Turns an appsettings.json into flat json of key-value pairs, or, shell friendly list of plain key-value pairs

flatten

#!/bin/sh

toEnvVars() {
  toFlatJson "$1" | jq --raw-output '. | to_entries[] | "\(.key)=\(.value)"'
}

toFlatJson() {
  # thank you jeff mercado https://stackoverflow.com/a/42303836/659715
  jq --arg delim '__' 'reduce (tostream|select(length==2)) as $i ({};
      .[[$i[0][]|tostring]|join($delim)] = $i[1]
  )' "$1"
}

# One of the args should be a json file.
# If there's only one arg, then that's the json file.
if [ -z "$2" ]; then
  toFlatJson "$1"
  exit 0
fi

# So we've been passed a file.
# Assume it's json. Sorry.

# Translate the json file to a shell-friendly list of k=v lines
[ "$1" = "-e" ] && toEnvVars "$2"

# Translate the json file to a flat object of key value pairs
[ "$1" = "-j" ] && toFlatJson "$2"

Can use like:

docker run --rm --env-file <(flatten -e SomeProject/appsettings.Docker.json) some-project