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// file      : build2/install/rule.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license   : MIT; see accompanying LICENSE file

#include <build2/install/rule>

#include <butl/filesystem> // dir_exists(), file_exists()

#include <build2/scope>
#include <build2/target>
#include <build2/algorithm>
#include <build2/filesystem>
#include <build2/diagnostics>

using namespace std;
using namespace butl;

namespace build2
{
  namespace install
  {
    // Lookup the install or install.* variable. Return NULL if not found or
    // if the value is the special 'false' name (which means do not install).
    // T is either scope or target.
    //
    template <typename P, typename T>
    static const P*
    lookup_install (T& t, const string& var)
    {
      auto l (t[var]);

      if (!l)
        return nullptr;

      const P& r (cast<P> (l));
      return r.simple () && r.string () == "false" ? nullptr : &r;
    }

    // alias_rule
    //
    match_result alias_rule::
    match (action, target&, const string&) const
    {
      return true;
    }

    recipe alias_rule::
    apply (action a, target& t) const
    {
      tracer trace ("install::alias_rule::apply");

      for (prerequisite p: group_prerequisites (t))
      {
        target& pt (search (p));

        // Check if this prerequisite is explicitly "not installable",
        // that is, there is the 'install' variable and its value is
        // false.
        //
        // At first, this might seem redundand since we could have let
        // the file_rule below take care of it. The nuance is this: this
        // prerequsite can be in a different subproject that hasn't loaded
        // the install module (and therefore has no file_rule registered).
        // The typical example would be the 'tests' subproject.
        //
        // Note: not the same as lookup() above.
        //
        auto l (pt["install"]);

        if (l && cast<path> (l).string () == "false")
        {
          l5 ([&]{trace << "ignoring " << pt;});
          continue;
        }

        build2::match (a, pt);
        t.prerequisite_targets.push_back (&pt);
      }

      return default_recipe;
    }

    // file_rule
    //
    struct match_data
    {
      bool install;
    };

    static_assert (sizeof (match_data) <= target::data_size,
                   "insufficient space");

    match_result file_rule::
    match (action a, target& t, const string&) const
    {
      // First determine if this target should be installed (called
      // "installable" for short).
      //
      match_data md {lookup_install<path> (t, "install") != nullptr};
      match_result mr (true);

      if (a.operation () == update_id)
      {
        // If this is the update pre-operation and the target is installable,
        // change the recipe action to (update, 0) (i.e., "unconditional
        // update") so that we don't get matched for its prerequisites.
        //
        if (md.install)
          mr.recipe_action = action (a.meta_operation (), update_id);
        else
          // Otherwise, signal that we don't match so that some other rule can
          // take care of it.
          //
          return false;
      }

      t.data (md); // Save the data in the target's auxilary storage.
      return mr;
    }

    target* file_rule::
    filter (action, target& t, prerequisite_member p) const
    {
      target& pt (p.search ());
      return pt.in (t.root_scope ()) ? &pt : nullptr;
    }

    recipe file_rule::
    apply (action a, target& t) const
    {
      match_data md (move (t.data<match_data> ()));
      t.clear_data (); // In case delegated-to rule also uses aux storage.

      if (!md.install) // Not installable.
        return noop_recipe;

      // Ok, if we are here, then this means:
      //
      // 1. This target is installable.
      // 2. The action is either
      //    a. (perform, [un]install, 0) or
      //    b. (*, update, [un]install)
      //
      // In both cases, the next step is to search, match, and collect all the
      // installable prerequisites.
      //
      // @@ Perhaps if [noinstall] will be handled by the
      // group_prerequisite_members machinery, then we can just
      // run standard search_and_match()? Will need an indicator
      // that it was forced (e.g., [install]) for filter() below.
      //
      auto r (group_prerequisite_members (a, t));
      for (auto i (r.begin ()); i != r.end (); ++i)
      {
        prerequisite_member p (*i);

        // Ignore unresolved targets that are imported from other projects.
        // We are definitely not installing those.
        //
        if (p.proj () != nullptr)
          continue;

        // Let a customized rule have its say.
        //
        target* pt (filter (a, t, p));
        if (pt == nullptr)
          continue;

        // See if we were explicitly instructed not to touch this target.
        //
        auto l ((*pt)["install"]);
        if (l && cast<path> (l).string () == "false")
          continue;

        build2::match (a, *pt);

        // If the matched rule returned noop_recipe, then the target
        // state will be set to unchanged as an optimization. Use this
        // knowledge to optimize things on our side as well since this
        // will help a lot in case of any static installable content
        // (headers, documentation, etc).
        //
        if (pt->state () != target_state::unchanged)
          t.prerequisite_targets.push_back (pt);
        else
          unmatch (a, *pt); // No intent to execute.

