lukechampine

how to into git (and GitHub)

This is a handy reference for setting up and using git to contribute to projects on GitHub. It is by no means a complete guide to using git; use http://gitref.org for that.

Update: This site provides some excellent visualizations of what various git commands do. Highly recommended.

basics

setup

First run the following commands, using your real name and GitHub email address:

lukechampine

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<sys/mman.h>
typedef void V;typedef int I;typedef double F;typedef unsigned char C,*S;typedef long L;
#define O           printf
#define R           return
#define I(a...)     if(a)
#define W(a...)     while(a)

lukechampine

The Y Combinator

The Y Combinator is a classic lambda calculus construct that many people find baffling. Here's my attempt to explain it as clearly as possible (no promises!). Familiarity with Haskell syntax is assumed.

The problem we're trying to solve is how to write an anonymous function (a "lambda") that is recursive. Normally, if you want to write a recursive function, it looks like this:

fac n = if n == 0 then 1
        else n * fac (n-1)

lukechampine

Keybase proof

I hereby claim:

• I am lukechampine on github.
• I am lukechampine (https://keybase.io/lukechampine) on keybase.
• I have a public key whose fingerprint is 99C2 18A7 FA3C C119 562B D6C5 A5C1 CE07 4CBF 1D60

To claim this, I am signing this object:

lukechampine

package main

import (
	"encoding/json"
	"io/ioutil"
	"log"
	"os"

	"github.com/NebulousLabs/Sia/encoding"
	"github.com/NebulousLabs/Sia/persist"

lukechampine

[alias]
    au = add -u .
    c = commit -m
    ca = commit --amend
    can = commit --amend --no-edit
    cf = commit --fixup
    co = checkout
    cob = checkout -b
    com = checkout master
    cp = cherry-pick

lukechampine

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strconv"

	"github.com/NebulousLabs/Sia/crypto"

lukechampine

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strings"

	"github.com/NebulousLabs/Sia/modules"

lukechampine

#include <stdio.h>
#include <stdbool.h>

// Maybe

typedef struct MaybeInt {
    int  just;
    bool nothing;
} MaybeInt;

lukechampine

# ssh config to connect to a host via local network if available.
#
# For example, if the host is 192.168.1.10 on your local network,
# first run ssh-keyscan 192.168.1.10 to see what keys are available,
# then substitute that key for your_host_key (-t selects the key type).

Match exec "ssh-keyscan -T 1 -t ed25519 local.ip.for.host 2>/dev/null | grep -F your_host_key" host yourhostname
    Hostname local.ip.for.host
    Port 22