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lib/store/memories/children.ex
defmodule Store.Memories.Children do
@moduledoc """
Handles children.log file operations for memories.
Format: newline-delimited list of child slugs (one per line).
"""
@filename "children.log"
@doc """
Reads children.log from a memory directory.
Returns list of child slugs.
"""
@spec read(String.t()) :: [String.t()]
def read(memory_dir) do
path = Path.join(memory_dir, @filename)
case File.read(path) do
{:ok, content} ->
content
|> String.split("\n", trim: true)
{:error, :enoent} ->
[]
{:error, _} ->
[]
end
end
@doc """
Writes children.log for a memory using atomic write.
Takes a memory struct.
"""
@spec write(AI.Memory.t(), [String.t()]) :: :ok | {:error, term}
def write(memory, children) do
memory_dir = get_memory_dir(memory)
write_path(memory_dir, children)
end
@doc """
Writes children.log to a specific path (used by parent operations).
"""
@spec write_path(String.t(), [String.t()]) :: :ok | {:error, term}
def write_path(memory_dir, children) do
path = Path.join(memory_dir, @filename)
content = Enum.join(children, "\n")
write_atomic(path, content)
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