Move bash build system module to separate library

1 files changed, 91 insertions, 0 deletions

diff --git a/libbuild2/bash/rule.hxx b/libbuild2/bash/rule.hxx
new file mode 100644
index 0000000..665a6c2
--- /dev/null
+++ b/libbuild2/bash/rule.hxx
@@ -0,0 +1,91 @@
+// file      : libbuild2/bash/rule.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_BASH_RULE_HXX
+#define LIBBUILD2_BASH_RULE_HXX
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/install/rule.hxx>
+
+#include <libbuild2/in/rule.hxx>
+
+#include <libbuild2/bash/export.hxx>
+
+namespace build2
+{
+  namespace bash
+  {
+    // Preprocess a bash script (exe{}) or module (bash{}) .in file that
+    // imports one or more bash modules.
+    //
+    // Note that the default substitution symbol is '@' and the mode is lax
+    // (think bash arrays). The idea is that '@' is normally used in ways that
+    // are highly unlikely to be misinterpreted as substitutions. The user,
+    // however, is still able to override both of these choices with the
+    // corresponding in.* variables (e.g., to use '`' and strict mode).
+    //
+    class LIBBUILD2_BASH_SYMEXPORT in_rule: public in::rule
+    {
+    public:
+      in_rule (): rule ("bash.in 1", "bash.in", '@', false /* strict */) {}
+
+      virtual bool
+      match (action, target&, const string&) const override;
+
+      virtual recipe
+      apply (action, target&) const override;
+
+      virtual target_state
+      perform_update (action, const target&) const override;
+
+      virtual prerequisite_target
+      search (action,
+              const target&,
+              const prerequisite_member&,
+              include_type) const override;
+
+      virtual optional<string>
+      substitute (const location&,
+                  action a,
+                  const target&,
+                  const string&,
+                  bool) const override;
+
+      string
+      substitute_import (const location&,
+                         action a,
+                         const target&,
+                         const string&) const;
+    };
+
+    // Installation rule for bash scripts (exe{}) and modules (bash{}). Here
+    // we do:
+    //
+    // 1. Signal to in_rule that this is update for install.
+    //
+    // 2. Custom filtering of prerequisites.
+    //
+    class LIBBUILD2_BASH_SYMEXPORT install_rule: public install::file_rule
+    {
+    public:
+      install_rule (const in_rule& in): in_ (in) {}
+
+      virtual bool
+      match (action, target&, const string&) const override;
+
+      virtual recipe
+      apply (action, target&) const override;
+
+      virtual const target*
+      filter (action, const target&, const prerequisite&) const override;
+
+    protected:
+      const in_rule& in_;
+    };
+  }
+}
+
+#endif // LIBBUILD2_BASH_RULE_HXX