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May 10, 2025
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mbland added a commit to mbland/rules_scala that referenced this pull request Feb 21, 2025
Explicitly notes that some `rules_scala` APIs may break, specifically
`setup_scala_toolchain`. Part of bazel-contrib#1482.

Brought to my attention by @michalbogacz in a `#scala` thread in the
Bazel Slack workspace, which was in the context of
michalbogacz/scala-bazel-monorepo#26.

- https://bazelbuild.slack.com/archives/CDCKJ2KFZ/p1740144886159909
mbland added a commit to mbland/rules_scala that referenced this pull request Feb 26, 2025
Explicitly notes that some `rules_scala` APIs may break, specifically
`setup_scala_toolchain`. Part of bazel-contrib#1482.

Brought to my attention by @michalbogacz in a `#scala` thread in the
Bazel Slack workspace, which was in the context of
michalbogacz/scala-bazel-monorepo#26.

- https://bazelbuild.slack.com/archives/CDCKJ2KFZ/p1740144886159909
simuons pushed a commit to bazel-contrib/rules_scala that referenced this pull request Feb 28, 2025
* Update docs for version 7.0.0, remove old APIs

Describes the new `scala_toolchains()` API, breaking changes, Bazel
compatibility matrix, and breaking of the `io_bazel_rules_scala` repo
name dependency. Part of #1482, #1647, #1652, and #1699, it also removes
obsolete `WORKSPACE` APIs in favor of `scala_toolchains()`, et. al.

Much of the README text regarding `WORKSPACE` configuration, Bazel
compatibility, and breaking changes comes from:

- #1482 (comment)

The "Breaking changes in `rules_scala` 7.x" section of `README.md`
describes the removed `WORKSPACE` macros, and provides guidance for
adopting the `scala_toolchains()` API. Also includes information about
the upcoming Bzlmod implementation (#1482) and the Bazel 8 compatibility
changes for `rules_scala` 8.x (#1652).

Contains a light editing pass over almost every Markdown file to resolve
`markdownlint` warnings when editing in VSCode. Also added
`.markdownlint.json` to silence rule `MD033/no-inline-html`, since
several docs contain `<br/>` and/or `<table>` elements.

- https://github.com/DavidAnson/vscode-markdownlint?tab=readme-ov-file#markdownlintconfig

Performed other opportunistic grammar edits and added new information,
including:

- `docs/coverage.md`: Describes how to determine the default JaCoCo
  version used by `rules_java`

- `scripts/README.md`: Updates `create_repository.py` docs extensively,
  and adds a section for `sync_bazelversion.sh`

- Replaces `starlark` code fences with `py`, since the syntax is
  identical and editors seem to support it better.

---

Since the next major release is imminent, ensuring the documentation
accurately reflects all the changes since v6.6.0 has become an urgent
priority.

Rather than leave the old `WORKSPACE` APIs in place, which could lead to
surprising failures, this change removes all of them. This also changes
some code that still depended on some of these obsolete macros,
including `scala_toolchains()`. Since all the toolchainization changes
led to the entire project already using `scala_toolchains()` and
`scala_register_toolchains()` exclusively, this proved a low risk
refactoring.

With some Bzlmod and Bazel 8 information already in place, very little
will need to change when these implementations land. The commits that
contain those implementations will also include their relevant
documentation updates.

* Update GitHub refs, minor grammar error in README

It seems the README won't expand refs like #1482. This updates such refs
to use the repo prefix, e.g., #1482.

* More small README.md improvements

* s/stanza/snippet/g

Thanks to @bartoszkosiorek for pointing out in #1703 that "stanza" isn't
a common word. That was my former English Lit major innie leaking out,
applying a poetry term (a group of lines, like a paragraph) out of
context.

* Add Bzlmod repo scope change, `scala_toolchain`

Explicitly notes that some `rules_scala` APIs may break, specifically
`setup_scala_toolchain`. Part of #1482.

