From 77617f275fba1604beef8a2368e5b7641e1ac9a0 Mon Sep 17 00:00:00 2001
From: trivernis <trivernis@protonmail.com>
Date: Wed, 9 Sep 2020 17:02:32 +0200
Subject: [PATCH] Add EpubWriter

Signed-off-by: trivernis <trivernis@protonmail.com>
---
 Cargo.lock                     | 394 ++++++++++++++++++++++++++++++++-
 Cargo.toml                     |   3 +-
 src/format/epub/epub_writer.rs | 120 ++++++++++
 src/format/epub/mod.rs         |   8 +
 src/format/mod.rs              |   1 +
 5 files changed, 521 insertions(+), 5 deletions(-)
 create mode 100644 src/format/epub/epub_writer.rs
 create mode 100644 src/format/epub/mod.rs

diff --git a/Cargo.lock b/Cargo.lock
index d444440..7af0f35 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,10 +1,23 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+[[package]]
+name = "addr2line"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "gimli 0.22.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "adler"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "adler32"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "aho-corasick"
 version = "0.7.13"
@@ -57,6 +70,19 @@ name = "autocfg"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "backtrace"
+version = "0.3.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "addr2line 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.74 (registry+https://github.com/rust-lang/crates.io-index)",
+ "miniz_oxide 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "object 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "base64"
 version = "0.12.3"
@@ -111,6 +137,25 @@ name = "bytes"
 version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "bzip2"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bzip2-sys 0.1.9+1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.74 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "bzip2-sys"
+version = "0.1.9+1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.58 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.74 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "cc"
 version = "1.0.58"
@@ -311,6 +356,31 @@ dependencies = [
  "termcolor 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "epub-builder"
+version = "0.4.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "chrono 0.4.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "html2text 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mustache 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "uuid 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "zip 0.5.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "error-chain"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace 0.3.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "filetime"
 version = "0.2.12"
@@ -324,13 +394,13 @@ dependencies = [
 
 [[package]]
 name = "flate2"
-version = "1.0.16"
+version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc32fast 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.74 (registry+https://github.com/rust-lang/crates.io-index)",
- "miniz_oxide 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "miniz_oxide 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -368,6 +438,11 @@ dependencies = [
  "libc 0.2.74 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "fuchsia-cprng"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fuchsia-zircon"
 version = "0.3.3"
@@ -382,6 +457,15 @@ name = "fuchsia-zircon-sys"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "futf"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "mac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "new_debug_unreachable 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "futures-channel"
 version = "0.3.5"
@@ -446,6 +530,11 @@ dependencies = [
  "regex 1.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "gimli"
+version = "0.22.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "h2"
 version = "0.2.6"
@@ -488,6 +577,29 @@ dependencies = [
  "libc 0.2.74 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "html2text"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "html5ever 0.25.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "markup5ever_rcdom 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-width 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "html5ever"
+version = "0.25.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "markup5ever 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.38 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "htmlescape"
 version = "0.3.1"
@@ -671,6 +783,14 @@ name = "linked-hash-map"
 version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "log"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "log"
 version = "0.4.11"
@@ -679,11 +799,43 @@ dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "mac"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "maplit"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "markup5ever"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf_codegen 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.57 (registry+https://github.com/rust-lang/crates.io-index)",
