Refactor 2015 days 01 to 10

Split parts into separate files and remove some unused files

.gitignore

@@ -1 +1,5 @@
 *.bak
+
+# build artifacts
+part_one
+part_two

2015/day-01/common.rb

@@ -0,0 +1,8 @@
+INPUT = File.readlines(ARGV.first, chomp: true).first.chars
+
+def match_paren(char)
+    case char
+    when "(" then 1
+    when ")" then -1
+    end
+end

2015/day-01/main.rb

@@ -1,41 +0,0 @@
-#!/usr/bin/env ruby
-
-require "pathname"
-
-INPUTS = ["inputs/sample.txt", "inputs/puzzle.txt"].map { |x| Pathname(x) }
-
-def match_paren(char)
-    case char
-    when "(" then 1
-    when ")" then -1
-    end
-end
-
-def solve_part_1(content)
-  content.chars.sum { |x| match_paren(x) }
-end
-
-def solve_part_2(content)
-  content.chars.each.with_index(1).reduce(0) do |acc, (char, index)|
-    acc += match_paren(char)
-    return index if acc == -1
-    acc
-  end
-  nil
-end
-
-def main(files)
-  files.each do |file|
-    puts "File: #{file}"
-    file.read.lines do |line|
-      next if line.empty?
-      result = solve_part_1(line.chomp)
-      puts "  Floor: #{result}"
-      result = solve_part_2(line.chomp)
-      puts "  Basement Floor Position: #{result}"
-      puts " -" * 15
-    end
-  end
-end
-
-main(INPUTS)

2015/day-01/part_one.rb

@@ -0,0 +1,10 @@
+#!/usr/bin/env ruby
+
+require_relative "common"
+
+def part_one(chars)
+  chars.sum { |x| match_paren(x) }
+end
+
+result = part_one(INPUT)
+puts result

2015/day-01/part_two.rb

@@ -0,0 +1,15 @@
+#!/usr/bin/env ruby
+
+require_relative "common"
+
+def part_two(chars)
+  chars.each.with_index(1).reduce(0) do |acc, (char, index)|
+    acc += match_paren(char)
+    return index if acc == -1
+    acc
+  end
+  nil
+end
+
+result = part_two(INPUT)
+puts result

2015/day-02/common.rb

@@ -0,0 +1,6 @@
+INPUT = File.readlines(ARGV.first, chomp: true).lazy.map do |num|
+  dims = num.split("x").map(&:to_i)
+  [sides(*dims), *dims]
+end
+
+def sides(l, w, h) = [l * w, w * h, h * l]

2015/day-02/main.rb

@@ -1,55 +0,0 @@
-#!/usr/bin/env ruby
-
-require "pathname"
-
-INPUTS = [
-  Pathname("inputs/test.txt"),
-  Pathname("inputs/puzzle.txt"),
-].freeze
-
-def parse_input(data)
-  data.chomp.split("x").map(&:to_i)
-end
-
-def sides(length, width, height)
-  [length * width, width * height, height * length]
-end
-
-def solve_part_1(input)
-  input.lines.sum do |line|
-    sides = sides(*parse_input(line))
-    smallest = sides.min
-    sides.sum { |x| x * 2 } + smallest
-  end
-end
-
-def solve_part_2(input)
-  input.lines.sum do |line|
-    length, width, height = parse_input(line)
-    sides = sides(length, width, height)
-    circumference =
-      case sides.map.with_index.min.last
-      when 0 then length * 2 + width * 2
-      when 1 then width * 2 + height * 2
-      when 2 then height * 2 + length * 2
-      end
-    circumference + length * width * height
-  end
-end
-
-def main(files)
-  files.each do |file|
-    puts "File: #{file}"
-    content = file.read
-
-    result = solve_part_1(content.chomp)
-    puts "  Wrapping Paper: #{result}"
-    puts " -" * 15
-
-    result = solve_part_2(content.chomp)
-    puts "  Ribbon Length: #{result}"
-    puts " -" * 15
-  end
-end
-
-main(INPUTS)

2015/day-02/part_one.rb

@@ -0,0 +1,12 @@
+#!/usr/bin/env ruby
+
+require_relative "common"
+
+def part_one(dims)
+  dims.sum do |sides, *|
+    smallest = sides.min
+    sides.sum { |x| x * 2 } + smallest
+  end
+end
+
+puts part_one(INPUT)

2015/day-02/part_two.rb

@@ -0,0 +1,17 @@
+#!/usr/bin/env ruby
+
+require_relative "common"
+
+def part_two(dims)
+  dims.sum do |sides, length, width, height|
+    circumference =
+      case sides.map.with_index.min.last
+      when 0 then length * 2 + width * 2
+      when 1 then width * 2 + height * 2
+      when 2 then height * 2 + length * 2
+      end
+    circumference + length * width * height
+  end
+end
+
+puts part_two(INPUT)

2015/day-03/common.rb

@@ -0,0 +1,18 @@
+INPUT = File
+  .readlines(ARGV.first, chomp: true)
+  .lazy.map do |line|
+    line.each_char.map { |d| position_modifier(d) }
+  end
+
+def position_modifier(direction)
+  case direction
+  when ">" then [1, 0]
+  when "<" then [-1, 0]
+  when "^" then [0, 1]
+  when "v" then [0, -1]
+  end
+end
+
+def apply_direction(position, change)
+  position.map.with_index { |v, i| v + change[i] }
+end

