Dima 4mitch

Epigrams on Programming

Alan J. Perlis, Yale University

This text has been published in SIGPLAN Notices Vol. 17, No. 9, September 1982, pages 7 - 13. I'm offering it here online until ACM stops me.

The phenomena surrounding computers are diverse and yield a surprisingly rich base for launching metaphors at individual and group activities. Conversely, classical human endeavors provide an inexhaustible source of metaphor for those of us who are in labor within computation. Such relationships between society and device are not new, but the incredible growth of the computer's influence (both real and implied) lends this symbiotic dependency a vitality like a gangly youth growing out of his clothes within an endless puberty.

The epigrams that follow attempt to capture some of the dimensions of this traffic in imagery that sharpens, focuses, clarifies, enlarges and beclouds our view of this most remarkable of all mans' artifacts, the computer.

Clojure REPL in java

Dependencies

<dependencies>
  <dependency>
    <groupId>org.clojure</groupId>
    <artifactId>clojure</artifactId>
    <version>1.8.0</version>

Atom Clojure Setup

This describes how I setup Atom for an ideal Clojure development workflow. This fixes indentation on newlines, handles parentheses, etc. The keybinding settings for enter (in keymap.cson) are important to get proper newlines with indentation at the right level. There are other helpers in init.coffee and keymap.cson that are useful for cutting, copying, pasting, deleting, and indenting Lisp expressions.

Install Atom

Download Atom

The Atom documentation is excellent. It's highly worth reading the flight manual.

Howto: Install Alpine Linux 3.3 on VirtualBox OSX

Latest Standard ISO version x86_64 is recommended (http://alpinelinux.org/downloads/)
Create new VM ("Linux 2.6 / 3.x / 4.x (64-bit)")
1 CPU w/ 512BM RAM and 1 GB default (VDI) disk is more than sufficient
Default networking (NAT)
Boot and add Alpine ISO as attached virtual install media
Default root password is blank (though note - ssh PermitRootLogin defaults to disallow blank passwords and: prohibit-password; switch to yes for Host ssh)
Run setup-alpine
Defaults are fine, but you do want "sys" disk setup to sda, y to confirm

	package nl.avisi.jira;

	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;
	import org.springframework.beans.factory.DisposableBean;
	import org.springframework.beans.factory.InitializingBean;

	import com.atlassian.jira.component.ComponentAccessor;

	import clojure.java.api.Clojure;

	XPath ::= Expr
	ParamList ::= Param ("," Param)*
	Param ::= "$" EQName TypeDeclaration?
	FunctionBody ::= EnclosedExpr
	EnclosedExpr ::= "{" Expr "}"
	Expr ::= ExprSingle ("," ExprSingle)*
	ExprSingle ::= ForExpr
	\| LetExpr
	\| QuantifiedExpr
	\| IfExpr

	# ------------------------------------
	# Docker alias and function
	# ------------------------------------

	# Get latest container ID
	alias dl="docker ps -l -q"

	# Get container process
	alias dps="docker ps"

	// Based on Chris Webb's blog post - http://blog.crossjoin.co.uk/2014/05/21/expanding-all-columns-in-a-table-in-power-query/

	let
	//Define function taking two parameters - a table and an optional column number
	Source = (TableToExpand as table, optional ColumnNumber as number) =>
	let
	//If the column number is missing, make it 0
	ActualColumnNumber = if (ColumnNumber=null) then 0 else ColumnNumber,
	//Find the column name relating to the column number
	ColumnName = Table.ColumnNames(TableToExpand){ActualColumnNumber},

	=> (clojure.core.server/start-server {:name "debug connection" :port 5555 :accept 'clojure.core.server/repl})
	#object[java.net.ServerSocket 0x631883f0 "ServerSocket[addr=localhost/127.0.0.1,localport=5555]"]