+ "string_cache 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "string_cache_codegen 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tendril 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "markup5ever_rcdom"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "html5ever 0.25.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "markup5ever 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tendril 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "xml5ever 0.16.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "matches"
 version = "0.1.8"
@@ -726,6 +878,14 @@ name = "minify"
 version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "miniz_oxide"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "adler32 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "miniz_oxide"
 version = "0.4.0"
@@ -774,6 +934,15 @@ dependencies = [
  "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "mustache"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "native-tls"
 version = "0.2.4"
@@ -801,6 +970,11 @@ dependencies = [
  "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "new_debug_unreachable"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "notify"
 version = "4.0.15"
@@ -849,6 +1023,11 @@ name = "number_prefix"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "object"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "once_cell"
 version = "1.4.0"
@@ -917,6 +1096,24 @@ dependencies = [
  "phf_shared 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "phf_codegen"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "phf_generator 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf_shared 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "phf_generator"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "phf_shared 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "phf_shared"
 version = "0.8.0"
@@ -984,6 +1181,11 @@ name = "ppv-lite86"
 version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "precomputed-hash"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -1027,6 +1229,18 @@ dependencies = [
  "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.74 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand"
 version = "0.7.3"
@@ -1037,6 +1251,7 @@ dependencies = [
  "rand_chacha 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_pcg 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1048,6 +1263,19 @@ dependencies = [
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "rand_core"
 version = "0.5.1"
@@ -1064,6 +1292,14 @@ dependencies = [
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand_pcg"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rayon"
 version = "1.3.1"
@@ -1087,6 +1323,14 @@ dependencies = [
  "num_cpus 1.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rdrand"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.1.57"
@@ -1171,6 +1415,11 @@ dependencies = [
  "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rustc-demangle"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "ryu"
 version = "1.0.5"
@@ -1287,6 +1536,7 @@ dependencies = [
  "colored 1.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "epub-builder 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "gh-emoji 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "htmlescape 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "indicatif 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1319,6 +1569,29 @@ dependencies = [
  "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "string_cache"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "new_debug_unreachable 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf_shared 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "precomputed-hash 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "string_cache_codegen"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "phf_generator 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf_shared 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "strsim"
 version = "0.8.0"
@@ -1363,7 +1636,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bincode 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "flate2 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "flate2 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1377,6 +1650,15 @@ dependencies = [
  "yaml-rust 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tempdir"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "remove_dir_all 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.1.0"
@@ -1390,6 +1672,16 @@ dependencies = [
  "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tendril"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futf 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "utf-8 0.7.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "termcolor"
 version = "1.1.0"
@@ -1423,6 +1715,24 @@ dependencies = [
  "unicode-width 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "thiserror-impl 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.38 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "thread_local"