2015/day-03/main.rb

@@ -1,78 +0,0 @@
-#!/usr/bin/env ruby
-
-require "pathname"
-require "set"
-
-INPUTS = [
-  Pathname("inputs/test.txt"),
-  Pathname("inputs/puzzle.txt"),
-].freeze
-
-def position_modifier(direction)
-  case direction
-  when ">" then [1, 0]
-  when "<" then [-1, 0]
-  when "^" then [0, 1]
-  when "v" then [0, -1]
-  end
-end
-
-def apply_direction(position, change)
-  position.map.with_index { |v, i| v + change[i] }
-end
-
-def next_position(position, direction)
-  apply_direction(position, position_modifier(direction))
-end
-
-def solve_part_1(input)
-  input.lines.map do |line|
-    puts "  " + "-" * 10
-
-    position = [0, 0]
-
-    houses =
-      line.chomp.each_char.each_with_object(Set[position]) do |direction, visited|
-        next_pos = next_position(position, direction)
-        visited.add(next_pos)
-        position = next_pos
-      end
-
-    puts "  Houses: #{houses.size}"
-  end
-end
-
-def solve_part_2(input)
-  input.lines.map do |line|
-    puts "  " + "-" * 10
-
-    position_s = [0, 0]
-    position_r = position_s.dup
-
-    houses =
-      line.chomp.each_char.each_with_object(Set[position_s.dup]).with_index(1) do |(direction, visited), index|
-        if index.even?
-          next_pos = next_position(position_s, direction)
-          visited.add(next_pos)
-          position_s = next_pos
-        else
-          next_pos = next_position(position_r, direction)
-          visited.add(next_pos)
-          position_r = next_pos
-        end
-      end
-
-    puts "  Houses: #{houses.size}"
-  end
-end
-
-def main(files)
-  files.each do |file|
-    puts "File: #{file}"
-    solve_part_1(file.read.chomp)
-    puts "=" * 15
-    solve_part_2(file.read.chomp)
-  end
-end
-
-main(INPUTS)

2015/day-03/part_one.rb

@@ -0,0 +1,17 @@
+#!/usr/bin/env ruby
+
+require "set"
+require_relative "common"
+
+def part_one(chars)
+  position = [0, 0]
+  chars
+    .each_with_object(Set[position]) do |direction, visited|
+      next_pos = apply_direction(position, direction)
+      visited.add(next_pos)
+      position = next_pos
+    end
+    .size
+end
+
+puts part_one(INPUT.first)

2015/day-03/part_two.rb

@@ -0,0 +1,26 @@
+#!/usr/bin/env ruby
+
+require "set"
+require_relative "common"
+
+def part_two(chars)
+  position_s = [0, 0]
+  position_r = position_s.dup
+
+  chars
+    .each_with_object(Set[position_s.dup])
+    .with_index(1) do |(direction, visited), index|
+      if index.even?
+        next_pos = apply_direction(position_s, direction)
+        visited.add(next_pos)
+        position_s = next_pos
+      else
+        next_pos = apply_direction(position_r, direction)
+        visited.add(next_pos)
+        position_r = next_pos
+      end
+    end
+    .size
+end
+
+puts part_two(INPUT.first)

2015/day-04/.gitignore

@@ -1 +0,0 @@
-main

2015/day-04/common.rs

@@ -0,0 +1,54 @@
+mod md5;
+mod threadpool;
+
+pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+pub type ThreadPool = threadpool::ThreadPool<Vec<usize>>;
+
+pub fn extract_result(pool: &ThreadPool) -> Option<usize> {
+    let mut smallest = None;
+    while let Some(result) = pool.next_result().unwrap() {
+        let result = result.into_iter().min();
+        if !result.is_none() && (smallest.is_none() || smallest > result) {
+            smallest = result;
+        }
+    }
+    smallest
+}
+
+pub fn find_suffix_with_zeroes(input: &str, amount: usize) -> usize {
+    let pool = ThreadPool::with_threads(8);
+
+    let mut start = 1;
+    let mut tries = 8;
+
+    let test_string = "0".repeat(amount);
+
+    loop {
+        if tries == 0 {
+            match extract_result(&pool) {
+                None => tries = 7,
+                Some(v) => return v,
+            }
+        }
+
+        let test_string = test_string.clone();
+        let input = input.to_owned();
+        pool.add_task(move || {
+            (start..)
+                .into_iter()
+                .take(20_000)
+                .filter_map(|i| {
+                    let secret = format!("{}{}", input, i);
+                    let hexdigest = md5::hexdigest(&secret);
+                    if hexdigest.starts_with(&test_string) {
+                        Some(i)
+                    } else {
+                        None
+                    }
+                })
+                .collect::<Vec<_>>()
+        });
+        tries -= 1;
+        start += 20_000;
+    }
+}

2015/day-04/part_one.rs

@@ -0,0 +1,18 @@
+mod common;
+
+use std::env;
+use std::fs::read_to_string;
+
+use common::{find_suffix_with_zeroes, Result};
+
+fn main() -> Result<()> {
+    let path = env::args().skip(1).next().unwrap();
+    let input = read_to_string(path)?;
+    let input = input.lines().next().unwrap().to_owned();
+
+    let result = find_suffix_with_zeroes(&input, 5);
+
+    println!("{}", result);
+
+    Ok(())
+}

2015/day-04/part_two.rs

@@ -0,0 +1,18 @@
+mod common;
+
+use std::env;
+use std::fs::read_to_string;
+
+use common::{find_suffix_with_zeroes, Result};
+
+fn main() -> Result<()> {
+    let path = env::args().skip(1).next().unwrap();
+    let input = read_to_string(path)?;
+    let input = input.lines().next().unwrap().to_owned();
+
+    let result = find_suffix_with_zeroes(&input, 6);
+
+    println!("{}", result);
+
+    Ok(())
+}

