Merge #4282

4282: More name hints omitting heuristics r=matklad a=SomeoneToIgnore

Omit parameter name hints for cases like the first two parameters from the screenshot:

<img width="394" alt="Screenshot 2020-05-03 at 15 06 34" src="https://user-images.githubusercontent.com/2690773/80914717-165b2f80-8d56-11ea-8675-040972f70d98.png">


Co-authored-by: Kirill Bulatov <[email protected]>

1 files changed, 14 insertions, 0 deletions

diff --git a/crates/stdx/src/lib.rs b/crates/stdx/src/lib.rs
index 01cdf452c..0f34ce70e 100644
--- a/crates/stdx/src/lib.rs
+++ b/crates/stdx/src/lib.rs
@@ -102,3 +102,17 @@ pub fn timeit(label: &'static str) -> impl Drop {
 
     Guard { label, start: Instant::now() }
 }
+
+pub fn to_lower_snake_case(s: &str) -> String {
+    let mut buf = String::with_capacity(s.len());
+    let mut prev = false;
+    for c in s.chars() {
+        if c.is_ascii_uppercase() && prev {
+            buf.push('_')
+        }
+        prev = true;
+
+        buf.push(c.to_ascii_lowercase());
+    }
+    buf
+}