[actions] Extend GitHub action to run also on MacOS

Author: tkoeppe

.github/workflows/check.yml

@@ -11,29 +11,53 @@ defaults:
 
 jobs:
   run-checks:
-    name: Run checks
-    runs-on: ubuntu-22.04
+    name: Run checks on ${{matrix.cfg.name}}
+    runs-on: ${{matrix.cfg.os}}
+
+    strategy:
+      matrix:
+        cfg:
+          - { name: 'Linux', os: 'ubuntu-22.04' }
+          - { name: 'MacOS', os: 'macos-12' }
 
     steps:
       - name: checkout
         uses: actions/checkout@v2
 
+      - name: install GNU tools
+        if: matrix.cfg.os == 'macos-12'
+        run: |
+          brew install gnu-sed
+          echo "/usr/local/opt/gnu-sed/libexec/gnubin" >> ${GITHUB_PATH}
+
       - name: check-source.sh
         run: ../tools/check-source.sh
 
       - name: update-apt-cache
+        if: matrix.cfg.os == 'ubuntu-22.04'
         run: sudo apt-get update
 
-      - name: install
+      - name: install (Linux)
+        if: matrix.cfg.os == 'ubuntu-22.04'
         run: sudo apt-get install latexmk texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended lmodern
 
+      - name: install (MacOS, Part 1/2)
+        if: matrix.cfg.os == 'macos-12'
+        run: |
+          brew install basictex
+          eval "$(/usr/libexec/path_helper)"
+          echo "PATH=${PATH}" >> ${GITHUB_ENV}
+          sudo tlmgr update --self
+          sudo tlmgr install latexmk isodate substr relsize ulem fixme rsfs extract layouts enumitem l3packages l3kernel imakeidx splitindex xstring
+
       - name: make
         run: make quiet
 
       - name: check-output.sh
         run: ../tools/check-output.sh
 
       - name: upload PDF
+        if: matrix.cfg.os == 'ubuntu-22.04'
         uses: actions/upload-artifact@v2
         with:
           name: draft-snapshot

README.rst

@@ -24,7 +24,7 @@ Install the `MacTeX distribution <http://tug.org/mactex/>`_.
 If you are on a slow network, you'll want to get the `BasicTeX package <http://tug.org/mactex/morepackages.html>`_ instead,
 then run the following command to install the other packages that the draft requires:
 
-   sudo tlmgr install latexmk isodate substr relsize ulem fixme rsfs extract layouts enumitem l3packages l3kernel imakeidx splitindex
+   sudo tlmgr install latexmk isodate substr relsize ulem fixme rsfs extract layouts enumitem l3packages l3kernel imakeidx splitindex xstring
 
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 Getting Started on Debian-based Systems