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diff --git a/libbuild2/script/run.hxx b/libbuild2/script/run.hxx
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+++ b/libbuild2/script/run.hxx
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+// file      : libbuild2/script/run.hxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_SCRIPT_RUN_HXX
+#define LIBBUILD2_SCRIPT_RUN_HXX
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/script/script.hxx>
+
+namespace build2
+{
+  namespace script
+  {
+    // An exception that can be thrown by an expression running function to
+    // exit the script (for example, as a result of executing the exit builtin
+    // by the below run*() functions). The status indicates whether the
+    // execution should be considered to have succeeded or failed.
+    //
+    struct exit
+    {
+      bool status;
+
+      explicit
+      exit (bool s): status (s) {}
+    };
+
+    // Helpers.
+    //
+
+    // Command expression running functions.
+    //
+    // Index is the 1-base index of this command line in the command list.
+    // If it is 0 then it means there is only one command. This information
+    // can be used, for example, to derive file names.
+    //
+    // Location is the start position of this command line in the script. It
+    // can be used in diagnostics.
+    //
+    void
+    run (environment&, const command_expr&, size_t index, const location&);
+
+    bool
+    run_if (environment&, const command_expr&, size_t, const location&);
+
+    // Perform the registered special file cleanups in the direct order and
+    // then the regular cleanups in the reverse order.
+    //
+    void
+    clean (environment&, const location&);
+
+    // Print first 10 directory sub-entries to the diag record. The directory
+    // must exist. Is normally used while issuing diagnostics on non-empty
+    // directory removal failure.
+    //
+    void
+    print_dir (diag_record&, const dir_path&, const location&);
+
+    // Return the quoted path representation with the preserved trailing
+    // directory separator. The path is relative if the verbosity level is
+    // less than 3.
+    //
+    string
+    diag_path (const path&);
+
+    // Same as above, but prepends the path with a name, if present. The path
+    // must be not NULL.
+    //
+    string
+    diag_path (const dir_name_view&);
+  }
+}
+
+#endif // LIBBUILD2_SCRIPT_RUN_HXX