From 192a5cd11d413fdbaeb8d2e5106d82ae3b4a05c1 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Wed, 20 Mar 2019 12:17:12 +0300
Subject: better user docs

---
 docs/user/features.md | 168 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 docs/user/features.md

(limited to 'docs/user/features.md')

diff --git a/docs/user/features.md b/docs/user/features.md
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+This documents is an index of features that rust-analyzer language server provides.
+
+### Go to symbol in workspace <kbd>ctrl+t</kbd>
+
+It mostly works on top of the built-in LSP functionality, however `#` and `*`
+symbols can be used to narrow down the search. Specifically,
+
+- `#Foo` searches for `Foo` type in the current workspace
+- `#foo#` searches for `foo` function in the current workspace
+- `#Foo*` searches for `Foo` type among dependencies, excluding `stdlib`
+- `#foo#*` searches for `foo` function among dependencies.
+
+That is, `#` switches from "types" to all symbols, `*` switches from the current
+workspace to dependencies.
+
+### Commands <kbd>ctrl+shift+p</kbd>
+
+#### Show Rust Syntax Tree
+
+Shows the parse tree of the current file. It exists mostly for debugging
+rust-analyzer itself.
+
+#### Extend Selection
+
+Extends the current selection to the encompassing syntactic construct
+(expression, statement, item, module, etc). It works with multiple cursors. Do
+bind this command to a key, its super-useful! Expected to be upstreamed to LSP soonish:
+https://github.com/Microsoft/language-server-protocol/issues/613
+
+#### Matching Brace
+
+If the cursor is on any brace (`<>(){}[]`) which is a part of a brace-pair,
+moves cursor to the matching brace. It uses the actual parser to determine
+braces, so it won't confuse generics with comparisons.
+
+#### Parent Module
+
+Navigates to the parent module of the current module.
+
+#### Join Lines
+
+Join selected lines into one, smartly fixing up whitespace and trailing commas.
+
+#### Run
+
+Shows popup suggesting to run a test/benchmark/binary **at the current cursor
+location**. Super useful for repeatedly running just a single test. Do bind this
+to a shortcut!
+
+
+### On Typing Assists
+
+Some features trigger on typing certain characters:
+
+- typing `let =` tries to smartly add `;` if `=` is followed by an existing expression.
+- Enter inside comments automatically inserts `///`
+- typing `.` in a chain method call auto-indents
+
+
+
+
+
+### Code Actions (Assists)
+
+These are triggered in a particular context via light bulb. We use custom code on
+the VS Code side to be able to position cursor.
+
+
+- Flip `,`
+
+```rust
+// before:
+fn foo(x: usize,<|> dim: (usize, usize))
+// after:
+fn foo(dim: (usize, usize), x: usize)
+```
+
+- Add `#[derive]`
+
+```rust
+// before:
+struct Foo {
+    <|>x: i32
+}
+// after:
+#[derive(<|>)]
+struct Foo {
+    x: i32
+}
+```
+
+- Add `impl`
+
+```rust
+// before:
+struct Foo<'a, T: Debug> {
+    <|>t: T
+}
+// after:
+struct Foo<'a, T: Debug> {
+    t: T
+}
+
+impl<'a, T: Debug> Foo<'a, T> {
+    <|>
+}
+```
+
+- Change visibility
+
+```rust
+// before:
+fn<|> foo() {}
+
+// after
+pub(crate) fn foo() {}
+```
+
+- Introduce variable:
+
+```rust
+// before:
+fn foo() {
+    foo(<|>1 + 1<|>);
+}
+
+// after:
+fn foo() {
+    let var_name = 1 + 1;
+    foo(var_name);
+}
+```
+
+- Replace if-let with match:
+
+```rust
+// before:
+impl VariantData {
+    pub fn is_struct(&self) -> bool {
+        if <|>let VariantData::Struct(..) = *self {
+            true
+        } else {
+            false
+        }
+    }
+}
+
+// after:
+impl VariantData {
+    pub fn is_struct(&self) -> bool {
+        <|>match *self {
+            VariantData::Struct(..) => true,
+            _ => false,
+        }
+    }
+}
+```
+
+- Split import
+
+```rust
+// before:
+use algo:<|>:visitor::{Visitor, visit};
+//after:
+use algo::{<|>visitor::{Visitor, visit}};
+```
+
+
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