action.yml

name: 'Install R'
description: 'Install UCRT-build of R'
inputs:
  ucrt3-release:
    description: 'release tag for UCRT3'
    required: false
    default: 'v0.10'
runs:
  using: 'composite'
  steps:
    - name: Cache R installation
      uses: actions/cache@v2
      env:
        cache-name: cache-r
      with:
        path: ~/r
        key: ${{ env.cache-name }}-${{ inputs.ucrt3-release }}

    - name: Install R
      run: |
        if [ "${{ runner.os }}" = Windows -a ! -d ~/r ] ; then
          echo "::group::Downloading and installing R"
          TAG="${{ inputs.ucrt3-release }}"
          URL=`curl -s https://api.github.com/repos/kalibera/ucrt3/releases | \
            sed -n 's!^ *\"*browser_download_url\"*: \"\(.*/download/'$TAG'/R-devel-win.*\)\"!\1!p'`
          curl -s -L $URL > rinst.exe
          if [ ! -x rinst.exe ] ; then
            echo "::error ::ERROR: failed to download R installer"
            exit 1
          fi
          ./rinst.exe //VERYSILENT //SUPPRESSMSGBOXES //CURRENTUSER //DIR=`cygpath -wa ~/r`
          rm -f rinst.exe
          if [ ! -x ~/r/bin/R.exe ] ; then
            echo "::error ::ERROR: failed to install R"
            exit 1
          fi
          echo "::endgroup::"
        fi
      shell: bash

    - name: Set up environment for R
      run: |
        if [ "${{ runner.os }}" = Windows ] ; then
          echo "::group::Setting up environment for R"
          echo ~/r/bin >> $GITHUB_PATH
          # Prevent interference from pre-installed R
          echo "R_LIBS_USER=NULL" >> $GITHUB_ENV
          echo "R_LIBS_SITE=NULL" >> $GITHUB_ENV
          # Define a time-zone
          echo "TZ=Europe/Prague" >> $GITHUB_ENV
          echo "::endgroup::"
        fi
      shell: bash