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diff --git a/libbuild2/rule-adhoc-buildscript.hxx b/libbuild2/rule-adhoc-buildscript.hxx
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+// file : libbuild2/rule-adhoc-buildscript.hxx -*- C++ -*-
+// license : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_RULE_ADHOC_BUILDSCRIPT_HXX
+#define LIBBUILD2_RULE_ADHOC_BUILDSCRIPT_HXX
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/forward.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/rule.hxx>
+
+#include <libbuild2/build/script/script.hxx>
+
+namespace build2
+{
+ // Ad hoc buildscript rule.
+ //
+ // Note: not exported and should not be used directly (i.e., registered).
+ //
+ class adhoc_buildscript_rule: public adhoc_rule
+ {
+ public:
+ virtual bool
+ match (action, target&, const string&, optional<action>) const override;
+
+ virtual recipe
+ apply (action, target&) const override;
+
+ target_state
+ perform_update_file (action, const target&) const;
+
+ target_state
+ default_action (action, const target&) const;
+
+ adhoc_buildscript_rule (const location& l, size_t b)
+ : adhoc_rule ("<ad hoc buildscript recipe>", l, b) {}
+
+ virtual bool
+ recipe_text (context&, const target&, string&&, attributes&) override;
+
+ virtual void
+ dump_attributes (ostream&) const override;
+
+ virtual void
+ dump_text (ostream&, string&) const override;
+
+ public:
+ using script_type = build::script::script;
+
+ script_type script;
+ string checksum; // Script text hash.
+ };
+}
+
+#endif // LIBBUILD2_RULE_ADHOC_BUILDSCRIPT_HXX