commit e342ff703fa9531b4ea4d2f09e423f07f6755c08
Author: Danila Fedorin <danila.fedorin@gmail.com>
Date:   Sat Nov 9 20:16:50 2019 -0800

    Initial implementation of script

diff --git a/3dw.cr b/3dw.cr
new file mode 100644
index 0000000..d659c99
--- /dev/null
+++ b/3dw.cr
@@ -0,0 +1,57 @@
+require "./mutate.cr"
+require "random"
+
+class Generator
+  getter words : Array(String)
+
+  def initialize(@words)
+  end
+
+  def sentence(f = 3, t = 9)
+    words = [] of String
+    nwords = f + Random.rand(t - f + 1)
+    nwords.times do |time|
+      word = @words[time % @words.size]
+      word = word.capitalize if time == 0
+      words << word.mutate
+    end
+    return words.join(" ") + ". "
+  end
+
+  def paragraph(f = 4, t = 20)
+    nsentences = f + Random.rand(t - f + 1)
+    sentences = Array(String).new(nsentences) { sentence }
+    return sentences.join("")
+  end
+
+  def subsection(f = 4, t = 20)
+    title = "\\subsection{#{sentence(@words.size, @words.size)}}\n"
+    nparas = f + Random.rand(t - f + 1)
+    paras = Array(String).new(nparas) { paragraph }
+    return title + paras.join("\n\n")
+  end
+
+  def section(f = 4, t = 20)
+    title = "\\section{#{sentence(@words.size, @words.size)}}\n"
+    nsections = f + Random.rand(t - f + 1)
+    subsections = Array(String).new(nsections) { subsection }
+    return title + paragraph + "\n\n" + subsections.join("\n\n")
+  end
+
+  def document(f = 2, t = 4)
+    title = sentence(@words.size, @words.size)
+    abstrct = paragraph(10, 10)
+    nsections = f + Random.rand(t - f + 1)
+    sections = Array(String).new(nsections) { section }
+    prefix = "\\documentclass[10pt, draftclsnofoot,onecolumn]{IEEEtran}" +
+      "\\def\\changemargin#1#2{\list{}{\\rightmargin#2\\leftmargin#1}\\item[]}" +
+      "\\let\\endchangemargin=\\endlist" +
+      "\\begin{document}"
+    postfix = "\\end{document}"
+    return prefix + "\\title{#{title}}\n\n\\maketitle\n\n\\begin{abstract}#{abstrct}\\end{abstract}\n\n\\pagebreak\n\n\\tableofcontents\\pagebreak" + sections.join("\n\n") + postfix
+  end
+end
+
+WORDS = ["three", "day", "weekend"]
+generator = Generator.new WORDS
+puts generator.document
diff --git a/mutate.cr b/mutate.cr
new file mode 100644
index 0000000..bffa311
--- /dev/null
+++ b/mutate.cr
@@ -0,0 +1,58 @@
+require "random"
+
+class String
+  @@nearby_chars = {
+    'q' => ['w', 'a'],
+    'w' => ['q', 'e', 's'],
+    'e' => ['w', 'r', 'd'],
+    'r' => ['e', 't', 'f'],
+    't' => ['r', 'y', 'g'],
+    'y' => ['t', 'h', 'u'],
+    'u' => ['y', 'j', 'i'],
+    'i' => ['u', 'k', 'o'],
+    'o' => ['i', 'l', 'p'],
+    'p' => ['o', 'l'],
+    'a' => ['q', 's', 'z'],
+    's' => ['w', 'r', 'a', 'x'],
+    'd' => ['s', 'e', 'f', 'x', 'c'],
+    'f' => ['d', 'r', 'x', 'c', 'v'],
+    'g' => ['f', 't', 'h', 'v', 'b'],
+    'h' => ['g', 'y', 'j', 'b', 'n'],
+    'j' => ['h', 'u', 'k', 'n', 'm'],
+    'k' => ['j', 'i', 'l', 'm'],
+    'l' => ['k', 'o', 'p'],
+    'z' => ['a', 's', 'x'],
+    'x' => ['z', 's', 'd', 'c'],
+    'c' => ['x', 'd', 'f', 'v'],
+    'v' => ['c', 'f', 'g', 'b'],
+    'b' => ['v', 'g', 'h', 'n'],
+    'n' => ['b', 'h', 'j', 'm'],
+    'm' => ['n', 'j', 'k', 'l'],
+    ' ' => [' ']
+  }
+
+  def mutate
+    return self if Random.rand > 0.1
+    mutations = [
+      ->mutate_modify,
+      ->mutate_insert
+    ]
+    return mutations.sample(1)[0].call.mutate
+  end
+
+  def mutate_modify
+    index = Random.rand(size)
+    was_upcase = self[index].uppercase?
+    char = self[index].downcase
+    char = @@nearby_chars[char].sample(1)[0]
+    char = char.upcase if was_upcase
+    new_chars = chars
+    new_chars[index] = char
+    return new_chars.join("")
+  end
+
+  def mutate_insert
+    index = Random.rand(size)
+    return insert(index, ' ')
+  end
+end