From 46292c7cecb0bd957aee48f72b5c1e931ce47b79 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Sun, 31 May 2020 15:02:12 +0200
Subject: Move assists documentation into the manual

---
 docs/user/generated_assists.adoc | 973 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 973 insertions(+)
 create mode 100644 docs/user/generated_assists.adoc

(limited to 'docs/user/generated_assists.adoc')

diff --git a/docs/user/generated_assists.adoc b/docs/user/generated_assists.adoc
new file mode 100644
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--- /dev/null
+++ b/docs/user/generated_assists.adoc
@@ -0,0 +1,973 @@
+[discrete]
+=== `add_custom_impl`
+
+Adds impl block for derived trait.
+
+.Before
+```rust
+#[derive(Deb┃ug, Display)]
+struct S;
+```
+
+.After
+```rust
+#[derive(Display)]
+struct S;
+
+impl Debug for S {
+    $0
+}
+```
+
+
+[discrete]
+=== `add_derive`
+
+Adds a new `#[derive()]` clause to a struct or enum.
+
+.Before
+```rust
+struct Point {
+    x: u32,
+    y: u32,┃
+}
+```
+
+.After
+```rust
+#[derive($0)]
+struct Point {
+    x: u32,
+    y: u32,
+}
+```
+
+
+[discrete]
+=== `add_explicit_type`
+
+Specify type for a let binding.
+
+.Before
+```rust
+fn main() {
+    let x┃ = 92;
+}
+```
+
+.After
+```rust
+fn main() {
+    let x: i32 = 92;
+}
+```
+
+
+[discrete]
+=== `add_from_impl_for_enum`
+
+Adds a From impl for an enum variant with one tuple field.
+
+.Before
+```rust
+enum A { ┃One(u32) }
+```
+
+.After
+```rust
+enum A { One(u32) }
+
+impl From<u32> for A {
+    fn from(v: u32) -> Self {
+        A::One(v)
+    }
+}
+```
+
+
+[discrete]
+=== `add_function`
+
+Adds a stub function with a signature matching the function under the cursor.
+
+.Before
+```rust
+struct Baz;
+fn baz() -> Baz { Baz }
+fn foo() {
+    bar┃("", baz());
+}
+
+```
+
+.After
+```rust
+struct Baz;
+fn baz() -> Baz { Baz }
+fn foo() {
+    bar("", baz());
+}
+
+fn bar(arg: &str, baz: Baz) {
+    ${0:todo!()}
+}
+
+```
+
+
+[discrete]
+=== `add_hash`
+
+Adds a hash to a raw string literal.
+
+.Before
+```rust
+fn main() {
+    r#"Hello,┃ World!"#;
+}
+```
+
+.After
+```rust
+fn main() {
+    r##"Hello, World!"##;
+}
+```
+
+
+[discrete]
+=== `add_impl`
+
+Adds a new inherent impl for a type.
+
+.Before
+```rust
+struct Ctx<T: Clone> {
+    data: T,┃
+}
+```
+
+.After
+```rust
+struct Ctx<T: Clone> {
+    data: T,
+}
+
+impl<T: Clone> Ctx<T> {
+    $0
+}
+```
+
+
+[discrete]
+=== `add_impl_default_members`
+
+Adds scaffold for overriding default impl members.
+
+.Before
+```rust
+trait Trait {
+    Type X;
+    fn foo(&self);
+    fn bar(&self) {}
+}
+
+impl Trait for () {
+    Type X = ();
+    fn foo(&self) {}┃
+
+}
+```
+
+.After
+```rust
+trait Trait {
+    Type X;
+    fn foo(&self);
+    fn bar(&self) {}
+}
+
+impl Trait for () {
+    Type X = ();
+    fn foo(&self) {}
+    $0fn bar(&self) {}
+
+}
+```
+
+
+[discrete]
+=== `add_impl_missing_members`
+
+Adds scaffold for required impl members.
+
+.Before
+```rust
+trait Trait<T> {
+    Type X;
+    fn foo(&self) -> T;
+    fn bar(&self) {}
+}
+
+impl Trait<u32> for () {┃
+
+}
+```
+
+.After
+```rust
+trait Trait<T> {
+    Type X;
+    fn foo(&self) -> T;
+    fn bar(&self) {}
+}
+
+impl Trait<u32> for () {
+    fn foo(&self) -> u32 {
+        ${0:todo!()}
+    }
+
+}
+```
+
+
+[discrete]
+=== `add_new`
+
+Adds a new inherent impl for a type.
