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;;;; -------------------------------------------------------------------------
;;;; Plan

(uiop/package:define-package :asdf/plan
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  ;; asdf/action below is needed for required-components, traverse-action and traverse-sub-actions
  ;; that used to live there before 3.2.0.
  (:recycle :asdf/plan :asdf/action :asdf)
  (:use :uiop/common-lisp :uiop :asdf/upgrade :asdf/session
        :asdf/component :asdf/operation :asdf/action :asdf/lisp-action
        :asdf/system :asdf/system-registry :asdf/find-component :asdf/forcing)
   #:plan #:plan-traversal #:sequential-plan #:*plan-class*
   #:action-status #:status-stamp #:status-index #:status-done-p #:status-keep-p #:status-need-p
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   #:+status-good+ #:+status-todo+ #:+status-void+
   #:system-out-of-date #:action-up-to-date-p
   #:circular-dependency #:circular-dependency-actions
   #:map-direct-dependencies #:reduce-direct-dependencies #:direct-dependencies
   #:compute-action-stamp #:traverse-action #:record-dependency
   #:make-plan #:plan-actions #:plan-actions-r #:perform-plan #:mark-as-done
   #:required-components #:filtered-sequential-plan
   #:plan-component-type #:plan-keep-operation #:plan-keep-component))
(in-package :asdf/plan)

;;;; Generic plan traversal class
(with-upgradability ()
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  (defclass plan () ()
    (:documentation "Base class for a plan based on which ASDF can build a system"))
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  (defclass plan-traversal (plan)
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    (;; The forcing parameters for this plan. Also indicates whether the plan is performable,
     ;; in which case the forcing is the same as for the entire session.
     (forcing :initform (forcing (toplevel-asdf-session)) :initarg :forcing :reader forcing))
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    (:documentation "Base class for plans that simply traverse dependencies"))
  ;; Sequential plans (the default)
  (defclass sequential-plan (plan-traversal)
    ((actions-r :initform nil :accessor plan-actions-r))
    (:documentation "Simplest, default plan class, accumulating a sequence of actions"))

  (defgeneric plan-actions (plan)
    (:documentation "Extract from a plan a list of actions to perform in sequence"))
  (defmethod plan-actions ((plan list))
  (defmethod plan-actions ((plan sequential-plan))
    (reverse (plan-actions-r plan)))

  (defgeneric record-dependency (plan operation component)
    (:documentation "Record an action as a dependency in the current plan"))

  ;; No need to record a dependency to build a full graph, just accumulate nodes in order.
  (defmethod record-dependency ((plan sequential-plan) (o operation) (c component))

(when-upgrading (:version "3.3.0")
  (defmethod initialize-instance :after ((plan plan-traversal) &key &allow-other-keys)))
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;;;; Planned action status
(with-upgradability ()
  (defclass action-status ()
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      :type fixnum :initarg :bits :reader status-bits
      :documentation "bitmap describing the status of the action.")
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      :type (or integer boolean) :initarg :stamp :reader status-stamp
      :documentation "STAMP associated with the ACTION if it has been completed already in some
previous session or image, T if it was done and builtin the image, or NIL if it needs to be done.")
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      :type fixnum :initarg :level :initform 0 :reader status-level
      :documentation "the highest (operate-level) at which the action was needed")
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      :type (or integer null) :initarg :index :initform nil :reader status-index
      :documentation "INDEX associated with the ACTION in the current session,
or NIL if no the status is considered outside of a specific plan."))
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    (:documentation "Status of an action in a plan"))

