feature: Generate an EPUB that mupdf can read

7 files changed, 609 insertions, 55 deletions

diff --git a/.gitignore b/.gitignore
index 53eaa21..5c09e9c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 /target
 **/*.rs.bk
+
+/_build
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
index 7353bb6..b7f37c2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,9 +1,11 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "ansi_term"
 version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -11,78 +13,110 @@ name = "atty"
 version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termion 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "bitflags"
-version = "1.0.4"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "celtchar"
 version = "0.1.0"
 dependencies = [
- "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ogmarkup 0.1.0 (git+https://git.sr.ht/~lthms/ogmarkup/?rev=326b6e7c0d4ad366d7ecb6358aae742d9533fb63)",
- "toml 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ogmarkup 0.1.0 (git+https://git.sr.ht/~lthms/ogmarkup/?rev=feaf8d0cbc7aa34ac521020914df91489ef24595)",
+ "serde 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)",
+ "toml 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "cfg-if"
-version = "0.1.6"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "clap"
-version = "2.32.0"
+version = "2.33.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "textwrap 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
+name = "lexical-core"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ryu 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "stackvector 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "static_assertions 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "libc"
-version = "0.2.43"
+version = "0.2.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "memchr"
-version = "2.1.1"
+version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "nom"
-version = "4.1.1"
+version = "5.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "memchr 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lexical-core 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
+name = "numtoa"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "ogmarkup"
 version = "0.1.0"
-source = "git+https://git.sr.ht/~lthms/ogmarkup/?rev=326b6e7c0d4ad366d7ecb6358aae742d9533fb63#326b6e7c0d4ad366d7ecb6358aae742d9533fb63"
+source = "git+https://git.sr.ht/~lthms/ogmarkup/?rev=feaf8d0cbc7aa34ac521020914df91489ef24595#feaf8d0cbc7aa34ac521020914df91489ef24595"
+dependencies = [
+ "nom 5.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "0.4.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "nom 4.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "quote"
+version = "0.6.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "redox_syscall"
-version = "0.1.40"
+version = "0.1.54"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -90,32 +124,93 @@ name = "redox_termios"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rustc_version"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "ryu"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "semver"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
+name = "semver-parser"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "serde"
-version = "1.0.80"
+version = "1.0.92"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "serde_derive"
+version = "1.0.92"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.35 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "stackvector"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "static_assertions"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "strsim"
-version = "0.7.0"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "syn"
+version = "0.15.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "termion"
-version = "1.5.1"
+version = "1.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)",
+ "numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "textwrap"
-version = "0.10.0"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -123,10 +218,10 @@ dependencies = [
 
 [[package]]
 name = "toml"
-version = "0.4.8"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -135,6 +230,19 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "unicode-xid"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "unreachable"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "vec_map"
 version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -145,8 +253,13 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "void"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "winapi"
-version = "0.3.6"
+version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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@@ -166,23 +279,38 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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+"checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
+"checksum winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "f10e386af2b13e47c89e7236a7a14a086791a2b88ebad6df9bf42040195cf770"
 "checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
index c957747..dc90935 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,9 +4,11 @@ version = "0.1.0"
 authors = ["Thomas Letan <contact@thomasletan.fr>"]
 
 [dependencies]
-toml = "0.4"
-clap = "2.32"
+toml = "0.5"
+clap = "2.33"
+serde = "1.0"
+serde_derive = "1.0"
 
