Edit README; Improve bench script; Optimize

README.md

@@ -93,6 +93,8 @@ cargo install dust-lang
 dust
 ```
 
+## Benchmarks
+
 ## Development Status
 
 Currently, Dust is being prepared for version 1.0. Until then, there may be breaking changes to the language and CLI.

scripts/bench.fish

@@ -11,7 +11,7 @@ hyperfine \
       --shell none \
       --parameter-list data_path examples/assets/seaCreatures.json \
       --warmup 3 \
-      "dust -c 'length(json:parse(fs:read_file(\"{data_path}\")))'" \
+      "target/release/dust -c 'length(json:parse(fs:read_file(\"{data_path}\")))'" \
       "jq 'length' {data_path}" \
       "node --eval \"require('node:fs').readFile('{data_path}', (err, data)=>{console.log(JSON.parse(data).length)})\"" \
       "nu -c 'open {data_path} | length'"
@@ -20,7 +20,7 @@ hyperfine \
       --shell none \
       --parameter-list data_path examples/assets/jq_data.json \
       --warmup 3 \
-      "dust -c 'length(json:parse(fs:read_file(\"{data_path}\")))'" \
+      "target/release/dust -c 'length(json:parse(fs:read_file(\"{data_path}\")))'" \
       "jq 'length' {data_path}" \
       "node --eval \"require('node:fs').readFile('{data_path}', (err, data)=>{console.log(JSON.parse(data).length)})\"" \
       "nu -c 'open {data_path} | length'"
@@ -29,7 +29,7 @@ hyperfine \
       --shell none \
       --parameter-list data_path dielectron.json \
       --warmup 3 \
-      "dust -c 'length(json:parse(fs:read_file(\"{data_path}\")))'" \
+      "target/release/dust -c 'length(json:parse(fs:read_file(\"{data_path}\")))'" \
       "jq 'length' {data_path}" \
       "node --eval \"require('node:fs').readFile('{data_path}', (err, data)=>{console.log(JSON.parse(data).length)})\"" \
       "nu -c 'open {data_path} | length'"

src/built_in_functions/fs.rs

@@ -1,4 +1,4 @@
-use std::fs::read_to_string;
+use std::{fs::File, io::Read};
 
 use enum_iterator::{all, Sequence};
 use serde::{Deserialize, Serialize};
@@ -46,7 +46,11 @@ impl Callable for Fs {
                 RuntimeError::expect_argument_amount(self.name(), 1, arguments.len())?;
 
                 let path = arguments.first().unwrap().as_string()?;
-                let file_content = read_to_string(path.as_str())?;
+                let mut file = File::open(path)?;
+                let file_size = file.metadata()?.len() as usize;
+                let mut file_content = String::with_capacity(file_size);
+
+                file.read_to_string(&mut file_content)?;
 
                 Ok(Value::string(file_content))
             }