Merge #1796

1796: Support completion for macros r=matklad a=uHOOCCOOHu

This is based on #1795 , and fixes #1727 

Also prettify hover text of macros.

Some screenshorts below:

Completion in item place.
<img width="416" alt="Screenshot_20190910_134056" src="https://user-images.githubusercontent.com/14816024/64587159-fa72da00-d3d0-11e9-86bb-c98f169ec08d.png">

After pressing `tab`.
<img width="313" alt="Screenshot_20190910_134111" src="https://user-images.githubusercontent.com/14816024/64587160-fa72da00-d3d0-11e9-9464-21e3f6957bd7.png">

Complete macros from `std`.
<img width="588" alt="Screenshot_20190910_134147" src="https://user-images.githubusercontent.com/14816024/64587161-fb0b7080-d3d0-11e9-866e-5161f0d1b546.png">

Hover text.
<img width="521" alt="Screenshot_20190910_134242" src="https://user-images.githubusercontent.com/14816024/64587162-fb0b7080-d3d0-11e9-8f09-ad17e3f6702a.png">



Co-authored-by: uHOOCCOOHu <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/crates/ra_ide_api/src/completion.rs b/crates/ra_ide_api/src/completion.rs
index a4f080adc..0ad414831 100644
--- a/crates/ra_ide_api/src/completion.rs
+++ b/crates/ra_ide_api/src/completion.rs
@@ -12,6 +12,7 @@ mod complete_snippet;
 mod complete_path;
 mod complete_scope;
 mod complete_postfix;
+mod complete_macro_in_item_position;
 
 use ra_db::SourceDatabase;
 
@@ -69,5 +70,6 @@ pub(crate) fn completions(db: &db::RootDatabase, position: FilePosition) -> Opti
     complete_record_pattern::complete_record_pattern(&mut acc, &ctx);
     complete_pattern::complete_pattern(&mut acc, &ctx);
     complete_postfix::complete_postfix(&mut acc, &ctx);
+    complete_macro_in_item_position::complete_macro_in_item_position(&mut acc, &ctx);
     Some(acc)
 }