        // Skip members of ad hoc groups. We handle them explicitly below.
        //
        if (pt->adhoc_group ())
          i.leave_group ();
      }

      // This is where we diverge depending on the operation. In the
      // update pre-operation, we need to make sure that this target
      // as well as all its installable prerequisites are up to date.
      //
      if (a.operation () == update_id)
      {
        // Save the prerequisite targets that we found since the
        // call to match_delegate() below will wipe them out.
        //
        target::prerequisite_targets_type p;

        if (!t.prerequisite_targets.empty ())
          p.swap (t.prerequisite_targets);

        // Find the "real" update rule, that is, the rule that would
        // have been found if we signalled that we do not match from
        // match() above.
        //
        recipe d (match_delegate (a, t, *this).first);

        // If we have no installable prerequisites, then simply redirect
        // to it.
        //
        if (p.empty ())
          return d;

        // Ok, the worst case scenario: we need to cause update of
        // prerequisite targets and also delegate to the real update.
        //
        return [pt = move (p), dr = move (d)]
          (action a, target& t) mutable -> target_state
        {
          // Do the target update first.
          //
          target_state r (execute_delegate (dr, a, t));

          // Swap our prerequisite targets back in and execute.
          //
          t.prerequisite_targets.swap (pt);
          r |= execute_prerequisites (a, t);
          pt.swap (t.prerequisite_targets); // In case we get re-executed.

          return r;
        };
      }
      else if (a.operation () == install_id)
        return [this] (action a, target& t) {return perform_install (a, t);};
      else
        return [this] (action a, target& t) {return perform_uninstall (a, t);};
    }

    void file_rule::
    install_extra (file&, const install_dir&) const {}

    bool file_rule::
    uninstall_extra (file&, const install_dir&) const {return false;}

    struct install_dir
    {
      dir_path dir;

      // If not NULL, then point to the corresponding install.* value.
      //
      const string*  sudo     = nullptr;
      const path*    cmd      = nullptr;
      const strings* options  = nullptr;
      const string*  mode     = nullptr;
      const string*  dir_mode = nullptr;

      explicit
      install_dir (dir_path d = dir_path ()): dir (move (d)) {}

      install_dir (dir_path d, const install_dir& b)
          : dir (move (d)),
            sudo (b.sudo),
            cmd (b.cmd),
            options (b.options),
            mode (b.mode),
            dir_mode (b.dir_mode) {}
    };

    using install_dirs = vector<install_dir>;

    // Calculate a subdirectory based on l's location (*.subdirs) and if not
    // empty add it to install_dirs. Return the new last element.
    //
    static install_dir&
    resolve_subdir (install_dirs& rs, target& t, scope& s, const lookup& l)
    {
      // Find the scope from which this value came and use as a base
      // to calculate the subdirectory.
      //
      for (const scope* p (&s); p != nullptr; p = p->parent_scope ())
      {
        if (l.belongs (*p)) // Ok since no target/type in lookup.
        {
          // The target can be in out or src.
          //
          const dir_path& d (t.out_dir ().leaf (p->out_path ()));

          // Add it as another leading directory rather than modifying
          // the last one directly; somehow, it feels right.
          //
          if (!d.empty ())
            rs.emplace_back (rs.back ().dir / d, rs.back ());
          break;
        }
      }

      return rs.back ();
    }

    // Resolve installation directory name to absolute directory path. Return
    // all the super-directories leading up to the destination (last).
    //
    static install_dirs
    resolve (target& t, dir_path d, const string* var = nullptr)
    {
      install_dirs rs;

      if (d.absolute ())
        rs.emplace_back (move (d.normalize ()));
      else
      {
        // If it is relative, then the first component is treated as the