+
+.Before
+```rust
+struct Ctx<T: Clone> {
+     data: T,┃
+}
+```
+
+.After
+```rust
+struct Ctx<T: Clone> {
+     data: T,
+}
+
+impl<T: Clone> Ctx<T> {
+    fn $0new(data: T) -> Self { Self { data } }
+}
+
+```
+
+
+[discrete]
+=== `add_turbo_fish`
+
+Adds `::<_>` to a call of a generic method or function.
+
+.Before
+```rust
+fn make<T>() -> T { todo!() }
+fn main() {
+    let x = make┃();
+}
+```
+
+.After
+```rust
+fn make<T>() -> T { todo!() }
+fn main() {
+    let x = make::<${0:_}>();
+}
+```
+
+
+[discrete]
+=== `apply_demorgan`
+
+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 `&&`, with both operands being a negation of some kind.
+This means something of the form `!x` or `x != y`.
+
+.Before
+```rust
+fn main() {
+    if x != 4 ||┃ !y {}
+}
+```
+
+.After
+```rust
+fn main() {
+    if !(x == 4 && y) {}
+}
+```
+
+
+[discrete]
+=== `auto_import`
+
+If the name is unresolved, provides all possible imports for it.
+
+.Before
+```rust
+fn main() {
+    let map = HashMap┃::new();
+}
+```
+
+.After
+```rust
+use std::collections::HashMap;
+
+fn main() {
+    let map = HashMap::new();
+}
+```
+
+
+[discrete]
+=== `change_lifetime_anon_to_named`
+
+Change an anonymous lifetime to a named lifetime.
+
+.Before
+```rust
+impl Cursor<'_┃> {
+    fn node(self) -> &SyntaxNode {
+        match self {
+            Cursor::Replace(node) | Cursor::Before(node) => node,
+        }
+    }
+}
+```
+
+.After
+```rust
+impl<'a> Cursor<'a> {
+    fn node(self) -> &SyntaxNode {
+        match self {
+            Cursor::Replace(node) | Cursor::Before(node) => node,
+        }
+    }
+}
+```
+
+
+[discrete]
+=== `change_return_type_to_result`
+
+Change the function's return type to Result.
+
+.Before
+```rust
+fn foo() -> i32┃ { 42i32 }
+```
+
+.After
+```rust
+fn foo() -> Result<i32, ${0:_}> { Ok(42i32) }
+```
+
+
+[discrete]
+=== `change_visibility`
+
+Adds or changes existing visibility specifier.
+
+.Before
+```rust
+┃fn frobnicate() {}
+```
+
+.After
+```rust
+pub(crate) fn frobnicate() {}
+```
+
+
+[discrete]
+=== `convert_to_guarded_return`
+
+Replace a large conditional with a guarded return.
+
+.Before
+```rust
+fn main() {
+    ┃if cond {
+        foo();
+        bar();
+    }
+}
+```
+
+.After
+```rust
+fn main() {
+    if !cond {
+        return;
+    }
+    foo();
+    bar();
+}
+```
+
+
+[discrete]
+=== `fill_match_arms`
+
+Adds missing clauses to a `match` expression.
+
+.Before
+```rust
+enum Action { Move { distance: u32 }, Stop }
+
+fn handle(action: Action) {
+    match action {
+        ┃
+    }
+}
+```
+
+.After
+```rust
+enum Action { Move { distance: u32 }, Stop }
+
+fn handle(action: Action) {
+    match action {
+        $0Action::Move { distance } => {}
+        Action::Stop => {}
+    }
+}
+```
+
+
+[discrete]
+=== `fix_visibility`
+
+Makes inaccessible item public.
+
+.Before
+```rust
+mod m {
+    fn frobnicate() {}
+}
+fn main() {
+    m::frobnicate┃() {}
+}
+```
+
+.After
+```rust
+mod m {
+    $0pub(crate) fn frobnicate() {}
+}
+fn main() {
+    m::frobnicate() {}
+}
+```
+
+
+[discrete]
+=== `flip_binexpr`
+
+Flips operands of a binary expression.
+
+.Before
+```rust
+fn main() {
+    let _ = 90 +┃ 2;
+}
+```
+
+.After
+```rust
+fn main() {
+    let _ = 2 + 90;
+}
+```
+
+
+[discrete]
+=== `flip_comma`
+
+Flips two comma-separated items.
