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
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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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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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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I’m working on a cool library (news about that in a few weeks :smiley:), and there’s no sugar coating this: I really want to use inherita...
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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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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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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’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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I wanted to create a way to “safely” evaluate a string containing Elixir code. The code in the string should not be allowed to use any fu...
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Hi,
I’m trying to create some syntactic sugar through a macro. The basic function should look like the following:
f :name do
data.som...
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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...
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’m trying to identify function calls. My current solution seems to be working, but I’m not sure what are the edge cases I should test fo...
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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
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...
New
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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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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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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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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In iex, this I can do this:
quote do
unquote(%{})
end
And get the expected:
%{}
But for some reason, in the macro I’m working on...
New
I’m using the __using__ macro to define some boilerplate code. One of the functions defined in the macro is a different arity of a functi...
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