 [dependencies.ogmarkup]
 git = "https://git.sr.ht/~lthms/ogmarkup/"
-rev = "326b6e7c0d4ad366d7ecb6358aae742d9533fb63"
\ No newline at end of file
+rev = "feaf8d0cbc7aa34ac521020914df91489ef24595"
\ No newline at end of file
diff --git a/src/epub.rs b/src/epub.rs
new file mode 100644
index 0000000..191f487
--- /dev/null
+++ b/src/epub.rs
@@ -0,0 +1,108 @@
+use crate::project::{Error, Project, Chapter};
+use std::fs::{create_dir, create_dir_all};
+use std::path::PathBuf;
+
+const EPUB_MIMETYPE: &'static str = "application/epub+zip";
+const CONTAINER_XML: &'static str = r#"<?xml version="1.0"?>
+<container xmlns="urn:oasis:names:tc:opendocument:xmlns:container" version="1.0">
+  <rootfiles>
+    <rootfile full-path="OEBPS/content.opf" media-type="application/oebps-package+xml"/>
+  </rootfiles>
+</container>"#;
+
+fn create_mimetype() -> Result<(), Error> {
+    std::fs::write("mimetype", EPUB_MIMETYPE)
+        .map_err(|_| Error(String::from("cannot create mimetype")))?;
+
+    Ok(())
+}
+
+fn create_container() -> Result<(), Error> {
+    create_dir("META-INF")
+        .map_err(|_| Error(String::from("cannot create META-INF")))?;
+
+    std::fs::write("META-INF/container.xml", CONTAINER_XML)
+        .map_err(|_| Error(String::from("cannot create container.xml")))?;
+
+    Ok(())
+}
+
+fn create_chapters(chapters : &Vec<Chapter<String>>) -> Result<Vec<String>, Error> {
+
+    chapters.iter().enumerate()
+        .map(|(idx, c)| {
+            let path : String = format!("{}.xhtml", idx);
+            std::fs::write(
+                PathBuf::from(format!("OEBPS/Text/{}", path)).as_path(),
+                format!(
+                    "<html><head></head><body>{}</body></html>",
+                    c.content.as_str()
+                )
+            )
+                .map_err(|_| Error(format!("cannot create {:?}", path)))?;
+
+            Ok(path)
+        })
+        .collect::<Result<Vec<String>, Error>>()
+}
+
+pub fn generate(project : &Project<String>) -> Result<(), Error> {
+    create_mimetype()?;
+    create_container()?;
+
+    create_dir_all("OEBPS/Text")
+        .map_err(|_| Error(String::from("cannot create OEBPS")))?;
+
+    let files = create_chapters(&project.chapters)?;
+
+    let mut filesxml = String::from("");
+    for f in files.iter() {
+        filesxml.push_str(
+            format!(
+                r#"<item href="Text/{}" id="{}" media-type="application/xhtml+xml" />"#,
+                f, f
+            ).as_str()
+        );
+    }
+
+    let mut spine = String::from("");
+    for f in files.iter() {
+        spine.push_str(
+            format!(
+                r#"<itemref idref="{}" />"#,
+                f
+            ).as_str()
+        );
+    }
+
+    std::fs::write(
+        "OEBPS/content.opf",
+        format!(
+            r#"<?xml version="1.0" encoding="utf-8" standalone="yes"?>
+<package xmlns="http://www.idpf.org/2007/opf" unique-identifier="BookId" version="2.0" xmlns:opf="http://www.idpf.org/2007/opf">
+  <metadata xmlns:dc="http://purl.org/dc/elements/1.1/">
+    <dc:title>{}</dc:title>
+    <dc:language>fr</dc:language>
+    <dc:creator opf:role="aut">{}</dc:creator>
+    <dc:type>text</dc:type>
+    <dc:description>Ceci est une description</dc:description>
+  </metadata>
+  <manifest>
+    <item href="toc.ncx" id="ncx" media-type="application/x-dtbncx+xml" />
+    {}
+  </manifest>
+  <spine toc="ncxtoc">
+    {}
+  </spine>
+</package>
+"#,
+            project.title,
+            project.author,
+            filesxml,
+            spine
+        )
+    )
+        .map_err(|_| Error(String::from("cannot create content.opf")))?;
+
+    Ok(())
+}
diff --git a/src/main.rs b/src/main.rs
index 7b9cae8..112efb0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,20 +1,64 @@
 extern crate clap;
+extern crate ogmarkup;
+extern crate serde_derive;
+extern crate toml;
 
 use clap::{App, SubCommand};
 
-fn main() {
+pub mod render;
+pub mod project;
+pub mod epub;
+
+use project::{Project, Error};
+use ogmarkup::typography::FRENCH;
+
+use std::fs::{create_dir, remove_dir_all};
+
+const BUILD_DIR : &'static str = "_build";
+
+fn cd_clean_build_dir() -> Result<(), Error> {
+    remove_dir_all(BUILD_DIR)
+        .map_err(|_| Error(String::from("cannot clean up _build/")))?;
+
+    create_dir(BUILD_DIR)
+        .map_err(|_| Error(String::from("cannot create _build/")))?;
+
+    std::env::set_current_dir(BUILD_DIR)
+        .map_err(|_| Error(String::from("cannot set current directory to _build")))?;
+
+    Ok(())
+}
+
+pub fn build() -> Result<(), Error> {
+    Project::cd_root()?;
+
+    let project = Project::find_project()?
+        .load_and_render(&FRENCH)?;
+
+    cd_clean_build_dir()?;
+
+    epub::generate(&project)?;
+
+    Ok(())
+}
+
+fn main() -> Result<(), Error> {
     let matches = App::new("celtchar")
         .version("0.1")
         .author("Thomas Letan")
         .about("A tool to generate novels")
         .subcommand(SubCommand::with_name("new")
                     .about("Create a new celtchar document"))
+        .subcommand(SubCommand::with_name("build")
+                    .about("Build a celtchar document"))
         .get_matches();
 
