haxscramper

#!/usr/bin/env fish


function find-match-in-parent-dir -a "find_match"
    set -l path "$PWD"
    while [ '/' != "$path" ]
        find "$path" -maxdepth 1 -mindepth 1 -name "$find_match"
        set path (readlink -f "$path/..")
    end
end

haxscramper

import std/[os, strformat]
import Nim / compiler /
  [ idents, options, modulegraphs, passes, lineinfos, sem, pathutils, ast,
    astalgo, modules, condsyms, passaux
  ]

let file = "/tmp/ee.nim"

file.writeFile("""
proc test*(arg: int) = echo arg

haxscramper

Language & VM design

Lexing & parsing

Articles

• Parsing inputs in Nim

Writing own parser

haxscramper

Nim features you didn’t know and don’t need to

Can put basically anything as identifier

Technically this is just function call using method call syntax - × is treated as regular identifier (like someFunction) and it is perfectly legal to call obj .someFunction arg. So a .× b is not really different in that regard.

proc ×(a, b: set[char]): seq[(char, char)] =
  for aIt in a:
    for bIt in b:

haxscramper

import asynchttpserver, asyncdispatch, os


proc handler(req: Request) {.async.} =
  echo "request for path ", req.url.path
  let cwd = getCurrentDir()
  let file = cwd / req.url.path
  if fileExists(file):
    await req.respond(Http200, file.readFile())
  else:

haxscramper

Pattern matching in nim

Introduction

New pattern matcing library introduces support for two very useful concepts: pattern matching and object destructuring.

haxscramper

Base C++ class cppbase.cpp

#pragma once

#include <stdio.h>

struct CppBase {
  virtual void baseMethod(int arg) {
    printf("arg from nim - %d -\n", arg);

haxscramper

Nim fusion

Starting from this version you can run nim fusion to install or update the fusion package - an extension to the nim stdlib with some additional modules.

Currently, the following modules are present:

• fusion/smartptrs - C++-like unique/shared pointers
• fusion/btreetables - sorted associative containers
• fusion/matching - pattern matching implementation using nim macros
• introduction article: https://nim-lang.org/blog/2021/01/11/pattern-matching.html

haxscramper

• PR
  • const now works with ref types #15528
  • more informative FieldError msg report discriminant value + lineinfo;
  • nim-lang/RFCs#398
• RFC
  • Allow unchecked assign to discriminant fields #407
  • Multiple usages of the case discriminator for case objects #368
  • User-defined implicit initialization hooks #252
• execution traces (eg for code coverage, debugging, introspection) #15827

haxscramper

Cleaning up existing tests

There are many ideas of what we could change or where to go next, but those are often poorly thought out. The sheer volume of what we don't know about the existing system, good or bad, is so large we're working in the dark. This is a blindspot induced by the current state of the code base.

What we do know, with great certainty, is that we need tests that not only test things but also:

• teach the reader
• are a useful reasoning tools
• remember decisions of the past
• help uncover lost ideas
• shine a light on dark corners and issues