text: # Copyright (C) 2021 Cancer Care Associates
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import io
  import pathlib
  
  from pymedphys._imports import plt
  from pymedphys._imports import streamlit as st
  
  from pymedphys._streamlit import categories
  from pymedphys._streamlit.utilities import download
  
  CATEGORY = categories.PLANNING
  TITLE = "Download Demo"
  
  THIS = pathlib.Path(__file__).resolve()
  
  
  def main():
      st.write(
          "This is a demo Streamlit app showing how to use the "
          "`download` function. The docstring for the "
          "`download` function is as follows:"
      )
  
      st.code(download.__doc__)
  
      st.write("## Example uses of `download`")
  
      st.write("### Download this very Python file")
  
      with open(THIS) as f:
          download(THIS.name, f.read())
  
      st.write("### Download a text file")
      download("a_text_file.txt", "Some beautiful text!")
  
      st.write("### Download a matplotlib figure")
      left, right = st.beta_columns(2)
  
      fig, ax = plt.subplots()
      ax.plot([-1, 0, 1], [1, -1, 1])
  
      with left:
          st.pyplot(fig)
  
      with right:
          _download_figure("plot.png", fig)
  
  
  def _download_figure(name, fig):
      buffer = io.BytesIO()
      fig.savefig(buffer, format=name.split(".")[-1])
      buffer.seek(0)
      download(name, buffer.read())
  