2015/day-04/src/main.rs

@@ -1,101 +0,0 @@
-mod md5;
-mod threadpool;
-
-use threadpool::ThreadPool;
-
-macro_rules! infile {
-    [$path:literal] => { ($path, include_str!($path)) }
-}
-
-const INPUTS: &[(&str, &str)] = &[
-    infile!("../inputs/test.txt"),
-    infile!("../inputs/puzzle.txt"),
-];
-
-fn extract_result(pool: &ThreadPool<Vec<usize>>) -> Option<usize> {
-    let mut smallest = None;
-    while let Some(result) = pool.next_result().unwrap() {
-        let result = result.into_iter().min();
-        if !result.is_none() && (smallest.is_none() || smallest > result) {
-            smallest = result;
-        }
-    }
-    smallest
-}
-
-fn solve_part_1(pool: &ThreadPool<Vec<usize>>, input: &str) -> usize {
-    let mut start = 1;
-    let mut tries = 7;
-
-    loop {
-        if tries == 0 {
-            match extract_result(&pool) {
-                None =>{ tries = 7 },
-                Some(v) => return v,
-            }
-        }
-
-        let input = input.to_string();
-        pool.add_task(move || {
-            (start..).into_iter()
-                .take(20_000)
-                .filter_map(|i| {
-                    let secret = format!("{}{}", input, i);
-                    let hexdigest = md5::hexdigest(&secret);
-                    if hexdigest.starts_with("00000") { Some(i) } else { None }
-                })
-                .collect::<Vec<_>>()
-            });
-        tries -= 1;
-        start += 20_000;
-    }
-}
-
-fn solve_part_2(pool: &ThreadPool<Vec<usize>>, input: &str) -> usize {
-    let mut start = 1;
-    let mut tries = 8;
-
-    loop {
-        if tries == 0 {
-            match extract_result(&pool) {
-                None =>{ tries = 7 },
-                Some(v) => return v,
-            }
-        }
-
-        let input = input.to_string();
-        pool.add_task(move || {
-            (start..).into_iter()
-                .take(20_000)
-                .filter_map(|i| {
-                    let secret = format!("{}{}", input, i);
-                    let hexdigest = md5::hexdigest(&secret);
-                    if hexdigest.starts_with("000000") { Some(i) } else { None }
-                })
-                .collect::<Vec<_>>()
-            });
-
-        tries -= 1;
-        start += 20_000;
-    }
-}
-
-fn main() {
-    let pool = ThreadPool::with_threads(8);
-
-    for (path, input) in INPUTS {
-        println!("File: {}", path);
-
-        for line in input.split('\n') {
-            if line.is_empty() { continue }
-
-            println!("\tInput: {}", line);
-
-            let solution = solve_part_1(&pool, &line);
-            println!("\t\tFive leading zeroes: {}", solution);
-
-            let solution = solve_part_2(&pool, &line);
-            println!("\t\tSix leading zeroes: {}", solution);
-        }
-    }
-}

2015/day-05/common.rb

@@ -0,0 +1,9 @@
+LINES = File.each_line(ARGV.first, chomp: true)
+
+def count_nice(lines)
+  LINES.sum do |line|
+    # line = line.chomp # chomp: true keyword argument emits warnings
+    next 0 if line.empty?
+    yield(line) ? 1 : 0
+  end
+end

2015/day-05/main.rb

@@ -1,86 +0,0 @@
-#!/usr/bin/env -S ruby
-
-require "pathname"
-require "set"
-
-INPUTS = [
-  Pathname("inputs/test.txt"),
-  Pathname("inputs/puzzle.txt"),
-].freeze
-VOWELS = %[a e i o u].freeze
-
-def vowel_count(input)
-  input.each_char.sum do |char|
-    VOWELS.include?(char) ? 1 : 0
-  end
-end
-
-def twin_letters(input)
-  input.each_char.each_cons(2).sum do |(char, next_char)|
-    char == next_char ? 1 : 0
-  end
-end
-
-def letter_pairs_count(input)
-  characters = input
-    .each_char
-    .each_cons(4)
-    .reject { |(a, b, c, d)| (a == b && b == c || b == c && c == d ) && a != d }
-
-  last_index = characters.size
-  pairs = characters
-    .flat_map
-    .with_index(1) { |(a, b, c, d), i| i == last_index ? [a+b, b+c, c+d] : [a+b] }
-
-  pairs.tally.values.max || 0
-end
-
-def surrounded_letter_count(input)
-  input
-    .each_char
-    .each_cons(3)
-    .count { |(a, _, b)| a == b }
-end
-
-def is_nice?(input)
-  return false if input.match?(/ab|cd|pq|xy/)
-  return false unless vowel_count(input) >= 3
-  return false unless twin_letters(input) >= 1
-
-  true
-end
-
-def is_really_nice?(input)
-  return false if letter_pairs_count(input) < 2
-  return false if surrounded_letter_count(input).zero?
-
-  true
-end
-
-def count_nice(file)
-  file.each_line.sum do |line|
-    line = line.chomp # chomp: true keyword argument emits warnings
-    next 0 if line.empty?
-    yield(line) ? 1 : 0
-  end
-end
-
-def solve_part_1(file)
-  nice_lines = count_nice(file) { |l| is_nice?(l) }
-  puts "\tThere are #{nice_lines} nice lines"
-end
-
-def solve_part_2(file)
-  nice_lines = count_nice(file) { |l| is_really_nice?(l) }
-  puts "\tThere are #{nice_lines} really nice lines"
-end
-
-def main(files)
-  files.each do |file|
-    puts "File: #{file}"
-    solve_part_1(file)
-    solve_part_2(file)
-  end
-end
-
-main(INPUTS)

