-            break;
-        }
-
         case qGraphML: {
             PathSet roots;
             for (auto & i : opArgs) {

src/nix-store/xmlgraph.cc

@@ -1,66 +0,0 @@
-#include "xmlgraph.hh"
-#include "util.hh"
-#include "store-api.hh"
-
-#include <iostream>
-
-
-using std::cout;
-
-namespace nix {
-
-
-static inline const string & xmlQuote(const string & s)
-{
-    // Luckily, store paths shouldn't contain any character that needs to be
-    // quoted.
-    return s;
-}
-
-
-static string makeEdge(const string & src, const string & dst)
-{
-    format f = format("  <edge src=\"%1%\" dst=\"%2%\"/>\n")
-      % xmlQuote(src) % xmlQuote(dst);
-    return f.str();
-}
-
-
-static string makeNode(const string & id)
-{
-    format f = format("  <node name=\"%1%\"/>\n") % xmlQuote(id);
-    return f.str();
-}
-
-
-void printXmlGraph(ref<Store> store, const PathSet & roots)
-{
-    PathSet workList(roots);
-    PathSet doneSet;
-
-    cout << "<?xml version='1.0' encoding='utf-8'?>\n"
-         << "<nix>\n";
-
-    while (!workList.empty()) {
-        Path path = *(workList.begin());
-        workList.erase(path);
-
-        if (doneSet.find(path) != doneSet.end()) continue;
-        doneSet.insert(path);
-
-        cout << makeNode(path);
-
-        for (auto & p : store->queryPathInfo(path)->references) {
-            if (p != path) {
-                workList.insert(p);
-                cout << makeEdge(p, path);
-            }
-        }
-
-    }
-
-    cout << "</nix>\n";
-}
-
-
-}

src/nix-store/xmlgraph.hh

@@ -1,11 +0,0 @@
-#pragma once
-
-#include "types.hh"
-
-namespace nix {
-
-class Store;
-
-void printXmlGraph(ref<Store> store, const PathSet & roots);
-
-}