smorin
I am looking for a way to read in a elixir module and replace functions with code you want to run. Anyone know of any examples of code on how to parse a module’s AST to match against a function and replace it?
See example here: GitHub - smorin/BootstrapEx · GitHub
path = “lib/test_module.ex”
path
|> File.read!()
|> Code.string_to_quoted()
|> Insert.print()
path = “some_path”
path
|> get_file
|> get_ast
|> replace_function_that_matches_name
|> ast_to_string
|> string_to_file
|> format_file
Where Next?
Trending in Questions
Other Trending Topics
Latest on Elixir Forum
Sponsor Spotlight
Supporting innovation across the BEAM ecosystem.
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #deployment
- #library
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #discussion
- #code-sync
- #javascript
- #podcasts
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #blog-post
- #elixir-ls
- #ai
- #elixirconf-us
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #api
- #forms
- #hex
- #security
- #metaprogramming
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Error tracking, logs, uptime, and Just Enough APM. Built for developers.
Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!
Master modern tools, write cleaner code, and tackle real-world challenges.
Enabling companies to succeed by building software people love.
The deployment platform built for Elixir: PaaS ease, VPS control.
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"
Showing Posts 1 to 4- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
chvanikoff
TLDR: you can do this, but you can’t preserve code formatting, comments and other stuff which is not part of AST. I’ve been investigating a similar case here: Mix deps.add functionality - #3 by chvanikoff
smorin
Thanks, formatting I don’t care about but want to support comments. Not having that sucks.
smorin
Checked out your thread and actually was looking to do the same thing. Maybe we can suggest adding comments to the AST.
Eiji
I don’t believe that’s good idea. Even if we would still not have formatting saved. I think that looking at
formattermix task may give more ideas, because it’s actually do not remove comments when changing file.