* Start of a helper tool to evaluate job expressions efficiently.

src/c/Makefile

@@ -0,0 +1,5 @@
+NIX = /home/eelco/Dev/nix/inst
+ATERM = /home/eelco/Dev/nix/externals/inst-aterm
+
+eval-jobs: eval-jobs.cc
+	libtool --mode=link g++ -o eval-jobs eval-jobs.cc -I$(NIX)/include/nix -I$(ATERM)/include -L$(NIX)/lib/nix/ -lmain -lexpr -L$(ATERM)/lib -lATerm

src/c/eval-jobs.cc

@@ -0,0 +1,41 @@
+#include <map>
+#include <iostream>
+
+#include "shared.hh"
+#include "store-api.hh"
+#include "eval.hh"
+#include "parser.hh"
+#include "expr-to-xml.hh"
+
+using namespace nix;
+
+
+void printHelp()
+{
+    std::cout << "Syntax: eval-jobs <expr>\n";
+}
+
+
+void run(Strings args)
+{
+    EvalState state;
+    Path releaseExpr;
+    
+    for (Strings::iterator i = args.begin(); i != args.end(); ) {
+        string arg = *i++;
+        if (arg[0] == '-')
+            throw UsageError(format("unknown flag `%1%'") % arg);
+        else
+            releaseExpr = arg;
+    }
+
+    store = openStore();
+
+    Expr e = evalExpr(state, parseExprFromFile(state, releaseExpr));
+    
+    PathSet context;
+    printTermAsXML(e, std::cout, context);
+}
+
+
+string programId = "eval-jobs";