2015/day-05/part_one.rb

@@ -0,0 +1,30 @@
+#!/usr/bin/env ruby
+
+VOWELS = %[a e i o u].freeze
+
+def vowel_count(input)
+  input.each_char.sum do |char|
+    VOWELS.include?(char) ? 1 : 0
+  end
+end
+
+def twin_letters(input)
+  input.each_char.each_cons(2).sum do |(char, next_char)|
+    char == next_char ? 1 : 0
+  end
+end
+
+def is_nice?(input)
+  return false if input.empty?
+  return false if input.match?(/ab|cd|pq|xy/)
+  return false unless vowel_count(input) >= 3
+  return false unless twin_letters(input) >= 1
+
+  true
+end
+
+result = File.readlines(ARGV.first, chomp: true).sum do |line|
+  is_nice?(line) ? 1 : 0
+end
+
+puts result

2015/day-05/part_two.rb

@@ -0,0 +1,36 @@
+#!/usr/bin/env ruby
+
+def letter_pairs_count(input)
+  characters = input
+    .each_char
+    .each_cons(4)
+    .reject { |(a, b, c, d)| (a == b && b == c || b == c && c == d ) && a != d }
+
+  last_index = characters.size
+  pairs = characters
+    .flat_map
+    .with_index(1) { |(a, b, c, d), i| i == last_index ? [a+b, b+c, c+d] : [a+b] }
+
+  pairs.tally.values.max || 0
+end
+
+def surrounded_letter_count(input)
+  input
+    .each_char
+    .each_cons(3)
+    .count { |(a, _, b)| a == b }
+end
+
+def is_really_nice?(input)
+  return false if input.empty?
+  return false if letter_pairs_count(input) < 2
+  return false if surrounded_letter_count(input).zero?
+
+  true
+end
+
+result = File.readlines(ARGV.first, chomp: true).sum do |line|
+  is_really_nice?(line) ? 1 : 0
+end
+
+puts result

2015/day-06/.ruby-version

@@ -1 +0,0 @@
-3.0.0

2015/day-06/common.rb

@@ -0,0 +1,33 @@
+class Grid
+  def initialize
+    @area = Array.new(1000) { Array.new(1000) { 0 } }
+    @commands = {
+      turn_on: ->(area) { 1 },
+      toggle: ->(area) { area ^ 0x1 },
+      turn_off: -> (area) { 0 }
+    }
+  end
+
+  def set_command(name, callback) = @commands[name.to_sym] = callback
+
+  def apply(cmd, coords)
+    coords => [[x, y], [w, h]]
+    (y..h).each do |i|
+      (x..w).each do |j|
+        @area[i][j] = @commands[cmd.to_sym].(@area[i][j])
+      end
+    end
+  end
+
+  def lights_on = @area.sum { |r| r.count { |x| x != 0 }}
+  def brightness = @area.sum { |r| r.sum }
+end
+
+def parse_instruction(input)
+    left, right = input.split("through")
+    cmd, _, start_coords = left.strip.rpartition(" ").map(&:strip)
+    start_coords = start_coords.split(",").map(&:to_i)
+    end_coords = right.strip.split(",").map(&:to_i)
+
+    [cmd.tr(" ", "_"), [start_coords, end_coords]]
+end

2015/day-06/main.rb

@@ -1,75 +0,0 @@
-#!/usr/bin/env ruby
-
-require "pathname"
-
-INPUTS = [
-  Pathname("inputs/test.txt"),
-  Pathname("inputs/puzzle.txt"),
-].freeze
-
-class Grid
-  def initialize = @area = Array.new(1000) { Array.new(1000) { 0 } }
-
-  def apply(cmd, coords)
-    coords => [[x, y], [w, h]]
-    (y..h).each do |i|
-      (x..w).each do |j|
-        @area[i][j] = send(cmd, @area[i][j])
-      end
-    end
-  end
-
-  def lights_on = @area.sum { |r| r.count { |x| x != 0 }}
-  def brightness = @area.sum { |r| r.sum }
-
-  private
-
-  def turn_on(area) = 1
-  def toggle(area) = area ^ 0x1
-  def turn_off(area) = 0
-
-  def turn_on2(area) = area + 1
-  def turn_off2(area) = [area - 1, 0].max()
-  def toggle2(area) = area + 2
-end
-
-def parse_instruction(input)
-    input = input.chomp
-    left, right = input.split("through")
-    cmd, _, start_coords = left.strip.rpartition(" ").map(&:strip)
-    start_coords = start_coords.split(",").map(&:to_i)
-    end_coords = right.strip.split(",").map(&:to_i)
-
-    [cmd.tr(" ", "_"), [start_coords, end_coords]]
-end
-
-def solve_part_1(file)
-  grid = Grid.new()
-
-  file.each_line do |line|
-    grid.apply(*parse_instruction(line))
-  end
-
-  puts "\tLights on: #{grid.lights_on}"
-end
-
-def solve_part_2(file)
-  grid = Grid.new()
-
-  file.each_line do |line|
-    parse_instruction(line) => [cmd, coords]
-    grid.apply("#{cmd}2", coords)
-  end
-
-  puts "\tBrightness: #{grid.brightness}"
-end
-
-def main(files)
-  files.each do |file|
-    puts "File: #{file}"
-    solve_part_1(file)
-    solve_part_2(file)
-  end
-end
-
-main(INPUTS)

2015/day-06/part_one.rb

@@ -0,0 +1,11 @@
+#!/usr/bin/env ruby
+
+require_relative "common"
+
+grid = Grid.new()
+
+File.readlines(ARGV.first, chomp: true).each do |line|
+  grid.apply(*parse_instruction(line))
+end
+
+puts grid.lights_on

