Hi, Please consider you have a project in GitHub and before running and getting it with mix deps task you want to get some basic information like what is the version and name of this library from mix.exs file. So regex is not a good way because some people put version as global variable like @versi…

Code.eval_string is not safe. I’d suggest Code.string_to_quoted

[image] hst337: Code.string_to_quoted Thank you, it converts AST, right? So after that, how can I run this module with a random name because it is possible there is a module same name. [image] shahryarjb: So regex is not a good way because some people put version as global variable like @…

You can just travese AST with functions provided in macro. You should look for field version in project funcion. If it contains, @version, than look for @version attirbute. If it contains something else, than there’s no safe way to fetch a version without executing code defined in this module

Hi, I want to get some value from a module which is AST, and why I want to do this you can see this post Getting basic information of an elixir project from GitHub . for example I have something like this: code = """ defmodule MishkaDeveloperTools.MixProject do use Mix.Project @version "0.0.7" …

I could be able to get values with this: {:ok, ast} = Code.string_to_quoted(code) Macro.postwalk(ast, fn {:def, _line, [{:project, _, _}, [do: fun]]} -> {Keyword.get(fun, :app), Keyword.get(fun, :version)} v -> v end) But how can access just this tuple? {Keyword.get(fun, :app), Keyword.get(fun…

The AST of a keyword list is not a keyword list by itself, so you cannot use Keyword to access things. AST is an abstraction of written code, and not of the data represented by that code. You’ll need more manual approaches for filtering out the information you need. A rather naive appraoch to getti…

[image] LostKobrakai: What you’re doing here is very brittle, as you’re trying to interpret code without running it, which can easily break by someone not sticking to conventions closely. Thank you, but do you have any suggestion? Because I need to get some basic information about the dep the…

[image] shahryarjb: Thank you, but do you have any suggestion? Because I need to get some basic information about the dep they want to install and after that I pass this operation to Mix deps.get No. There’s no safe way to do that for all possible mix.exs files. Mix itself doesn’t use version…

Dear @LostKobrakai , do you have any tutorial especially in elixir to learn work with AST, I am thinking if I had no access to internet I could not solve this problem! I have read Metaprogramming Elixir: Write Less Code, Get More Done (and Have Fun!) by Chris McCord book

Metaprogramming · Elixir School Macro — Elixir v1.20.2 [image] Metaprogramming Elixir Use macros to extend the Elixir language with fast, maintainable code, and share functionality in ways you never thought poss…

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Getting basic information of a elixir project from GitHub

Questions & Help Questions

LostKobrakai June 7, 2022, 8:43am 11