  ;; STAMP   KEEP-P DONE-P NEED-P     symbol bitmap  previously   currently
  ;; not-nil   T      T      T     =>  GOOD     7    up-to-date   done (e.g. file previously loaded)
  ;; not-nil   T      T     NIL    =>  HERE     6    up-to-date   unplanned yet done
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  ;; not-nil   T     NIL     T     =>  REDO     5    up-to-date   planned (e.g. file to load)
  ;; not-nil   T     NIL    NIL    =>  SKIP     4    up-to-date   unplanned (e.g. file compiled)
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  ;; not-nil  NIL     T      T     =>  DONE     3    out-of-date  done
  ;; not-nil  NIL     T     NIL    =>  WHAT     2    out-of-date  unplanned yet done(?)
  ;;  NIL     NIL    NIL     T     =>  TODO     1    out-of-date  planned
  ;;  NIL     NIL    NIL    NIL    =>  VOID     0    out-of-date  unplanned
  ;; Note that a VOID status cannot happen as part of a transitive dependency of a wanted node
  ;; while traversing a node with TRAVERSE-ACTION; it can only happen while checking whether an
  ;; action is up-to-date with ACTION-UP-TO-DATE-P.
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  ;; When calling TRAVERSE-ACTION, the +need-bit+ is set,
  ;; unless the action is up-to-date and not needed-in-image (HERE, SKIP).
  ;; When PERFORMing an action, the +done-bit+ is set.
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  ;; When the +need-bit+ is set but not the +done-bit+, the level slot indicates which level of
  ;; OPERATE it was last marked needed for; if it happens to be needed at a higher-level, then
  ;; its urgency (and that of its transitive dependencies) must be escalated so that it will be
  ;; done before the end of this level of operate.
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  ;; Also, when no ACTION-STATUS is associated to an action yet, NIL serves as a bottom value.
  (defparameter +keep-bit+ 4)
  (defparameter +done-bit+ 2)
  (defparameter +need-bit+ 1)
  (defparameter +good-bits+ 7)
  (defparameter +todo-bits+ 1)
  (defparameter +void-bits+ 0)

  (defparameter +status-good+
    (make-instance 'action-status :bits +good-bits+ :stamp t))
  (defparameter +status-todo+
    (make-instance 'action-status :bits +todo-bits+ :stamp nil))
  (defparameter +status-void+
    (make-instance 'action-status :bits +void-bits+ :stamp nil)))

(with-upgradability ()
  (defun make-action-status (&key bits stamp (level 0) index)
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    (check-type bits (integer 0 7))
    (check-type stamp (or integer boolean))
    (check-type level (integer 0 #.most-positive-fixnum))
    (check-type index (or integer null))
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    (assert (eq (null stamp) (zerop (logand bits #.(logior +keep-bit+ +done-bit+)))) ()
            "Bad action-status :bits ~S :stamp ~S" bits stamp)
    (block nil
      (when (and (null index) (zerop level))
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        (case bits
          (#.+void-bits+ (return +status-void+))
          (#.+todo-bits+ (return +status-todo+))
          (#.+good-bits+ (when (eq stamp t) (return +status-good+)))))
      (make-instance 'action-status :bits bits :stamp stamp :level level :index index)))
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  (defun status-keep-p (status)
    (plusp (logand (status-bits status) #.+keep-bit+)))
  (defun status-done-p (status)
    (plusp (logand (status-bits status) #.+done-bit+)))
  (defun status-need-p (status)
    (plusp (logand (status-bits status) #.+need-bit+)))

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  (defun merge-action-status (status1 status2) ;; status-and
    "Return the earliest status later than both status1 and status2"
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     :bits (logand (status-bits status1) (status-bits status2))
     :stamp (latest-timestamp (status-stamp status1) (status-stamp status2))
     :level (min (status-level status1) (status-level status2))
     :index (or (status-index status1) (status-index status2))))

  (defun mark-status-needed (status &optional (level (operate-level))) ;; limited status-or
    "Return the same status but with the need bit set, for the given level"
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    (if (and (status-need-p status)
             (>= (status-level status) level))
         :bits (logior (status-bits status) +need-bit+)
         :level (max level (status-level status))
         :stamp (status-stamp status)
         :index (status-index status))))

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  (defmethod print-object ((status action-status) stream)
    (print-unreadable-object (status stream :type t)
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      (with-slots (bits stamp level index) status
        (format stream "~{~S~^ ~}" `(:bits ,bits :stamp ,stamp :level ,level :index ,index)))))

  (defgeneric action-status (plan operation component)
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    (:documentation "Returns the ACTION-STATUS associated to the action of OPERATION on COMPONENT
in the PLAN, or NIL if the action wasn't visited yet as part of the PLAN."))

