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lib/store/memories/heuristic.ex
defmodule Store.Memories.Heuristic do
@moduledoc """
Handles heuristic.json file operations for memories.
Contains: pattern_tokens (bag-of-words with frequencies)
"""
@filename "heuristic.json"
@doc """
Reads heuristic.json from a memory directory.
"""
@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
{:ok, data}
end
end
@doc """
Writes heuristic.json for a memory using atomic write with FileLock.
"""
@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 = %{
pattern_tokens: memory.pattern_tokens
}
with {:ok, json} <- Jason.encode(data, pretty: true) do
FileLock.with_lock(path, fn ->
write_atomic(path, json)
end)
|> case do
{:ok, :ok} -> :ok
{:ok, result} -> result
error -> error
end
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 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