add profiling feature

Cargo.toml

@@ -44,6 +44,8 @@ nightly = []
 random = ["rand"]
 # Option: compile to web assembly
 wasm = ["wasm-bindgen"]
+# Option: enable features that assist in profiling (e.g. inline(never))
+profiling = []
 
 [dev-dependencies]
 tempfile = "3"

src/lib.rs

@@ -80,6 +80,7 @@ grass input.scss
     clippy::redundant_pub_crate,
 )]
 #![cfg_attr(feature = "nightly", feature(track_caller))]
+#![cfg_attr(feature = "profiling", inline(never))]
 
 use std::iter::Iterator;
 

src/main.rs

@@ -21,6 +21,7 @@ arg_enum! {
     }
 }
 
+#[cfg_attr(feature = "profiling", inline(never))]
 fn main() -> std::io::Result<()> {
     let matches = App::new("grass")
         .version(env!("CARGO_PKG_VERSION"))

src/stylesheet.rs

@@ -71,7 +71,8 @@ impl StyleSheet {
     ///     Ok(())
     /// }
     /// ```
-    #[inline]
+    #[cfg_attr(feature = "profiling", inline(never))]
+    #[cfg_attr(not(feature = "profiling"), inline)]
     #[cfg(not(feature = "wasm"))]
     pub fn new(input: String) -> SassResult<String> {
         let mut map = CodeMap::new();
@@ -102,7 +103,8 @@ impl StyleSheet {
     ///     Ok(())
     /// }
     /// ```
-    #[inline]
+    #[cfg_attr(feature = "profiling", inline(never))]
+    #[cfg_attr(not(feature = "profiling"), inline)]
     #[cfg(not(feature = "wasm"))]
     pub fn from_path(p: &str) -> SassResult<String> {
         let mut map = CodeMap::new();