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lib/cmd/indexer.ex
defmodule Cmd.Indexer do
@moduledoc """
This module provides the functionality for the `index` sub-command.
"""
defstruct [
:opts,
:indexer_module,
:indexer,
:root,
:store,
:reindex
]
@doc """
Create a new `Indexer` struct.
"""
def new(opts, indexer \\ Indexer) do
reindex = Map.get(opts, :reindex, false)
root =
case Map.get(opts, :directory, nil) do
root when is_binary(root) ->
Path.absname(root)
nil ->
settings = Settings.new()
case Settings.get_root(settings) do
{:ok, root} ->
root
{:error, :not_found} ->
raise """
Error: the project root was not found in the settings file.
This can happen under the following circumstances:
- the first index of a project
- the first index reindexing after moving the project directory
- the first index after the upgrade that made --dir optional
Re-run with --dir to specify the project root directory and update the settings file.
"""
end
end
Settings.set_project(Settings.new(), %{"root" => root})
%__MODULE__{
opts: opts,
indexer_module: indexer,
indexer: indexer.new(),
root: root,
store: Store.new(),
reindex: reindex
}
end
@doc """
Run the indexing process using the given `Indexer` struct. If `force_reindex`
is `true`, the project will be deleted and reindexed from scratch.
"""
def run(idx) do
project = Application.get_env(:fnord, :project)
if idx.reindex do
# Delete entire project directory when --force-reindex is passed
msg = "Deleting all embeddings to force full reindexing of #{project}"
spin(msg, fn ->
{"Burned it all to the ground", Store.delete_project(idx.store)}
end)
else
# Otherwise, just delete any files that no longer exist.
msg = "Deleting missing files from #{project}"
spin(msg, fn ->
{"Deleted missing files", Store.delete_missing_files(idx.store, idx.root)}
end)
end
{:ok, queue} = Queue.start_link(&process_file(idx, &1))
scanner =
Scanner.new(idx.root, fn file ->
Queue.queue(queue, file)
end)
count =
spin("Scanning project files", fn ->
num_files = count_files_to_index(idx)
total_files = Scanner.count_files(scanner)
msg = "Indexing #{num_files} of #{total_files} total files"
{msg, num_files}
end)
if count == 0 do
UI.warn("No files to index in #{project}")
else
spin("Indexing #{project}", fn ->
# count * 3 for each step in indexing a file (summary, outline, embeddings)
progress_bar_start(:indexing, "tasks", count * 3)
Scanner.scan(scanner)
Queue.shutdown(queue)
Queue.join(queue)
progress_bar_end()
{"All tasks complete", :ok}
end)
end
end
# -----------------------------------------------------------------------------
# Indexing process
# -----------------------------------------------------------------------------
defp process_file(idx, file) do
with {:ok, file_hash} <- get_file_hash(idx, file) do
file_contents = File.read!(file)
with {:ok, summary} <- get_summary(idx, file, file_contents),
{:ok, outline} <- get_outline(idx, file, file_contents),
{:ok, embeddings} <- get_embeddings(idx, file, summary, outline, file_contents) do
Store.put(idx.store, file, file_hash, summary, outline, embeddings)
else
{:error, reason} -> UI.warn("Error processing file #{file}", reason)
end
end
end
defp count_files_to_index(idx) do
idx.root
|> Scanner.new(fn _ -> nil end)
|> Scanner.reduce(0, nil, fn file, acc ->
case get_file_hash(idx, file) do
{:ok, _} -> acc + 1
{:error, :unchanged} -> acc
end
end)
end
defp get_file_hash(idx, file) do
# Files that are missing or have missing indexes must be reindexed.
cond do
!Store.has_summary?(idx.store, file) ->
{:ok, nil}
!Store.has_outline?(idx.store, file) ->
{:ok, nil}
!Store.has_embeddings?(idx.store, file) ->
{:ok, nil}
true ->
existing_hash = Store.get_hash(idx.store, file)
file_hash = sha256(file)
if is_nil(existing_hash) or existing_hash != file_hash do
{:ok, file_hash}
else
{:error, :unchanged}
end
end
end
defp get_outline(idx, file, file_contents) do
res = idx.indexer_module.get_outline(idx.indexer, file, file_contents)
progress_bar_update(:indexing)
res
end
defp get_summary(idx, file, file_contents) do
res = idx.indexer_module.get_summary(idx.indexer, file, file_contents)
progress_bar_update(:indexing)
res
end
defp get_embeddings(idx, file, summary, outline, file_contents) do
to_embed = """
# File
`#{file}`
## Summary
#{summary}
## Outline
#{outline}
## Contents
```
#{file_contents}
```
"""
result = idx.indexer_module.get_embeddings(idx.indexer, to_embed)
progress_bar_update(:indexing)
result
end
defp sha256(file_path) do
case File.read(file_path) do
{:ok, content} -> :crypto.hash(:sha256, content) |> Base.encode16(case: :lower)
{:error, reason} -> {:error, reason}
end
end
# -----------------------------------------------------------------------------
# UI interaction
# -----------------------------------------------------------------------------
defp quiet?(), do: Application.get_env(:fnord, :quiet)
defp spin(processing, func) do
if quiet?() do
{_msg, result} = func.()
result
else
Spinner.run(func, processing)
end
end
defp progress_bar_start(name, label, total) do
if !quiet?() do
Owl.ProgressBar.start(
id: name,
label: label,
total: total,
timer: true,
absolute_values: true
)
end
end
defp progress_bar_end() do
if !quiet?() do
Owl.LiveScreen.await_render()
end
end
defp progress_bar_update(name) do
if !quiet?() do
Owl.ProgressBar.inc(id: name)
end
end
end