     let (subcommand, _args) = matches.subcommand();
 
     match subcommand {
-        "new" => println!("Hello, world!"),
-        _     => println!("meh"),
+        "build"  => build()?,
+        _        => unimplemented!(),
     }
+
+    Ok(())
 }
diff --git a/src/project.rs b/src/project.rs
new file mode 100644
index 0000000..0bf35a9
--- /dev/null
+++ b/src/project.rs
@@ -0,0 +1,121 @@
+use std::fs;
+use std::path::PathBuf;
+use std::env::current_dir;
+
+use serde_derive::Deserialize;
+
+use ogmarkup::typography::Typography;
+
+use crate::render::Html;
+
+const PROJECT_FILE: &'static str = "Book.toml";
+
+#[derive(Debug)]
+pub struct Error(pub String);
+
+#[derive(Debug, Deserialize)]
+pub struct Chapter<A> {
+    pub title: String,
+    pub content: A,
+}
+
+fn compile_file <'input, T> (
+    path : PathBuf,
+    typo : &T,
+) -> Result<String, Error>
+where
+    T : Typography,
+{
+    let input = fs::read_to_string(path.as_path()).map_err(|_| Error(format!("cannot open {:?}", path)))?;
+
+    ogmarkup::compile(input.as_str(), typo)
+        .map(|x: Html| x.to_string())
+        .map_err(|_| Error(format!("cannot render {:?}", path)))
+}
+
+impl Chapter<Vec<PathBuf>> {
+    pub fn load_and_render <'input, T> (
+        self,
+        typo : &T,
+    ) -> Result<Chapter<String>, Error>
+    where
+        T : Typography
+    {
+
+        self.content.iter()
+            .map(|path| compile_file(path.to_path_buf(), typo))
+            .collect::<Result<Vec<String>, Error>>()
+            .map(|x| Chapter {
+                title: self.title,
+                content: x.join(""),
+            })
+    }
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Project<A> {
+    pub author: String,
+    pub title: String,
+    pub chapters: Vec<Chapter<A>>
+}
+
+impl Project<Vec<PathBuf>> {
+    pub fn cd_root() -> Result<(), Error> {
+        let mut cwd: PathBuf = current_dir()
+            .map_err(|_| Error(String::from("cannot get current directory")))?;
+
+        loop {
+            cwd.push(PROJECT_FILE); // (*)
+
+            if cwd.exists() {
+                cwd.pop();
+
+                std::env::set_current_dir(cwd.as_path())
+                    .map_err(|_| Error(format!("cannot set current directory to {:?}", cwd)))?;
+
+                return Ok(());
+            } else {
+                // We `pop` a first time for `Book.toml`, since we have pushed
+                // previously it (see (*))
+                cwd.pop();
+
+                // We `pop` a second time to get the parent directory of cwd.  If
+                // `pop` returns false, we are at the root of the current FS, and
+                // there is no project file to find.
+                if !cwd.pop() {
+                    return Err(Error(String::from("could not find Book.toml")))
+                }
+            }
+        }
+    }
+
+    /// This function tries to open `./Book.toml`.  If it succeeds, it tries to
+    /// read it as a TOML file.
+    pub fn find_project() -> Result<Self, Error> {
+        let input = fs::read_to_string(PROJECT_FILE)
+            .map_err(|_| Error(String::from("found Book.toml, but cannot read it")))?;
+
+        return toml::from_str(input.as_str())
+            .map_err(|e| Error(String::from(format!("toml error: {:?}", e))));
+    }
+
+    pub fn load_and_render<'input, T> (
+        self,
+        typo : &T,
+    ) -> Result<Project<String>, Error>
+    where
+        T : Typography
+    {
+        let author = self.author;
+        let title = self.title;
+
+        self.chapters.into_iter()
+            .map(|chapter| chapter.load_and_render(typo))
+            .collect::<Result<Vec<Chapter<String>>, Error>>()
+            .map(|x| Project {
+                author: author,
+                title: title,
+                chapters: x
+            })
