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lib/store/memories/meta.ex
defmodule Store.Memories.Meta do
@moduledoc """
Handles meta.json file operations for memories.
Contains: id, slug, label, response_template, scope, parent_id, timestamps, counters, weight
"""
@filename "meta.json"
@doc """
Reads meta.json from a memory directory.
Returns {:ok, map} or {:error, reason}.
"""
@spec read(String.t()) :: {:ok, map} | {:error, term}
def read(memory_dir) do
path = Path.join(memory_dir, @filename)
with {:ok, content} <- File.read(path),
{:ok, data} <- Jason.decode(content) do
# Convert string keys to atoms for Memory struct
{:ok, atomize_keys(data)}
end
end
@doc """
Writes meta.json for a memory using atomic write.
"""
@spec write(AI.Memory.t()) :: :ok | {:error, term}
def write(memory) do
memory_dir = get_memory_dir(memory)
path = Path.join(memory_dir, @filename)
data = %{
id: memory.id,
slug: memory.slug,
label: memory.label,
response_template: memory.response_template,
scope: to_string(memory.scope),
parent_id: memory.parent_id,
weight: memory.weight,
created_at: memory.created_at,
last_fired: memory.last_fired,
fire_count: memory.fire_count,
success_count: memory.success_count
}
with {:ok, json} <- Jason.encode(data, pretty: true) do
write_atomic(path, json)
end
end
# ----------------------------------------------------------------------------
# Private Helpers
# ----------------------------------------------------------------------------
defp get_memory_dir(%AI.Memory{scope: :global, slug: slug}) do
Path.join([Settings.get_user_home(), ".fnord/memories", slug])
end
defp get_memory_dir(%AI.Memory{scope: :project, slug: slug}) do
case Settings.get_selected_project() do
{:ok, project_name} ->
Path.join([Settings.get_user_home(), ".fnord/projects", project_name, "memories", slug])
{:error, :project_not_set} ->
raise "Cannot save project-scoped memory without a selected project. Use 'fnord config set-project <name>' first."
end
end
defp atomize_keys(map) when is_map(map) do
map
|> Enum.map(fn {k, v} -> {String.to_atom(k), v} end)
|> Map.new()
|> then(fn m ->
# Convert scope string back to atom
if m[:scope], do: Map.put(m, :scope, String.to_atom(m[:scope])), else: m
end)
end
defp write_atomic(path, content) do
dir = Path.dirname(path)
base = Path.basename(path)
tmp = Path.join(dir, ".#{base}.#{System.unique_integer([:positive])}.tmp")
with :ok <- File.write(tmp, content),
:ok <- File.rename(tmp, path) do
:ok
else
error ->
File.rm(tmp)
error
end
end
end