2015/day-06/part_two.rb

@@ -0,0 +1,15 @@
+#!/usr/bin/env ruby
+
+require_relative "common"
+
+grid = Grid.new()
+
+grid.set_command(:turn_on, ->(area) { area + 1 })
+grid.set_command(:turn_off, ->(area) { [area - 1, 0].max() })
+grid.set_command(:toggle, ->(area) { area + 2 })
+
+File.readlines(ARGV.first, chomp: true).each do |line|
+  grid.apply(*parse_instruction(line))
+end
+
+puts grid.brightness

2015/day-07/.gitignore

@@ -1 +0,0 @@
-main

2015/day-07/common.rs

@@ -40,8 +40,8 @@ pub struct Circuit {
 }
 
 impl Circuit {
-    pub fn add_instruction(&mut self, instruction: &str) {
-        let tokens = tokenize(instruction);
+    pub fn add_instruction(&mut self, input: &str) {
+        let tokens = tokenize(input);
         self.instructions.push_front(tokens);
     }
 
@@ -52,8 +52,8 @@ impl Circuit {
     }
 
     fn execute_one(&mut self, tokens: Vec<Token>) {
-        use self::Token::*;
         use self::Op::*;
+        use self::Token::*;
 
         self.instruction_len = tokens.len();
 
@@ -62,7 +62,7 @@ impl Circuit {
                 Ident(_) | Value(_) => {
                     self.stack.push(token.clone());
                     continue;
-                },
+                }
                 Op(Assign) => self.op_assign(),
                 Op(Not) => self.op_not(),
                 Op(And) => self.binop(|a, b| a & b),
@@ -75,26 +75,29 @@ impl Circuit {
                 Err(Error::VariableNotFound) => {
                     self.instructions.push_back(tokens);
                     return;
-                },
+                }
                 Err(e) => panic!("{:?}", e),
-                _ => ()
+                _ => (),
             }
         }
     }
 
+    #[allow(dead_code)]
     pub fn variable_override<N>(&mut self, name: N, value: Value)
-        where N: Into<Ident>
+    where
+        N: Into<Ident>,
     {
         self.overrides.insert(name.into(), value);
     }
 
     #[allow(dead_code)]
-    pub fn variables(&self) -> &HashMap<Ident,Value> {
+    pub fn variables(&self) -> &HashMap<Ident, Value> {
         &self.variables
     }
 
     pub fn variable<N>(&self, name: N) -> Option<&Value>
-        where N: AsRef<str>
+    where
+        N: AsRef<str>,
     {
         self.variables.get(name.as_ref())
     }
@@ -107,16 +110,26 @@ impl Circuit {
         let rhs = self.stack.pop().unwrap();
 
         if let Ident(id) = lhs {
-            let replace = if self.instruction_len == 3 { self.overrides.get(&id) } else { None };
+            let replace = if self.instruction_len == 3 {
+                self.overrides.get(&id)
+            } else {
+                None
+            };
             match (rhs, replace) {
-                (Value(_), Some(val)) => { self.variables.insert(id, *val); },
-                (Value(val), None) => { self.variables.insert(id, val); },
+                (Value(_), Some(val)) => {
+                    self.variables.insert(id, *val);
+                }
+                (Value(val), None) => {
+                    self.variables.insert(id, val);
+                }
                 (Ident(id2), _) => {
-                    let tmp = *self.variables.get(&id2)
+                    let tmp = *self
+                        .variables
+                        .get(&id2)
                         .ok_or_else(|| Error::VariableNotFound)?;
                     self.variables.insert(id, tmp);
-                },
-                _ => return Err(Error::InvalidStack)
+                }
+                _ => return Err(Error::InvalidStack),
             }
         }
 
@@ -132,20 +145,23 @@ impl Circuit {
         match token {
             Value(val) => {
                 self.stack.push(Value(!val));
-            },
+            }
             Ident(id) => {
-                let val = self.variables.get(&id)
+                let val = self
+                    .variables
+                    .get(&id)
                     .ok_or_else(|| Error::VariableNotFound)?;
                 self.stack.push(Value(!val));
-            },
-            _ => return Err(Error::InvalidStack)
+            }
+            _ => return Err(Error::InvalidStack),
         }
 
         Ok(())
     }
 
     fn binop<F>(&mut self, fun: F) -> Result<()>
-        where F: Fn(Value, Value) -> Value
+    where
+        F: Fn(Value, Value) -> Value,
     {
         use self::Token::*;
 
@@ -155,23 +171,31 @@ impl Circuit {
 
         match (lhs, rhs) {
             (Ident(id1), Value(val)) => {
-                let a = *self.variables.get(&id1)
+                let a = *self
+                    .variables
+                    .get(&id1)
                     .ok_or_else(|| Error::VariableNotFound)?;
                 self.stack.push(Value(fun(a, val)));
-            },
+            }
             (Ident(id1), Ident(id2)) => {
-                let a = *self.variables.get(&id1)
+                let a = *self
+                    .variables
+                    .get(&id1)
                     .ok_or_else(|| Error::VariableNotFound)?;
-                let b = *self.variables.get(&id2)
+                let b = *self
+                    .variables
+                    .get(&id2)
                     .ok_or_else(|| Error::VariableNotFound)?;
                 self.stack.push(Value(fun(a, b)));
-            },
+            }
             (Value(val), Ident(id2)) => {
-                let b = *self.variables.get(&id2)
+                let b = *self
+                    .variables
+                    .get(&id2)
                     .ok_or_else(|| Error::VariableNotFound)?;
                 self.stack.push(Value(fun(val, b)));
-            },
-            _ => return Err(Error::InvalidStack)
+            }
+            _ => return Err(Error::InvalidStack),
         }
 
