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fnord
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lib/outputs.ex
defmodule Outputs do
@moduledoc """
Helpers for persisting raw assistant outputs for a project.
Outputs are written under:
~/fnord/outputs/<project_id>/<slug>.md
The content saved is the *raw* assistant response.
"""
@typedoc """
Represents a project identifier.
"""
@type project_id :: String.t()
@typedoc """
The raw response text from the assistant.
"""
@type raw_response :: String.t()
@typedoc """
A conversation identifier used for default slug generation.
"""
@type conversation_id :: String.t()
@typedoc """
A slug generated for output filenames.
"""
@type slug :: String.t()
@typedoc """
The path to an output file.
"""
@type output_path :: String.t()
@typedoc """
Options for the save function, currently supported keys:
- :conversation_id - a conversation_id
"""
@type save_opts :: [conversation_id: conversation_id]
@typedoc """
Result of a save operation.
On success returns {:ok, output_path}, on failure {:error, reason}.
"""
@type save_result :: {:ok, output_path} | {:error, term()}
@doc """
Returns the directory path for outputs for a given project.
Uses Settings.get_user_home() and returns ~/fnord/outputs/<project_id>.
"""
@spec outputs_dir(project_id()) :: String.t()
def outputs_dir(project_id) when is_binary(project_id) do
Path.join([
Settings.get_user_home(),
"fnord",
"outputs",
project_id
])
end
@doc """
Saves the raw assistant markdown response for a project.
Derives the filename slug from the first line "# Title: ..." if present, falls back to "conversation-<conversation_id>" or "untitled".
Resolves filename collisions by appending "-N".
Uses FileLock.with_lock and Settings.write_atomic! for atomic writes.
Returns {:ok, output_path} on success or {:error, reason} on failure.
"""
@spec save(project_id(), raw_response(), save_opts()) :: save_result()
def save(project_id, raw_response, opts \\ [])
when is_binary(project_id) and
is_binary(raw_response) and
is_list(opts) do
dir = outputs_dir(project_id)
File.mkdir_p!(dir)
slug =
case extract_title(raw_response) do
title when is_binary(title) and title != "" ->
slugified = slugify(title)
if slugified != "", do: slugified, else: default_slug(opts)
_ ->
default_slug(opts)
end
path = unique_path(dir, slug)
lock_path = path <> ".lock"
case FileLock.with_lock(lock_path, fn ->
Settings.write_atomic!(path, raw_response)
path
end) do
{:ok, result} when is_binary(result) ->
{:ok, result}
{:ok, other} ->
{:error, other}
{:error, reason} ->
{:error, reason}
end
end
@doc """
Extracts the title from the raw response.
Expects the first line in the format "# Title: <title>" (case-insensitive).
Returns the trimmed title or nil if missing or blank.
"""
@spec extract_title(raw_response()) :: String.t() | nil
def extract_title(raw_response) when is_binary(raw_response) do
raw_response
|> String.split("\n", parts: 2)
|> List.first()
|> case do
nil ->
nil
first_line ->
case Regex.run(~r/^# Title:\s*(.+)$/i, first_line) do
[_, title] ->
trimmed = String.trim(title)
if trimmed == "", do: nil, else: trimmed
_ ->
nil
end
end
end
@doc """
Converts a text string into a URL-friendly slug.
Lowercases, trims whitespace, replaces non-alphanumeric characters with hyphens, and trims leading/trailing hyphens.
"""
@spec slugify(String.t()) :: slug()
def slugify(text) when is_binary(text) do
text
|> String.downcase()
|> String.trim()
|> then(&Regex.replace(~r/[^a-z0-9]+/, &1, "-"))
|> String.trim("-")
end
@spec default_slug(Keyword.t()) :: String.t()
defp default_slug(opts) when is_list(opts) do
case Keyword.get(opts, :conversation_id) do
id when is_binary(id) and id != "" ->
"conversation-#{id}"
_ ->
"untitled"
end
end
@spec unique_path(String.t(), String.t(), non_neg_integer()) :: String.t()
defp unique_path(dir, slug, counter \\ 0)
when is_binary(dir) and is_binary(slug) and is_integer(counter) and counter >= 0 do
filename =
if counter == 0 do
"#{slug}.md"
else
"#{slug}-#{counter}.md"
end
path = Path.join(dir, filename)
if File.exists?(path) do
unique_path(dir, slug, counter + 1)
else
path
end
end
end