  (defgeneric (setf action-status) (new-status plan operation component)
    (:documentation "Sets the ACTION-STATUS associated to
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the action of OPERATION on COMPONENT in the PLAN"))

  (defmethod action-status ((plan null) (o operation) (c component))
    (multiple-value-bind (stamp done-p) (component-operation-time o c)
      (if done-p
          (make-action-status :bits #.+keep-bit+ :stamp stamp)

  (defmethod (setf action-status) (new-status (plan null) (o operation) (c component))
    (let ((times (component-operation-times c)))
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      (if (status-done-p new-status)
          (setf (gethash o times) (status-stamp new-status))
          (remhash o times)))
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  ;; Handle FORCED-NOT: it makes an action return its current timestamp as status
  (defmethod action-status ((p plan) (o operation) (c component))
    ;; TODO: should we instead test something like:
    ;; (action-forced-not-p plan operation (primary-system component))
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    (or (gethash (make-action o c) (visited-actions *asdf-session*))
        (when (action-forced-not-p (forcing p) o c)
          (let ((status (action-status nil o c)))
            (setf (gethash (make-action o c) (visited-actions *asdf-session*))
                   :bits +good-bits+
                   :stamp (or (and status (status-stamp status)) t)
                   :index (incf (total-action-count *asdf-session*))))))))
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  (defmethod (setf action-status) (new-status (p plan) (o operation) (c component))
    (setf (gethash (make-action o c) (visited-actions *asdf-session*)) new-status))

  (defmethod (setf action-status) :after
      (new-status (p sequential-plan) (o operation) (c component))
    (unless (status-done-p new-status)
      (push (make-action o c) (plan-actions-r p)))))


;;;; Is the action needed in this image?
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(with-upgradability ()
  (defgeneric needed-in-image-p (operation component)
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    (:documentation "Is the action of OPERATION on COMPONENT needed in the current image
to be meaningful, or could it just as well have been done in another Lisp image?"))

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  (defmethod needed-in-image-p ((o operation) (c component))
    ;; We presume that actions that modify the filesystem don't need be run
    ;; in the current image if they have already been done in another,
    ;; and can be run in another process (e.g. a fork),
    ;; whereas those that don't are meant to side-effect the current image and can't.
    (not (output-files o c))))
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;;;; Visiting dependencies of an action and computing action stamps
(with-upgradability ()
  (defun* (map-direct-dependencies) (operation component fun)
    "Call FUN on all the valid dependencies of the given action in the given plan"
    (loop* :for (dep-o-spec . dep-c-specs) :in (component-depends-on operation component)
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      :for dep-o = (find-operation operation dep-o-spec)
      :when dep-o
      :do (loop :for dep-c-spec :in dep-c-specs
            :for dep-c = (and dep-c-spec (resolve-dependency-spec component dep-c-spec))
            :when (action-valid-p dep-o dep-c)
            :do (funcall fun dep-o dep-c))))

  (defun* (reduce-direct-dependencies) (operation component combinator seed)
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    "Reduce the direct dependencies to a value computed by iteratively calling COMBINATOR
for each dependency action on the dependency's operation and component and an accumulator
initialized with SEED."
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     operation component
     #'(lambda (dep-o dep-c) (setf seed (funcall combinator dep-o dep-c seed))))
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  (defun* (direct-dependencies) (operation component)
    "Compute a list of the direct dependencies of the action within the plan"
    (reverse (reduce-direct-dependencies operation component #'acons nil)))

