Changelog

Version: 2.0.15
Date: 2026-09-08
  Bugfixes:
    - Stop paving ground a pipe can sit on. A connector on ordinary buildable ground
      no longer gets a cover tile laid under it, and is no longer downgraded to a
      ghost, just because a cover tile is on record for that ground
    - Connect on modded ground that names a default cover tile, such as Moshine dry
      swamp, instead of placing nothing at all
    - Refuse a cover tile that could never be laid down, rather than crashing on it.
      Warptorio names empty-space as the cover for every tile it makes destructible,
      and asking the game for a ghost of that is an error, not an answer
    - Stop laying a paving tile where the game would never let you build one. A
      connector over ground that needs covering now uses a tile that is actually
      allowed there, or leaves the gap alone, instead of ordering a tile ghost that
      can never be finished and a pipe ghost stuck waiting behind it

Version: 2.0.14
Date: 2026-09-05
  Changes:
    - Move the tile, cover, undo and neighbor logic into lib/ modules
    - Add unit tests, and integration tests that drive a real Factorio
    - Add a walkthrough mode that steps through the integration fixtures in a live game
  Bugfixes:
    - Connectors placed in editor mode no longer consume items, since building is free there

Version: 2.0.13
Date: 2026-09-05
  Changes:
    - Add a luacheck config, with Factorio's globals taken from the FMTK library

Version: 2.0.12
Date: 2026-09-05
  Features:
    - Cover meltable ground under an automatic connector, with a tile or a ghost
  Bugfixes:
    - Connector next to a ghost underground was placed as a real pipe for free

Version: 2.0.11
Date: 2025-06-11
  Changes:
    - Revert to 2.0.3 entity creation strategy. Break Aquilo tile placement again.

Version: 2.0.10
Date: 2025-06-11
  Bugfixes:
    - Underground was re-placed as ghost when pipe missing from inventory
    - Error on placement of non-unit entity

Version: 2.0.9
Date: 2025-06-06
  Bugfixes:
    - Underground dragging immediately placed unnecessary underground after pipe placement
    - Ghost undergrounds connected to ghost buildings in the same blueprint

Version: 2.0.8
Date: 2025-05-31
  Bugfixes:
    - Crash error caused by previous fix to hand icon, now broken again temporarily

Version: 2.0.7
Date: 2025-05-31
  Bugfixes:
    - Error due to new underground entity invalidated mid-tick

Version: 2.0.6
Date: 2025-05-30
  Changes:
    - No connections between any undergrounds created in the same tick, not just for blueprints
  Bugfixes:
    - Reserved inventory slot (hand icon) was lost for blueprint/pipe when mod triggered
    - Pipes no longer fast replace valves or other pipe-like entities
    - Pipes with weird connection offsets now connect correctly
    - First underground of multiple created in a tick no longer ignored

Version: 2.0.5
Date: 2025-05-29
  Bugfixes:
    - Error due to new underground entity invalidated mid-tick

Version: 2.0.4
Date: 2025-05-28
  Features:
    - Remote interface for reading, updating, replacing the underground to pipe lookup table
  Changes:
    - Refactor API usage to use build_from_cursor and support ice-platform
  Bugfixes:
    - Temporary blueprints dropped to inventory
    - Undergrounds in blueprints creating pipes prematurely
    - Ghost pipes counting as automatic connection targets

Version: 2.0.3
Date: 2025-05-24
  Bugfixes:
    - Fixed undo/redo not working

Version: 2.0.2
Date: 2024-11-02
  Bugfixes:
    - Another crash on missing player inventory

Version: 2.0.1
Date: 2024-11-01
  Features:
    - Place tile ghost to support automatic connector over water, space, lava, etc
  Bugfixes:
    - Crash on missing player inventory

Version: 2.0.0
Date: 2024-10-23
  Features:
    - Recognizes dynamic fluid inputs, such as on Assemblers
  Changes:
    - Support for Factorio 2.0

Version: 1.2.0
Date: 2024-09-14
  Features:
    - Support non-pipe ghosts with fluidboxes as connectable neighbors
  Changes:
    - Replace custom vector lookup with util.direction_vectors
    - Add LuaLS annotations to source for all types and functions
    - Improve source comments
    - Improve source naming

Version: 1.1.3
Date: 2023-12-09
  Bugfixes:
    - Crash with mods that add underground pipe recipes with fluid ingredients

Version: 1.1.2
Date: 2023-12-09
  Bugfixes:
    - Crash with mods that add underground pipe recipes with byproducts

Version: 1.1.1
Date: 2023-11-02
  Bugfixes:
    - Crash when checking invalid fluid-turret fluidbox

Version: 1.1.0
Date: 2023-06-18
  Features:
    - Replace ghost pipes
    - Place ghost pipes when placing ghost underground pipes
    - Place ghosts/pipes when placing near non-pipe entities with fluid connections

Version: 1.0.4
Date: 2021-12-28
  Changes:
    - Version bump for Factorio 1.1

Version: 1.0.3
Date: 2021-12-28
  Bugfixes:
    - Avoid errors on unrecognized pipes
    - Avoid replacing fast-replace-able entities like other pipes

Version: 1.0.2
Date: 2020-09-07
  Features:
    - Prevent mixing fluids

Version: 1.0.1
Date: 2020-09-06
  Features:
    - Automatically place a pipe when two undergrounds are placed at a corner or one space apart
  Other:
    - First version!