testing for latex installation

Author: pancetta

.github/workflows/ci_pipeline.yml

@@ -18,7 +18,8 @@ jobs:
       - name: Add packages
         run: |
           sudo apt-get update
-          sudo apt-get --yes install texlive-latex-recommended texlive-fonts-recommended texlive-latex-extra cm-super dvipng nodejs
+          sudo apt-get --yes install nodejs
+#          sudo apt-get --yes install texlive-latex-recommended texlive-fonts-recommended texlive-latex-extra cm-super dvipng nodejs
 
       - name: Cache conda
         uses: actions/cache@v2
@@ -55,12 +56,10 @@ jobs:
 
       - name: Lint with flake8
         run: |
-          conda install --yes -c conda-forge flake8 flake8-comprehensions flake8-bugbear
           flake8 pySDC
 
       - name: Run pytest
         run: |
-          conda install --yes -c conda-forge pytest-cov
           pytest -v --cov=pySDC --cov-config=.coveragerc --cov-report=html --cov-report=term --durations=0 pySDC/tests
 
       - name: Build documentation

README.rst

@@ -14,7 +14,7 @@ Features
 - 8 tutorials: from setting up a first collocation problem to SDC, PFASST and advanced topics
 - Projects: many documented projects with defined and tested outcomes
 - Many different examples, collocation types, data types already implemented
-- Works with `PETSc <http://www.mcs.anl.gov/petsc/>`_ through `petsc4py <https://bitbucket.org/petsc/petsc4py>`_ , `FEniCS <https://fenicsproject.org/>`_ and `mpi4py-fft <https://mpi4py-fft.readthedocs.io/en/latest/>`_
+- Works with `PETSc <http://www.mcs.anl.gov/petsc/>`_ through `petsc4py <https://bitbucket.org/petsc/petsc4py>`_, `FEniCS <https://fenicsproject.org/>`_ and `mpi4py-fft <https://mpi4py-fft.readthedocs.io/en/latest/>`_
 - Continuous integration via `Github Actions <https://github.com/Parallel-in-Time/pySDC/actions>`__
 - Fully compatible with Python 3.6 - 3.9
 

pySDC/helpers/plot_helper.py

@@ -1,6 +1,6 @@
 import matplotlib as mpl
-mpl.use('pgf')
 import matplotlib.pyplot as plt
+from distutils.spawn import find_executable
 
 
 def figsize(textwidth, scale, ratio):
@@ -14,9 +14,7 @@ def figsize(textwidth, scale, ratio):
 
 def setup_mpl(font_size=8):
     # Set up plotting parameters
-    pgf_with_latex = {  # setup matplotlib to use latex for output
-        "pgf.texsystem": "pdflatex",  # change this if using xetex or lautex
-        "text.usetex": True,  # use LaTeX to write all text
+    style_options = {  # setup matplotlib to use latex for output
         "font.family": "serif",
         "font.serif": [],  # blank entries should cause plots to inherit fonts from the document
         "font.sans-serif": [],
@@ -39,12 +37,26 @@ def setup_mpl(font_size=8):
         "grid.alpha": 0.25,
         "figure.subplot.hspace": 0.0,
         "savefig.pad_inches": 0.01,
-        "pgf.preamble": r"\usepackage[utf8x]{inputenc}"
-                        r"\usepackage[T1]{fontenc}"
-                        r"\usepackage{underscore}"
-                        r"\usepackage{amsmath,amssymb,marvosym}"
     }
-    mpl.rcParams.update(pgf_with_latex)
+
+    mpl.rcParams.update(style_options)
+
+    if find_executable('latex'):
+
+        latex_support = {
+            "pgf.texsystem": "pdflatex",  # change this if using xetex or lautex
+            "text.usetex": True,  # use LaTeX to write all text
+            "pgf.preamble": r"\usepackage[utf8x]{inputenc}"
+                            r"\usepackage[T1]{fontenc}"
+                            r"\usepackage{underscore}"
+                            r"\usepackage{amsmath,amssymb,marvosym}"
+        }
+    else:
+        latex_support = {
+            "text.usetex": False,  # use LaTeX to write all text
+        }
+
+    mpl.rcParams.update(latex_support)
 
 
 def newfig(textwidth, scale, ratio=0.6180339887):
@@ -54,7 +66,7 @@ def newfig(textwidth, scale, ratio=0.6180339887):
 
 
 def savefig(filename, save_pdf=True, save_pgf=True, save_png=True):
-    if save_pgf:
+    if save_pgf and find_executable('latex'):
         plt.savefig('{}.pgf'.format(filename), bbox_inches='tight')
     if save_pdf:
         plt.savefig('{}.pdf'.format(filename), bbox_inches='tight')

pySDC/projects/AllenCahn_Bayreuth/run_simple_forcing_verification.py

@@ -249,7 +249,7 @@ def visualize_radii():
 
         # test if all went well
         assert glob.glob(f'{f}.pdf'), 'ERROR: plotting did not create PDF file'
-        assert glob.glob(f'{f}.pgf'), 'ERROR: plotting did not create PGF file'
+        # assert glob.glob(f'{f}.pgf'), 'ERROR: plotting did not create PGF file'
         assert glob.glob(f'{f}.png'), 'ERROR: plotting did not create PNG file'
 
         # set up plot for volumes
@@ -274,7 +274,7 @@ def visualize_radii():
 
         # test if all went well
         assert glob.glob(f'{f}.pdf'), 'ERROR: plotting did not create PDF file'
-        assert glob.glob(f'{f}.pgf'), 'ERROR: plotting did not create PGF file'
+        # assert glob.glob(f'{f}.pgf'), 'ERROR: plotting did not create PGF file'
         assert glob.glob(f'{f}.png'), 'ERROR: plotting did not create PNG file'
 
 

requirements.txt

@@ -13,6 +13,9 @@ fenics>=2019.1.0
 mpi4py-fft>=2.0.2
 # These packages are used for CI/CD and can be ignored
 pip
+flake8
+flake8-comprehensions
+flake8-bugbear
 pytest
 pytest-cov
 sphinx