 version = "1.0.1"
@@ -1569,6 +1879,19 @@ dependencies = [
  "percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "utf-8"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "uuid"
+version = "0.8.1"
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+"checksum precomputed-hash 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
 "checksum proc-macro-error 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
 "checksum proc-macro-error-attr 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
 "checksum proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)" = "04f5f085b5d71e2188cb8271e5da0161ad52c3f227a661a3c135fdf28e258b12"
 "checksum quick-error 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
 "checksum quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)" = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
+"checksum rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "552840b97013b1a26992c11eac34bdd778e464601a4c2054b5f0bff7c6761293"
 "checksum rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 "checksum rand_chacha 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+"checksum rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6fdeb83b075e8266dcc8762c22776f6877a63111121f5f8c7411e5be7eed4b"
+"checksum rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9c33a3c44ca05fa6f1807d8e6743f3824e8509beca625669633be0acbdf509dc"
 "checksum rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
 "checksum rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
+"checksum rand_pcg 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "16abd0c1b639e9eb4d7c50c0b8100b0d0f849be2349829c740fe8e6eb4816429"
 "checksum rayon 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "62f02856753d04e03e26929f820d0a0a337ebe71f849801eea335d464b349080"
 "checksum rayon-core 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e92e15d89083484e11353891f1af602cc661426deb9564c298b270c726973280"
+"checksum rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "678054eb77286b51581ba43620cc911abf02758c91f93f479767aed0f90458b2"
 "checksum redox_syscall 0.1.57 (registry+https://github.com/rust-lang/crates.io-index)" = "41cc0f7e4d5d4544e8861606a285bb08d3e70712ccc7d2b84d7c0ccfaf4b05ce"
 "checksum redox_users 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "de0737333e7a9502c789a36d7c7fa6092a49895d4faa31ca5df163857ded2e9d"
 "checksum regex 1.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "9c3780fcf44b193bc4d09f36d2a3c87b251da4a046c87795a0d35f4f927ad8e6"
@@ -1884,6 +2259,7 @@ dependencies = [
 "checksum remove_dir_all 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3acd125665422973a33ac9d3dd2df85edad0f4ae9b00dafb1a05e43a9f5ef8e7"
 "checksum reqwest 0.10.7 (registry+https://github.com/rust-lang/crates.io-index)" = "12427a5577082c24419c9c417db35cfeb65962efc7675bb6b0d5f1f9d315bfe6"
 "checksum rust-argon2 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9dab61250775933275e84053ac235621dfb739556d5c54a2f2e9313b7cf43a19"
+"checksum rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
 "checksum ryu 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "71d301d4193d031abdd79ff7e3dd721168a9572ef3fe51a1517aba235bd8f86e"
 "checksum safemem 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ef703b7cb59335eae2eb93ceb664c0eb7ea6bf567079d843e09420219668e072"
 "checksum same-file 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
@@ -1899,16 +2275,22 @@ dependencies = [
 "checksum siphasher 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "fa8f3741c7372e75519bd9346068370c9cdaabcc1f9599cbcf2a2719352286b7"
 "checksum slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
 "checksum socket2 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)" = "03088793f677dce356f3ccc2edb1b314ad191ab702a5de3faf49304f7e104918"
+"checksum string_cache 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2940c75beb4e3bf3a494cef919a747a2cb81e52571e212bfbd185074add7208a"
+"checksum string_cache_codegen 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f24c8e5e19d22a726626f1a5e16fe15b132dcf21d10177fa5a45ce7962996b97"
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 "checksum structopt 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)" = "de5472fb24d7e80ae84a7801b7978f95a19ec32cb1876faea59ab711eb901976"
 "checksum structopt-derive 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)" = "1e0eb37335aeeebe51be42e2dc07f031163fbabfa6ac67d7ea68b5c2f68d5f99"
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+"checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
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+"checksum tendril 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "707feda9f2582d5d680d733e38755547a3e8fb471e7ba11452ecfd9ce93a5d3b"
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+"checksum thiserror 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)" = "7dfdd070ccd8ccb78f4ad66bf1982dc37f620ef696c6b5028fe2ed83dd3d0d08"
+"checksum thiserror-impl 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)" = "bd80fc12f73063ac132ac92aceea36734f04a1d93c1240c6944e23a3b8841793"
