Latest #macros Threads 
I have a macro that expands into a module definition. The use case is that we take a testcase defined in one elixir module (parent) and m...
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I’ve been heavily working with macros for more than 10 years already and I always used kinda ad-hoc code to expand/debug/test those when ...
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I want to model the following relationship:
A location has zero or one of multiple (currently 7) specifications (each specification is a...
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No they are not (not necessarily, at least.)
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Hey folks,
I made a tiny macro that lets you assign a piped value to a variable without breaking the flow. For example:
data
|> tran...
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iex(25)> quote do
...(25)> 1 |> rem(2) |> div(4)
...(25)> end |>
...(25)> Macro.expand(__ENV__) |>
...(25)> Ma...
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Hi!
I have a piece of code that parses some json and creates validations from them. In one place, I need to create a regular expression ...
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I have a macro that is used for parsing:
defmacro left <~> right do
quote do
case unquote(left) do
:error ->...
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I have some AST rewriting code (using Sourceror) that has started failing in Elixir 1.18 – I believe because unquote has become stricter ...
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Hi,
I’m experimenting with macros to create a framework for defining a sort of tests.
I’m trying to figure out how to create a graph of...
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Hi there,
After reading @ericmj response here (Using unquote outside of quote block - #6 by ericmj) about “unquote fragments”, I still c...
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I’ve been heavily working with macros for more than 10 years already and I always used kinda ad-hoc code to expand/debug/test those when ...
New
I have a macro that expands into a module definition. The use case is that we take a testcase defined in one elixir module (parent) and m...
New
I want to model the following relationship:
A location has zero or one of multiple (currently 7) specifications (each specification is a...
New
Last Three Year's Trending
It is rare to use direct calls to send in elixir. The call is normally wrapped in a function which is responsible for sending the correct...
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I can dynamically define functions in a “loop” like this:
defmodule Foo do
for {f, i} <- [{:foo, "foo"}, {:bar, "bar"}] do
def ...
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Can Elixir code detect whether it is executing at compile time? I would like to write something like the following macro:
defmacro foo()...
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Hey y’all so i’m working on a project that takes in Ecto schema and generates JSONSchemas for them. Part of the project requires that the...
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I am trying to define a macro that defines a render(assigns) function but the compiler keeps rejecting the sigil, claiming that no assign...
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Summary
I am currently trying to get a better understanding of elixir macros and in doing so encountered the section about dynamic querie...
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I’m currently writing a specie of DSL and I’m trying to understand how can I escape an anonymous function in a module attribute. I’m not ...
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Hey folks,
I made a tiny macro that lets you assign a piped value to a variable without breaking the flow. For example:
data
|> tran...
New
Hello all,
I need to convert AST with possible long binary to string.
Macro.to_string() uses Inspect and Inspect has the printable_limi...
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I have a question regarding a code snippet from part 6 of a really great Macros guide by @sasajuric.
This question specifically ranges f...
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Hex: bin_struct | Hex
Git: GitHub - 4ait/bin_struct · GitHub
Docs: bin_struct v0.2.34 — Documentation
BinStruct is a library which mai...
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After reading Metaprogramming Elixir, and the hexdocs on metaprogramming and macros, I was wondering how this ties into macros we use eve...
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I’m trying to build a macro for edge definitions in a graph. How can I access parameters from the outer macro inside the inner macro?
T...
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I’m trying to implement template fragments in EEx. My extremely rough draft lets you create a template file that looks like this:
<%|...
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Hi everyone
Not sure if this is usable and/or interesting, but I have been working on a pet project of mine, that in lack of better fant...
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Trending Over Three Years
Currently I am writing a small macro which adds authorization functionality to a function. Rewrite ‘def’ to ‘defprot’ and add the rules t...
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This is a bit of a “strange” question but please bare with me; I expect it will be useful/insightful to others learning Elixir/Phoenix wa...
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Hi,
I am writing the Elixir integration for AppSignal, an application metrics solution. As of such, I am looking for a way to decorate f...
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In a macro, can you access a module attribute outside quote?. I know about Module.get_attributes/2 but I can only get it to work inside ...
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Do you think theres a way to write a function that matches a list of patterns with a list of values ignoring order? We use UXID and inser...
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I have been updating a library that allows you to pipe between functions that use the erlang result tuple convention.
Assuming you have ...
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Hi,
When writing the following code, elixir correctly and thankfully warns that there is a conflict:
function/macro 1:
defmacro static...
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I’ve forked an abondoned hex-package and continue to maintain it under a new name.
The old code-base does provide a macro that we call f...
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Hi everyone, I was toying around with macros today and I reached a stagnation point. After trying multiple approaches I started to think ...
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Hi community!
What is the correct way to implement the __using__ macro with an option that changes the way generated functions behave? O...
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Certain kinds of algorithms can be sped up (or even: are only possible) by using cyclic data structures.
Functional languages make it ha...
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This morning, I came to a sudden realization: Elixir’s Macro system is even more powerful than I’d thought.
My mind is blown.
Let me tr...
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I’m trying to do something similar to wath ecto does when defining schemas. Basically the idea is:
defmodule Test do
use TableBuilder
...
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Hi.
I am making a library for user submitted templates (so users can customize email content). I have a parser which parses the template...
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I’m trying to implement a conceptual test with the following macro. I want to be able to pass an action argument which will call a funct...
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