* Clean up the imploded parse tree. Quotes around strings are

removed, paths are absolutised relative to the path containing the
  expression we just parsed, and integer literals are converted to
  actual integers.

src/fix-ng/Makefile.am

@@ -1,6 +1,6 @@
 bin_PROGRAMS = fix-ng
 
-fix_ng_SOURCES = fix.cc parser.cc
+fix_ng_SOURCES = fix-expr.cc parser.cc fix.cc
 fix_ng_LDADD = ../libmain/libmain.a ../libnix/libnix.a ../boost/format/libformat.a \
  -L../../externals/inst/lib -ldb_cxx -lsglr -lATB -lconversion -lasfix2 -lmept -lATerm
 

src/fix-ng/fix-expr.cc

@@ -29,5 +29,5 @@ ATerm bottomupRewrite(TermFun & f, ATerm e)
         return (ATerm) ATreverse(out);
     }
 
-    throw badTerm("cannot rewrite", e);
+    return e;
 }

src/fix-ng/parser.cc

@@ -1,3 +1,9 @@
+#include <sstream>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
 extern "C" {
 #include <sglr.h>
 #include <asfix2.h>
@@ -5,15 +11,58 @@ extern "C" {
 
 #include "parser.hh"
 #include "shared.hh"
+#include "fix-expr.hh"
 #include "expr.hh"
 #include "parse-table.h"
 
 
-Expr parseExprFromFile(const Path & path)
+struct Cleanup : TermFun
 {
+    string basePath;
+
+    virtual ATerm operator () (ATerm e)
+    {
+        char * s;
+
+        if (ATmatch(e, "Str(<str>)", &s)) {
+            string s2(s);
+            return ATmake("Str(<str>)",
+                string(s2, 1, s2.size() - 2).c_str());
+        }
+
+        if (ATmatch(e, "Path(<str>)", &s)) {
+            string path(s);
+            if (path[0] != '/')
+                path = basePath + "/" + path;
+            return ATmake("Str(<str>)", canonPath(path).c_str());
+        }
+
+        if (ATmatch(e, "Int(<str>)", &s)) {
+            istringstream s2(s);
+            int n;
+            s2 >> n;
+            return ATmake("Int(<int>)", n);
+        }
+
+        return e;
+    }
+};
+
+
+Expr parseExprFromFile(Path path)
+{
+#if 0
     /* Perhaps this is already an imploded parse tree? */
     Expr e = ATreadFromNamedFile(path.c_str());
     if (e) return e;
+#endif
+
+    /* If `path' refers to a directory, append `/default.fix'. */
+    struct stat st;
+    if (stat(path.c_str(), &st))
+        throw SysError(format("getting status of `%1%'") % path);
+    if (S_ISDIR(st.st_mode))
+        path = canonPath(path + "/default.fix");
 
     /* Initialise the SDF libraries. */
     static bool initialised = false;
@@ -72,5 +121,7 @@ Expr parseExprFromFile(const Path & path)
     if (!imploded)
         throw Error(format("cannot implode parse tree"));
 
-    return imploded;
+    Cleanup cleanup;
+    cleanup.basePath = dirOf(path);
+    return bottomupRewrite(cleanup, imploded);
 }

src/fix-ng/parser.hh

@@ -1,15 +1,10 @@
 #ifndef __PARSER_H
 #define __PARSER_H
 
-#include <string>
-#include <aterm2.h>
-
-#include "util.hh"
+#include "fix-expr.hh"
 
 
-typedef ATerm Expr;
-
-Expr parseExprFromFile(const Path & path);
+Expr parseExprFromFile(Path path);
 
 
 #endif /* !__PARSER_H */