Leedehai

Clang with libc++

TL;DR: On macOS you are fine, if you didn't tweak its default compiler toolchain. If you did tweak it (e.g. use Clang downloaded from its official source or with a package manager), or if your OS is Linux, read below.

The C++ standard library has many well-maintained implementations, chief of them LLVM's libc++ and GNU's libstdc++. The standard library, including the headers and the binary itself, usually come with the downloaded compiler package: libc++ is with Clang and libstdc++ is with GCC.

Supporting dark mode

Using vanilla HTML, CSS, JavaScript, on a static site.

Credit: Ryan Feigenbaum.

Developers love dark mode, especially during the night. Supporting dark mode on the page is not only beneficial, but also arguably imperative, given that human eyes don't handle sudden change in brightness well.

This guide applies if you want to override/create the icon for an application on Ubuntu.

Terminator is a popular terminal emulator that comes with a handy screen-split feature if you are not comfortable with the classic tmux solution. However, one thing of Terminator that put me off is its dark-red icon -- it feels so out of place with the rest of the icons in the side bar! In contrast the icon of Ubuntu's own Terminal app has an arguably sleekier look that fits very neatly with neighbors. Fortunately though, Ubuntu allows replacing the icon.

Step 1

Copy Terminator's *.desktop file into your home directory's ~/.local/share/applications:

	<!-- The boilerplate for HTML5 canvas painting. View in browser.
	How to use: create canvas.js in the same directory and get the
	canvas object by the element id "canvas". Draw on the canvas.
	-->
	<html translate="no">

	<head>
	<title>Canvas sketching</title>
	<meta name="google" content="notranslate">
	<style>

	#!/usr/bin/env python3

	import os, sys
	from enum import Enum, unique
	from typing import Optional

	@unique
	class ProgressBarColor(Enum):
	BLUE = "\x1b[38;5;75m"
	PINK = "\x1b[38;5;203m"

	#!/usr/bin/env python
	# Ported to Python from http://www.vim.org/scripts/script.php?script_id=1349

	print("xterm-256color color set\n")

	colored = [0] + [0x5f + 40 * n for n in range(0, 5)]
	colored_palette = [
	"%02x%02x%02x" % (r, g, b)
	for r in colored
	for g in colored

	#!/usr/bin/env python3

	# Python 3.7+

	import multiprocessing.dummy as mp # Threading wrapped using multiprocessing API.
	import os
	import queue
	import socket
	import socketserver
	import sys

	// Static server that mimics GitHub Pages.

	import chalk from 'chalk';
	import express from 'express';
	import * as fs from 'fs';
	import http from 'http';
	import path from 'path';
	import {fileURLToPath} from 'url';

	const __dirname = path.dirname(fileURLToPath(import.meta.url));

	// [depdendencies]
	// backtrace = "0.3" # https://docs.rs/crate/backtrace/latest

	fn backtrace(level: usize) {
	let (trace, curr_file, curr_line) = (backtrace::Backtrace::new(), file!(), line!());
	let symbols = trace
	.frames()
	.iter()
	.flat_map(backtrace::BacktraceFrame::symbols)
	.skip_while(\|s\| {

	# $PATH and its friends.
	# If a program is invoked from this terminal, then all environment variables
	# (including $PATH) are visible to that program.
	# Use "append_if_new PATH foo/bar" to append path "foo/bar" to $PATH so we avoid
	# duplication -- if executables with the same name exist in multiple paths
	# enumerated in $PATH (e.g. caused by "source ~/.zshrc" multiple times), then
	# the first find wins anyway.
	append_if_new() {
	local variable_name="$1"
	local new_item="$2"