From 07a17b442d7d7a397d076babfaa29fd2620921d7 Mon Sep 17 00:00:00 2001
From: Nat Lasseter <user@4574.co.uk>
Date: Thu, 19 Jan 2017 10:54:32 +0000
Subject: Initial commit

---
 .gitignore            |  2 ++
 bin/ssh-update-config |  8 ++++++++
 example.rb            | 36 ++++++++++++++++++++++++++++++++++++
 lib/host.rb           | 19 +++++++++++++++++++
 lib/hosts.rb          | 22 ++++++++++++++++++++++
 lib/sshconfig.rb      | 13 +++++++++++++
 readme.textile        | 36 ++++++++++++++++++++++++++++++++++++
 sshconfig.gemspec     | 19 +++++++++++++++++++
 8 files changed, 155 insertions(+)
 create mode 100644 .gitignore
 create mode 100755 bin/ssh-update-config
 create mode 100755 example.rb
 create mode 100644 lib/host.rb
 create mode 100644 lib/hosts.rb
 create mode 100644 lib/sshconfig.rb
 create mode 100644 readme.textile
 create mode 100644 sshconfig.gemspec

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ecccbd3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.gem
+.*.swp
diff --git a/bin/ssh-update-config b/bin/ssh-update-config
new file mode 100755
index 0000000..e6cfe93
--- /dev/null
+++ b/bin/ssh-update-config
@@ -0,0 +1,8 @@
+#!/usr/bin/env ruby
+require 'sshconfig'
+include SSHConfig
+
+File.open(File.join(ENV["HOME"], ".ssh/config"), "w") do |f|
+  load File.join(ENV["HOME"], ".ssh/sshconfig")
+  f.puts $hostlist
+end
diff --git a/example.rb b/example.rb
new file mode 100755
index 0000000..ef72483
--- /dev/null
+++ b/example.rb
@@ -0,0 +1,36 @@
+# This is ruby
+# Lets make a method for later
+def old_keys
+  kexalgorithms "+diffie-hellman-group1-sha1"
+  hostkeyalgorithms "+ssh-dss"
+end
+
+hosts {
+  # Simple things
+  host("example") {
+    hostname "example.com"
+  }
+  host("pi") {
+    hostname "192.168.3.14"
+    user "root"
+  }
+
+  # LOOPS!
+  # #contrived
+  # Also, that method from earlier
+  (1..70).each { |machine|
+    host("my#{machine}-1") { hostname "mymachine#{machine}-1.example.co.uk" ; old_keys }
+    host("my#{machine}-2") { hostname "mymachine#{machine}-2.example.co.uk" ; old_keys }
+  }
+
+  # NO
+  # Don't do this
+  # Just remember that every directive is a method
+  host ('*') {
+    strictHostKeyChecking NO
+    userKnownHostsFile "/dev/null"
+    logLevel "ERROR"
+  }
+}
+
+# vim: set ft=ruby:
diff --git a/lib/host.rb b/lib/host.rb
new file mode 100644
index 0000000..90c3e2e
--- /dev/null
+++ b/lib/host.rb
@@ -0,0 +1,19 @@
+module SSHConfig
+  class Host
+    def initialize(name, &block)
+      @name = name
+      @directives = {}
+      self.instance_eval(&block)
+    end
+
+    def method_missing(meth, arg)
+      @directives[meth.capitalize] = arg
+    end
+
+    def to_s
+      "Host #{@name}\n" +
+      @directives.map { |k, v| "\t#{k} #{v}" }.join("\n") +
+      "\n"
+    end
+  end
+end
diff --git a/lib/hosts.rb b/lib/hosts.rb
new file mode 100644
index 0000000..1a0fc27
--- /dev/null
+++ b/lib/hosts.rb
@@ -0,0 +1,22 @@
+module SSHConfig
+  class Hosts
+    attr_reader :hosts
+
+    def initialize(&block)
+      @hosts = []
+      self.instance_eval(&block)
+    end
+
+    def merge(morehosts)
+      @hosts += morehosts.hosts
+    end
+
+    def host(name)
+      @hosts << Host.new(name, &Proc.new)
+    end
+
+    def to_s
+      @hosts.map(&:to_s).join("\n")
+    end
+  end
+end
diff --git a/lib/sshconfig.rb b/lib/sshconfig.rb
new file mode 100644
index 0000000..204a127
--- /dev/null
+++ b/lib/sshconfig.rb
@@ -0,0 +1,13 @@
+require 'host'
+require 'hosts'
+
+module SSHConfig
+  YES = "yes"
+  NO = "no"
+
+  $hostlist = Hosts.new{}
+
+  def hosts
+    $hostlist.merge(Hosts.new(&Proc.new))
+  end
+end
diff --git a/readme.textile b/readme.textile
new file mode 100644
index 0000000..e0c69ea
--- /dev/null
+++ b/readme.textile
@@ -0,0 +1,36 @@
+h1. SSHConfig
+
+This is a gem which allows you to programatically configure your ~/.ssh/config.
+
+It's a bit bad, but it works.
+
+h2. Config file
+
+Your new file to worry about is ~/.ssh/sshconfig.
+
+h2. ssh-update-config
+
+The @ssh-update-config@ command will generate the ~/.ssh/config file for you. The file will be overwritten.
+
+h2. Directives
+
+In the block you pass to a host method, any method becomes an sshconfig directive. It's method_missing_madness!
+
+h2. It's all ruby!
+
+h3. So write ruby!
+
+Methods, loops, variables; you name it.
+
+h3. $hostlist variable
+
+The grand list of hosts is stored in @$hostlist@. It's a @Hosts@ object. You can touch this. The @hosts {}@ method appends to this list. @$hostlist.host{}@ does the same as @hosts{host{}}@.
+
+h2. Building
+
+bc.   gem build sshconfig.gemspec
+  gem install --user-install sshconfig
+
+h2. Example
+
+There's an example file, take a look.
diff --git a/sshconfig.gemspec b/sshconfig.gemspec
new file mode 100644
index 0000000..ea6c5fa
--- /dev/null
+++ b/sshconfig.gemspec
@@ -0,0 +1,19 @@
+Gem::Specification.new do |s|
+  s.name        = 'sshconfig'
+  s.version     = '12'
+  s.date        = '2017-01-11'
+  s.summary     = "SSH Config DSL"
+  s.description = "A DSL to generate SSH config"
+  s.authors     = ["Nathan Lasseter"]
+  s.email       = 'nathan@bytemark.co.uk'
+  s.homepage    = 'https://github.com/User4574/SSHConfig'
+  s.files       = [
+    "lib/sshconfig.rb",
+    "lib/host.rb",
+    "lib/hosts.rb",
+  ]
+  s.executables = [
+    "ssh-update-config"
+  ]
+  s.license     = 'BSD-2-Clause'
+end
-- 
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