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metastatic
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Cross-language code meta-model library using unified MetaAST representation. Parse, transform, and translate code across Python, Elixir, Ruby, Erlang, Haskell, and more via a shared three-tuple AST format.
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lib/mix/tasks/metastatic.code_smells.ex
defmodule Mix.Tasks.Metastatic.CodeSmells do
@shortdoc "Detects code smells"
use Mix.Task
@dialyzer {:no_return, run: 1}
alias Metastatic.Analysis.Smells
alias Metastatic.Builder
def run(args) do
{opts, files, _} = OptionParser.parse(args, strict: [format: :string, language: :string])
case files do
[] ->
Mix.shell().error("Usage: mix metastatic.code_smells FILE")
exit({:shutdown, 2})
[file | _] ->
analyze(file, opts[:language], opts[:format] || "text")
end
end
defp analyze(file, language, format) do
unless File.exists?(file),
do:
(
Mix.shell().error("File not found")
exit({:shutdown, 2})
)
source = File.read!(file)
lang = language || detect_lang(file)
case Builder.from_source(source, String.to_atom(lang)) do
{:ok, doc} ->
{:ok, result} = Smells.analyze(doc)
output =
if format == "json",
do: Jason.encode!(Smells.Result.to_map(result), pretty: true),
else: result.summary
Mix.shell().info(output)
exit({:shutdown, if(result.has_smells?, do: 1, else: 0)})
{:error, reason} ->
Mix.shell().error("Parse error: #{inspect(reason)}")
exit({:shutdown, 2})
end
end
defp detect_lang(file) do
case Path.extname(file) do
".py" ->
"python"
".ex" ->
"elixir"
".exs" ->
"elixir"
".erl" ->
"erlang"
".rb" ->
"ruby"
".hs" ->
"haskell"
_ ->
Mix.shell().error("Cannot detect language")
exit({:shutdown, 2})
end
end
end