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AI code archaeology
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lib/ai/message/system.ex
defmodule AI.Message.System do
@moduledoc """
System/developer instruction message.
Internal shape (matches the chat-completions raw map shape that existing
pattern matches expect):
%AI.Message.System{role: "developer" | "system", content: "<binary>"}
The `role` field is configurable: OpenAI's Responses-era convention is
`"developer"`; Venice and other providers may prefer the legacy `"system"`.
Construct via `AI.Message.system/2` and pass `role:` in opts when needed.
Wire shape (built on demand by `to_map/1`):
%{type: "message", role: <role>,
content: [%{type: "input_text", text: "..."}]}
"""
@behaviour AI.Message
@derive {Jason.Encoder, only: [:role, :content]}
defstruct role: "developer", content: ""
@type t :: %__MODULE__{role: binary(), content: binary()}
@doc """
Build a system message from a binary.
Options:
* `:role` - override the default `"developer"` role with `"system"` (or
any other string a provider expects).
"""
@spec new(binary(), keyword()) :: t()
def new(text, opts \\ []) when is_binary(text) do
%__MODULE__{
content: text,
role: Keyword.get(opts, :role, "developer")
}
end
@impl AI.Message
def text(%__MODULE__{content: c}), do: c
# System messages are excluded from research transcripts - they're
# instructions to the model, not part of the user/assistant exchange.
@impl AI.Message
def for_transcript(%__MODULE__{}), do: nil
@impl AI.Message
def to_map(%__MODULE__{content: c, role: role}) do
%{type: "message", role: role, content: [%{type: "input_text", text: c}]}
end
@doc """
Hydrate from a Responses-shaped or legacy chat-completions-shaped map
(atom or string keys). Preserves the role from the source so `"system"`
and `"developer"` round-trip distinctly.
"""
@spec from_map(map()) :: t()
def from_map(raw) do
role = AI.Message.get(raw, :role) || "developer"
content = AI.Message.get(raw, :content)
text =
case content do
list when is_list(list) ->
list
|> Enum.map(&part_text/1)
|> Enum.reject(&is_nil/1)
|> Enum.join("")
binary when is_binary(binary) ->
binary
nil ->
""
end
%__MODULE__{content: text, role: role}
end
defp part_text(%{} = part) do
case AI.Message.get(part, :text) do
txt when is_binary(txt) -> txt
_ -> nil
end
end
defp part_text(_), do: nil
end