+
+.Before
+```rust
+fn main() {
+    ((1, 2),┃ (3, 4));
+}
+```
+
+.After
+```rust
+fn main() {
+    ((3, 4), (1, 2));
+}
+```
+
+
+[discrete]
+=== `flip_trait_bound`
+
+Flips two trait bounds.
+
+.Before
+```rust
+fn foo<T: Clone +┃ Copy>() { }
+```
+
+.After
+```rust
+fn foo<T: Copy + Clone>() { }
+```
+
+
+[discrete]
+=== `inline_local_variable`
+
+Inlines local variable.
+
+.Before
+```rust
+fn main() {
+    let x┃ = 1 + 2;
+    x * 4;
+}
+```
+
+.After
+```rust
+fn main() {
+    (1 + 2) * 4;
+}
+```
+
+
+[discrete]
+=== `introduce_variable`
+
+Extracts subexpression into a variable.
+
+.Before
+```rust
+fn main() {
+    ┃(1 + 2)┃ * 4;
+}
+```
+
+.After
+```rust
+fn main() {
+    let $0var_name = (1 + 2);
+    var_name * 4;
+}
+```
+
+
+[discrete]
+=== `invert_if`
+
+Apply invert_if
+This transforms if expressions of the form `if !x {A} else {B}` into `if x {B} else {A}`
+This also works with `!=`. This assist can only be applied with the cursor
+on `if`.
+
+.Before
+```rust
+fn main() {
+    if┃ !y { A } else { B }
+}
+```
+
+.After
+```rust
+fn main() {
+    if y { B } else { A }
+}
+```
+
+
+[discrete]
+=== `make_raw_string`
+
+Adds `r#` to a plain string literal.
+
+.Before
+```rust
+fn main() {
+    "Hello,┃ World!";
+}
+```
+
+.After
+```rust
+fn main() {
+    r#"Hello, World!"#;
+}
+```
+
+
+[discrete]
+=== `make_usual_string`
+
+Turns a raw string into a plain string.
+
+.Before
+```rust
+fn main() {
+    r#"Hello,┃ "World!""#;
+}
+```
+
+.After
+```rust
+fn main() {
+    "Hello, \"World!\"";
+}
+```
+
+
+[discrete]
+=== `merge_imports`
+
+Merges two imports with a common prefix.
+
+.Before
+```rust
+use std::┃fmt::Formatter;
+use std::io;
+```
+
+.After
+```rust
+use std::{fmt::Formatter, io};
+```
+
+
+[discrete]
+=== `merge_match_arms`
+
+Merges identical match arms.
+
+.Before
+```rust
+enum Action { Move { distance: u32 }, Stop }
+
+fn handle(action: Action) {
+    match action {
+        ┃Action::Move(..) => foo(),
+        Action::Stop => foo(),
+    }
+}
+```
+
+.After
+```rust
+enum Action { Move { distance: u32 }, Stop }
+
+fn handle(action: Action) {
+    match action {
+        Action::Move(..) | Action::Stop => foo(),
+    }
+}
+```
+
+
+[discrete]
+=== `move_arm_cond_to_match_guard`
+
+Moves if expression from match arm body into a guard.
+
+.Before
+```rust
+enum Action { Move { distance: u32 }, Stop }
+
+fn handle(action: Action) {
+    match action {
+        Action::Move { distance } => ┃if distance > 10 { foo() },
+        _ => (),
+    }
+}
+```
+
+.After
+```rust
+enum Action { Move { distance: u32 }, Stop }
+
+fn handle(action: Action) {
+    match action {
+        Action::Move { distance } if distance > 10 => foo(),
+        _ => (),
+    }
+}
+```
+
+
+[discrete]
+=== `move_bounds_to_where_clause`
+
+Moves inline type bounds to a where clause.
+
+.Before
+```rust
+fn apply<T, U, ┃F: FnOnce(T) -> U>(f: F, x: T) -> U {
+    f(x)
+}
+```
+
+.After
+```rust
+fn apply<T, U, F>(f: F, x: T) -> U where F: FnOnce(T) -> U {
+    f(x)
+}
+```
+
+
+[discrete]
+=== `move_guard_to_arm_body`
+
+Moves match guard into match arm body.