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  ;; In a distant future, get-file-stamp, component-operation-time and latest-stamp
  ;; shall also be parametrized by the plan, or by a second model object,
  ;; so they need not refer to the state of the filesystem,
  ;; and the stamps could be cryptographic checksums rather than timestamps.
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  ;; Such a change remarkably would only affect COMPUTE-ACTION-STAMP.
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  (define-condition dependency-not-done (warning)
      :initarg :op)
      :initarg :component)
      :initarg :dep-op)
      :initarg :dep-component)
      :initarg :plan
      :initform nil))
    (:report (lambda (condition stream)
               (with-slots (op component dep-op dep-component plan) condition
                 (format stream "Computing just-done stamp ~@[in plan ~S~] for action ~S, but dependency ~S wasn't done yet!"
                         (action-path (make-action op component))
                         (action-path (make-action dep-op dep-component)))))))
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  (defmethod compute-action-stamp (plan (o operation) (c component) &key just-done)
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    ;; Given an action, figure out at what time in the past it has been done,
    ;; or if it has just been done, return the time that it has.
    ;; Returns two values:
    ;; 1- the TIMESTAMP of the action if it has already been done and is up to date,
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    ;;   or NIL is either hasn't been done or is out of date.
    ;;   (An ASDF extension could use a cryptographic digest instead.)
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    ;; 2- the DONE-IN-IMAGE-P boolean flag that is T if the action has already been done
    ;;   in the current image, or NIL if it hasn't.
    ;; Note that if e.g. LOAD-OP only depends on up-to-date files, but
    ;; hasn't been done in the current image yet, then it can have a non-NIL timestamp,
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    ;; yet a NIL done-in-image-p flag: we can predict what timestamp it will have once loaded,
    ;; i.e. that of the input-files.
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    ;; If just-done is NIL, these values return are the notional fields of
    ;; a KEEP, REDO or TODO status (VOID is possible, but probably an error).
    ;; If just-done is T, they are the notional fields of DONE status
    ;; (or, if something went wrong, TODO).
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     (block ())
     (let* ((dep-status ; collect timestamp from dependencies (or T if forced or out-of-date)
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              o c
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              #'(lambda (do dc status)
                  ;; out-of-date dependency: don't bother looking further
                  (let ((action-status (action-status plan do dc)))
                      ((and action-status (or (status-keep-p action-status)
                                              (and just-done (status-stamp action-status))))
                       (merge-action-status action-status status))
                       ;; It's OK to lose some ASDF action stamps during self-upgrade
                       (unless (equal "asdf" (primary-system-name dc))
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                         (warn 'dependency-not-done
                               :plan plan
                               :op o :component c
                               :dep-op do :dep-component dc))
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                       (return (values nil nil))))))
            (dep-stamp (status-stamp dep-status))))
     (let* (;; collect timestamps from inputs, and exit early if any is missing
            (in-files (input-files o c))
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            (in-stamps (mapcar #'get-file-stamp in-files))
            (missing-in (loop :for f :in in-files :for s :in in-stamps :unless s :collect f))
            (latest-in (timestamps-latest (cons dep-stamp in-stamps))))
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       (when (and missing-in (not just-done)) (return (values nil nil))))
     (let* (;; collect timestamps from outputs, and exit early if any is missing
            (out-files (remove-if 'null (output-files o c)))
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            (out-stamps (mapcar (if just-done 'register-file-stamp 'get-file-stamp) out-files))
            (missing-out (loop :for f :in out-files :for s :in out-stamps :unless s :collect f))
            (earliest-out (timestamps-earliest out-stamps)))
       (when (and missing-out (not just-done)) (return (values nil nil))))
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     (let (;; Time stamps from the files at hand, and whether any is missing
           (all-present (not (or missing-in missing-out)))
           ;; Has any input changed since we last generated the files?
           ;; Note that we use timestamp<= instead of timestamp< to play nice with generated files.
           ;; Any race condition is intrinsic to the limited timestamp resolution.
           (up-to-date-p (timestamp<= latest-in earliest-out))
           ;; If everything is up to date, the latest of inputs and outputs is our stamp
           (done-stamp (timestamps-latest (cons latest-in out-stamps))))
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       ;; Warn if some files are missing:
       ;; either our model is wrong or some other process is messing with our files.
       (when (and just-done (not all-present))
         ;; Shouldn't that be an error instead?
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         (warn "~A completed without ~:[~*~;~*its input file~:p~2:*~{ ~S~}~*~]~
                ~:[~; or ~]~:[~*~;~*its output file~:p~2:*~{ ~S~}~*~]"
               (action-description o c)
               missing-in (length missing-in) (and missing-in missing-out)
               missing-out (length missing-out))))
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     (let (;; There are three kinds of actions:
           (out-op (and out-files t)) ; those that create files on the filesystem
           ;;(image-op (and in-files (null out-files))) ; those that load stuff into the image
           ;;(null-op (and (null out-files) (null in-files))) ; placeholders that do nothing
     (if (or just-done ;; The done-stamp is valid: if we're just done, or
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             (and all-present ;; if all filesystem effects are up-to-date
                  (operation-done-p o c) ;; and there's no invalidating reason.
                  (not (action-forced-p (forcing (or plan *asdf-session*)) o c))))
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         (values done-stamp ;; return the hard-earned timestamp
                 (or just-done
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                     out-op ;; A file-creating op is done when all files are up to date.
                     ;; An image-effecting operation is done when
                     (and (status-done-p dep-status) ;; all the dependencies were done, and
                          (multiple-value-bind (perform-stamp perform-done-p)
                              (component-operation-time o c)
                            (and perform-done-p ;; the op was actually run,
                                 (equal perform-stamp done-stamp)))))) ;; with a matching stamp.
         ;; done-stamp invalid: return a timestamp in an indefinite future, action not done yet
         (values nil nil)))))
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;;;; The four different actual traversals:
;; * TRAVERSE-ACTION o c T: Ensure all dependencies are either up-to-date in-image, or planned
;; * TRAVERSE-ACTION o c NIL: Ensure all dependencies are up-to-date or planned, in-image or not
;; * ACTION-UP-TO-DATE-P: Check whether some (defsystem-depends-on ?) dependencies are up to date
;; * COLLECT-ACTION-DEPENDENCIES: Get the dependencies (filtered), don't change any status
(with-upgradability ()

