Allow brew install of command line tools made in Python

tl;dr

1. Create a repository called homebrew-[name]
2. Go on (explained from now on)
3. brew tap [user name]/[name]
4. brew install [name]

Gonyo Gonyo

This time, I prepared a simple script that just converts dollars to yen. Flow until Web API is dropped into a command line tool using Python This will allow you to brew install

First, create a repository named homebrew-usdex and clone it.

$ git clone https://github.com/kei-sato/homebrew-usdex.git
$ cd homebrew-usdex

Create a file called [name] .rb in the root

usdex.rb

class Usdex < Formula
  desc "Exchange usd to any currency, or any currency to usd"
  homepage "https://gist.github.com/kei-sato/98675769952ec7538d6a"
  url "https://gist.githubusercontent.com/kei-sato/98675769952ec7538d6a/raw/3b041cdd0e93c93986b15d158bff158927cb84b1/usdex"
  sha256 "976ae1b2066b2cb40be934fb2265ccd3bd8489f78683c6eaecba29c50edd4758"
  version "1.0.0"

  def install
    bin.install "usdex"
  end
end

• desc --Application description
• homepage-Homepage if yes, git repository if not
• url --URL of the file to download (in the case of Gist, the link destination of the button called Raw is the direct URL to the file)
• sha256 --Hash value of the file to download (described later)
• version --Required

Then push, tap, install

$ git push origin master
$ brew tap kei-sato/usdex
$ brew install usdex
$ usdex -p 2.5 -v
1(USD) => 122.54078(JPY)
2.5(USD) => 306.35195(JPY)

SHA256? SHA-256 (Secure Hash Algorithm 256-bit)

SHA-256 is one of the calculation procedures (algorithms) for finding the "hash value", which is a characteristic value of fixed length, from the original text of arbitrary length.

• Algorithm that makes data 64 characters (hash value)
• Same data will have the same hash value + Different data will (almost certainly) have different hash values
• In other words, when there are two files, each has a hash value, and if they have the same hash value, it can be said that they are the same file.
• Then, if the file and the hash value corresponding to that file are published, when the file is downloaded, the hash value of the downloaded file is taken and it is the same by comparing it with the published hash value. You can confirm that the downloaded file has not been tampered with.

Can be generated with openssl

$ echo "hello" | openssl dgst -sha256
5891b5b522d5df086d0ff0b110fbd9d21bb4fc7163af34d08286a2e846f6be03
$ echo "hello, world" | openssl dgst -sha256
853ff93762a06ddbf722c4ebe9ddd66d8f63ddaea97f521c3ecc20da7c976020
$ echo "hello, world" > /tmp/hello
$ openssl dgst -sha256 /tmp/hello
SHA256(/tmp/hello)= 853ff93762a06ddbf722c4ebe9ddd66d8f63ddaea97f521c3ecc20da7c976020

Generate a hash value for the file you download with Homebrew

$ openssl dgst -sha256 usdex
SHA256(usdex)= 976ae1b2066b2cb40be934fb2265ccd3bd8489f78683c6eaecba29c50edd4758

Reference site

http://deeeet.com/writing/2014/05/20/brew-tap/ http://qiita.com/masawada/items/484bbf83ef39cad7af74