chore: Abstract away the loading process of a Book project

At some point, we will want to create a website to write ogmarkup
document in a collaborative manner. To prepare that time, we abstract
away the loading process of a Book project with a dedicated trait.

In addition, the project is now divided into a library on the one
hand, and the celtchar executable on the other hand. The celtchar
executable uses its own implementation of the [Loader] trait to load a
Book project from the filesystem, as before. This means, currently,
the related functions are not provided by the celtchar library.

13 files changed, 302 insertions, 1135 deletions

diff --git a/.gitignore b/.gitignore
index 5c09e9c..2f88dba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
 /target
 **/*.rs.bk
-
-/_build
\ No newline at end of file
+Cargo.lock
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
deleted file mode 100644
index a50f628..0000000
--- a/Cargo.lock
+++ /dev/null
@@ -1,847 +0,0 @@
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diff --git a/Cargo.toml b/Cargo.toml
index d05a914..3d05405 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,17 +1,2 @@
-[package]
-name = "celtchar"
-version = "0.1.0"
-authors = ["Thomas Letan <contact@thomasletan.fr>"]
-
-[dependencies]
-toml = "0.5"
-clap = "2.33"
-serde = "1.0"
-serde_derive = "1.0"
-serde_json = "1.0"
-tera = "0.11"
-zip = "0.5"
-
-[dependencies.ogmarkup]
-git = "https://git.sr.ht/~lthms/ogmarkup/"
-rev = "feaf8d0cbc7aa34ac521020914df91489ef24595"
\ No newline at end of file
+[workspace]
+members = [ 'lib', 'app' ]
\ No newline at end of file
diff --git a/app/Cargo.toml b/app/Cargo.toml
new file mode 100644
index 0000000..90ececf
--- /dev/null
+++ b/app/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "celtchar"
+version = "0.1.0"
+authors = ["Thomas Letan <contact@thomasletan.fr>"]
+
+[dependencies]
+toml = "0.5"
+clap = "2.33"
+serde = "1.0"
+serde_derive = "1.0"
+serde_json = "1.0"
+tera = "0.11"
+zip = "0.5"
+libceltchar = { version = "0.1",  path = "../lib" }
+ogmarkup = { version = "0.1", git = "https://git.sr.ht/~lthms/ogmarkup" }
\ No newline at end of file
diff --git a/app/src/filesystem.rs b/app/src/filesystem.rs
new file mode 100644
index 0000000..7c07219
--- /dev/null
+++ b/app/src/filesystem.rs
@@ -0,0 +1,114 @@
+use std::path::{PathBuf};
+use std::fs;
+use std::fs::{canonicalize};
+use std::env::{current_dir, set_current_dir};
+
+use libceltchar::{Loader, Raise, Error, Project, Chapter, Cover};
+
+const PROJECT_FILE : &str = "Book.toml";
+pub struct Fs;
+
+pub fn find_root() -> Result<PathBuf, Error> {
+    let mut cwd: PathBuf = current_dir().or_raise("cannot get current directory")?;
+
+    loop {
+        cwd.push(PROJECT_FILE); // (*)
+
+        if cwd.exists() {
+            cwd.pop(); // we pop the `Book.toml` previously pushed (see (*))
+
+            return Ok(cwd);
+        } 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::new("could not find Book.toml"))
+            }
+        }
+    }
+}
+
+fn canonicalize_chapter(
+    chapter : &Chapter<Vec<PathBuf>>
+) -> Result<Chapter<Vec<PathBuf>>, Error> {
+    let title = chapter.title.clone();
+    Ok(Chapter {
+        title: title,
+        content: chapter.content
+            .iter()
+            .map(|x| canonicalize(x).or_raise(&format!("Could not canonicalize {:?}", x)))
+            .collect::<Result<_, Error>>()?
+    })
+}
+
+fn canonicalize_project(
+    project : Project<PathBuf, Vec<PathBuf>>
+) -> Result<Project<PathBuf, Vec<PathBuf>>, Error> {
+    Ok(Project {
+        author: project.author,
+        title: project.title,
+        cover: project.cover.map(canonicalize)
+            .map_or(Ok(None), |r| r.map(Some))
+            .or_raise("…")?,
+        numbering: project.numbering,
+        chapters: project.chapters.iter().map(canonicalize_chapter)
+            .collect::<Result<_, Error>>()?
+    })
+}
+
+impl Loader for Fs {
+    type ProjId = PathBuf;
+    type CovId = PathBuf;
+    type DocId = PathBuf;
+
+    fn load_project(
+        &self,
+        id : &PathBuf
+    ) -> Result<Project<PathBuf, Vec<PathBuf>>, Error> {
+        let cwd = current_dir().or_raise("could not get current dir")?;
+
+        let input = fs::read_to_string(PROJECT_FILE)
+            .or_raise("found Book.toml, but cannot read it")?;
+
+        // We have to modify set the current directory to the PROJECT_FILE directory,
+        // otherwise `canonicalize` will not work.
+        set_current_dir(id).or_raise("could not change the current directory")?;
+        let res = canonicalize_project(
+            toml::from_str(input.as_str())
+                .or_raise(&format!("could not parse Book.toml"))?
+        )?;
+        set_current_dir(cwd).or_raise("could not change the current directory")?;
+
+        Ok(res)
+    }
+
+    fn load_cover(
+        &self,
+        id : &PathBuf
+    ) -> Result<Cover, Error> {
+        let extension = id.extension()
+            .or_raise("cover lacks an extension")?
+            .to_str()
+            .or_raise("cover extension is not valid utf-8")?;
+
+        let content = fs::read(id)
+            .or_raise(&format!("could not read cover from {:?}", id))?;
+
+        Ok(Cover {
+            extension: String::from(extension),
+            content: content,
+        })
+    }
+
+    fn load_document(
+        &self,
+        id : &PathBuf
+    ) -> Result<String, Error> {
+        fs::read_to_string(id).or_raise(&format!("Could not read {:?}", id))
+    }
+}
diff --git a/src/main.rs b/app/src/main.rs
index d95e119..52d590d 100644
--- a/src/main.rs
+++ b/app/src/main.rs
@@ -1,46 +1,36 @@
 extern crate clap;
-extern crate ogmarkup;
-extern crate serde_derive;
 extern crate serde_json;
 extern crate toml;
-#[macro_use]
+extern crate libceltchar;
+extern crate ogmarkup;
 extern crate tera;
-extern crate zip;
+
+use std::path::PathBuf;
 
