From 749af017cad8fc5a6e861346e45a94cc26a785c1 Mon Sep 17 00:00:00 2001
From: Maverick Liu <maverick.liu42@gmail.com>
Date: Fri, 21 Feb 2025 17:04:00 +0800
Subject: [PATCH] init

---
 .gitignore  |   2 +
 Cargo.lock  | 881 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |  10 +
 README.md   |  22 ++
 src/lib.rs  | 125 ++++++++
 src/main.rs |  21 ++
 6 files changed, 1061 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 README.md
 create mode 100644 src/lib.rs
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f7095b7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
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\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..08e5f2d
--- /dev/null
+++ b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..0f66d43
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "epub2mdbook"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = "1.0.96"
+clap = { version = "4.5.30", features = ["derive"] }
+epub = "2.1.1"
+html2md = "0.2.15"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c9a6a3d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,22 @@
+# EPUB to MDBook Converter
+
+This is a powerful tool to convert EPUB files to MDBook format.
+
+## Usage
+
+### CLI
+
+```bash
+cargo run -- --input-epub-path path/to/input.epub --output-dir path/to/output
+```
+
+### Rust
+
+```rust
+use epub2mdbook::convert_epub_to_mdbook;
+
+convert_epub_to_mdbook(
+    PathBuf::from("path/to/input.epub"),
+    Some(PathBuf::from("path/to/output")),
+);
+```
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..449e184
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,125 @@
+use epub::doc::{EpubDoc, NavPoint};
+use html2md::parse_html;
+use std::collections::HashMap;
+use std::fs;
+use std::io::{Read, Seek};
+use std::path::{Path, PathBuf};
+
+pub fn convert_epub_to_mdbook(
+    epub_path: impl AsRef<Path>,
+    output_dir: Option<impl AsRef<Path>>,
+) -> anyhow::Result<()> {
+    let book_name = epub_path.as_ref().with_extension("");
+    let book_name = book_name.file_name().unwrap().to_str().unwrap();
+    let pwd = PathBuf::from(".");
+    let output_dir = match output_dir {
+        Some(output_dir) => output_dir.as_ref().join(book_name),
+        None => pwd.join(book_name),
+    };
+
+    fs::create_dir_all(output_dir.join("src"))?;
+
+    let mut doc = EpubDoc::new(&epub_path)?;
+    let title = if let Some(title) = doc.metadata.get("title") {
+        title.first().unwrap_or(&book_name.to_string()).clone()
+    } else {
+        book_name.to_string()
+    };
+    let creator = doc.metadata.get("creator").and_then(|v| v.first().cloned());
+
+    let (toc, html_files) = toc_to_md(&doc, &title)?;
+    fs::write(output_dir.join("src/SUMMARY.md"), toc)?;
+
+    extract_chapters_and_resources(&mut doc, &output_dir, &html_files)?;
+    write_book_toml(&output_dir, &title, creator)?;
+    Ok(())
+}
+
+pub fn nav_point_to_md(
+    nav: &NavPoint,
+    indent: usize,
+    html_files: &HashMap<PathBuf, PathBuf>,
+) -> Option<String> {
+    let file = html_files.get(&nav.content)?;
+    let mut md = format!(
+        "{}- [{}]({})\n",
+        "  ".repeat(indent),
+        nav.label,
+        file.to_str()?
+    );
+    for child in &nav.children {
+        if let Some(child_md) = nav_point_to_md(child, indent + 1, html_files) {
+            md.push_str(&child_md);
+        }
+    }
+    Some(md)
+}
+
+pub fn toc_to_md<R: Read + Seek>(
+    doc: &EpubDoc<R>,
+    title: &str,
+) -> anyhow::Result<(String, HashMap<PathBuf, PathBuf>)> {
+    let toc = doc.toc.clone();
+
+    let mut markdown = format!("# {}\n\n", title);
+    let html_files = doc
+        .resources
+        .iter()
+        .filter(|(_, (_, mime))| mime == "application/xhtml+xml")
+        .map(|(_, (path, _))| (path.clone(), path.with_extension("md")))
+        .collect::<HashMap<PathBuf, PathBuf>>();
+    for nav in toc {
+        if let Some(md) = nav_point_to_md(&nav, 0, &html_files) {
+            markdown.push_str(&md);
+        }
+    }
+    Ok((markdown, html_files))
+}
+
+pub fn extract_chapters_and_resources<R: Read + Seek>(
+    doc: &mut EpubDoc<R>,
+    output_dir: impl AsRef<Path>,
+    html_files: &HashMap<PathBuf, PathBuf>,
+) -> anyhow::Result<()> {
+    let output_dir = output_dir.as_ref();
+    let src_dir = output_dir.join("src");
+
+    for (_, (path, _)) in doc.resources.clone().into_iter() {
+        let content = match doc.get_resource_by_path(&path) {
+            Some(content) => content,
+            None => continue,
+        };
+
+        if let Some(path) = html_files.get(&path) {
+            let target_path = src_dir.join(path);
+            if let Some(parent) = target_path.parent() {
+                fs::create_dir_all(parent)?;
+            }
+            let html = String::from_utf8(content)?;
+            let markdown = parse_html(&html);
+            fs::write(target_path, markdown)?;
+        } else {
+            let target_path = src_dir.join(&path);
+            if let Some(parent) = target_path.parent() {
+                fs::create_dir_all(parent)?;
+            }
+            fs::write(target_path, content)?;
+        }
+    }
+    Ok(())
+}
+
+pub fn write_book_toml(
+    output_dir: impl AsRef<Path>,
+    title: &str,
+    creator: Option<String>,
+) -> anyhow::Result<()> {
+    let output_dir = output_dir.as_ref();
+    let creator = match creator {
+        Some(creator) => format!("author = \"{creator}\"\n"),
+        None => "".to_string(),
+    };
+    let toml_content = format!("[book]\ntitle = \"{title}\"\n{creator}",);
+    fs::write(output_dir.join("book.toml"), toml_content)?;
+    Ok(())
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..ce38a4e
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,21 @@
+use std::path::PathBuf;
+
+use clap::Parser;
+use epub2mdbook::convert_epub_to_mdbook;
+
+#[derive(Parser)]
+struct Args {
+    /// The path to the input EPUB file
+    #[clap(short, long)]
+    input_epub_path: PathBuf,
+    /// The path to the output directory
+    #[clap(short, long)]
+    output_dir: Option<PathBuf>,
+}
+
+fn main() -> anyhow::Result<()> {
+    let args = Args::parse();
+    convert_epub_to_mdbook(args.input_epub_path, args.output_dir)?;
+    println!("Conversion completed successfully!");
+    Ok(())
+}