         Ok(())
@@ -193,13 +217,13 @@ fn tokenize(input: &str) -> Vec<Token> {
             otherwise => match otherwise.parse::<Value>() {
                 Ok(val) => Token::Value(val),
                 Err(_) => Token::Ident(word.to_string()),
-            }
+            },
         };
 
         match token {
             Token::Op(_) => {
                 operator = Some(token);
-            },
+            }
             _ => {
                 tokens.push(token);
                 if let Some(op) = operator.take() {

2015/day-07/part_one.rs

@@ -0,0 +1,23 @@
+mod common;
+
+use std::env;
+use std::fs::File;
+use std::io::{self, BufRead};
+
+use common::Circuit;
+
+fn main() -> io::Result<()> {
+    let path = env::args().nth(1).unwrap();
+    let file = io::BufReader::new(File::open(path)?);
+
+    let mut circuit = Circuit::default();
+    for line in file.lines() {
+        circuit.add_instruction(&line?);
+    }
+    circuit.execute();
+    let output = circuit.variable("a").unwrap();
+
+    println!("{}", output);
+
+    Ok(())
+}

2015/day-07/part_two.rs

@@ -0,0 +1,32 @@
+mod common;
+
+use std::env;
+use std::fs::File;
+use std::io::{self, BufRead};
+
+use common::Circuit;
+
+fn main() -> io::Result<()> {
+    let path = env::args().nth(1).unwrap();
+    let file = io::BufReader::new(File::open(path)?);
+    let instructions = file.lines().map(|l| l.unwrap()).collect::<Vec<_>>();
+
+    let mut circuit = Circuit::default();
+    for tokens in &instructions {
+        circuit.add_instruction(tokens);
+    }
+    circuit.execute();
+    let output = circuit.variable("a").copied().unwrap();
+
+    circuit = Circuit::default();
+    for tokens in &instructions {
+        circuit.add_instruction(tokens);
+    }
+    circuit.variable_override("b", output);
+    circuit.execute();
+    let output = circuit.variable("a").unwrap();
+
+    println!("{}", output);
+
+    Ok(())
+}

2015/day-07/src/main.rs

@@ -1,54 +0,0 @@
-mod circuit;
-
-use std::{
-    io::{self, BufRead},
-    fs::File,
-};
-use circuit::Circuit;
-
-const FILE_PATHS: &[&str] = &[
-    "inputs/test.txt",
-    "inputs/puzzle.txt",
-];
-
-fn solve_part_1(file_path: &str) -> io::Result<u16>{
-    let mut circuit = Circuit::default();
-
-    let file = io::BufReader::new(File::open(file_path)?);
-    for line in file.lines() {
-        circuit.add_instruction(&line?);
-    }
-    circuit.execute();
-    let a = circuit.variable("a").copied().unwrap_or_default();
-    println!("\ta: {:?}", a);
-
-    Ok(a)
-}
-
-fn solve_part_2(file_path: &str, a: u16) -> io::Result<()> {
-    let mut circuit = Circuit::default();
-
-    let file = io::BufReader::new(File::open(file_path)?);
-    for line in file.lines() {
-        circuit.add_instruction(&line?);
-    }
-    circuit.variable_override("b", a);
-    circuit.execute();
-
-    if let Some(a) = circuit.variable("a") {
-        println!("\ta: {:?}", a);
-    }
-
-    Ok(())
-}
-
-fn main() -> io::Result<()> {
-    for file_path in FILE_PATHS {
-        println!("File: {}", file_path);
-
-        let a = solve_part_1(file_path)?;
-        solve_part_2(file_path, a)?;
-    }
-
-    Ok(())
-}

2015/day-08/.ruby-version

@@ -1 +0,0 @@
-3.0.0

2015/day-08/main.rb

@@ -1,38 +0,0 @@
-#!/usr/bin/env ruby
-# frozen_string_literal: true
-
-require "pathname"
-
-INPUTS = [
-  Pathname("inputs/test.txt"),
-  Pathname("inputs/puzzle.txt"),
-].freeze
-
-def solve_part_1(file)
-  size = file.each_line.sum do |line|
-    line = line.chomp
-    line.size - line.undump.size
-  end
-
-  puts "\tSize 1: #{size}"
-end
-
-def solve_part_2(file)
-  size = file.each_line.sum do |line|
-    line = line.chomp
-    line.dump.size - line.size
-  end
-
-  puts "\tSize 2: #{size}"
-end
-
-def main(files)
-  files.each do |file|
-    puts "File: #{file}"
-
-    solve_part_1(file)
-    solve_part_2(file)
-  end
-end
-
-main(INPUTS)

2015/day-08/part_one.rb

@@ -0,0 +1,7 @@
+#!/usr/bin/env ruby
+
+size = File.readlines(ARGV.first, chomp: true).sum do |line|
+  line.size - line.undump.size
+end
+
+puts size

2015/day-08/part_two.rb

@@ -0,0 +1,7 @@
+#!/usr/bin/env ruby
+
+size = File.readlines(ARGV.first, chomp: true).sum do |line|
+  line.dump.size - line.size
+end
+
+puts size