 use clap::{App, SubCommand};
 
-pub mod error;
-pub mod render;
-pub mod project;
-pub mod epub;
+use ogmarkup::typography::FRENCH;
 
-use std::path::PathBuf;
+use libceltchar::{Error, Zip, EpubWriter, Loader};
 
 #[cfg(debug_assertions)]
 use std::env::current_dir;
 #[cfg(debug_assertions)]
-use error::Raise;
-
-use ogmarkup::typography::FRENCH;
+use libceltchar::Raise;
 
-use error::Error;
-use project::Project;
-use epub::{Zip, Fs};
+mod filesystem;
+use crate::filesystem::{find_root, Fs};
 
-use epub::EpubWriter;
+fn build(assets : &PathBuf) -> Result<(), Error> {
+    let root = find_root()?;
+    let loader = Fs;
 
-pub fn build(assets : &PathBuf) -> Result<(), Error> {
-    Project::cd_root()?;
-
-    let project = Project::find_project()?
-        .load_and_render(&FRENCH)?;
+    let project = loader.load_project(&root)?
+        .load_and_render(&loader, &FRENCH)?;
 
     let mut zip_writer = Zip::init()?;
     zip_writer.generate(&project, assets)?;
 
-    let mut fs_writer = Fs::init()?;
-    fs_writer.generate(&project, assets)?;
-
     Ok(())
 }
 
diff --git a/lib/Cargo.toml b/lib/Cargo.toml
new file mode 100644
index 0000000..3786d25
--- /dev/null
+++ b/lib/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "libceltchar"
+version = "0.1.0"
+authors = ["Thomas Letan <contact@thomasletan.fr>"]
+
+[dependencies]
+serde = "1.0"
+serde_derive = "1.0"
+serde_json = "1.0"
+tera = "0.11"
+zip = "0.5"
+ogmarkup = { version = "0.1", git = "https://git.sr.ht/~lthms/ogmarkup" }
\ No newline at end of file
diff --git a/src/epub.rs b/lib/src/epub.rs
index a6f09e5..daa3446 100644
--- a/src/epub.rs
+++ b/lib/src/epub.rs
@@ -1,15 +1,12 @@
-use std::env::set_current_dir;
-use std::fs::{create_dir, remove_dir_all, create_dir_all};
-use std::fs;
 use std::io::{Read, Write};
-use std::path::{Path, PathBuf};
+use std::path::PathBuf;
 