+    }
+}
diff --git a/src/render.rs b/src/render.rs
new file mode 100644
index 0000000..3e737b0
--- /dev/null
+++ b/src/render.rs
@@ -0,0 +1,149 @@
+use ogmarkup::typography::Space;
+use ogmarkup::generator::Output;
+
+pub struct Html(String);
+
+impl Html {
+    fn push_str(&mut self, s: &str) -> () {
+        self.0.push_str(s);
+    }
+
+    pub fn to_string(self) -> String {
+        self.0
+    }
+}
+
+impl Output for Html {
+    fn empty(input_size: usize) -> Html {
+        Html(String::with_capacity((15 * input_size) / 10))
+    }
+
+    fn render_space(&mut self, space: Space) -> () {
+        self.push_str(match space {
+            Space::Normal => " ",
+            Space::Nbsp => "&nbsp;",
+            Space::None => "",
+        })
+    }
+
+    fn render_word(&mut self, word: & str) -> () {
+        self.push_str(word)
+    }
+
+    fn render_mark(&mut self, mark: &str) -> () {
+        self.push_str(mark)
+    }
+
+    fn render_illformed(&mut self, err: &str) -> () {
+        self.push_str(err)
+    }
+
+    fn emph_template<F>(&mut self, format: F) -> ()
+    where
+        F : FnOnce(&mut Html) -> ()
+    {
+        self.push_str("<em>");
+        format(self);
+        self.push_str("</em>");
+    }
+
+    fn strong_emph_template<F>(&mut self, format: F) -> ()
+    where
+        F : FnOnce(&mut Html) -> ()
+    {
+        self.push_str("<strong>");
+        format(self);
+        self.push_str("</strong>");
+    }
+
+    fn reply_template<F>(&mut self, reply: F, _author: &Option<&str>) -> ()
+    where
+        F : FnOnce(&mut Html) -> ()
+    {
+        self.push_str("<span class=\"reply\">");
+        reply(self);
+        self.push_str("</span>");
+    }
+
+    fn thought_template<F>(&mut self, reply: F, author: &Option<&str>) -> ()
+    where
+        F : FnOnce(&mut Html) -> ()
+    {
+        self.push_str("<span class=\"thought");
+        author.map(|a| {
+            self.push_str(" by-");
+            self.push_str(a);
+        });
+        self.push_str("\">");
+        reply(self);
+        self.push_str("</span>");
+    }
+
+    fn dialogue_template<F>(&mut self, reply: F, author: &Option<&str>) -> ()
+    where
+        F : FnOnce(&mut Html) -> ()
+    {
+        self.push_str("<span class=\"dialogue");
+        author.map(|a| {
+            self.push_str(" by-");
+            self.push_str(a);
+        });
+        self.push_str("\">");
+        reply(self);
+        self.push_str("</span>");
+    }
+
+    fn between_dialogue(&mut self) -> () {
+        self.push_str("</p><p>");
+    }
+
+    fn illformed_inline_template<F>(&mut self, err: F) -> ()
+    where
+        F: FnOnce(&mut Html) -> ()
+    {
+        self.push_str("<span class=\"illformed_inline\">");
+        err(self);
+        self.push_str("</span>");
+    }
+
+    fn paragraph_template<F>(&mut self, para: F) -> ()
+    where
+        F : FnOnce(&mut Html) -> ()
+    {
+        self.push_str("<p>");
+        para(self);
+        self.push_str("</p>");
+    }
+
+    fn illformed_block_template<F>(&mut self, err: F) -> ()
+    where
+        F : FnOnce(&mut Html) -> ()
+    {
+        self.push_str("<div class=\"illformed_block\">");
+        err(self);
+        self.push_str("</div>");
+    }
+
+    fn story_template<F>(&mut self, story: F) -> ()
+    where
+        F : FnOnce(&mut Html) -> ()
+    {
+        self.push_str("<div class=\"story\">");
+        story(self);
+        self.push_str("</div>");
+    }
+
+    fn aside_template<F>(&mut self, cls: &Option<&str>, aside: F) -> ()
+    where
+        F : FnOnce(&mut Html) -> ()
+    {
+        self.push_str("<div class=\"aside");
+        cls.map(|c| {
+            self.push_str(" ");
+            self.push_str(c);
+        });
+        self.push_str("\">");
+        aside(self);
+        self.push_str("</div>");
+    }
+}