paincompiler

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paincompiler

Reader Macros in Common Lisp

This post also appears on lisper.in.

Reader macros are perhaps not as famous as ordinary macros. While macros are a great way to create your own DSL, reader macros provide even greater flexibility by allowing you to create entirely new syntax on top of Lisp.

Paul Graham explains them very well in [On Lisp][] (Chapter 17, Read-Macros):

The three big moments in a Lisp expression's life are read-time, compile-time, and runtime. Functions are in control at runtime. Macros give us a chance to perform transformations on programs at compile-time. ...read-macros... do their work at read-time.

paincompiler

import "math/big"

// simulate python 2.7 built-in __hash__ of string object
func hash(s string) *big.Int {
	if len(s) == 0 {
		return big.NewInt(0)
	}
	value := big.NewInt(int64([]byte(s)[0]) << 7)
	for _, v := range []byte(s) {
		value = value.Xor(value.Mul(value, big.NewInt(1000003)), big.NewInt(int64(v)))

paincompiler

# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

paincompiler

Client-Server Model Based Dev Guide

References

Go through

Client-Server Model wiki

Web Server wiki

paincompiler

osascript -e "set volume input volume 100"

# Check every minute for mic input < 100%; if it is, dial it up elegantly
* * * * * while (( `osascript -e "input volume of (get volume settings)"` < 100 )); do osascript -e "set volume input volume (input volume of (get volume settings) + 3)"; sleep 0.1; done;