Separate metadata parsing into a library

.github/workflows/ci.yml

@@ -58,10 +58,10 @@ jobs:
           psql "${CRATESFYI_DATABASE_URL}"
 
       - name: Build
-        run: cargo build --locked
+        run: cargo build --workspace --locked
 
       - name: Test
-        run: cargo test --locked
+        run: cargo test --workspace --locked
 
       - name: Clean up the database
         run: docker-compose down --volumes
@@ -134,7 +134,7 @@ jobs:
       - uses: actions-rs/cargo@v1
         with:
           command: clippy
-          args: --locked -- -D warnings
+          args: --workspace --locked -- -D warnings
 
       - name: Clean unused artifacts
         uses: actions-rs/cargo@v1

Cargo.toml

@@ -8,6 +8,8 @@ repository = "https://github.com/rust-lang/docs.rs"
 build = "build.rs"
 edition = "2018"
 
+[workspace]
+
 [dependencies]
 log = "0.4"
 regex = "1"
@@ -24,6 +26,7 @@ r2d2_postgres = "0.16"
 # url@2 for other usecases
 url = { version = "2.1.1", features = ["serde"] }
 badge = { path = "src/web/badge" }
+docsrs-metadata = { path = "metadata" }
 backtrace = "0.3"
 failure = { version = "0.1.3", features = ["backtrace"] }
 comrak = { version = "0.8", default-features = false }

build.rs

@@ -8,12 +8,6 @@ use std::{
 };
 
 fn main() {
-    // Set the host target
-    println!(
-        "cargo:rustc-env=CRATESFYI_HOST_TARGET={}",
-        env::var("TARGET").unwrap(),
-    );
-
     // Don't rerun anytime a single change is made
     println!("cargo:rerun-if-changed=templates/style/vendored.scss");
     println!("cargo:rerun-if-changed=templates/style/base.scss");

dockerfiles/Dockerfile

@@ -31,6 +31,7 @@ WORKDIR /build
 COPY benches benches
 COPY Cargo.lock Cargo.toml ./
 COPY src/web/badge src/web/badge/
+COPY metadata metadata/
 RUN echo "fn main() {}" > src/main.rs && \
     echo "fn main() {}" > build.rs
 

metadata/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "docsrs-metadata"
+version = "0.1.0"
+authors = ["Joshua Nelson <[email protected]>"]
+edition = "2018"
+license = "MIT"
+repository = "https://github.com/rust-lang/docs.rs"
+description = "Document crates the same way docs.rs would"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+path = "lib.rs"
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+toml = { version = "0.5", default-features = false }
+thiserror = "1"

metadata/build.rs

@@ -0,0 +1,10 @@
+fn main() {
+    // Set the host target
+    println!(
+        "cargo:rustc-env=DOCS_RS_METADATA_HOST_TARGET={}",
+        std::env::var("TARGET").unwrap(),
+    );
+    // This only needs to be rerun if the TARGET changed, in which case cargo reruns it anyway.
+    // See https://doc.rust-lang.org/cargo/reference/build-scripts.html#cargorerun-if-env-changedname
+    println!("cargo:rerun-if-changed=build.rs");
+}