Use miniconda and install pandoc and texlive

.editorconfig

@@ -19,3 +19,6 @@ insert_final_newline = false
 
 [Makefile]
 indent_style = tab
+
+[*.yml]
+indent_size = 2

.github/workflows/tests.yml

@@ -21,21 +21,33 @@ jobs:
 
     - uses: actions/checkout@v2
 
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+    - name: Set up Python ${{ matrix.python-version }} with Miniconda
+      uses: goanpeca/setup-miniconda@v1
       with:
         python-version: ${{ matrix.python-version }}
+        channels: conda-forge
 
     - name: Install dependencies
+      shell: bash -l {0}
       run: |
+        which python
+        python --version
         python -m pip install --upgrade pip
-        pip install -r requirements-dev.txt
+        python -m pip install -r requirements-dev.txt
+        conda install pandoc tectonic
+        mkdir bin
+        ln -s $(which tectonic) /usr/local/bin/xelatex
+        echo "::add-path::/usr/local/bin/"
+      # pandoc is for markdown-based export formats.
+      # tectonic is a TeX distribution. a LaTeX engine is needed for pdf export format.
 
     - name: Lint package
+      shell: bash -l {0}
       run: |
         make lint
 
     - name: Run tests
+      shell: bash -l {0}
       run: |
         make test
 
@@ -44,4 +56,4 @@ jobs:
       with:
         file: ./coverage.xml
         fail_ci_if_error: true
-      if: ${{ matrix.os == 'ubuntu-latest' && matrix.python-version == 3.8 }}
+      if: matrix.os == 'ubuntu-latest' && matrix.python-version == 3.8