turn mjml into html and txt.

mjml-2-mjml-and-txt.sh

# Check if mjml is installed
if ! [ -x "$(command -v mjml)" ]; then
  echo 'Error: mjml is not installed. Install with "npm install -g mjml"' >&2
  exit 1
fi
# Check if html-to-text is installed
if ! [ -x "$(command -v html-to-text)" ]; then
  echo 'Error: html-to-text is not installed. Install with "npm install -g html-to-text"' >&2
  exit 1
fi
# Run command for all files passed as arguments to the script
for FILENAME in "$@"
do
  echo Input: $FILENAME
  FILENAME=${FILENAME%.*}
  mjml -o $FILENAME.html $FILENAME.mjml
  cat $FILENAME.html | html-to-text > $FILENAME.txt
done

Compile one file
mjml-2-mjml-and-txt.sh mail.mjml

Compile all mjml files in the current directory
mjml-2-mjml-and-txt.sh *.mjml