 use serde_json::json;
 
 use tera::{Tera, Context};
 
 use crate::error::{Raise, Error};
-use crate::project::{Project, Chapter};
+use crate::project::{Project, Chapter, Cover};
 
 use zip::write::FileOptions;
 use zip::ZipWriter;
@@ -25,22 +22,27 @@ pub trait EpubWriter {
         tera : & Tera,
         template : &str,
         ctx : &Context,
-    ) -> Result<(), Error> ;
+    ) -> Result<(), Error> {
+        let content = tera.render(template, ctx)
+            .or_raise(&format!("cannot render {}", template))?;
+
+        self.write_bytes(dst, content.as_bytes())
+    }
 
     fn write_file(
         &mut self,
         dst : &PathBuf,
         src : &PathBuf,
-    ) -> Result<(), Error> ;
+    ) -> Result<(), Error>;
 
-    fn write_str(
+    fn write_bytes(
         &mut self,
         dst : &PathBuf,
-        input : &str
+        input : &[u8]
     ) -> Result<(), Error> ;
 
     fn create_mimetype(&mut self) -> Result<(), Error> {
-        self.write_str(&PathBuf::from("mimetype"), EPUB_MIMETYPE)
+        self.write_bytes(&PathBuf::from("mimetype"), EPUB_MIMETYPE.as_bytes())
     }
 
     fn create_container(&mut self, tera : &Tera) -> Result<(), Error> {
@@ -92,20 +94,12 @@ pub trait EpubWriter {
         Ok(())
     }
 
-    fn install_cover(&mut self, cover : &PathBuf) -> Result<String, Error> {
-        let extension = cover.extension()
-            .or_raise("cover lacks an extension")?
-            .to_str()
-            .or_raise("cover extension is not valid utf-8")?;
-
-        let dst = PathBuf::from("OEBPS").join(format!("cover.{}", extension));
-
-        self.write_file(&dst, cover)?;
-
-        Ok(extension.into())
+    fn install_cover(&mut self, cover : &Cover) -> Result<(), Error> {
+        let dst = PathBuf::from("OEBPS").join(format!("cover.{}", cover.extension));
+        self.write_bytes(&dst, cover.content.as_slice())
     }
 
-    fn generate(&mut self, project : &Project<String>, assets : &PathBuf) -> Result<(), Error> {
+    fn generate(&mut self, project : &Project<Cover, String>, assets : &PathBuf) -> Result<(), Error> {
 
         let tera = compile_templates!(template_dir(assets)?.as_str());
 
@@ -121,9 +115,9 @@ pub trait EpubWriter {
             &Context::new(),
         )?;
 
-        let cover_extension = project.cover.clone().map(|cov| self.install_cover(&cov))
-        // from Option<Result<_, E>> to Result<Option<_>, E>
-            .map_or(Ok(None), |r| r.map(Some))?;
+        if let Some(ref cov) = project.cover {
+            self.install_cover(cov)?;
+        }
 
         let fonts = vec![
             "et-book-roman-line-figures.ttf",
@@ -140,7 +134,7 @@ pub trait EpubWriter {
         let mut ctx = Context::new();
         ctx.insert("title", &project.title);
         ctx.insert("author", &project.author);
-        ctx.insert("cover_extension", &cover_extension);
+        ctx.insert("cover_extension", &project.cover.as_ref().map(|x| x.extension.clone()));
         ctx.insert("files", &files);
         ctx.insert("fonts", &fonts);
 
@@ -189,72 +183,6 @@ fn fonts_dir(assets : &PathBuf) -> Result<PathBuf, Error> {
     Ok(res)
 }
 
