fcce

#!/usr/bin/env ruby
require 'open3'

def branch_exists?(branch_name)
  o, s = Open3.capture2("git rev-parse --verify #{branch_name}")

  s.success?
end

def write_credentials_to_file(credentials_path, key_path, target_path)

fcce

- a 形容词  
	- ad 副形词  
	- ag 形容词性语素  
	- an 名形词  
- b 区别词  
- c 连词  
- d 副词  
	- df   
	- dg 副语素  
- e 叹词  

fcce

单机多用户 JupyterLab 环境搭建

概述

在这篇短文中，我们记录了如何在使用 [Ubuntu][] 1804 LTS 操作系统的单台服务器上，建立用户隔离的 [JupyterLab][] Web 环境。

目标是：

• 操作系统的用户可以各自不受干扰的使用独立的 [JupyterLab][]
• 各个用户的 [Conda][] 环境可以自动的出现在 [JupyterLab][] 的 Kernel 列表中

fcce

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

fcce

package main

import (
	"fmt"
	"time"
)

// Suggestions from golang-nuts
// http://play.golang.org/p/Ctg3_AQisl

fcce

1. Install pre-requisities

sudo apt-get install build-essential tcl

2. Install Redis

cd /tmp
curl -O http://download.redis.io/redis-stable.tar.gz
tar xzvf redis-stable.tar.gz

fcce

# Yay! High voltage and arrows!

prompt_setup_pygmalion(){
  ZSH_THEME_GIT_PROMPT_PREFIX="%{$reset_color%}%{$fg[green]%}"
  ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%} "
  ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg[yellow]%}⚡%{$reset_color%}"
  ZSH_THEME_GIT_PROMPT_CLEAN=""

  base_prompt='%{$fg[yellow]%}%n%{$reset_color%}%{$fg[cyan]%}@%{$reset_color%}%{$fg[yellow]%}%m%{$reset_color%}%{$fg[red]%}:%{$reset_color%}%{$fg[cyan]%}%0~%{$reset_color%}%{$fg[red]%}|%{$reset_color%}'
  post_prompt='%{$reset_color%}%{$fg[red]%}❯%{$reset_color%}%{$fg[yellow]%}❯%{$reset_color%}%{$fg[green]%}❯%{$reset_color%}%b '

fcce

require 'active_record/relation.rb'
module ActiveRecord
  # = Active Record \Relation
  class Relation
    private
    def exec_queries(&block)
      # 如果没有排序且没有 select 任何字段 添加默认主键排序
      order(arel_attribute(primary_key)) if order_values.empty? && select_values.empty?

fcce

# postgre 实现 partition
CREATE TABLE measurement (
    id         int not null PRIMARY KEY,
    logdate         date not null,
    peaktemp        int,
    unitsales       int
);

CREATE TABLE measurement_y2006 ( ) INHERITS (measurement);
CREATE TABLE measurement_y2005 ( ) INHERITS (measurement);

fcce

class CoordConvert
  class << self
    PI = 3.14159265358979324
    X_PI = PI * 3000.0 / 180.0 #圆周率转换量
    ## Krasovsky 1940
    ## a = 6378245.0, 1/f = 298.3
    ## b = a * (1 - f)
    ## ee = (a^2 - b^2) / a^2
    A = 6378245.0 #椭球体的长半轴半径
    EE = 0.00669342162296594323 #椭球体的第一偏心率