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  ;; Compute the action status for a newly visited action.
  (defun compute-action-status (plan operation component need-p)
    (multiple-value-bind (stamp done-p)
        (compute-action-stamp plan operation component)
      (assert (or stamp (not done-p)))
       :bits (logior (if stamp #.+keep-bit+ 0)
                     (if done-p #.+done-bit+ 0)
                     (if need-p #.+need-bit+ 0))
       :stamp stamp
       :level (operate-level)
       :index (incf (total-action-count *asdf-session*)))))

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  ;; TRAVERSE-ACTION, in the context of a given PLAN object that accumulates dependency data,
  ;; visits the action defined by its OPERATION and COMPONENT arguments,
  ;; and all its transitive dependencies (unless already visited),
  ;; in the context of the action being (or not) NEEDED-IN-IMAGE-P,
  ;; i.e. needs to be done in the current image vs merely have been done in a previous image.
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  ;; TRAVERSE-ACTION updates the VISITED-ACTIONS entries for the action and for all its
  ;; transitive dependencies (that haven't been sufficiently visited so far).
  ;; It does not return any usable value.
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  ;; Note that for an XCVB-like plan with one-image-per-file-outputting-action,
  ;; the below method would be insufficient, since it assumes a single image
  ;; to traverse each node at most twice; non-niip actions would be traversed only once,
  ;; but niip nodes could be traversed once per image, i.e. once plus once per non-niip action.
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  (defun traverse-action (plan operation component needed-in-image-p)
    (block nil
      (unless (action-valid-p operation component) (return))
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      ;; Record the dependency. This hook is needed by POIU, which tracks a full dependency graph,
      ;; instead of just a dependency order as in vanilla ASDF.
      ;; TODO: It is also needed to detect OPERATE-in-PERFORM.
      (record-dependency plan operation component)
      (while-visiting-action (operation component) ; maintain context, handle circularity.
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        ;; needed-in-image distinguishes b/w things that must happen in the
        ;; current image and those things that simply need to have been done in a previous one.
        (let* ((aniip (needed-in-image-p operation component)) ; action-specific needed-in-image
               ;; effective niip: meaningful for the action and required by the plan as traversed
               (eniip (and aniip needed-in-image-p))
               ;; status: have we traversed that action previously, and if so what was its status?
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               (status (action-status plan operation component))
               (level (operate-level)))
          (when (and status
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                     (or (status-done-p status) ;; all done
                         (and (status-need-p status) (<= level (status-level status))) ;; already visited
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                         (and (status-keep-p status) (not eniip)))) ;; up-to-date and not eniip
            (return)) ; Already visited with sufficient need-in-image level!
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          (labels ((visit-action (niip) ; We may visit the action twice, once with niip NIL, then T
                     (map-direct-dependencies ; recursively traverse dependencies
                      operation component #'(lambda (o c) (traverse-action plan o c niip)))
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                     ;; AFTER dependencies have been traversed, compute action stamp
                     (let* ((status (if status
                                        (mark-status-needed status level)
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                                        (compute-action-status plan operation component t)))
                            (out-of-date-p (not (status-keep-p status)))
                            (to-perform-p (or out-of-date-p (and niip (not (status-done-p status))))))
                       (cond ; it needs be done if it's out of date or needed in image but absent
                         ((and out-of-date-p (not niip)) ; if we need to do it,
                          (visit-action t)) ; then we need to do it *in the (current) image*!
                          (setf (action-status plan operation component) status)
                          (when (status-done-p status)
                            (setf (component-operation-time operation component)
                                  (status-stamp status)))
                          (when to-perform-p ; if it needs to be added to the plan, count it
                            (incf (planned-action-count *asdf-session*))
                            (unless aniip ; if it's output-producing, count it
                              (incf (planned-output-action-count *asdf-session*)))))))))
            (visit-action eniip)))))) ; visit the action

