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lib/util/env.ex
defmodule Util.Env do
@moduledoc """
Utilities for interpreting environment variables used in fnord.
Provide canonical parsing helpers so different runtime contexts treat
environment values consistently (escript, mix run, CI, etc.).
"""
@doc """
Return true when the provided environment value is considered truthy.
Recognizes the common truthy values (case-insensitive): "1", "true", and "yes".
Returns false for nil, empty strings, and other values.
"""
@spec looks_truthy?(binary) :: boolean
def looks_truthy?(env_var_name) do
case fetch_env(env_var_name) do
{:ok, v} ->
truthy_value?(v)
{:error, :not_set} ->
false
end
end
# Internal helper: interpret a raw env value (string) as truthy/falsey
@spec truthy_value?(binary) :: boolean
defp truthy_value?(val) do
val
|> String.trim()
|> String.downcase()
|> case do
"1" -> true
"true" -> true
"yes" -> true
_ -> false
end
end
@spec mcp_debug_enabled?() :: boolean
def mcp_debug_enabled? do
looks_truthy?("FNORD_DEBUG_MCP")
end
@spec cursor_rules_debug_enabled?() :: boolean
def cursor_rules_debug_enabled? do
looks_truthy?("FNORD_DEBUG_CURSOR_RULES")
end
@spec get_env(binary, any) :: any
def get_env(var, default \\ nil) do
case System.get_env(var) do
nil -> default
v -> v
end
end
@spec fetch_env(binary) :: {:ok, binary} | {:error, :not_set}
def fetch_env(var) do
case System.get_env(var) do
nil -> {:error, :not_set}
v -> {:ok, v}
end
end
@doc """
Set the environment variable to the given value.
"""
@spec put_env(binary, binary) :: :ok
def put_env(var, value) do
System.put_env(var, value)
end
@doc """
Delete the environment variable.
"""
@spec delete_env(binary) :: :ok
def delete_env(var) do
System.delete_env(var)
end
end