2015/day-09/.gitignore

@@ -1,3 +1,3 @@
 *.dot
 *.png
-main
+dot

2015/day-09/common.rs

@@ -0,0 +1,39 @@
+use std::collections::HashSet;
+use std::error::Error as StdError;
+use std::fs::File;
+use std::io::{self, BufRead, BufReader};
+use std::path::Path;
+use std::result::Result as StdResult;
+
+use crate::graph;
+
+pub type Location = String;
+pub type Distance = u64;
+pub type Graph = graph::Graph<Location, Distance>;
+pub type Node = graph::Node<Location, Distance>;
+pub type NodeSet = HashSet<Node>;
+
+pub type Error = Box<dyn StdError>;
+pub type Result<T, E = Error> = StdResult<T, E>;
+
+pub fn parse_file<P>(path: P) -> io::Result<Graph>
+where
+    P: AsRef<Path>,
+{
+    let file = BufReader::new(File::open(path)?);
+    let mut directions = Graph::default();
+
+    for line in file.lines() {
+        let line = line?;
+        let words = line.split(' ').collect::<Vec<_>>();
+        let location = (
+            words[0].to_string(),
+            words[2].to_string(),
+            words[4].parse::<Distance>().unwrap(),
+        );
+
+        directions.add_edge(&location);
+    }
+
+    Ok(directions)
+}

2015/day-09/dot.rs

@@ -0,0 +1,53 @@
+mod common;
+mod graph;
+
+use std::env;
+use std::fs::OpenOptions;
+use std::io::Write;
+use std::path::PathBuf;
+
+use common::{Graph, Result};
+
+fn generate_dot(graph: &Graph, name: &str) -> Result<String> {
+    use std::fmt::Write;
+
+    let mut buf = String::new();
+
+    writeln!(buf, "strict graph {} {{", name)?;
+    for node in &graph.nodes {
+        for (outgoing, weight) in &node.borrow().outgoing {
+            writeln!(
+                buf,
+                "{} -- {} [ label = \"{}\" ];",
+                node.borrow().data,
+                outgoing.borrow().data,
+                weight
+            )?;
+        }
+    }
+    writeln!(buf, "}}")?;
+
+    Ok(buf)
+}
+
+fn main() -> Result<()> {
+    let path = PathBuf::from(env::args().nth(1).unwrap());
+    let graph = common::parse_file(&path)?;
+
+    let mut dot_path = path.clone();
+    dot_path.set_extension("dot");
+    let graph_name = dot_path.file_stem().unwrap().to_str().unwrap();
+
+    let dot = generate_dot(&graph, &graph_name)?;
+
+    let out_path = dot_path.file_name().unwrap();
+    let mut file = OpenOptions::new()
+        .write(true)
+        .truncate(true)
+        .create(true)
+        .open(out_path)?;
+
+    write!(file, "{}", dot)?;
+
+    Ok(())
+}

2015/day-09/part_one.rs

@@ -1,7 +1,11 @@
-use std::collections::HashSet;
-use crate::{Distance, Graph, Node};
+mod common;
+pub mod graph;
+mod utils;
 
-type NodeSet = HashSet<Node>;
+use std::cmp::min;
+use std::env;
+
+use crate::common::{Distance, Node, NodeSet, Result};
 
 // Only works with complete graphs (where each node leads to each other node)
 fn visit_all_shortest(start_node: &Node) -> Vec<(Node, Distance)> {
@@ -45,9 +49,9 @@ fn visit_all_shortest(start_node: &Node) -> Vec<(Node, Distance)> {
     path
 }
 
-/// Find shortest path that connects two points and visits all locations.
-pub fn solve(directions: &Graph) -> Distance {
-    use std::cmp::min;
+fn main() -> Result<()> {
+    let path = env::args().nth(1).unwrap();
+    let directions = common::parse_file(path)?;
 
     let mut shortest_distance = None;
 
@@ -58,12 +62,14 @@ pub fn solve(directions: &Graph) -> Distance {
             continue;
         }
 
-        let distance = path.iter().map(|p| p.1).sum();
+        let distance: Distance = path.iter().map(|p| p.1).sum();
         shortest_distance = match shortest_distance {
             None => Some(distance),
             Some(d) => Some(min(distance, d)),
         };
     }
 
-    shortest_distance.unwrap_or_default()
+    println!("{}", shortest_distance.unwrap_or_default());
+
+    Ok(())
 }

2015/day-09/part_two.rs

@@ -1,7 +1,11 @@
-use std::collections::HashSet;
-use crate::{Distance, Graph, Node};
+mod common;
+pub mod graph;
+mod utils;
 
-type NodeSet = HashSet<Node>;
+use std::cmp::max;
+use std::env;
+
+use crate::common::{Distance, Node, NodeSet, Result};
 
 struct Memo<'a> {
     max_dist: &'a mut Distance,
@@ -18,11 +22,14 @@ fn depth_first_search(node: &Node, memo: Memo<'_>) {
         if !memo.visited.contains(&out_node) {
             distance = memo.prev_dist + out_weight;
 
-            depth_first_search(&out_node, Memo {
-                max_dist: &mut *memo.max_dist,
-                prev_dist: distance,
-                visited: &mut *memo.visited,
-            });
+            depth_first_search(
+                &out_node,
+                Memo {
+                    max_dist: &mut *memo.max_dist,
+                    prev_dist: distance,
+                    visited: &mut *memo.visited,
+                },
+            );
         }
 
         if *memo.max_dist < distance {
@@ -38,17 +45,22 @@ fn visit_all_longest(start_node: &Node) -> Distance {
 
     let mut distance = 0;
 
-    depth_first_search(&start_node, Memo {
-        max_dist: &mut distance,
-        prev_dist: 0,
-        visited: &mut visited,
-    });
+    depth_first_search(
+        &start_node,
+        Memo {
+            max_dist: &mut distance,
+            prev_dist: 0,
+            visited: &mut visited,
+        },
+    );
 
     distance
 }
 
-pub fn solve(directions: &Graph) -> Distance {
-    use std::cmp::max;
+fn main() -> Result<()> {
+    let path = env::args().nth(1).unwrap();
+
+    let directions = common::parse_file(path)?;
 
     let mut longest_distance = 0;
 