+
+.Before
+```rust
+enum Action { Move { distance: u32 }, Stop }
+
+fn handle(action: Action) {
+    match action {
+        Action::Move { distance } ┃if distance > 10 => foo(),
+        _ => (),
+    }
+}
+```
+
+.After
+```rust
+enum Action { Move { distance: u32 }, Stop }
+
+fn handle(action: Action) {
+    match action {
+        Action::Move { distance } => if distance > 10 { foo() },
+        _ => (),
+    }
+}
+```
+
+
+[discrete]
+=== `remove_dbg`
+
+Removes `dbg!()` macro call.
+
+.Before
+```rust
+fn main() {
+    ┃dbg!(92);
+}
+```
+
+.After
+```rust
+fn main() {
+    92;
+}
+```
+
+
+[discrete]
+=== `remove_hash`
+
+Removes a hash from a raw string literal.
+
+.Before
+```rust
+fn main() {
+    r#"Hello,┃ World!"#;
+}
+```
+
+.After
+```rust
+fn main() {
+    r"Hello, World!";
+}
+```
+
+
+[discrete]
+=== `remove_mut`
+
+Removes the `mut` keyword.
+
+.Before
+```rust
+impl Walrus {
+    fn feed(&mut┃ self, amount: u32) {}
+}
+```
+
+.After
+```rust
+impl Walrus {
+    fn feed(&self, amount: u32) {}
+}
+```
+
+
+[discrete]
+=== `reorder_fields`
+
+Reorder the fields of record literals and record patterns in the same order as in
+the definition.
+
+.Before
+```rust
+struct Foo {foo: i32, bar: i32};
+const test: Foo = ┃Foo {bar: 0, foo: 1}
+```
+
+.After
+```rust
+struct Foo {foo: i32, bar: i32};
+const test: Foo = Foo {foo: 1, bar: 0}
+```
+
+
+[discrete]
+=== `replace_if_let_with_match`
+
+Replaces `if let` with an else branch with a `match` expression.
+
+.Before
+```rust
+enum Action { Move { distance: u32 }, Stop }
+
+fn handle(action: Action) {
+    ┃if let Action::Move { distance } = action {
+        foo(distance)
+    } else {
+        bar()
+    }
+}
+```
+
+.After
+```rust
+enum Action { Move { distance: u32 }, Stop }
+
+fn handle(action: Action) {
+    match action {
+        Action::Move { distance } => foo(distance),
+        _ => bar(),
+    }
+}
+```
+
+
+[discrete]
+=== `replace_let_with_if_let`
+
+Replaces `let` with an `if-let`.
+
+.Before
+```rust
+
+fn main(action: Action) {
+    ┃let x = compute();
+}
+
+fn compute() -> Option<i32> { None }
+```
+
+.After
+```rust
+
+fn main(action: Action) {
+    if let Some(x) = compute() {
+    }
+}
+
+fn compute() -> Option<i32> { None }
+```
+
+
+[discrete]
+=== `replace_qualified_name_with_use`
+
+Adds a use statement for a given fully-qualified name.
+
+.Before
+```rust
+fn process(map: std::collections::┃HashMap<String, String>) {}
+```
+
+.After
+```rust
+use std::collections::HashMap;
+
+fn process(map: HashMap<String, String>) {}
+```
+
+
+[discrete]
+=== `replace_unwrap_with_match`
+
+Replaces `unwrap` a `match` expression. Works for Result and Option.
+
+.Before
+```rust
+enum Result<T, E> { Ok(T), Err(E) }
+fn main() {
+    let x: Result<i32, i32> = Result::Ok(92);
+    let y = x.┃unwrap();
+}
+```
+
+.After
+```rust
+enum Result<T, E> { Ok(T), Err(E) }
+fn main() {
+    let x: Result<i32, i32> = Result::Ok(92);
+    let y = match x {
+        Ok(a) => a,
+        $0_ => unreachable!(),
+    };
+}
+```
+
+
+[discrete]
+=== `split_import`
+
+Wraps the tail of import into braces.
+
+.Before
+```rust
+use std::┃collections::HashMap;
+```
+
+.After
+```rust
+use std::{collections::HashMap};
+```
+
+
+[discrete]
+=== `unwrap_block`
+
+This assist removes if...else, for, while and loop control statements to just keep the body.
+
+.Before
+```rust
+fn foo() {
+    if true {┃
+        println!("foo");
+    }
+}
+```
+
+.After
+```rust
+fn foo() {
+    println!("foo");
+}
+```
-- 
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