From c3cc2262b7244f476223e2aacb196c124cebe6b7 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Thu, 5 Mar 2009 14:59:43 +0000
Subject: [PATCH] * Start of a helper tool to evaluate job expressions
 efficiently.

---
 src/c/Makefile     |  5 +++++
 src/c/eval-jobs.cc | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 src/c/Makefile
 create mode 100644 src/c/eval-jobs.cc

diff --git a/src/c/Makefile b/src/c/Makefile
new file mode 100644
index 00000000..dfb4e512
--- /dev/null
+++ b/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
diff --git a/src/c/eval-jobs.cc b/src/c/eval-jobs.cc
new file mode 100644
index 00000000..78298b07
--- /dev/null
+++ b/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";