-pub struct Fs;
-
-const BUILD_DIR : &'static str = "_build";
-
-impl Fs {
-    pub fn init() -> Result<Fs, Error> {
-        remove_dir_all(BUILD_DIR).or_raise("cannot clean up _build/")?;
-        create_dir(BUILD_DIR).or_raise("cannot create _build/")?;
-        set_current_dir(BUILD_DIR).or_raise("cannot set current directory to _build/")?;
-
-        Ok(Fs)
-    }
-
-    fn create_parent(&mut self, dst : &PathBuf) -> Result<(), Error> {
-        let directory : &Path = dst.parent().ok_or(Error(String::from("is not a file")))?;
-
-        if !directory.exists() {
-            create_dir_all(directory)
-                .or_raise(&format!("cannot create directory {:?}", directory))?;
-        }
-
-        Ok(())
-    }
-}
-
-impl EpubWriter for Fs {
-    fn write_template(
-        &mut self,
-        dst : &PathBuf,
-        tera : & Tera,
-        template : &str,
-        ctx : &Context,
-    ) -> Result<(), Error> {
-        self.create_parent(dst)?;
-
-        let content = tera.render(template, ctx)
-            .or_raise(&format!("cannot render {}", template))?;
-
-        fs::write(dst, content).or_raise(&format!("cannot create {:?}", dst))?;
-
-        Ok(())
-    }
-
-    fn write_str(
-        &mut self,
-        dst : &PathBuf,
-        input : &str
-    ) -> Result<(), Error> {
-        self.create_parent(dst)?;
-
-        fs::write(dst, input).or_raise(&format!("cannot create {:?}", dst))
-    }
-
-    fn write_file(
-        &mut self,
-        dst : &PathBuf,
-        src : &PathBuf,
-    ) -> Result<(), Error> {
-        self.create_parent(dst)?;
-
-        fs::copy(src, dst).or_raise(&format!("cannot copy {:?} to {:?}", src, dst))?;
-
-        Ok(())
-    }
-}
-
 pub struct Zip {
     output : ZipWriter<File>,
     dirs : HashSet<PathBuf>,
@@ -284,38 +212,17 @@ impl Zip {
 }
 
 impl EpubWriter for Zip {
-    fn write_template(
-        &mut self,
-        dst : &PathBuf,
-        tera : & Tera,
-        template : &str,
-        ctx : &Context,
-    ) -> Result<(), Error> {
-        self.create_parent(dst)?;
-
-        let content = tera.render(template, ctx)
-            .or_raise(&format!("cannot render {}", template))?;
-
-        self.output.start_file_from_path(dst, FileOptions::default())
-            .or_raise(&format!("Could not add file {:?} to archive", dst))?;
-
-        self.output.write_all(content.as_bytes())
-            .or_raise(&format!("Could not write {:?} content", dst))?;
-
-        Ok(())
-    }
-
-    fn write_str(
+    fn write_bytes(
         &mut self,
         dst : &PathBuf,
-        input : &str
+        input : &[u8]
     ) -> Result<(), Error> {
         self.create_parent(dst)?;
 
         self.output.start_file_from_path(dst, FileOptions::default())
             .or_raise(&format!("Could not add file {:?} to archive", dst))?;
 
-        self.output.write_all(input.as_bytes())
+        self.output.write_all(input)
             .or_raise(&format!("Could not write {:?} content", dst))?;
 
