Jim Fisher jameshfisher

## gist:77799ca0d96f5d475f1e
<!DOCTYPE HTML>
<html><head><meta charset="UTF-8"><title>Compiled Elm</title><style>html,head,body { padding:0; margin:0; }
body { font-family: 'Lucida Grande','Trebuchet MS','Bitstream Vera Sans',Verdana,Helvetica,sans-serif; }
a {
  color: #1184CE;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
  color: rgb(234,21,122);

## splunk_enterprise_download_urls.md

      
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                / splunk_enterprise_download_urls.md
            
            
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              August 29, 2015 14:04
            
              
                Splunk Enterprise download URLs
              
          
    NOT THIS: http://www.splunk.com/page/download_track?file=6.1.2/splunk/linux/splunk-6.1.2-213098-linux-2.6-x86_64.rpm
THIS:     http://download.splunk.com/products/splunk/releases/6.1.2/splunk/linux/splunk-6.1.2-213098-linux-2.6-x86_64.rpm

i.e. take the file argument and prefix it with http://download.splunk.com/products/splunk/releases/
Works for:

6.1.2/splunk/linux/splunk-6.1.2-213098-linux-2.6-x86_64.rpm
6.1.2/universalforwarder/linux/splunkforwarder-6.1.2-213098-linux-2.6-x86_64.rpm
...


## restore-file-from-package.sh
#!/bin/bash

# Usage:
#
#     sudo ./restore-file-from-package.sh <filepath>
#
# Restore a file from the package that provides it.
#
# Source: http://askubuntu.com/a/67028/30482

## ORM_constraints.md

      
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                jameshfisher
                / ORM_constraints.md
            
            
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              January 4, 2016 12:59
            
              
                ORM correctness constraints
              
          
    ORM correctness constraints

At an old workplace, we used the Hibernate ORM to map a class hierarchy to our relational database.
Hibernate represents a class hierarchy in the following way.
Let's say we have the tables:
abstract class A
class B extends A
class C extends A


## How to make a private Gist public.md

      
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                jameshfisher
                / How to make a private Gist public.md
            
            
              Created
              January 5, 2014 16:31
            
              
                How to make a private Gist public
              
          
    Github provides no facility to do this via the UI. This is sad, because it would be extremely useful in order to draft something before publishing it. It would also be trivial for them to implement. Never mind; here's how to do it manually:

Get the "Clone this Gist" text from the left-hand side of the private Gist, e.g. https://gist.github.com/b9cc265982870c091a1e.git, and extract the ID b9cc265982870c091a1e.
Go to https://gist.github.com/ and create a dummy new public Gist.
Get the "Clone this Gist" text from the left-hand side, e.g. https://gist.github.com/8270253.git, and extract the ID 8270253.
git clone git@gist.github.com:b9cc265982870c091a1e tmp-dir && cd tmp-dir && git push -f git@gist.github.com:8270253.git


## Javaland.md

      
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                / Javaland.md
            
            
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              January 2, 2016 07:29
            
              
                Javaland
              
          
    An introduction to Javaland

Javaland is notorious for its acronyms, inconsistent and redundant naming, bundling of multiple things into new definitions, circular definitions, and so on.
This file aims to reduce this incomprehensible mess into a set of succinct definitions. This should read like a dictionary, where all definitions only refer to prior definitions.
The JVM

Java bytecode refers to two things:

  
## halting_problem_javascript.md

      
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                jameshfisher
                / halting_problem_javascript.md
            
            
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              September 7, 2017 01:04
            
              
                A proof that the Halting problem is undecidable, using JavaScript and examples
              
          
    Having read a few proofs that the halting problem is undecidable,
I found that they were quite inaccessible,
or that they glossed over important details.
To counter this, I've attempted to re-hash the proof using a familiar language, JavaScript,
with numerous examples along the way.
This famous proof tells us that there is no general method
to determine whether a program will finish running.
To illustrate this, we can consider programs as JavaScript function calls,
and ask whether it is possible to write a JavaScript function which will tell us

  
## PHP_semantics.md

      
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              April 18, 2023 14:53
            
              
                Semantics for PHP
              
          
    PHP semantics

Motivation

PHP is usually included in the top five or six most popular programming languages,
as measured by various metrics implemented by e.g. [Tiobe][], [LangPop][], [PYPL][], [lang-index][].
Alongside it sit C, Java, Obj-C, C++, C#, Javascript, and Python.
All of these have a formal semantics or at least a rigorous specification.

  
## NinetyNine.hs
module NinetyNine where

import Data.List (foldl')

-- Problem 1: Find the last element of a list.
myLast :: [a] -> a
myLast [] = error "myLast []"
myLast (x:xs) = foldl' (flip const) x xs

-- Problem 2: Find the last but one element of a list.

## rust_0.2_compile_segfault.bash
james@bast:~$ cd /tmp/
james@bast:/tmp$ tar -xvf rust-0.2.tar.gz
rust-0.2/
rust-0.2/Makefile.in
rust-0.2/mk/
rust-0.2/mk/snap.mk
rust-0.2/mk/llvm.mk
rust-0.2/mk/docs.mk
rust-0.2/mk/platform.mk
rust-0.2/mk/install.mk
	<!DOCTYPE HTML>
	<html><head><meta charset="UTF-8"><title>Compiled Elm</title><style>html,head,body { padding:0; margin:0; }
	body { font-family: 'Lucida Grande','Trebuchet MS','Bitstream Vera Sans',Verdana,Helvetica,sans-serif; }
	a {
	color: #1184CE;
	text-decoration: none;
	}
	a:hover {
	text-decoration: underline;
	color: rgb(234,21,122);
	#!/bin/bash

	# Usage:
	#
	# sudo ./restore-file-from-package.sh <filepath>
	#
	# Restore a file from the package that provides it.
	#
	# Source: http://askubuntu.com/a/67028/30482
	module NinetyNine where

	import Data.List (foldl')

	-- Problem 1: Find the last element of a list.
	myLast :: [a] -> a
	myLast [] = error "myLast []"
	myLast (x:xs) = foldl' (flip const) x xs

	-- Problem 2: Find the last but one element of a list.
	james@bast:~$ cd /tmp/
	james@bast:/tmp$ tar -xvf rust-0.2.tar.gz
	rust-0.2/
	rust-0.2/Makefile.in
	rust-0.2/mk/
	rust-0.2/mk/snap.mk
	rust-0.2/mk/llvm.mk
	rust-0.2/mk/docs.mk
	rust-0.2/mk/platform.mk
	rust-0.2/mk/install.mk