manual: Convert to mdbook

Split manual.adoc into markdown files, one for each chapter.

For the parts of the manual that are generated from source code doc
comments, update the comments to use markdown syntax and update the
code generators to write to `generated.md` files.

For the weekly release, stop copying the .adoc files to the
`rust-analyzer/rust-analyzer.github.io` at release time. Instead,
we'll sync the manual hourly from this repository.

See rust-analyzer/rust-analyzer.github.io#226
for the sync. This PR should be merged first, and that PR needs to be
merged before the next weekly release.

This change is based on #15795, but rebased and updated. I've also
manually checked each page for markdown syntax issues and fixed any I
encountered.

Co-authored-by: Lukas Wirth <lukastw97@gmail.com>
Co-authored-by: Josh Rotenberg <joshrotenberg@gmail.com>

Author: 3 people

src/tools/rust-analyzer/.gitignore

@@ -6,10 +6,11 @@ target/
 *.log
 *.iml
 .vscode/settings.json
-generated_assists.adoc
-generated_features.adoc
-generated_diagnostic.adoc
 .DS_Store
 /out/
 /dump.lsif
 .envrc
+docs/book/book
+docs/book/src/assists_generated.md
+docs/book/src/diagnostics_generated.md
+docs/book/src/features_generated.md

src/tools/rust-analyzer/crates/ide-assists/src/handlers/apply_demorgan.rs

@@ -15,7 +15,7 @@ use crate::{utils::invert_boolean_expression, AssistContext, AssistId, AssistKin
 
 // Assist: apply_demorgan
 //
-// Apply https://en.wikipedia.org/wiki/De_Morgan%27s_laws[De Morgan's law].
+// Apply [De Morgan's law](https://en.wikipedia.org/wiki/De_Morgan%27s_laws).
 // This transforms expressions of the form `!l || !r` into `!(l && r)`.
 // This also works with `&&`. This assist can only be applied with the cursor
 // on either `||` or `&&`.
@@ -131,7 +131,7 @@ pub(crate) fn apply_demorgan(acc: &mut Assists, ctx: &AssistContext<'_>) -> Opti
 
 // Assist: apply_demorgan_iterator
 //
-// Apply https://en.wikipedia.org/wiki/De_Morgan%27s_laws[De Morgan's law] to
+// Apply [De Morgan's law](https://en.wikipedia.org/wiki/De_Morgan%27s_laws) to
 // `Iterator::all` and `Iterator::any`.
 //
 // This transforms expressions of the form `!iter.any(|x| predicate(x))` into

src/tools/rust-analyzer/crates/ide-assists/src/handlers/auto_import.rs

@@ -38,7 +38,7 @@ use crate::{AssistContext, AssistId, AssistKind, Assists, GroupLabel};
 // use super::AssistContext;
 // ```
 //
-// .Import Granularity
+// #### Import Granularity
 //
 // It is possible to configure how use-trees are merged with the `imports.granularity.group` setting.
 // It has the following configurations:
@@ -54,7 +54,7 @@ use crate::{AssistContext, AssistId, AssistKind, Assists, GroupLabel};
 //
 // In `VS Code` the configuration for this is `rust-analyzer.imports.granularity.group`.
 //
-// .Import Prefix
+// #### Import Prefix
 //
 // The style of imports in the same crate is configurable through the `imports.prefix` setting.
 // It has the following configurations:
@@ -68,7 +68,7 @@ use crate::{AssistContext, AssistId, AssistKind, Assists, GroupLabel};
 //
 // In `VS Code` the configuration for this is `rust-analyzer.imports.prefix`.
 //
-// image::https://user-images.githubusercontent.com/48062697/113020673-b85be580-917a-11eb-9022-59585f35d4f8.gif[]
+// ![Auto Import](https://user-images.githubusercontent.com/48062697/113020673-b85be580-917a-11eb-9022-59585f35d4f8.gif)
 
 // Assist: auto_import
 //

src/tools/rust-analyzer/crates/ide-assists/src/tests/generated.rs

@@ -1,4 +1,4 @@
-//! Generated by `cargo codegen assists-doc-tests`, do not edit by hand.
+//! Generated by `cargo xtask codegen assists-doc-tests`, do not edit by hand.
 
 use super::check_doc_test;
 

src/tools/rust-analyzer/crates/ide-completion/src/completions/flyimport.rs

@@ -83,27 +83,27 @@ use crate::{
 // NOTE: currently, if an assoc item comes from a trait that's not currently imported, and it also has an unresolved and/or partially-qualified path,
 // no imports will be proposed.
 //
-// .Fuzzy search details
+// #### Fuzzy search details
 //
 // To avoid an excessive amount of the results returned, completion input is checked for inclusion in the names only
 // (i.e. in `HashMap` in the `std::collections::HashMap` path).
 // For the same reasons, avoids searching for any path imports for inputs with their length less than 2 symbols
 // (but shows all associated items for any input length).
 //
-// .Import configuration
+// #### Import configuration
 //
 // It is possible to configure how use-trees are merged with the `imports.granularity.group` setting.
 // Mimics the corresponding behavior of the `Auto Import` feature.
 //
-// .LSP and performance implications
+// #### LSP and performance implications
 //
 // The feature is enabled only if the LSP client supports LSP protocol version 3.16+ and reports the `additionalTextEdits`
 // (case-sensitive) resolve client capability in its client capabilities.
 // This way the server is able to defer the costly computations, doing them for a selected completion item only.
 // For clients with no such support, all edits have to be calculated on the completion request, including the fuzzy search completion ones,
 // which might be slow ergo the feature is automatically disabled.
 //
-// .Feature toggle
+// #### Feature toggle
 //
 // The feature can be forcefully turned off in the settings with the `rust-analyzer.completion.autoimport.enable` flag.
 // Note that having this flag set to `true` does not guarantee that the feature is enabled: your client needs to have the corresponding

src/tools/rust-analyzer/crates/ide-completion/src/completions/postfix/format_like.rs

