tkfm-yamaguchi’s gists

tkfm-yamaguchi / flatten_with_loop.rb

Last active December 28, 2018 00:17

flatten with loop (no recursion)

	class Array
	# flatten without recursion but loop
	def myflatten!
	i = 0

	while i < self.size
	unless self[i].is_a?(Array)
	i += 1
	next
	end

tkfm-yamaguchi / recover-file-removed.sh

Created December 27, 2018 00:13

recover removed file

-sudo grep -i -a -B 100 -A 100 'string' /dev/sda1 > file.txt
-# or
-# sudo grep -F -a -C 100 'string' /dev/sda1 > file.txt
-# ref:
-# https://unix.stackexchange.com/questions/2677/recovering-accidentally-deleted-files

tkfm-yamaguchi / apt-redis-issue.md

Created December 12, 2018 01:27

Can't upgrade/purge redis server on Debian/Ubuntu (apt adapting distros)

Situation

The reason for the failure of both apt command above is something is timeout.

tkfm-yamaguchi / all_coords_vtk_uniq.rb

Last active November 21, 2018 09:02

a ruby method to detect x-y coords uniquness of points in VTK file

	# Detects whether the x/y coordinates of points in VTK are all different.
	#
	# @params {string} vtk path to VTK file
	# @return {boolean}
	def all_coords_uniq?(vtk)
	File.open(vtk, "r") do \|f\|
	points_count = 0
	while line = f.gets.chomp
	if line =~ /^POINTS/
	points_count = line.split[1].to_i

tkfm-yamaguchi / rubocop_emacs_formatter_expansion.rb

Created November 15, 2018 05:01

formatter for rubocop: output relative path with emacs style

	module RuboCop
	module Formatter
	class EmacsStyleFormatter < BaseFormatter
	def file_finished_with_relative_path(file, offenses)
	path = Pathname(file).relative_path_from(Pathname.pwd).to_s

	file_finished_without_relative_path(path, offenses)
	end

	alias file_finished_without_relative_path file_finished

tkfm-yamaguchi / index.html

Created November 7, 2018 01:49

A prototyping starter set for React

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<title>Prototping with React</title>
	</head>
	<body>
	<div id="app"></div>

	<script crossorigin src="https://unpkg.com/react/umd/react.development.js"></script>

tkfm-yamaguchi / cb.py

Created October 22, 2018 07:10

CodingBat in Python

	# https://codingbat.com/python/List-1
	# https://codingbat.com/python/Logic-1
	# https://codingbat.com/python/Logic-2
	# https://codingbat.com/python/String-2
	# https://codingbat.com/python/List-2

	def cigar_party(cigars, is_weekend):
	if is_weekend:
	return cigars >= 40
	else:

tkfm-yamaguchi / string.rb

Last active October 16, 2018 07:42

ruby's string class extension conting the length of multi-byte string as 2

	class String
	# number of characters where the multi-byte string is counted by 2
	def mbsize
	chars.sum{\|str\| str.bytesize == 1 ? 1 : 2 }
	end

	def mbljust(num, char=" ")
	return self if mbsize > num

	self + char * (num - mbsize)

tkfm-yamaguchi / ping_with_decimal_number.rb

Last active June 19, 2018 01:43

ping に10進数を指定したときの挙動についての確認スクリプト

	# == ping プログラムの(?)仕様についての確認スクリプト
	#
	# $ ping 2915182161
	#
	# を実行すると,
	#
	# $ ping 173.194.38.81
	#
	# を実行したのと同じように扱われる. これは ping が引数をドット(`.`)を桁区切りとする 256 進数と同値であるため.
	# 以下は, 2915182161 (10進数) が 173.194.38.81 (256進数) と同値であることを示すスクリプト.

tkfm-yamaguchi / result.txt

Last active May 21, 2018 14:41

It would be nil (local variable) when a method is substituted by itself in Ruby