Brought to my attention by @michalbogacz in a `#scala` thread in the
Bazel Slack workspace, which was in the context of
michalbogacz/scala-bazel-monorepo#26.

- https://bazelbuild.slack.com/archives/CDCKJ2KFZ/p1740144886159909

* Update README.md per @grepwood's feedback in #1703

- Updates links not to use code tags, since it gives the appearance of
  multiple adjacent links.

- Updates issue reference missing the `bazelbuild/rules_scala` prefix.

- Moves paragraphs above "Getting started" `WORKSPACE` snippet to a new
  "Important changes in `rules_scala` v7.0.0 configuration" section
  following the snippet.

* Update `scala_toolchains()` docstring

Removes the reference to `@rules_scala_toolchains`, since that's not
really a public interface detail.

Prompted by a ping from @gergelyfabian in a Bazel Slack workspace direct
message, asking about the docstring currently reflected on `master`.

* Fix `WORKSPACE` snippet for `rules_java` 7.x

The `WORKSPACE` snippet in the `README.md` now matches what's currently
in all the other `WORKSPACE` files.

I'd previously included the `rules_java` 8.x statements from my Bazel 8
compatibility branch in the `README.md` changes for `rules_scala` 7.x.
@gergelyfabian tried the previous snippet from #1703, and it broke his
build:

- #1703 (comment)

* Clean up cross-compilation.md, rm deprecated attr

Includes a full editing pass over `docs/cross-compilation.md` and
removes the `incompatible_use_toolchain_transition` attribute, which
has been deprecated since before Bazel 6.5.0.

- https://bazel.build/versions/6.4.0/rules/lib/globals?hl=en#rule

The "Cross-build support tiers" could use extra review by someone more
knowledgable about that aspect of `rules_scala`.

Prompted by a suggestion by @gergelyfabian in #1703 to update a single
line, but turned into a complete overhaul.

* Fix `io_bazel_rules_scala`, version in README

Removes a remaining, incorrect `@io_bazel_rules_scala` reference in
`README.md`, as well as in the `.github/workflows/workspace_snippet.sh` script.
Updates the `README.md` to use `<VERSION>` in place of `7.0.0` in the
`WORKSPACE` snippet under "Getting started".

Prompted by a couple comments by @gergelyfabian in #1703. I used the following
command to confirm no more unintentional `io_bazel_rules_scala` references
remain. (I'm leaving the `test_intellij_aspect.sh` script alone for now.)

```txt
$ git ls-files | xargs grep 'io_bazel_rules_scala[^_]'

.github/workflows/workspace_snippet.sh:    name = "rules_scala",  # Can be "io_bazel_rules_scala" if you still need it.
README.md:    name = "rules_scala",  # Can be "io_bazel_rules_scala" if you still need it.
README.md:- __`rules_scala` no longer requires the `io_bazel_rules_scala` repository
test_intellij_aspect.sh:  bazel test --test_output=errors --override_repository io_bazel_rules_scala="${rules_scala_dir}"  --extra_toolchains=@io_bazel_rules_scala//scala:default_toolchain //aspect/testing/tests/src/com/google/idea/blaze/aspect/scala/...
```

There are still many `io_bazel_rules_scala_.*` references, most of them for
internal toolchain dependency repos. The `@io_bazel_rules_scala_config`
repository is the exception, which is a publicly documented interface. (We
_could_ change it, as another potential known breakage for `rules_scala`
v7.0.0.)

* Remove `testing` parameter from `scala_toolchains`

Removed in favor of using the existing `scalatest`, `junit`, and
`specs2` parameters at @simuons's suggestion in:

- #1482 (comment)

Also updated the `scala_toolchains()` docstring slightly and added `doc`
parameters to the `attrs` for `_scala_toolchains_repo()`.
@michalbogacz michalbogacz merged commit 42bafa4 into master May 10, 2025
1 check passed
@michalbogacz michalbogacz deleted the bazelmod-scala-test branch May 10, 2025 11:21
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