From a8ee9f637eabc663839ac583c227b30fedecc9c9 Mon Sep 17 00:00:00 2001
From: Araozu <fernando@araozu.dev>
Date: Mon, 13 May 2024 11:37:25 -0500
Subject: [PATCH] Read file

---
 .gitignore     |  4 ++++
 inputs_test/01 |  5 +++++
 src/main.zig   | 41 +++++++++++++++++++++++++++++++++--------
 3 files changed, 42 insertions(+), 8 deletions(-)
 create mode 100644 .gitignore
 create mode 100644 inputs_test/01

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a553fc9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+inputs
+zig-out
+zig-cache
+
diff --git a/inputs_test/01 b/inputs_test/01
new file mode 100644
index 0000000..4cba7d0
--- /dev/null
+++ b/inputs_test/01
@@ -0,0 +1,5 @@
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet
+
diff --git a/src/main.zig b/src/main.zig
index c8a3f67..e18b136 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1,19 +1,44 @@
 const std = @import("std");
 
+const print = std.debug.print;
+
 pub fn main() !void {
     // Prints to stderr (it's a shortcut based on `std.io.getStdErr()`)
     std.debug.print("All your {s} are belong to us.\n", .{"codebase"});
 
-    // stdout is for the actual output of your application, for example if you
-    // are implementing gzip, then only the compressed bytes should be sent to
-    // stdout, not any debugging messages.
-    const stdout_file = std.io.getStdOut().writer();
-    var bw = std.io.bufferedWriter(stdout_file);
-    const stdout = bw.writer();
+    try day01part1(file_name(false, "01"));
+    try day01part1(file_name(true, "01"));
+}
 
-    try stdout.print("Run `zig build test` to run the tests.\n", .{});
+fn day01part1(filename: []const u8) !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+    const allocator = gpa.allocator();
 
-    try bw.flush(); // don't forget to flush!
+    const file = try std.fs.cwd().openFile(filename, .{});
+    defer file.close();
+
+    var buf_reader = std.io.bufferedReader(file.reader());
+    const reader = buf_reader.reader();
+
+    var line = std.ArrayList(u8).init(allocator);
+    defer line.deinit();
+
+    const writer = line.writer();
+    while (reader.streamUntilDelimiter(writer, '\n', null)) {
+        defer line.clearRetainingCapacity();
+
+        print(":D {s}\n", .{line.items});
+    } else |err| switch (err) {
+        error.EndOfStream => {},
+        else => return err,
+    }
+}
+
+/// Creates an input file name at comptime
+fn file_name(comptime is_test: bool, comptime day: []const u8) []const u8 {
+    const input_suffix = if (is_test) "_test/" else "/";
+    return "inputs" ++ input_suffix ++ day;
 }
 
 test "simple test" {