Ansible module template in Bash

ansible_module_template.bash

#!/usr/bin/env bash

# cp <module_name>.sh ./library/
# ansible localhost -M ./library/ -m <module_name> -a 'arg1=foo' --check -vvv

set -eu -o pipefail

# Arguments are passed as a file
arg_file="$(dirname "${BASH_SOURCE[0]}")/args"

# Check mode?
is_check_mode=yes
if grep -q '_ansible_check_mode=False' "$arg_file"; then
  is_check_mode=no
fi

# Get arguments
arg1=$(sed -E 's,.* foo=([^ ]+).*,\1,' "$arg_file")

# FIXME
changed=true
before=foo
after=bar

escape_json_string() {
  local double_quote_escaped
  double_quote_escaped="$(cat - | sed -E 's,",\\",g')"
  echo -n "${double_quote_escaped/$'\n'/\\n}"
}

cat << JSON
{
  "changed": $changed,
  "failed": false,
  "msg": "Hello, World!",
  "diff": {
    "before": "$(escape_json_string <<< $before)",
    "after": "$(escape_json_string <<< $after)"
  }
}
JSON