A YAML Github Actions file to build a dtx file from various other files

build-dtx.yml

# Build a .dtx file from the contents of the existing files

name: Build DTX File

# Controls when the action will run. Triggers the workflow on push events on the develop branch
on:
  push:
    branches: [ develop ]

jobs:
  # This workflow contains a single job called "build"
  build:
    # This runs on the current latest verion of Ubuntu
    runs-on: ubuntu-18.04

    steps:
    # Checks-out the repository under $GITHUB_WORKSPACE, so the job can access it
    - name: Check-out repository
      uses: actions/checkout@v2
      with:
        ref: ${{ github.head_ref }}

    # Cds to the repo
    - name: Move to the repo
      run: cd $GITHUB_WORKSPACE

    # Gets the list of files to put into the dtx file
    - name: Get the list of files needed
      run: find ./src -not -path '*/\.*' -type f > /home/runner/paths.txt
    
    # Creates the dtx file
    - name: (Re)create the dtx file
      run: "> ./dnd.dtx"
    
    # The main step: puts the contents of each .sty file into the dtx file and adds the appropriate tags
    - name: Populate the dtx file
      run: while read -r path; do fileext=$(basename -- "$path"); filename="${fileext%.*}"; echo '%<*'"$filename"'>' >> dnd.dtx; cat "$path" >> dnd.dtx; echo '%</'"$filename"'>' >> dnd.dtx; done < /home/runner/paths.txt
    
    # Doubles comments so they don't get stripped
    - name: Fix comments
      run: perl -i -p -e "s/^\%(?!\%)(?!\<\*)(?!\<\/)/\%\%/mg" dnd.dtx
    
    # Adds \iffalse and \fi at the beginning and end for docstrip
    - name: Add other necessary parts
      run: ex -sc '1i|% \iffalse' -c '$a|% \fi' -cx dnd.dtx
        
    # Pushes the final file to the repository
    - name: Push dtx file back to repository
      uses: stefanzweifel/git-auto-commit-action@v4
      with:
       commit_message: Auto-update dnd.dtx
       branch: develop