         Ok(())
diff --git a/src/error.rs b/lib/src/error.rs
index d92077e..d92077e 100644
--- a/src/error.rs
+++ b/lib/src/error.rs
diff --git a/lib/src/lib.rs b/lib/src/lib.rs
new file mode 100644
index 0000000..e0a9644
--- /dev/null
+++ b/lib/src/lib.rs
@@ -0,0 +1,14 @@
+extern crate ogmarkup;
+#[macro_use] extern crate tera;
+extern crate zip;
+extern crate serde_derive;
+extern crate serde_json;
+
+mod render;
+mod error;
+mod project;
+mod epub;
+
+pub use error::{Error, Raise};
+pub use project::{Project, Chapter, Cover, Loader};
+pub use epub::{EpubWriter, Zip};
diff --git a/lib/src/project.rs b/lib/src/project.rs
new file mode 100644
index 0000000..367aca9
--- /dev/null
+++ b/lib/src/project.rs
@@ -0,0 +1,107 @@
+use ogmarkup::typography::Typography;
+use serde_derive::{Deserialize, Serialize};
+
+use crate::render::Html;
+use crate::error::{Raise, Error};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Cover {
+    pub extension : String,
+    pub content : Vec<u8>,
+}
+
+pub trait Loader {
+    type CovId;
+    type DocId;
+    type ProjId;
+
+    fn load_cover(
+        &self,
+        id : &Self::CovId
+    ) -> Result<Cover, Error>;
+
+    fn load_document(
+        &self,
+        id : &Self::DocId
+    ) -> Result<String, Error>;
+
+    fn load_project(
+        &self,
+        id : &Self::ProjId
+    ) -> Result<Project<Self::CovId, Vec<Self::DocId>>, Error>;
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Chapter<I> {
+    pub title : Option<String>,
+    pub content : I,
+}
+
+impl<I> Chapter<Vec<I>> {
+    fn load_and_render<T, L>(
+        &self,
+        loader : &L,
+        typo : &T,
+    ) -> Result<Chapter<String>, Error>
+    where
+        T : Typography,
+        L : Loader<DocId = I>
+    {
+        let title = &self.title;
+        let content = &self.content;
+
+        let doc = content.iter()
+            .map(|ref x| {
+                let input = loader.load_document(x)?;
+                ogmarkup::compile(&input, typo)
+                    .or_raise("Cannot parse an ogmarkup document for some reason")
+                    .map(Html::to_string)
+            })
+            .collect::<Result<Vec<String>, Error>>()?
+            .join("");
+
+        Ok(Chapter {
+            title: title.clone(),
+            content: doc,
+        })
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Project<C, I> {
+    pub author: String,
+    pub title: String,
+    pub chapters: Vec<Chapter<I>>,
+    pub cover: Option<C>,
+    pub numbering: Option<bool>,
+}
+
+impl<C, I> Project<C, Vec<I>> {
+    pub fn load_and_render<'input, T, L> (
+        self,
+        loader : &L,
+        typo : &T,
+    ) -> Result<Project<Cover, String>, Error>
+    where
+        T : Typography,
+        L : Loader<CovId = C, DocId = I>,
+    {
+        let numbering = self.numbering;
+        let author = self.author;
+        let title = self.title;
+        let cover = self.cover
+            .map(|x| loader.load_cover(&x).or_raise("cannot load the cover"))
+            .map_or(Ok(None), |r| r.map(Some))?;
+
+        self.chapters.into_iter()
+            .map(|chapter| chapter.load_and_render(loader, typo))
+            .collect::<Result<Vec<Chapter<String>>, Error>>()
+            .map(|x| Project {
+                author: author,
+                title: title,
+                chapters: x,
+                cover: cover,
+                numbering: numbering,
+            })
+    }
+}
diff --git a/src/render.rs b/lib/src/render.rs
index 3e737b0..3e737b0 100644
--- a/src/render.rs
+++ b/lib/src/render.rs
diff --git a/src/project.rs b/src/project.rs
deleted file mode 100644
index da8cd35..0000000
--- a/src/project.rs
+++ /dev/null
@@ -1,129 +0,0 @@
-use std::fs;
-use std::path::PathBuf;
-use std::env::{current_dir, set_current_dir};
-
-use serde_derive::{Deserialize, Serialize};
-
-use ogmarkup::typography::Typography;
-
-use crate::render::Html;
-use crate::error::{Raise, Error};
-
-const PROJECT_FILE: &'static str = "Book.toml";
-
-#[derive(Debug, Serialize, Deserialize)]
-pub struct Chapter<A> {
-    pub title: Option<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())
-        .or_raise(&format!("cannot open {:?}", path))?;
-
-    ogmarkup::compile(input.as_str(), typo)
-        .map(|x: Html| x.to_string())
-        .or_raise(&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, Serialize, Deserialize)]
-pub struct Project<A> {
-    pub author: String,
-    pub title: String,
-    pub chapters: Vec<Chapter<A>>,
-    pub cover: Option<PathBuf>,
-    pub numbering: Option<bool>,
-}
-
-impl Project<Vec<PathBuf>> {
-    pub fn cd_root() -> Result<(), Error> {
-        let mut cwd: PathBuf = current_dir().or_raise("cannot get current directory")?;
-
-        loop {
-            cwd.push(PROJECT_FILE); // (*)
-
-            if cwd.exists() {
-                cwd.pop();
-
-                set_current_dir(cwd.as_path())
-                    .or_raise(&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::new("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)
-            .or_raise("found Book.toml, but cannot read it")?;
-
-        toml::from_str(input.as_str())
-            .or_raise(&format!("could not parse Book.toml"))
-    }
-
-    pub fn load_and_render<'input, T> (
-        self,
-        typo : &T,
-    ) -> Result<Project<String>, Error>
-    where
-        T : Typography
-    {
-        let numbering = self.numbering;
-        let author = self.author;
-        let title = self.title;
-        let cover = self.cover
-            .map(|x| fs::canonicalize(&x)
-                 .or_raise("cannot compute a canonical path for the cover"))
-            // from Option<Result<_, E>> to Result<Option<_>, E>
-            .map_or(Ok(None), |r| r.map(Some))?;
-
-        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,
-                cover: cover,
-                numbering: numbering,
-            })
-    }
-}