yeiichi’s gists

yeiichi / generate_numbers_csv.py

Created May 5, 2026 01:31

Generate a CSV-ready table of number attributes.

	from __future__ import annotations

	from math import isqrt

	# An example for a typical downstream usage is available at the bottom of the page.

	def is_prime(n: int) -> bool:
	if n < 2:
	return False
	if n == 2:

yeiichi / webarchive_to_html.py

Created April 17, 2026 07:56

Extract HTML and resources from an Apple .webarchive file using Python's plistlib

	#!/usr/bin/env python3
	"""
	webarchive_to_html.py

	Extract HTML and resources from an Apple .webarchive file using Python's plistlib,
	then rewrite common resource links for better offline viewing.

	Usage:
	python webarchive_to_html.py input.webarchive
	python webarchive_to_html.py input.webarchive -o output_dir

yeiichi / whitespace_removers.py

Created March 30, 2026 09:05

Remove whitespace from text using different strategies

	import re


	class WhitespaceRemover:
	"""Remove whitespace from text using different strategies.

	All methods remove Unicode whitespace (not just ASCII spaces).
	Choose a method based on readability, performance, and workload size.
	"""

yeiichi / zsh-venv-prompt.zsh

Created March 26, 2026 12:07

Configures a dynamic Zsh prompt that displays the current Python virtual environment name without breaking standard formatting

	# Set up the prompt
	# 1. This MUST be here for the $(...) or ${...} to work
	setopt PROMPT_SUBST

	# 2. Tell the venv script not to mess with the prompt
	export VIRTUAL_ENV_DISABLE_PROMPT=1

	# 3. The prompt string (no spaces inside the parentheses)
	PROMPT='${VIRTUAL_ENV:+(${VIRTUAL_ENV:t}) }%m:%1~ %# '

yeiichi / datetime_util.py

Created March 20, 2026 01:34

Utility helpers for working with timezone-aware datetimes

	"""
	datetime_util.py

	Utility helpers for working with timezone-aware datetimes.

	This module provides:
	- Predefined, commonly used timezone constants (UTC, JST, ET, etc.)
	- Convenience functions for getting the current time in specific regions
	- Safe conversion utilities that enforce timezone awareness
	- ISO 8601 serialization and parsing helpers

yeiichi / num_parser.py

Created March 6, 2026 01:22

Parse a numeric string into int or float

	def parse_number(x: int \| float \| str \| None):
	"""Parse a numeric string into int or float.

	Return None for empty or common null markers; leave non-string inputs unchanged.
	"""
	if not isinstance(x, str):
	return x

	s = x.strip().replace(",", "")

yeiichi / apt-repair-clean.mk

Created February 13, 2026 01:06

Repair and clean apt installed packages

	# 1. Configures unpacked packages
	# 2. Fixes broken dependencies
	# 3. Removes unused packages
	# 4. Clears out the local repository of retrieved package files
	repair-clean: ##
	@sudo dpkg --configure -a && \
	sudo apt install -f && \
	sudo apt autoremove -y && \
	sudo apt autoclean

yeiichi / Makefile_rsync.mk

Last active February 7, 2026 07:06

Selective JSON/JSONL sync with preserved directory structure

	# --- Configuration ---
	SOURCE_DIR := /path/to/src/
	DEST_HOST := host_name_in_ssh_config
	DEST_PATH := /path/to/dest

	# --- Flags ---
	# -a: Archive (preserve permissions/times)
	# -v: Verbose (see what's happening)
	# -z: Compress (faster over network)
	# -R: Relative (ensures directory structure is preserved)/Don't use -> redundant in this context

yeiichi / Mekefie_mysql.mk

Created January 29, 2026 08:19

FreeBSD-friendly Makefile for mysql

	# --- Configuration Constants ---
	DB_HOST ?= mysql.example.com
	DB_NAME ?= dbname
	DB_USER ?= dbuser
	BACKUP_DIR ?= ./backups
	DATE := $(shell date +%Y-%m-%d_%H-%M-%S)

	# Restore settings
	# Usage: make restore RESTORE_FILE=./backups/xxx.sql.gz
	RESTORE_FILE ?=

yeiichi / dataframe_stripper.py

Created January 15, 2026 07:17

Strip leading and trailing whitespace from DataFrame string cells, leaving other types unchanged

	def strip_df(df):
	"""Strip leading and trailing whitespace from DataFrame string cells, leaving other types unchanged."""
	return df.map(lambda s: s.strip() if isinstance(s, str) else s)

Eiichi YAMAMOTO yeiichi