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@@ -1927,6 +2309,8 @@ dependencies = [
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@@ -1949,4 +2333,6 @@ dependencies = [
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+"checksum zip 0.5.7 (registry+https://github.com/rust-lang/crates.io-index)" = "d30de6e58104bb7b9a94f34b52a2bdabb8a40b678a64201cd0069e3d7119b5ff"
diff --git a/Cargo.toml b/Cargo.toml
index fd88df2..8d2f2cd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -43,4 +43,5 @@ maplit = "1.0.2"
 log = "0.4.11"
 env_logger = "0.7.1"
 indicatif = "0.15.0"
-platform-dirs = "0.2.0"
\ No newline at end of file
+platform-dirs = "0.2.0"
+epub-builder = "0.4.7"
\ No newline at end of file
diff --git a/src/format/epub/epub_writer.rs b/src/format/epub/epub_writer.rs
new file mode 100644
index 0000000..7b6b914
--- /dev/null
+++ b/src/format/epub/epub_writer.rs
@@ -0,0 +1,120 @@
+use epub_builder::{EpubBuilder, EpubContent, ReferenceType, Result, ZipLibrary};
+use std::cmp::max;
+use std::collections::HashMap;
+use std::io;
+use std::io::{Read, Write};
+use std::mem;
+
+#[derive(Clone, Debug, PartialOrd, PartialEq)]
+struct Buffer {
+    pub inner: Vec<u8>,
+}
+
+impl Default for Buffer {
+    fn default() -> Self {
+        Self { inner: Vec::new() }
+    }
+}
+
+impl Read for Buffer {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        let length = buf.len();
+        let available = self.inner.len();
+        let writable = max(length, available);
+        buf.copy_from_slice(&self.inner[0..writable]);
+        self.inner = self.inner[writable..self.inner.len()].to_vec();
+
+        Ok(writable)
+    }
+}
+
+pub struct EpubWriter {
+    inner: Box<dyn Write>,
+    builder: EpubBuilder<ZipLibrary>,
+    content_begin: bool,
+    sections: Vec<Box<EpubContent<Buffer>>>,
+    content_buffer: Buffer,
+    section_level: u8,
+    section_count: HashMap<u8, usize>,
+}
+
+impl EpubWriter {
+    pub fn new(writer: Box<dyn Write>) -> Result<Self> {
+        Ok(Self {
+            inner: writer,
+            builder: EpubBuilder::new(ZipLibrary::new()?)?,
+            content_begin: false,
+            sections: Vec::new(),
+            content_buffer: Buffer::default(),
+            section_count: HashMap::new(),
+            section_level: 0,
+        })
+    }
+
+    /// Sets the metadata of the Epub File
+    pub fn metadata(&mut self, key: &str, value: &str) -> Result<()> {
+        self.builder.metadata(key, value)?;
+
+        Ok(())
+    }
+
+    /// Sets the stylesheet of the epub
+    pub fn stylesheet(&mut self, style: &String) -> Result<()> {
+        self.builder.stylesheet(style.as_bytes())?;
+
+        Ok(())
+    }
+
+    /// Adds a resource
+    pub fn resource(&mut self, path: &str, resource: Vec<u8>, mimetype: &str) -> Result<()> {
+        self.builder
+            .add_resource(path, resource.as_slice(), mimetype)?;
+
+        Ok(())
+    }
+
+    /// adds a section
+    pub fn section(&mut self, level: u8, title: String) -> Result<()> {
+        if self.section_level >= level {
+            if let Some(mut section) = self.sections.pop() {
+                section.content = mem::replace(&mut self.content_buffer, Buffer::default());
+                self.builder.add_content(*section)?;
+            }
+        }
+        let mut section = EpubContent::new(
+            format!("{}.xhtml", self.next_section_name(level),),
+            Buffer::default(),
+        )
+        .title(title)
+        .level(level as i32);
+        if !self.content_begin {
+            section = section.reftype(ReferenceType::Text);
+        }
+        self.sections.push(Box::new(section));
+        self.section_level = level;
+
+        Ok(())
+    }
+
+    /// Adds (string) content to the epub file
+    pub fn content(&mut self, content: String) {
+        self.content_buffer
+            .inner
+            .append(&mut content.as_bytes().to_vec());
+    }
+
+    /// Finishes writing the epub
+    pub fn finish(&mut self) -> Result<()> {
+        self.builder.generate(&mut self.inner)?;
+
+        Ok(())
+    }
+
+    /// Returns the next section name for a section level
+    fn next_section_name(&mut self, level: u8) -> String {
+        let count = *self.section_count.get(&level).unwrap_or(&1);
+        self.section_count.insert(level, count);
+
+        format!("s{}_{}", level, count)
+    }
+}
diff --git a/src/format/epub/mod.rs b/src/format/epub/mod.rs
new file mode 100644
index 0000000..4d5fa8b
--- /dev/null
+++ b/src/format/epub/mod.rs
@@ -0,0 +1,8 @@
+use crate::format::epub::epub_writer::EpubWriter;
+use std::io;
+
+pub mod epub_writer;
+
+pub trait ToEpub {
+    fn to_epub(&self, writer: &EpubWriter) -> io::Result<()>;
+}
diff --git a/src/format/mod.rs b/src/format/mod.rs
index af04881..cd6970e 100644
--- a/src/format/mod.rs
+++ b/src/format/mod.rs
@@ -1,6 +1,7 @@
 use regex::Regex;
 use std::collections::HashMap;
 
+pub mod epub;
 pub mod html;
 
 pub struct PlaceholderTemplate {