From 26c84938994ee6659936aee81a04e6eb41c97b6d Mon Sep 17 00:00:00 2001
From: Ummon <greg.burri@gmail.com>
Date: Tue, 10 Dec 2019 20:28:19 +0100
Subject: [PATCH] Remove dependency to 'image'

---
 Cargo.toml   |  3 +--
 src/day08.rs | 19 ++++++++++++++++---
 src/main.rs  |  7 ++-----
 3 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 7db3d01..c7438f7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,5 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-itertools = "0.8"
-image = "0.22"
\ No newline at end of file
+itertools = "0.8"
\ No newline at end of file
diff --git a/src/day08.rs b/src/day08.rs
index 0f1bb38..95b0385 100644
--- a/src/day08.rs
+++ b/src/day08.rs
@@ -47,9 +47,22 @@ pub fn merge_layers(layers: &[Vec<u8>]) -> Vec<u8> {
     result
 }
 
-pub fn write_layer<P : AsRef<std::path::Path>>(layer: &[u8], width: u32, height: u32, to: P) {
-    let layer_normalized: Vec<u8> = layer.iter().map(|v| v * 255).collect();
-    let _ = image::save_buffer(to, &layer_normalized, width, height, image::Gray(8));
+pub fn layer_to_printable_string(layer: &[u8], width: u32) -> String {
+    let mut result = String::new();
+    let mut i = 0;
+
+    loop {
+        for _ in 0 .. width {
+            if layer[i] == 0 {
+                result += " ";
+            } else {
+                result += "█";
+            }
+            i += 1;
+            if i >= layer.len() { return result }
+        }
+        result += "\n";
+    }
 }
 
 pub fn one_digits_times_two_digits(layer: &[u8]) -> u32 {
diff --git a/src/main.rs b/src/main.rs
index c388bbd..42699c7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -59,12 +59,9 @@ fn day08() -> String {
     let layers = day08::decode_image(&raw, 25, 6);
 
     let layer = day08::layer_with_fewer_0(&layers[..]);
-    let result = day08::merge_layers(&layers[..]);
+    let merged = day08::merge_layers(&layers[..]);
 
-    let img_output = "data/day08.png";
-    day08::write_layer(&result, 25, 6, img_output);
-
-    format!("part1: {}, part2: {}", day08::one_digits_times_two_digits(layer), img_output)
+    format!("part1: {}, part2:\n{}", day08::one_digits_times_two_digits(layer), day08::layer_to_printable_string(&merged, 25))
 }
 
 fn day09() -> String {
-- 
2.45.2