Fixes for building with 0.13 (#1)

* Fixes for building with 0.13

While at it, also make the library a module.

* Switch to GenericReader, Reader is deprecated

* Update build.zig

* Update build.zig

---------

Co-authored-by: Meghan Denny <hello@nektro.net>

build.zig

@@ -1,14 +1,27 @@
 const std = @import("std");
 
-pub fn build(b: *std.build.Builder) void {
+pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
     const mode = b.option(std.builtin.Mode, "mode", "") orelse .Debug;
 
+    const torrent_file = b.path("archlinux-2021.04.01-x86_64.iso.torrent");
+
+    const bencode = b.addModule("bencode", .{
+        .root_source_file = b.path("src/lib.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
     const exe = b.addExecutable(.{
         .name = "zig-bencode",
-        .root_source_file = .{ .path = "src/main.zig" },
+        .root_source_file = b.path("src/main.zig"),
         .target = target,
-        .optimize = mode,
+        .optimize = optimize,
+    });
+    exe.root_module.addImport("bencode", bencode);
+
+    exe.root_module.addAnonymousImport("torrent_file", .{
+        .root_source_file = torrent_file,
     });
 
     b.installArtifact(exe);

build.zig.zon

@@ -0,0 +1,12 @@
+.{
+    .name = "bencode",
+    .version = "0.0.0",
+    .dependencies = .{},
+    .paths = .{
+        "build.zig",
+        "build.zig.zon",
+        "README.md",
+        "LICENSE",
+        "src",
+    },
+}

src/lib.zig

@@ -92,7 +92,7 @@ pub const Value = union(enum) {
     }
 
     pub fn getU(self: Value, key: []const u8) ?u64 {
-        return @intCast(u64, self.getI(key) orelse return null);
+        return @intCast(self.getI(key) orelse return null);
     }
 };
 
@@ -190,7 +190,7 @@ fn PeekableReader(comptime ReaderType: type) type {
 
         const Self = @This();
         pub const Error = ReaderType.Error;
-        pub const Reader = std.io.Reader(*Self, Error, read);
+        pub const Reader = std.io.GenericReader(*Self, Error, read);
 
         fn read(self: *Self, dest: []u8) Error!usize {
             if (self.buf) |c| {

src/main.zig

@@ -1,12 +1,12 @@
 const std = @import("std");
-
-const bencode = @import("./lib.zig");
+const bencode = @import("bencode");
 
 pub fn main() !void {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
     const alloc = gpa.allocator();
 
-    const file = @embedFile("./../archlinux-2021.04.01-x86_64.iso.torrent");
+    const file = @embedFile("torrent_file");
+
     var buf = std.io.fixedBufferStream(file);
     const r = buf.reader();
     const ben = try bencode.parse(r, alloc);