The assigns from metagn

assigns's Introduction

If you want to support my work please consider sponsoring (no fees) or donating via Buy Me a Coffee. Being a student in Turkey, any amount means a lot.

Links

Sponsor
Buy Me a Coffee - another way of donating alongside sponsoring
Codewars - ranked in many languages, highest ranked in order are Ruby, Julia, Python, Rust, Nim, Java, Groovy, C++, Crystal

Projects I'm currently working on/intend to maintain:

Projects
Nim	personal contributions to the Nim programming language
margrave	Markdown dialect
abyzou	in development scripting language
Nim libraries	see below

Nim libraries

Nim libraries	installable with nimble (`nimble install <url>`)
applicates	first-class templates/symbols
knot	tie compile-time values to types under names
margrave	portable and configurable parser for a markdown dialect
nuance	runtime nim AST generation with line info for later compilation
lispnim	lisp syntax for nim using nuance
grab	inline package installs (like Groovy @Grab)
assigns	overloadable pattern matching
sliceutils	slice/range abstractions
skinsuit	stackable utility macros for object variants
spread	block syntax for calls/literals/constructors
dirtydeeds	sugar for partially applied calls
shorteststring	word-size string
etf	erlang term format
niv/websocket.nim	(co-maintainer)
funnycapitalism	(inactive) barebones Discord library
nashorn	(inactive) nim wrapper for Nashorn JS runtime on the JVM
nimedscript	(inactive) nim wrapper for EdisonScript in FL Studio

* bold: on the nimble package registry, can be installed with nimble install <name>

Other past projects (archived or sporadically maintained):

other		date
kismet	first programming language, for embedding in the JVM	2016-
fup1	tetris for web and desktop using SDL2 in Nim	2021
wobby	2D platformer engine and level editor in Groovy/Swing	2017-2018
technocracy	starter demo for a game idea I had in Groovy/Swing	2018
DiscordG	early wrapper for the Discord bot API in Groovy	2016-
lolhr	Discord bot account client to learn JavaFX	2018

assigns's People

Contributors

Stargazers

Watchers

assigns's Issues

use result type with AssignError instead of raising it for matching

custom example not working for me (error on ?x)

Hi, nice work.
I was testing the examples in the readme and found an issue with last (custom type) example:

import definesugar

type Result[T] = object
  case success: bool
  of true:
    value: T
  else:
    error: ref Exception

import macros
macro define[T](lhs; rhs: Result[T]): untyped =
  if lhs.kind == nnkPrefix and lhs[0].eqIdent"?":
    let tmp = genSym(nskLet, "tmpResult")
    # openDefine means use any custom overload of define for the rest
    let asgn = openDefine(lhs[1], newDotExpr(tmp, ident"value"))
    result = quote do:
      let `tmp` = `rhs`
      if not `tmp`.success:
        raise `tmp`.error
      `asgn`
  else:
    # defaultDefine is a proc(NimNode, NimNode): NimNode and is what is applied by default if no overload is found
    result = defaultDefine(lhs, rhs)

let successful = Result[int](success: true, value: 5)
?x := successful
echo x # 5