From 4a655ff2a38b9ebd505a04f7e6414ea04a8d8f9d Mon Sep 17 00:00:00 2001
From: Eric Huss <eric@huss.org>
Date: Mon, 21 Jul 2025 10:57:23 -0700
Subject: [PATCH] Add mdbook-core

This is intended as a shared, internal library that will be used by
other mdbook crates. The intention is that those crates will either
directly use, or reexport items from this crate.

Initially this includes MDBOOK_VERSION, which will get reexported from
the preprocessor and renderer crates.
---
 Cargo.lock                    |  7 ++++++-
 Cargo.toml                    | 10 +++++++++-
 crates/mdbook-core/Cargo.toml | 13 +++++++++++++
 crates/mdbook-core/src/lib.rs |  7 +++++++
 src/lib.rs                    |  7 +------
 5 files changed, 36 insertions(+), 8 deletions(-)
 create mode 100644 crates/mdbook-core/Cargo.toml
 create mode 100644 crates/mdbook-core/src/lib.rs

diff --git a/Cargo.lock b/Cargo.lock
index dc7e85eb..c44924f5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "addr2line"
@@ -1270,6 +1270,7 @@ dependencies = [
  "hex",
  "ignore",
  "log",
+ "mdbook-core",
  "memchr",
  "notify",
  "notify-debouncer-mini",
@@ -1293,6 +1294,10 @@ dependencies = [
  "walkdir",
 ]
 
+[[package]]
+name = "mdbook-core"
+version = "0.5.0-alpha.1"
+
 [[package]]
 name = "mdbook-remove-emphasis"
 version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
index 4e2f2251..cf8e05fd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,9 @@
 [workspace]
-members = [".", "examples/remove-emphasis/mdbook-remove-emphasis"]
+members = [
+    ".",
+    "crates/*",
+    "examples/remove-emphasis/mdbook-remove-emphasis",
+]
 
 [workspace.lints.clippy]
 all = { level = "allow", priority = -2 }
@@ -16,6 +20,9 @@ license = "MPL-2.0"
 repository = "https://github.com/rust-lang/mdBook"
 rust-version = "1.85.0" # Keep in sync with installation.md and .github/workflows/main.yml
 
+[workspace.dependencies]
+mdbook-core = { path = "crates/mdbook-core" }
+
 [package]
 name = "mdbook"
 version = "0.4.52"
@@ -43,6 +50,7 @@ env_logger = "0.11.1"
 handlebars = "6.0"
 hex = "0.4.3"
 log = "0.4.17"
+mdbook-core.workspace = true
 memchr = "2.5.0"
 opener = "0.8.1"
 pulldown-cmark = { version = "0.10.0", default-features = false, features = ["html"] } # Do not update, part of the public api.
diff --git a/crates/mdbook-core/Cargo.toml b/crates/mdbook-core/Cargo.toml
new file mode 100644
index 00000000..b8888e9c
--- /dev/null
+++ b/crates/mdbook-core/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "mdbook-core"
+version = "0.5.0-alpha.1"
+description = "The base support library for mdbook, intended for internal use only"
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+
+[lints]
+workspace = true
diff --git a/crates/mdbook-core/src/lib.rs b/crates/mdbook-core/src/lib.rs
new file mode 100644
index 00000000..152102dd
--- /dev/null
+++ b/crates/mdbook-core/src/lib.rs
@@ -0,0 +1,7 @@
+//! The base support library for mdbook, intended for internal use only.
+
+/// The current version of `mdbook`.
+///
+/// This is provided as a way for custom preprocessors and renderers to do
+/// compatibility checks.
+pub const MDBOOK_VERSION: &str = env!("CARGO_PKG_VERSION");
diff --git a/src/lib.rs b/src/lib.rs
index 93c41769..73195279 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -88,16 +88,11 @@ pub mod renderer;
 pub mod theme;
 pub mod utils;
 
-/// The current version of `mdbook`.
-///
-/// This is provided as a way for custom preprocessors and renderers to do
-/// compatibility checks.
-pub const MDBOOK_VERSION: &str = env!("CARGO_PKG_VERSION");
-
 pub use crate::book::BookItem;
 pub use crate::book::MDBook;
 pub use crate::config::Config;
 pub use crate::renderer::Renderer;
+pub use mdbook_core::MDBOOK_VERSION;
 
 /// The error types used through out this crate.
 pub mod errors {