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+(ns logseq.graph-parser.db-pipeline
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+ "This ns provides a datascript listener for DB graphs to add additional changes
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+ that the frontend also adds per transact.
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+ Known limitations:
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+ * Deleted blocks don't update effected :block/tx-id"
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+ (:require [datascript.core :as d]
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+ [clojure.set :as set]
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+ [logseq.db :as ldb]
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+ [logseq.graph-parser.datascript-report :as ds-report]))
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+
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+(defn filter-deleted-blocks
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+ [datoms]
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+ (keep
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+ (fn [d]
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+ (when (and (= :block/uuid (:a d)) (false? (:added d)))
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+ (:v d)))
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+ datoms))
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+
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+;; TODO: it'll be great if we can calculate the :block/path-refs before any
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+;; outliner transaction, this way we can group together the real outliner tx
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+;; and the new path-refs changes, which makes both undo/redo and
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+;; react-query/refresh! easier.
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+
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+;; TODO: also need to consider whiteboard transactions
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+
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+;; Steps:
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+;; 1. For each changed block, new-refs = its page + :block/refs + parents :block/refs
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+;; 2. Its children' block/path-refs might need to be updated too.
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+(defn- compute-block-path-refs
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+ [{:keys [db-before db-after]} blocks*]
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+ (let [blocks (remove :block/name blocks*)
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+ *computed-ids (atom #{})]
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+ (mapcat (fn [block]
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+ (when (and (not (@*computed-ids (:block/uuid block))) ; not computed yet
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+ (not (:block/name block)))
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+ (let [parents (ldb/get-block-parents db-after (:block/uuid block) {})
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+ parents-refs (->> (mapcat :block/path-refs parents)
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+ (map :db/id))
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+ old-refs (if db-before
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+ (set (map :db/id (:block/path-refs (d/entity db-before (:db/id block)))))
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+ #{})
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+ new-refs (set (concat
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+ (some-> (:db/id (:block/page block)) vector)
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+ (map :db/id (:block/refs block))
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+ parents-refs))
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+ refs-changed? (not= old-refs new-refs)
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+ children (ldb/get-block-children-ids db-after (:block/uuid block))
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+ ;; Builds map of children ids to their parent id and :block/refs ids
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+ children-maps (into {}
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+ (map (fn [id]
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+ (let [entity (d/entity db-after [:block/uuid id])]
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+ [(:db/id entity)
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+ {:parent-id (get-in entity [:block/parent :db/id])
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+ :block-ref-ids (map :db/id (:block/refs entity))}]))
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+ children))
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+ children-refs (map (fn [[id {:keys [block-ref-ids] :as child-map}]]
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+ {:db/id id
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+ ;; Recalculate :block/path-refs as db contains stale data for this attribute
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+ :block/path-refs
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+ (set/union
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+ ;; Refs from top-level parent
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+ new-refs
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+ ;; Refs from current block
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+ block-ref-ids
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+ ;; Refs from parents in between top-level
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+ ;; parent and current block
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+ (loop [parent-refs #{}
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+ parent-id (:parent-id child-map)]
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+ (if-let [parent (children-maps parent-id)]
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+ (recur (into parent-refs (:block-ref-ids parent))
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+ (:parent-id parent))
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+ ;; exits when top-level parent is reached
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+ parent-refs)))})
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+ children-maps)]
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+ (swap! *computed-ids set/union (set (cons (:block/uuid block) children)))
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+ (concat
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+ (when (and (seq new-refs) refs-changed?)
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+ [{:db/id (:db/id block)
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+ :block/path-refs new-refs}])
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+ children-refs))))
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+ blocks)))
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+
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+(defn compute-block-path-refs-tx
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+ [tx-report blocks]
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+ (let [refs-tx (compute-block-path-refs tx-report blocks)
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+ truncate-refs-tx (map (fn [m] [:db/retract (:db/id m) :block/path-refs]) refs-tx)]
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+ (concat truncate-refs-tx refs-tx)))
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+
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+(defn- invoke-hooks
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+ "Modified copy of frontend.modules.outliner.pipeline/invoke-hooks that doesn't
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+ handle :block/tx-id"
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+ [conn tx-report]
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+ (when (not (get-in tx-report [:tx-meta :pipeline-replace?]))
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+ (let [{:keys [blocks]} (ds-report/get-blocks-and-pages tx-report)
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+ block-path-refs-tx (compute-block-path-refs-tx tx-report blocks)]
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+ (d/transact! conn block-path-refs-tx {:pipeline-replace? true}))))
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+
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+(defn add-listener
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+ "Adds a listener to the datascript connection to add additional changes from outliner.pipeline"
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+ [conn]
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+ (d/listen! conn :pipeline-updates (fn pipeline-updates [tx-report]
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+ (invoke-hooks conn tx-report))))
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