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Javier Orfo
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‎README.md‎

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# zig-epub
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Zig library for creating EPUB files
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*Zig library for creating EPUB files*

‎build.zig‎

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const std = @import("std");
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pub fn build(b: *std.Build) void {
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const target = b.standardTargetOptions(.{});
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const optimize = b.standardOptimizeOption(.{});
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const lib = b.addStaticLibrary(.{
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.name = "zig-epub",
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.root_source_file = b.path("src/root.zig"),
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.target = target,
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.optimize = optimize,
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});
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b.installArtifact(lib);
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const lib_unit_tests = b.addTest(.{
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.root_source_file = b.path("src/root.zig"),
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.target = target,
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.optimize = optimize,
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});
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const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);
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const test_step = b.step("test", "Run unit tests");
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test_step.dependOn(&run_lib_unit_tests.step);
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}

‎build.zig.zon‎

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.{
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.name = "zig-epub",
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.version = "0.0.0",
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.minimum_zig_version = "0.13.0",
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.dependencies = .{},
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.paths = .{
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"build.zig",
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"build.zig.zon",
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"src",
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"LICENSE",
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"README.md",
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},
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}

‎src/Epub.zig‎

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const std = @import("std");
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const UUID = @import("UUID.zig");
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const Section = @import("Section.zig");
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const testing = std.testing;
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allocator: std.mem.Allocator,
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metadata: Metadata,
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sections: ?[]Section = null,
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// TODO
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// stylesheets: []Stylesheet,
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// images: []Image,
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const Epub = @This();
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pub fn init(allocator: std.mem.Allocator, metadata: Metadata) Epub {
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return .{
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.allocator = allocator,
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.metadata = metadata,
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};
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}
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const Metadata = struct {
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title: []const u8,
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creator: []const u8,
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identifier: []const u8,
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language: []const u8 = "en",
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date: ?[]const u8 = null,
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publisher: ?[]const u8 = null,
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};
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test "epub" {
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const uuid = UUID.new();
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const epub = Epub.init(testing.allocator, .{ .title = "test", .creator = "John", .identifier = uuid });
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try testing.expect(@TypeOf(epub) == Epub);
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}

‎src/Section.zig‎

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const std = @import("std");
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const testing = std.testing;
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name: []const u8,
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content: Content,
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allocator: std.mem.Allocator,
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const Section = @This();
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pub fn init(allocator: std.mem.Allocator, name: []const u8, content: Content) Section {
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return .{
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.allocator = allocator,
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.name = name,
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.content = content,
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};
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}
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const Content = union(enum) {
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raw: []const u8,
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file_path: []const u8,
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pub fn get(self: Content, allocator: std.mem.Allocator) ![]const u8 {
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switch (self) {
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.file_path => |f| return try readFileToString(allocator, f),
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.raw => |r| return r,
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}
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}
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fn readFileToString(allocator: std.mem.Allocator, file_path: []const u8) ![]const u8 {
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var file = try std.fs.openFileAbsolute(file_path, .{});
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defer file.close();
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const file_size = try file.getEndPos();
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var buffer = try allocator.alloc(u8, file_size);
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errdefer allocator.free(buffer);
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const read = try file.readAll(buffer);
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return buffer[0..read];
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}
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pub fn isFile(self: Content) bool {
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switch (self) {
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.file_path => return true,
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.raw => return false,
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}
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}
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};
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test "section raw" {
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const alloc = testing.allocator;
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const raw =
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\\ <h1>Title</h2>
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\\ <p>Something</p>
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;
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var section = Section.init(alloc, "chapter1", .{ .raw = raw });
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try testing.expectEqualStrings(raw, try section.content.get(alloc));
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}
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test "section file" {
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const alloc = testing.allocator;
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const cwd_path = try std.fs.cwd().realpathAlloc(alloc, ".");
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defer alloc.free(cwd_path);
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const absolute_path = try std.fs.path.resolve(alloc, &.{ cwd_path, "README.md" });
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defer alloc.free(absolute_path);
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var section = Section.init(alloc, "chapter2", .{ .file_path = absolute_path });
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const value = try section.content.get(alloc);
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defer alloc.free(value);
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try testing.expectEqualStrings("zig-epub", value[2..10]);
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}
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test "section file error" {
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const alloc = testing.allocator;
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var section = Section.init(alloc, "chapter3", .{ .file_path = "/no_existent" });
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try testing.expectError(error.FileNotFound, section.content.get(alloc));
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}

‎src/UUID.zig‎

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const std = @import("std");
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const encoded_pos = [16]u8{ 0, 2, 4, 6, 9, 11, 14, 16, 19, 21, 24, 26, 28, 30, 32, 34 };
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const hex = "0123456789abcdef";
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const UUID = @This();
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pub fn new() []const u8 {
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var bytes: [16]u8 = undefined;
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const seed: u64 = @intCast(@as(i128, @bitCast(std.time.nanoTimestamp())));
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var prng = std.rand.DefaultPrng.init(seed);
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prng.random().bytes(&bytes);
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bytes[6] = (bytes[6] & 0x0f) | 0x40;
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bytes[8] = (bytes[8] & 0x3f) | 0x80;
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var buffer: [36]u8 = undefined;
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buffer[8] = '-';
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buffer[13] = '-';
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buffer[18] = '-';
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buffer[23] = '-';
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inline for (encoded_pos, 0..) |i, j| {
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buffer[i + 0] = hex[bytes[j] >> 4];
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buffer[i + 1] = hex[bytes[j] & 0x0f];
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}
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return &buffer;
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}
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test "uuid" {
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const uuid = UUID.new();
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try std.testing.expect(uuid.len == 36);
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try std.testing.expect(uuid[8] == '-');
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try std.testing.expect(uuid[13] == '-');
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try std.testing.expect(uuid[18] == '-');
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try std.testing.expect(uuid[23] == '-');
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}

‎src/root.zig‎

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const std = @import("std");
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const testing = std.testing;
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pub const Epub = @import("Epub.zig");
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pub const Section = @import("Section.zig");
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pub const UUID = @import("UUID.zig");
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test {
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testing.refAllDecls(@This());
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}

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