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QMK Breaking Change - 2019 Aug 30 ​

Four times a year QMK runs a process for merging Breaking Changes. A Breaking Change is any change which modifies how QMK behaves in a way that is incompatible or potentially dangerous. We limit these changes to 4 times per year so that users can have confidence that updating their QMK tree will not break their keymaps.

This document marks the inaugural Breaking Change merge. A list of changes follows.

Core code formatting with clang-format ​

  • All core files (drivers/, quantum/, tests/, and tmk_core/) have been formatted with clang-format
  • A travis process to reformat PRs on merge has been instituted
  • You can use the new CLI command qmk cformat to format before submitting your PR if you wish.

LUFA USB descriptor cleanup ​

  • Some code cleanups related to the USB HID descriptors on AVR keyboards, to make them easier to read and understand
  • More information: see https://github.com/qmk/qmk_firmware/pull/4871
  • No behaviour changes anticipated and no keymaps modified

Migrating ACTION_LAYER_MOMENTARY() entries in fn_actions to MO() keycodes ​

  • fn_actions is deprecated, and its functionality has been superseded by direct keycodes and process_record_user()
  • The end result of removing this obsolete feature should result in a decent reduction in firmware size and code complexity
  • All keymaps affected are recommended to switch away from fn_actions in favour of the custom keycode and macro features

Update Atreus to current code conventions ​

  • Duplicate include guards have bypassed the expected header processing behavior
  • All keymaps affected are recommended to remove duplication of <keyboard>/config.h to <keyboard>/keymaps/<user>/config.h and only provide overrides at the keymap level

Backport changes to keymap language files from ZSA fork ​

  • Fixes an issue in the keymap_br_abnt2.h file that includes the wrong source (keymap_common.h instead of keymap.h)
  • Updates the keymap_swedish.h file to be specific to swedish, and not just "nordic" in general.
  • Any keymaps using this will need to remove NO_* and replace it with SE_*.

Update repo to use LUFA as a git submodule ​

  • /lib/LUFA removed from the repo
  • LUFA set as a submodule, pointing to qmk/lufa
  • This should allow more flexibility with LUFA, and allow us to keep the sub-module up to date, a lot more easily. It was ~2 years out of date with no easy path to fix that. This prevents that from being an issue in the future

Migrating ACTION_BACKLIGHT_*() entries in fn_actions to BL_ keycodes ​

  • fn_actions is deprecated, and its functionality has been superseded by direct keycodes and process_record_user()
  • All keymaps using these actions have had the relevant KC_FN* keys replaced with the equivalent BL_* keys
  • If you currently use KC_FN* you will need to replace fn_actions with the custom keycode and macro features

Remove KC_DELT alias in favor of KC_DEL ​

  • KC_DELT was a redundant, undocumented alias for KC_DELETE
  • It has been removed and all its uses replaced with the more common KC_DEL alias
  • Around 90 keymaps (mostly for ErgoDox boards) have been modified as a result