@@ -57,5 +69,7 @@ pub fn solve(directions: &Graph) -> Distance {
         longest_distance = max(distance, longest_distance);
     }
 
-    longest_distance
+    println!("{}", longest_distance);
+
+    Ok(())
 }

2015/day-09/src/main.rs

@@ -1,34 +0,0 @@
-mod graph;
-mod utils;
-mod part1;
-mod part2;
-
-type Graph = graph::Graph<Location, Distance>;
-type Node = graph::Node<Location, Distance>;
-
-type Location = String;
-type Distance = u64;
-
-fn main() -> Result<(), Box<dyn std::error::Error>> {
-    use std::env;
-
-    let file_paths = env::args().skip(1).collect::<Vec<_>>();
-
-    for file_path in &file_paths {
-        let locations = utils::parse_file(file_path)?;
-
-        let mut directions = Graph::default();
-
-        for location in &locations {
-            directions.add_edge(location);
-        }
-
-        utils::write_dot(&directions, &file_path)?;
-
-        println!("{} / solution 1 = {:?}", file_path, part1::solve(&directions));
-        println!("{} / solution 2 = {:?}", file_path, part2::solve(&directions));
-    }
-
-    Ok(())
-}
-

2015/day-09/src/utils.rs

@@ -1,58 +0,0 @@
-use std::{
-    io::{self, BufRead},
-    path::{Path, PathBuf},
-};
-use crate::{Location, Distance, Graph};
-
-pub fn generate_dot(graph: &Graph, name: &str) -> Result<String, Box<dyn std::error::Error>> {
-    use std::fmt::Write;
-
-    let mut buf = String::new();
-
-    writeln!(buf, "strict graph {} {{", name)?;
-    for node in &graph.nodes {
-        for (outgoing, weight) in &node.borrow().outgoing {
-            writeln!(buf, "{} -- {} [ label = \"{}\" ];",
-                node.borrow().data,
-                outgoing.borrow().data,
-                weight
-            )?;
-        }
-    }
-    writeln!(buf, "}}")?;
-
-    Ok(buf)
-}
-
-pub fn write_dot<P>(graph: &Graph, path: P) -> Result<(), Box<dyn std::error::Error>>
-    where P: Into<PathBuf>
-{
-    use std::{fs::OpenOptions, io::Write};
-
-    let mut dot_path = path.into();
-    dot_path.set_extension("dot");
-    let graph_name = dot_path.file_stem().unwrap().to_str().unwrap();
-    let dot = generate_dot(&graph, &graph_name)?;
-    let out_path = dot_path.file_name().unwrap();
-    let mut file = OpenOptions::new().write(true).truncate(true).create(true).open(out_path)?;
-
-    write!(file, "{}", dot)?;
-    Ok(())
-}
-
-pub fn parse_file<P>(path: P) -> io::Result<Vec<(Location, Location, Distance)>>
-    where P: AsRef<Path>
-{
-    use std::{fs::File, io::BufReader};
-
-    let file = BufReader::new(File::open(path)?);
-    let dests = file.lines()
-        .map(|l| {
-            let line = l.unwrap();
-            let words = line.split(' ').collect::<Vec<_>>();
-            (words[0].to_string(), words[2].to_string(), words[4].parse::<Distance>().unwrap())
-        })
-        .collect();
-
-    Ok(dests)
-}

2015/day-10/.ruby-version

@@ -1 +0,0 @@
-3.0.0

2015/day-10/common.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require "stringio"
+
+def look_and_say(input)
+  counter = 1
+
+  output = input.each_char.map(&:to_i).chain([nil]).each_cons(2).reduce(StringIO.new) do |acc, (val1, val2)|
+    if val1 == val2
+      counter += 1
+    else
+      acc.write counter
+      acc.write val1
+      counter = 1
+    end
+
+    acc
+  end
+
+  output.rewind
+  output
+end

2015/day-10/main.rb

@@ -1,42 +0,0 @@
-#!/usr/bin/env ruby
-# frozen_string_literal: true
-
-require "pathname"
-require "stringio"
-
-def look_and_say(input)
-  counter = 1
-
-  output = input.each_char.map(&:to_i).chain([nil]).each_cons(2).reduce(StringIO.new) do |acc, (val1, val2)|
-    if val1 == val2
-      counter += 1
-    else
-      acc.write counter
-      acc.write val1
-      counter = 1
-    end
-
-    acc
-  end
-
-  output.rewind
-  output
-end
-
-def solve_part1(content)
-  puts 40.times.reduce(StringIO.new(content)) { |acc| look_and_say(acc) }.size
-end
-
-def solve_part2(content)
-  puts 50.times.reduce(StringIO.new(content)) { |acc, _| look_and_say(acc) }.size
-end
-
-def main(files)
-  files.each do |file|
-    content = file.read.chomp
-    solve_part1(content)
-    solve_part2(content)
-  end
-end
-
-main(ARGV.map { |x| Pathname(x) })

2015/day-10/part_one.rb

@@ -0,0 +1,8 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "stringio"
+require_relative "common"
+
+content = File.read(ARGV.first).chomp
+puts 40.times.reduce(StringIO.new(content)) { |acc| look_and_say(acc) }.size

2015/day-10/part_two.rb

@@ -0,0 +1,8 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "stringio"
+require_relative "common"
+
+content = File.read(ARGV.first).chomp
+puts 50.times.reduce(StringIO.new(content)) { |acc| look_and_say(acc) }.size