From cda56ef862e5292417f5897900e11588cb1e1004 Mon Sep 17 00:00:00 2001
From: Jack Grigg <jack@z.cash>
Date: Sun, 23 Aug 2020 10:54:32 +0100
Subject: [PATCH] zcash_proofs: Add feature flags to docs.rs documentation

---
 zcash_proofs/Cargo.toml    | 3 +++
 zcash_proofs/src/lib.rs    | 7 +++++++
 zcash_proofs/src/prover.rs | 3 +++
 3 files changed, 13 insertions(+)

diff --git a/zcash_proofs/Cargo.toml b/zcash_proofs/Cargo.toml
index 8a917e2f8..74567b460 100644
--- a/zcash_proofs/Cargo.toml
+++ b/zcash_proofs/Cargo.toml
@@ -11,6 +11,9 @@ readme = "README.md"
 license = "MIT OR Apache-2.0"
 edition = "2018"
 
+[package.metadata.docs.rs]
+all-features = true
+
 [dependencies]
 bellman = { version = "0.6", path = "../bellman", default-features = false, features = ["groth16"] }
 blake2b_simd = "0.5"
diff --git a/zcash_proofs/src/lib.rs b/zcash_proofs/src/lib.rs
index ecbb34c0b..6d0476c57 100644
--- a/zcash_proofs/src/lib.rs
+++ b/zcash_proofs/src/lib.rs
@@ -3,6 +3,7 @@
 //! `zcash_proofs` contains the zk-SNARK circuits used by Zcash, and the APIs for creating
 //! and verifying proofs.
 
+#![cfg_attr(docsrs, feature(doc_cfg))]
 // Catch documentation errors caused by code changes.
 #![deny(intra_doc_link_resolution_failure)]
 
@@ -24,6 +25,10 @@ pub mod sapling;
 pub mod sprout;
 
 #[cfg(any(feature = "local-prover", feature = "bundled-prover"))]
+#[cfg_attr(
+    docsrs,
+    doc(cfg(any(feature = "local-prover", feature = "bundled-prover")))
+)]
 pub mod prover;
 
 // Circuit names
@@ -42,6 +47,7 @@ const DOWNLOAD_URL: &str = "https://download.z.cash/downloads";
 
 /// Returns the default folder that the Zcash proving parameters are located in.
 #[cfg(feature = "directories")]
+#[cfg_attr(docsrs, doc(cfg(feature = "directories")))]
 pub fn default_params_folder() -> Option<PathBuf> {
     BaseDirs::new().map(|base_dirs| {
         if cfg!(any(windows, target_os = "macos")) {
@@ -56,6 +62,7 @@ pub fn default_params_folder() -> Option<PathBuf> {
 ///
 /// This mirrors the behaviour of the `fetch-params.sh` script from `zcashd`.
 #[cfg(feature = "download-params")]
+#[cfg_attr(docsrs, doc(cfg(feature = "download-params")))]
 pub fn download_parameters() -> Result<(), minreq::Error> {
     // Ensure that the default Zcash parameters location exists.
     let params_dir = default_params_folder().ok_or(io::Error::new(
diff --git a/zcash_proofs/src/prover.rs b/zcash_proofs/src/prover.rs
index 5373bc3f9..f84b22279 100644
--- a/zcash_proofs/src/prover.rs
+++ b/zcash_proofs/src/prover.rs
@@ -49,6 +49,7 @@ impl LocalTxProver {
     /// This function will panic if the paths do not point to valid parameter files with
     /// the expected hashes.
     #[cfg(feature = "local-prover")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "local-prover")))]
     pub fn new(spend_path: &Path, output_path: &Path) -> Self {
         let (spend_params, spend_vk, output_params, _, _) =
             load_parameters(spend_path, output_path, None);
@@ -81,6 +82,7 @@ impl LocalTxProver {
     /// This function will panic if the parameters in the default local location do not
     /// have the expected hashes.
     #[cfg(feature = "local-prover")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "local-prover")))]
     pub fn with_default_location() -> Option<Self> {
         let params_dir = default_params_folder()?;
         let (spend_path, output_path) = if params_dir.exists() {
@@ -103,6 +105,7 @@ impl LocalTxProver {
     /// This requires the `bundled-prover` feature, which will increase the binary size by
     /// around 50 MiB.
     #[cfg(feature = "bundled-prover")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "bundled-prover")))]
     pub fn bundled() -> Self {
         let (spend_buf, output_buf) = wagyu_zcash_parameters::load_sapling_parameters();
         let (spend_params, spend_vk, output_params, _, _) =