@wordpress/block-library/build-module/list-item/hooks/use-merge.mjs

Block library for the WordPress editor.

// packages/block-library/src/list-item/hooks/use-merge.js
import { useRegistry } from "@wordpress/data";
import { store as blockEditorStore } from "@wordpress/block-editor";
import { isUnmodifiedBlock, switchToBlockType } from "@wordpress/blocks";
import { outdentListItems, getOutdentTarget } from "../utils.mjs";
function useMerge(clientId, onMerge) {
  const registry = useRegistry();
  return (forward) => {
    const select = registry.select(blockEditorStore);
    const {
      getPreviousBlockClientId,
      getNextBlockClientId,
      getBlockOrder,
      getBlockIndex,
      getBlockRootClientId,
      getBlockName,
      getBlock
    } = select;
    const { mergeBlocks, moveBlocksToPosition, removeBlock, insertBlocks } = registry.dispatch(blockEditorStore);
    function getTrailingId(id) {
      const order = getBlockOrder(id);
      if (!order.length) {
        return id;
      }
      return getTrailingId(order[order.length - 1]);
    }
    function mergeWithNested(clientIdA, clientIdB) {
      registry.batch(() => {
        const [nestedListClientId] = getBlockOrder(clientIdB);
        if (nestedListClientId) {
          if (getPreviousBlockClientId(clientIdB) === clientIdA && !getBlockOrder(clientIdA).length) {
            moveBlocksToPosition(
              [nestedListClientId],
              clientIdB,
              clientIdA
            );
          } else if (getOutdentTarget(select, clientIdB) === clientIdA) {
            moveBlocksToPosition(
              getBlockOrder(nestedListClientId),
              nestedListClientId,
              getBlockRootClientId(clientIdB),
              getBlockIndex(clientIdB) + 1
            );
          } else {
            moveBlocksToPosition(
              getBlockOrder(nestedListClientId),
              nestedListClientId,
              getBlockRootClientId(clientIdA)
            );
          }
        }
        const listId = getBlockRootClientId(clientIdB);
        mergeBlocks(clientIdA, clientIdB);
        if (!getBlockOrder(listId).length) {
          removeBlock(listId, false);
        }
      });
    }
    if (forward) {
      const innerListId = getBlockOrder(clientId)[0];
      let nextBlockClientId;
      let listItemId = clientId;
      if (innerListId) {
        nextBlockClientId = getBlockOrder(innerListId)[0];
      } else {
        while (!(nextBlockClientId = getNextBlockClientId(listItemId))) {
          const parentLi = getOutdentTarget(select, listItemId);
          if (!parentLi) {
            break;
          }
          listItemId = parentLi;
        }
      }
      if (!nextBlockClientId) {
        const outerListId = getBlockRootClientId(listItemId);
        const followingBlockId = getNextBlockClientId(outerListId);
        if (followingBlockId) {
          if (getBlockName(followingBlockId) === "core/list") {
            registry.batch(() => {
              moveBlocksToPosition(
                getBlockOrder(followingBlockId),
                followingBlockId,
                outerListId
              );
              removeBlock(followingBlockId, false);
            });
          } else {
            const transformed = switchToBlockType(
              getBlock(followingBlockId),
              "core/list"
            );
            const newInnerBlocks = transformed?.[0]?.innerBlocks;
            if (newInnerBlocks?.length) {
              registry.batch(() => {
                insertBlocks(
                  newInnerBlocks,
                  void 0,
                  outerListId,
                  false
                );
                removeBlock(followingBlockId, false);
              });
            }
          }
        }
      } else {
        mergeWithNested(clientId, nextBlockClientId);
      }
    } else {
      const previousBlockClientId = getPreviousBlockClientId(clientId);
      if (previousBlockClientId) {
        const trailingId = getTrailingId(previousBlockClientId);
        mergeWithNested(trailingId, clientId);
        return;
      }
      const parentListItemId = getOutdentTarget(select, clientId);
      if (parentListItemId) {
        mergeWithNested(parentListItemId, clientId);
        return;
      }
      const blockOrder = getBlockOrder(clientId);
      if (isUnmodifiedBlock(getBlock(clientId), "content") && blockOrder.length > 0) {
        registry.batch(() => {
          outdentListItems(
            registry,
            getBlockOrder(blockOrder[0])
          );
          removeBlock(clientId, true);
        });
      } else {
        onMerge(forward);
      }
    }
  };
}
export {
  useMerge as default
};
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