Auto merge of #52257 - steveklabnik:refactor-rustdoc, r=QuietMisdreavus

Refactor rustdoc

This is based on #52194 and so shouldn't be merged until it gets merged.

Now that plugin functionality has been removed, let's kill PluginManager. Additionally, rustdoc now follows the standard cargo layout instead of dumping everything at the top level.

r? @rust-lang/rustdoc

src/librustdoc/lib.rs

@@ -90,7 +90,6 @@ pub mod html {
 }
 pub mod markdown;
 pub mod passes;
-pub mod plugins;
 pub mod visit_ast;
 pub mod visit_lib;
 pub mod test;
@@ -750,25 +749,22 @@ where R: 'static + Send,
             eprintln!("WARNING: --plugin-path no longer functions; see CVE-2018-1000622");
         }
 
-        // Load all plugins/passes into a PluginManager
-        let mut pm = plugins::PluginManager::new();
+        info!("Executing passes");
+
         for pass in &passes {
-            let plugin = match passes::PASSES.iter()
-                                             .position(|&(p, ..)| {
-                                                 p == *pass
-                                             }) {
-                Some(i) => passes::PASSES[i].1,
+            // determine if we know about this pass
+            let pass = match passes::PASSES.iter().find(|(p, ..)| p == pass) {
+                Some(pass) => pass.1,
                 None => {
                     error!("unknown pass {}, skipping", *pass);
+
                     continue
                 },
             };
-            pm.add_plugin(plugin);
-        }
 
-        // Run everything!
-        info!("Executing passes/plugins");
-        let krate = pm.run_plugins(krate);
+            // run it
+            krate = pass(krate);
+        }
 
         tx.send(f(Output { krate: krate, renderinfo: renderinfo, passes: passes })).unwrap();
     }));

src/librustdoc/passes/collapse_docs.rs

@@ -9,7 +9,6 @@
 // except according to those terms.
 
 use clean::{self, DocFragment, Item};
-use plugins;
 use fold;
 use fold::DocFolder;
 use std::mem::replace;
@@ -31,7 +30,7 @@ impl DocFragment {
     }
 }
 
-pub fn collapse_docs(krate: clean::Crate) -> plugins::PluginResult {
+pub fn collapse_docs(krate: clean::Crate) -> clean::Crate {
     Collapser.fold_crate(krate)
 }
 

src/librustdoc/passes/mod.rs

@@ -16,7 +16,6 @@ use std::mem;
 use clean::{self, GetDefId, Item};
 use fold;
 use fold::FoldItem::Strip;
-use plugins;
 
 mod collapse_docs;
 pub use self::collapse_docs::collapse_docs;
@@ -37,7 +36,7 @@ mod propagate_doc_cfg;
 pub use self::propagate_doc_cfg::propagate_doc_cfg;
 
 type Pass = (&'static str,                                      // name
-             fn(clean::Crate) -> plugins::PluginResult,         // fn
+             fn(clean::Crate) -> clean::Crate,                  // fn
              &'static str);                                     // description
 
 pub const PASSES: &'static [Pass] = &[

src/librustdoc/passes/propagate_doc_cfg.rs

@@ -13,9 +13,8 @@ use std::sync::Arc;
 use clean::{Crate, Item};
 use clean::cfg::Cfg;
 use fold::DocFolder;
-use plugins::PluginResult;
 
-pub fn propagate_doc_cfg(cr: Crate) -> PluginResult {
+pub fn propagate_doc_cfg(cr: Crate) -> Crate {
     CfgPropagator { parent_cfg: None }.fold_crate(cr)
 }
 

src/librustdoc/passes/strip_hidden.rs

@@ -13,14 +13,13 @@ use std::mem;
 
 use clean::{self, AttributesExt, NestedAttributesExt};
 use clean::Item;
-use plugins;
 use fold;
 use fold::DocFolder;
 use fold::FoldItem::Strip;
 use passes::ImplStripper;
 
 /// Strip items marked `#[doc(hidden)]`
-pub fn strip_hidden(krate: clean::Crate) -> plugins::PluginResult {
+pub fn strip_hidden(krate: clean::Crate) -> clean::Crate {
     let mut retained = DefIdSet();
 
     // strip all #[doc(hidden)] items

src/librustdoc/passes/strip_priv_imports.rs

@@ -10,9 +10,8 @@
 
 use clean;
 use fold::DocFolder;
-use plugins;
 use passes::ImportStripper;
 
-pub fn strip_priv_imports(krate: clean::Crate)  -> plugins::PluginResult {
+pub fn strip_priv_imports(krate: clean::Crate)  -> clean::Crate {
     ImportStripper.fold_crate(krate)
 }

src/librustdoc/passes/strip_private.rs

@@ -11,13 +11,12 @@
 use rustc::util::nodemap::DefIdSet;
 
 use clean;
-use plugins;
 use fold::DocFolder;
 use passes::{ImplStripper, ImportStripper, Stripper};
 
 /// Strip private items from the point of view of a crate or externally from a
 /// crate, specified by the `xcrate` flag.
-pub fn strip_private(mut krate: clean::Crate) -> plugins::PluginResult {
+pub fn strip_private(mut krate: clean::Crate) -> clean::Crate {
     // This stripper collects all *retained* nodes.
     let mut retained = DefIdSet();
     let access_levels = krate.access_levels.clone();

src/librustdoc/passes/unindent_comments.rs

@@ -13,10 +13,9 @@ use std::string::String;
 use std::usize;
 
 use clean::{self, DocFragment, Item};
-use plugins;
 use fold::{self, DocFolder};
 
-pub fn unindent_comments(krate: clean::Crate) -> plugins::PluginResult {
+pub fn unindent_comments(krate: clean::Crate) -> clean::Crate {
     CommentCleaner.fold_crate(krate)
 }