Publish spec (#18526)

[skip ci]

Author: sjrd

.github/workflows/spec.yml

@@ -0,0 +1,55 @@
+name: Specification
+
+on:
+  push:
+    tags:
+      - '*'
+    branches-ignore:
+      - 'gh-readonly-queue/**'
+  pull_request:
+  merge_group:
+  workflow_dispatch:
+
+env:
+  DOTTY_CI_RUN: true
+
+jobs:
+  specification:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./docs/_spec
+
+    steps:
+      - uses: actions/checkout@v3
+
+      # Keep in sync with ./docs/_spec/Dockerfile
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '2.7'
+      - name: Install required gems
+        run: |
+          gem update --system
+          gem install sass-embedded -v 1.58.0
+          gem install bundler:1.17.2 jekyll
+          bundle install
+          npm install bower
+
+      - name: Build the specification
+        run: |
+          bundle exec jekyll build
+
+      # Deploy
+      - name: Deployment
+        env:
+          USER_FOR_TEST: ${{ secrets.SPEC_DEPLOY_USER }}
+        if: ${{ env.USER_FOR_TEST != '' }}
+        uses: burnett01/[email protected]
+        with:
+          switches: -rzv
+          path: docs/_spec/_site/
+          remote_path: ${{ secrets.SPEC_DEPLOY_PATH }}
+          remote_host: ${{ secrets.SPEC_DEPLOY_HOST }}
+          remote_user: ${{ secrets.SPEC_DEPLOY_USER }}
+          remote_key: ${{ secrets.SPEC_DEPLOY_KEY }}
+          remote_key_pass: ${{ secrets.SPEC_DEPLOY_PASS }}

docs/_spec/Dockerfile

@@ -1,3 +1,5 @@
+# Keep in sync with relevant parts of .github/workflows/spec.yml
+
 FROM ruby:2.7
 
 RUN apt-get install -y curl \

docs/_spec/README.md

@@ -1,6 +1,6 @@
 # WIP Scala 3 Language Specification
 
-**This is still a work in progress, and should *not* be regarded as a source of truth.**
+**This is still a work in progress. There are still Scala 3 features missing, as well as some areas that have not been updated since 2.13 yet.**
 
 First of all, the language specification is meant to be correct, precise and clear.
 
@@ -25,8 +25,8 @@ To preview locally, run the following commands in the docs/_spec subfolder:
 env UID="$(id -u)" GID="$(id -g)" docker-compose up
 ```
 
-and open http://0.0.0.0:4000/files/archive/spec/2.13/ to view the spec. Jekyll will rebuild as you edit the markdown, but make sure to restart it when you change `_config.yml`.
-<!-- 
+and open http://0.0.0.0:4000/files/archive/spec/3.4/ to view the spec. Jekyll will rebuild as you edit the markdown, but make sure to restart it when you change `_config.yml`.
+<!--
 To preview locally, run the following commands in the root of your checkout scala/scala:
 `bundle install` to install Jekyll and `bundle exec jekyll serve -d build/spec/ -s spec/ -w --baseurl=""` to start it,
 and open http://0.0.0.0:4000/ to view the spec. Jekyll will rebuild as you edit the markdown, but make sure to restart it when you change `_config.yml`.

docs/_spec/_config.yml

@@ -1,6 +1,6 @@
-baseurl: /files/archive/spec/2.13
-latestScalaVersion: 2.13
-thisScalaVersion: 2.13
+baseurl: /files/archive/spec/3.4
+latestScalaVersion: 3.4
+thisScalaVersion: 3.4
 versionCompareMessage: "an upcoming"
 safe: true
 lsi: false
@@ -9,3 +9,15 @@ markdown: redcarpet
 encoding: utf-8
 redcarpet:
   extensions: ["no_intra_emphasis", "fenced_code_blocks", "autolink", "tables", "with_toc_data", "strikethrough", "lax_spacing", "space_after_headers", "superscript", "footnotes", "disable_indented_code_blocks"]
+exclude:
+  - APPLIEDreference
+  - TODOreference
+  - docker-compose.yml
+  - Dockerfile
+  - Gemfile
+  - Gemfile.lock
+  - README.md
+  - spec-toc.xslt
+  - package.json
+  - package-lock.json
+  - node_modules

docs/_spec/index.md

@@ -11,6 +11,21 @@ Martin Odersky, Philippe Altherr, Vincent Cremet, Sébastien Doeraene, Gilles Du
 
 Markdown Conversion by Iain McGinniss.
 
+#### Disclaimer: Work in Progress
+
+This specification for Scala 3 is still a work in progress.
+Some features added in Scala 3 are missing.
+Here is a list of the most important missing aspects:
+
+* `extension` methods
+* `given` and `using` contextual abstractions
+* type-class derivation with `derives`
+* behavior of structural types based on `Selectable`
+* meta-programming with `inline def`s and quotes
+* match types (pending a [Scala Improvement Proposal](https://github.com/scala/improvement-proposals/pull/65) with a full specification)
+
+For those features, the best reference so far remains [the Scala 3 Reference](https://docs.scala-lang.org/scala3/reference/).
+
 #### Preface
 
 Scala is a Java-like programming language which unifies