Add pyiron based example (#73)

* Add pyiron based example

* Add conda_subprocess as dependency

* remove empty lines

* Update source path

* Add Readme

* rename functions

* Update exemplary_workflow/pyiron/README.md

Co-authored-by: Philipp Diercks <55233917+pdiercks@users.noreply.github.com>

* Add explanation about storage in the README

* Use f-strings to call executables

---------

Co-authored-by: Philipp Diercks <55233917+pdiercks@users.noreply.github.com>

.github/workflows/main.yml

@@ -301,3 +301,35 @@ jobs:
       with:
         name: paper
         path: exemplary_workflow/gwl/paper.pdf
+
+  run-pyiron:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: checkout-repository
+        uses: actions/checkout@v2
+
+      - name: install-basic-deps
+        uses: ./.github/actions/install-basic-deps
+
+      - name: setup-conda-environment
+        uses: conda-incubator/setup-miniconda@v2
+        with:
+          miniforge-version: latest
+          activate-environment: exemplary_workflow
+          channels: conda-forge
+          channel-priority: strict
+
+      - name: run-workflow
+        shell: bash -l {0}
+        run: |
+          conda install conda_subprocess=0.0.1 pyiron_base=0.7.11
+          cd $GITHUB_WORKSPACE/exemplary_workflow/pyiron
+          python workflow.py
+      - name: upload-paper-artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: paper
+          path: ./exemplary_workflow/pyiron/workflow/tectonic_hdf5/tectonic/paper.pdf
+          retention-days: 1
+          if-no-files-found: error

exemplary_workflow/pyiron/README.md

@@ -0,0 +1,22 @@
+# pyiron
+This directory contains an implementation of the exemplary workflow with [pyiron](https://pyiron.org/) or more specifically the [pyiron_base](https://pyiron-base.readthedocs.io) workflow manager.
+
+## Installation
+For more detailed information we refer to the official [documentation](https://pyiron-base.readthedocs.io/en/latest/installation.html).
+The recommended way of installing `pyiron_base` is via conda, because it also enables `pyiron_base` to handle software dependencies of your workflow using the [conda_subprocess](https://github.com/pyiron/conda_subprocess) package.
+
+You can then install `pyiron_base` with
+```sh
+mamba create -c conda-forge -n pyiron_base pyiron_base=0.7.11 conda_subprocess=0.0.1
+```
+
+## Running the exemplary workflow
+The workflow can be run with
+```sh
+python workflow.py
+```
+The final output `paper.pdf` created using the `tectonic` package is then stored in the working direcrtory of last workflow step:
+```sh
+./workflow/tectonic_hdf5/tectonic/paper.pdf
+```
+This is a general feature of the `pyiron_base` workflow manager, each step of the workflow - called job - is executed in a separate working directory. 

exemplary_workflow/pyiron/workflow.py

@@ -0,0 +1,81 @@
+import os
+from pyiron_base import Project
+
+# input parameter 
+domain_size = 2.0
+
+# create pyiron project 
+pr = Project("workflow")
+
+# create conda environments for the proprocessing, processing and postprocessing stage 
+for k, v in {
+    "preprocessing": "../source/envs/preprocessing.yaml",
+    "processing": "../source/envs/processing.yaml",
+    "postprocessing": "../source/envs/postprocessing.yaml"
+}.items():
+    pr.conda_environment.create(env_name=k, env_file=v)
+
+
+# Preprocessing
+## generate mesh
+gmsh = pr.wrap_executable(
+    job_name="gmsh",
+    executable_str=f"gmsh -2 -setnumber domain_size {domain_size} unit_square.geo -o square.msh",
+    conda_environment_path=pr.conda_environment.preprocessing,
+    input_file_lst=["../source/unit_square.geo"],
+    execute_job=True,
+)
+
+## convert mesh to xdmf
+meshio = pr.wrap_executable(
+    job_name="meshio",
+    executable_str="meshio convert square.msh square.xdmf",
+    conda_environment_path=pr.conda_environment.preprocessing,
+    input_file_lst=[gmsh.files.square_msh],
+    execute_job=True,
+)
+
+
+# Processing
+## poisson
+def collect_output_poisson(working_directory):
+    with open(os.path.join(working_directory, "numdofs.txt"), "r") as f:
+        return {"numdofs": int(f.read())}
+
+poisson = pr.wrap_executable(
+    job_name="poisson",
+    executable_str="python poisson.py --mesh square.xdmf --degree 2 --outputfile poisson.pvd --num-dofs numdofs.txt",
+    collect_output_funct=collect_output_poisson,
+    conda_environment_path=pr.conda_environment.processing,
+    input_file_lst=["../source/poisson.py", meshio.files.square_xdmf, meshio.files.square_h5],
+    execute_job=True,
+)
+
+
+# Postprocessing
+## plot over line
+pvbatch = pr.wrap_executable(
+    job_name="pvbatch",
+    executable_str="pvbatch postprocessing.py poisson.pvd plotoverline.csv",
+    conda_environment_path=pr.conda_environment.postprocessing,
+    input_file_lst=["../source/postprocessing.py", poisson.files.poisson_pvd, poisson.files.poisson000000_vtu],
+    execute_job=True,
+)
+
+## substitute macros
+macros = pr.wrap_executable(
+    job_name="macros",
+    executable_str=f"python prepare_paper_macros.py --macro-template-file macros.tex.template --plot-data-path plotoverline.csv --domain-size {domain_size} --num-dofs {poisson.output['numdofs']} --output-macro-file macros.tex",
+    conda_environment_path=pr.conda_environment.postprocessing,
+    input_file_lst=["../source/macros.tex.template", "../source/prepare_paper_macros.py", pvbatch.files.plotoverline_csv],
+    execute_job=True,
+)
+
+## compile paper
+tectonic = pr.wrap_executable(
+    job_name="tectonic",
+    executable_str="tectonic paper.tex",
+    conda_environment_path=pr.conda_environment.postprocessing,
+    input_file_lst=["../source/paper.tex", macros.files.macros_tex, pvbatch.files.plotoverline_csv],
+    execute_job=True,
+)