From e727121bc08be004a8bf4e9c29409c4244ce1a8b Mon Sep 17 00:00:00 2001
From: arctic_hen7 <arctic_hen7@pm.me>
Date: Sat, 2 Jul 2022 16:55:25 +1000
Subject: [PATCH] feat(website): added auto-versioning to docs.rs shorthand
 links

---
 docs/manifest.json                       | 15 +++++++----
 website/src/templates/docs/generation.rs | 32 ++++++++++++++++--------
 2 files changed, 32 insertions(+), 15 deletions(-)

diff --git a/docs/manifest.json b/docs/manifest.json
index 13d9e9697e..cb7365cea7 100644
--- a/docs/manifest.json
+++ b/docs/manifest.json
@@ -1,22 +1,27 @@
 {
     "0.1.x": {
         "state": "outdated",
-        "git": "v0.1.4"
+        "git": "v0.1.4",
+        "docs_rs": "0.1"
     },
     "0.2.x": {
         "state": "outdated",
-        "git": "v0.2.3"
+        "git": "v0.2.3",
+        "docs_rs": "0.2"
     },
     "0.3.0-0.3.3": {
         "state": "outdated",
-        "git": "v0.3.3"
+        "git": "v0.3.3",
+        "docs_rs": "0.3.3"
     },
     "0.3.4": {
         "state": "stable",
-        "git": "eccf137032fbe8e6507be9e9317edc16e7576a4f"
+        "git": "eccf137032fbe8e6507be9e9317edc16e7576a4f",
+        "docs_rs": "0.3"
     },
     "0.4.x": {
         "state": "beta",
-        "git": "HEAD"
+        "git": "HEAD",
+        "docs_rs": "0.4.0-beta"
     }
 }
diff --git a/website/src/templates/docs/generation.rs b/website/src/templates/docs/generation.rs
index 1e8fd7b697..6369665a57 100644
--- a/website/src/templates/docs/generation.rs
+++ b/website/src/templates/docs/generation.rs
@@ -102,23 +102,21 @@ impl DocsVersionStatus {
 }
 /// Information about the current state of the documentation, including which versions are outdated and the like.
 pub type DocsManifest = HashMap<String, VersionManifest>;
-// pub struct DocsManifest {
-//     pub stable: String,
-//     pub outdated: Vec<String>,
-//     pub beta: Vec<String>,
-//     /// A map of versions to points in the Git version history.
-//     pub history_map: HashMap<String, String>,
-// }
 
 /// Information about a single version in the documentation manifest.
-#[derive(Serialize, Deserialize, Clone)]
+#[derive(Serialize, Deserialize, Clone, PartialEq, PartialOrd)]
 pub struct VersionManifest {
+    /// The state of this version.
     pub state: VersionState,
+    /// The location in the Git history to get examples from for this version.
     pub git: String,
+    /// The version to use on docs.rs for this version. This will be interpolated into all docs.rs links
+    /// in this version's docs.
+    pub docs_rs: String,
 }
 /// The possible states a version can be in. Note that there can only be one stable version at a time, and that the special `next`
 /// version is not accounted for here.
-#[derive(Serialize, Deserialize, Clone, PartialEq, Eq)]
+#[derive(Serialize, Deserialize, Clone, PartialEq, Eq, PartialOrd)]
 #[serde(rename_all = "snake_case")]
 pub enum VersionState {
     /// The version is outdated, and should no longer be used if possible.
@@ -344,7 +342,21 @@ pub async fn get_build_state(
 
     // Parse any links to docs.rs (of the form `[`Error`](=enum.Error@perseus)`, where `perseus` is the package name)
     // Versions are interpolated automatically
-    let docs_rs_version = "latest";
+    let docs_rs_version = if version == "next" {
+        // Unfortunately, `latest` doesn't take account of beta versions, so we use either the latest beta version or the stable version
+        let mut beta_versions = BETA_VERSIONS.values().collect::<Vec<&VersionManifest>>();
+        beta_versions.sort_by(|a, b| b.partial_cmp(a).unwrap());
+        if beta_versions.is_empty() {
+            get_stable_version(&DOCS_MANIFEST).1.docs_rs
+        } else {
+            beta_versions[0].docs_rs.to_string()
+        }
+    } else {
+        match &DOCS_MANIFEST.get(version) {
+            Some(version) => version.docs_rs.to_string(),
+            None => panic!("docs version '{}' not present in manifest", version),
+        }
+    };
     let contents = Regex::new(r#"\]\(=(?P<path>.*?)@(?P<pkg>.*?)\)"#)
         .unwrap()
         .replace_all(