  ;; NB: This is not an error, not a warning, but a normal expected condition,
  ;; to be to signaled by FIND-SYSTEM when it detects an out-of-date system,
  ;; *before* it tries to replace it with a new definition.
  (define-condition system-out-of-date (condition)
    ((name :initarg :name :reader component-name))
    (:documentation "condition signaled when a system is detected as being out of date")
    (:report (lambda (c s)
               (format s "system ~A is out of date" (component-name c)))))

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  (defun action-up-to-date-p (plan operation component)
    "Check whether an action was up-to-date at the beginning of the session.
Update the VISITED-ACTIONS table with the known status, but don't add anything to the PLAN."
    (block nil
      (unless (action-valid-p operation component) (return t))
      (while-visiting-action (operation component) ; maintain context, handle circularity.
        ;; Do NOT record the dependency: it might be out of date.
        (let ((status (or (action-status plan operation component)
                          (setf (action-status plan operation component)
                                (let ((dependencies-up-to-date-p
                                           (block nil
                                              operation component
                                              #'(lambda (o c)
                                                  (unless (action-up-to-date-p plan o c)
                                                    (return nil))))
                                         (system-out-of-date () nil))))
                                  (if dependencies-up-to-date-p
                                      (compute-action-status plan operation component nil)
          (and (status-keep-p status) (status-stamp status)))))))


