levicole

extension NSImage {
    func drawInTargetSize(targetSize: NSSize) -> NSImage? {
        let aspectRatio = max(targetSize.width/self.size.width, targetSize.height/self.size.height)
        let newSize = NSSize(width: self.size.height * aspectRatio, height: self.size.height * aspectRatio)
        var newRect = NSRect(origin: NSPoint(x: 0, y: 0), size: newSize)
        
        let ctx = NSGraphicsContext()
        guard let resizedImage = self.CGImageForProposedRect(&newRect, context: ctx, hints: nil) else { return nil }
        
        let yOffset = (newSize.height > targetSize.height) ? floor((newSize.height - targetSize.height)/2.0) : 0

levicole

def knapsack(weights, values, max_weight)
  raise ArgumentError nil if weights.length != values.length
  matrix = (1..values.length).collect { || Array.new(max_weight + 1, 0) }
  matrix.each_with_index do |row, i|
    weight = weights[i]
    value  = values[i]
    row.each_with_index do |current_value, j|
      previous = matrix[i - 1][j].to_i
      if j >= weight
        row[j] = new = [matrix[i - 1][j - weight].to_i + value, previous].max

levicole

response.headers["Cache-Control"] = "no-cache, no-store, max-age=0, must-revalidate"
response.headers["Pragma"] = "no-cache"
response.headers["Expires"] = "Fri, 01 Jan 1990 00:00:00 GMT"

levicole

<%# form_for @model do |f| -%>
  <!-- this is an HTML comment -->
<%# end -%>

<%# link_to blah, blah %>

levicole

if [ -f ~/.bashrc ]; then
   source ~/.bashrc
fi

levicole

attr_tracker

As a Developer, I want a generator that generates the appropriate migration for tracking attribute changes

When writing a gem that requires a database migration, you should provide a generator for your users so that they don't have to write the migration themselves. Some questions you should ask yourself:

• What will your data model look like?
• What should the table be named?
• Should we allow our users to name the table themselves?
• Should the generator generate the model as well? Or should we keep the model in the gem?

levicole

CONVERSION_HASH = {
  1 => "one",
  2 => "two",
  3 => "three",
  4 => "four",
  5 => "five",
  6 => "six",
  7 => "seven",
  8 => "eight",
  9 => "nine",

levicole

= form_for Activity.new do |f|
  = f.hidden_field :activity_type, "shower"
  = f.text_field :per_use
  
= form_for Activity.new do |f|
  = f.hidden_field :activity_type, "bath"
  = f.text_field :per_use

= form_for Activity.new do |f|
  = f.hidden_field :activity_type, "toothbrush"

levicole

ROMAN_MAP = {
  1 => "I",
  4 => "IV",
  5 => "V",
  9 => "IX",
  10 => "X",
  40 => "XL",
  50 => "L",
  90 => "XC",
  100 => "C",

levicole

(defn elipse-maker [n]
  (fn [p]
    (str/join " " (conj (vec (take n (str/split p #"\W+"))) "..."))))