From 1e9e4ad93e4080527a8818241db9914b9268b7e5 Mon Sep 17 00:00:00 2001
From: Austin Seipp <aseipp@pobox.com>
Date: Fri, 23 Feb 2024 17:26:10 -0600
Subject: [PATCH] docs: initialize new `jj-docs` crate

Signed-off-by: Austin Seipp <aseipp@pobox.com>
---
 Cargo.lock      | 42 ++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml      | 11 ++++++++++-
 docs/Cargo.toml | 19 +++++++++++++++++++
 docs/lib.rs     | 40 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 111 insertions(+), 1 deletion(-)
 create mode 100644 docs/Cargo.toml
 create mode 100644 docs/lib.rs

diff --git a/Cargo.lock b/Cargo.lock
index 3da0d8ca45..39d4e952f7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1718,6 +1718,13 @@ dependencies = [
  "unicode-width",
 ]
 
+[[package]]
+name = "jj-docs"
+version = "0.16.0"
+dependencies = [
+ "rust-embed",
+]
+
 [[package]]
 name = "jj-lib"
 version = "0.16.0"
@@ -2561,6 +2568,41 @@ dependencies = [
  "windows-sys 0.48.0",
 ]
 
+[[package]]
+name = "rust-embed"
+version = "8.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fb78f46d0066053d16d4ca7b898e9343bc3530f71c61d5ad84cd404ada068745"
+dependencies = [
+ "rust-embed-impl",
+ "rust-embed-utils",
+ "walkdir",
+]
+
+[[package]]
+name = "rust-embed-impl"
+version = "8.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b91ac2a3c6c0520a3fb3dd89321177c3c692937c4eb21893378219da10c44fc8"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "rust-embed-utils",
+ "syn",
+ "walkdir",
+]
+
+[[package]]
+name = "rust-embed-utils"
+version = "8.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86f69089032567ffff4eada41c573fc43ff466c7db7c5688b2e7969584345581"
+dependencies = [
+ "globset",
+ "sha2",
+ "walkdir",
+]
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.23"
diff --git a/Cargo.toml b/Cargo.toml
index 51040d8212..5fc5da80f1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,14 @@ cargo-features = []
 
 [workspace]
 resolver = "2"
-members = ["cli", "lib", "lib/gen-protos", "lib/proc-macros", "lib/testutils"]
+members = [
+    "cli",
+    "lib",
+    "docs",
+    "lib/gen-protos",
+    "lib/proc-macros",
+    "lib/testutils",
+]
 
 [workspace.package]
 version = "0.16.0"
@@ -80,6 +87,7 @@ ref-cast = "1.0.22"
 regex = "1.10.3"
 rpassword = "7.3.1"
 rustix = { version = "0.38.32", features = ["fs"] }
+rust-embed = { version = "8.3.0", features = ["include-exclude"] }
 scm-record = "0.2.0"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0.115"
@@ -116,6 +124,7 @@ zstd = "0.12.4"
 # put all inter-workspace libraries, i.e. those that use 'path = ...' here in
 # their own (alphabetically sorted) block
 
+jj-docs = { path = "docs", version = "0.16.0" }
 jj-lib = { path = "lib", version = "0.16.0" }
 jj-lib-proc-macros = { path = "lib/proc-macros", version = "0.16.0" }
 testutils = { path = "lib/testutils" }
diff --git a/docs/Cargo.toml b/docs/Cargo.toml
new file mode 100644
index 0000000000..3feb38b063
--- /dev/null
+++ b/docs/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "jj-docs"
+description = "Documentation for Jujutsu - an experimental version control system"
+autotests = false
+
+version = { workspace = true }
+edition = { workspace = true }
+rust-version = { workspace = true }
+license = { workspace = true }
+homepage = { workspace = true }
+repository = { workspace = true }
+documentation = { workspace = true }
+readme = { workspace = true }
+
+[lib]
+path = "lib.rs"
+
+[dependencies]
+rust-embed = { workspace = true }
diff --git a/docs/lib.rs b/docs/lib.rs
new file mode 100644
index 0000000000..4539af91ab
--- /dev/null
+++ b/docs/lib.rs
@@ -0,0 +1,40 @@
+// Copyright 2024 The Jujutsu Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use std::borrow::Cow;
+
+#[derive(rust_embed::RustEmbed)]
+#[folder = "."]
+#[include = "*.md"]
+struct DocAssetsMd;
+
+pub struct DocAssets;
+
+/// Documentation assets, allowing you to look up and iterate all the documents
+/// available.
+impl DocAssets {
+    // This is a simple wrapper around the `DocAssetsMd`
+    // struct that handles trimming off Markdown `.md` extensions, so that users
+    // can refer to documentation items without needing to know the file extension.
+
+    /// Iterator. Returns all the documentation items available.
+    pub fn iter() -> impl Iterator<Item = String> {
+        DocAssetsMd::iter().map(|name| name.trim_end_matches(".md").to_owned())
+    }
+
+    pub fn get(name: &str) -> Option<Cow<'static, [u8]>> {
+        // re-attach the `.md` extension before lookup
+        DocAssetsMd::get(&format!("{}.md", name)).map(|data| data.data)
+    }
+}