;;;; Incidental traversals
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;;; Making a FILTERED-SEQUENTIAL-PLAN can be used to, e.g., all of the source
;;; files required by a bundling operation.
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(with-upgradability ()
  (defclass filtered-sequential-plan (sequential-plan)
    ((component-type :initform t :initarg :component-type :reader plan-component-type)
     (keep-operation :initform t :initarg :keep-operation :reader plan-keep-operation)
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     (keep-component :initform t :initarg :keep-component :reader plan-keep-component))
    (:documentation "A variant of SEQUENTIAL-PLAN that only records a subset of actions."))
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  (defmethod initialize-instance :after ((plan filtered-sequential-plan)
                                         &key system other-systems)
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    ;; Ignore force and force-not, rely on other-systems:
    ;; force traversal of what we're interested in, i.e. current system or also others;
    ;; force-not traversal of what we're not interested in, i.e. other systems unless other-systems.
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    (setf (slot-value plan 'forcing)
          (make-forcing :system system :force :all :force-not (if other-systems nil t))))
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  (defmethod plan-actions ((plan filtered-sequential-plan))
    (with-slots (keep-operation keep-component) plan
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      (loop :for action :in (call-next-method)
        :as o = (action-operation action)
        :as c = (action-component action)
        :when (and (typep o keep-operation) (typep c keep-component))
        :collect (make-action o c))))
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  (defun collect-action-dependencies (plan operation component)
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    (when (action-valid-p operation component)
      (while-visiting-action (operation component) ; maintain context, handle circularity.
        (let ((action (make-action operation component)))
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          (unless (nth-value 1 (gethash action (visited-actions *asdf-session*)))
            (setf (gethash action (visited-actions *asdf-session*)) nil)
            (when (and (typep component (plan-component-type plan))
                       (not (action-forced-not-p (forcing plan) operation component)))
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              (map-direct-dependencies operation component
                                       #'(lambda (o c) (collect-action-dependencies plan o c)))
              (push action (plan-actions-r plan))))))))
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  (defgeneric collect-dependencies (operation component &key &allow-other-keys)
    (:documentation "Given an action, build a plan for all of its dependencies."))
  (define-convenience-action-methods collect-dependencies (operation component &key))
  (defmethod collect-dependencies ((operation operation) (component component)
                                   &rest keys &key &allow-other-keys)
    (let ((plan (apply 'make-instance 'filtered-sequential-plan
                       :system (component-system component) keys)))
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      (loop :for action :in (direct-dependencies operation component)
        :do (collect-action-dependencies plan (action-operation action) (action-component action)))
      (plan-actions plan)))

  (defun* (required-components) (system &rest keys &key (goal-operation 'load-op) &allow-other-keys)
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    "Given a SYSTEM and a GOAL-OPERATION (default LOAD-OP), traverse the dependencies and
return a list of the components involved in building the desired action."
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    (with-asdf-session (:override t)
       (mapcar 'action-component
               (apply 'collect-dependencies goal-operation system
                      (remove-plist-key :goal-operation keys)))
       :from-end t))))

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;;;; High-level interface: make-plan, perform-plan
(with-upgradability ()
  (defgeneric make-plan (plan-class operation component &key &allow-other-keys)
    (:documentation "Generate and return a plan for performing OPERATION on COMPONENT."))
  (define-convenience-action-methods make-plan (plan-class operation component &key))

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  (defgeneric mark-as-done (plan-class operation component)
    (:documentation "Mark an action as done in a plan, after performing it."))
  (define-convenience-action-methods mark-as-done (plan-class operation component))

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  (defgeneric perform-plan (plan &key)
    (:documentation "Actually perform a plan and build the requested actions"))

  (defparameter* *plan-class* 'sequential-plan
    "The default plan class to use when building with ASDF")

  (defmethod make-plan (plan-class (o operation) (c component) &rest keys &key &allow-other-keys)
    (with-asdf-session ()
      (let ((plan (apply 'make-instance (or plan-class *plan-class*) keys)))
        (traverse-action plan o c t)

  (defmethod perform-plan :around ((plan t) &key)
    (assert (performable-p (forcing plan)) () "plan not performable")
    (let ((*package* *package*)
          (*readtable* *readtable*))
      (with-compilation-unit () ;; backward-compatibility.
        (call-next-method))))   ;; Going forward, see deferred-warning support in lisp-build.

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  (defun action-already-done-p (plan operation component)
    (if-let (status (action-status plan operation component))
      (status-done-p status)))

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  (defmethod perform-plan ((plan t) &key)
    (loop :for action :in (plan-actions plan)
      :as o = (action-operation action)
      :as c = (action-component action) :do
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      (unless (action-already-done-p plan o c)
        (perform-with-restarts o c)
        (mark-as-done plan o c))))

  (defmethod mark-as-done ((plan plan) (o operation) (c component))
    (let ((plan-status (action-status plan o c))
          (perform-status (action-status nil o c)))
      (assert (and (status-stamp perform-status) (status-keep-p perform-status)) ()
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              "Just performed ~A but failed to mark it done" (action-description o c))
      (setf (action-status plan o c)
             :bits (logior (status-bits plan-status) +done-bit+)
             :stamp (status-stamp perform-status)
             :level (status-level plan-status)
             :index (status-index plan-status))))))