@@ -14,7 +14,7 @@
 // ** `logw` -> `log::warn!(...)`
 // ** `loge` -> `log::error!(...)`
 //
-// image::https://user-images.githubusercontent.com/48062697/113020656-b560f500-917a-11eb-87de-02991f61beb8.gif[]
+// ![Format String Completion](https://user-images.githubusercontent.com/48062697/113020656-b560f500-917a-11eb-87de-02991f61beb8.gif)
 
 use ide_db::{
     syntax_helpers::format_string_exprs::{parse_format_exprs, with_placeholders, Arg},

src/tools/rust-analyzer/crates/ide-completion/src/lib.rs

@@ -110,11 +110,13 @@ impl CompletionFieldsToResolve {
 //
 // There also snippet completions:
 //
-// .Expressions
+// #### Expressions
+//
 // - `pd` -> `eprintln!(" = {:?}", );`
 // - `ppd` -> `eprintln!(" = {:#?}", );`
 //
-// .Items
+// #### Items
+//
 // - `tfn` -> `#[test] fn feature(){}`
 // - `tmod` ->
 // ```rust
@@ -131,7 +133,7 @@ impl CompletionFieldsToResolve {
 // Those are the additional completion options with automatic `use` import and options from all project importable items,
 // fuzzy matched against the completion input.
 //
-// image::https://user-images.githubusercontent.com/48062697/113020667-b72ab880-917a-11eb-8778-716cf26a0eb3.gif[]
+// ![Magic Completions](https://user-images.githubusercontent.com/48062697/113020667-b72ab880-917a-11eb-8778-716cf26a0eb3.gif)
 
 /// Main entry point for completion. We run completion as a two-phase process.
 ///

src/tools/rust-analyzer/crates/ide-completion/src/snippet.rs

@@ -8,8 +8,7 @@
 //
 // A custom snippet can be defined by adding it to the `rust-analyzer.completion.snippets.custom` object respectively.
 //
-// [source,json]
-// ----
+// ```json
 // {
 //   "rust-analyzer.completion.snippets.custom": {
 //     "thread spawn": {
@@ -25,7 +24,7 @@
 //     }
 //   }
 // }
-// ----
+// ```
 //
 // In the example above:
 //
@@ -39,6 +38,7 @@
 // * `description` is an optional description of the snippet, if unset the snippet name will be used.
 //
 // * `requires` is an optional list of item paths that have to be resolvable in the current crate where the completion is rendered.
+
 // On failure of resolution the snippet won't be applicable, otherwise the snippet will insert an import for the items on insertion if
 // the items aren't yet in scope.
 //
@@ -55,8 +55,8 @@
 //
 // For the VSCode editor, rust-analyzer also ships with a small set of defaults which can be removed
 // by overwriting the settings object mentioned above, the defaults are:
-// [source,json]
-// ----
+//
+// ```json
 // {
 //     "Arc::new": {
 //         "postfix": "arc",
@@ -98,7 +98,7 @@
 //         "scope": "expr"
 //     }
 // }
-// ----
+// ````
 
 use hir::{ModPath, Name, Symbol};
 use ide_db::imports::import_assets::LocatedImport;

src/tools/rust-analyzer/crates/ide-db/src/apply_change.rs

@@ -44,12 +44,11 @@ impl RootDatabase {
     //
     // Clears rust-analyzer's internal database and prints memory usage statistics.
     //
-    // |===
-    // | Editor  | Action Name
-    //
+    // | Editor  | Action Name |
+    // |---------|-------------|
     // | VS Code | **rust-analyzer: Memory Usage (Clears Database)**
-    // |===
-    // image::https://user-images.githubusercontent.com/48062697/113065592-08559f00-91b1-11eb-8c96-64b88068ec02.gif[]
+
+    // ![Memory Usage](https://user-images.githubusercontent.com/48062697/113065592-08559f00-91b1-11eb-8c96-64b88068ec02.gif)
     pub fn per_query_memory_usage(&mut self) -> Vec<(String, Bytes, usize)> {
         let mut acc: Vec<(String, Bytes, usize)> = vec![];
 

src/tools/rust-analyzer/crates/ide-db/src/symbol_index.rs

@@ -193,11 +193,9 @@ impl<DB> std::ops::Deref for Snap<DB> {
 // `rust-analyzer.workspace.symbol.search.kind` settings. Symbols prefixed
 // with `__` are hidden from the search results unless configured otherwise.
 //
-// |===
-// | Editor  | Shortcut
-//
-// | VS Code | kbd:[Ctrl+T]
-// |===
+// | Editor  | Shortcut |
+// |---------|-----------|
+// | VS Code | <kbd>Ctrl+T</kbd>
 pub fn world_symbols(db: &RootDatabase, query: Query) -> Vec<FileSymbol> {
     let _p = tracing::info_span!("world_symbols", query = ?query.query).entered();