added more pre-allocations

Signed-off-by: Dominik Wilkowski <[email protected]>

src/csv.rs

@@ -35,9 +35,9 @@ impl<R: BufRead> CsvParser<R> {
 	}
 
 	fn parse_csv_line(&self) -> Vec<String> {
-		let mut cell = String::new();
 		let mut in_quotes = false;
 		let mut chars = self.buffer.chars().peekable();
+		let mut cell = String::new();
 		let mut record = Vec::new();
 
 		while let Some(c) = chars.next() {
@@ -69,6 +69,8 @@ impl<R: BufRead> CsvParser<R> {
 /// Convert a two dimensional collection of Strings into a CSV compatible String
 pub fn export(records: &[Vec<String>], output: &mut String) {
 	output.clear();
+	output.reserve(records.iter().map(|line| line.len() * 32).sum());
+
 	for line in records {
 		let mut first_cell = true;
 		for cell in line {

src/main.rs

@@ -65,7 +65,7 @@ fn main() {
 			);
 		},
 	};
-	let reader = BufReader::new(input_file);
+	let reader = BufReader::with_capacity(64 * 1024, input_file);
 
 	let output_file = match File::create(&settings.output) {
 		Ok(file) => file,
@@ -77,7 +77,7 @@ fn main() {
 			);
 		},
 	};
-	let mut writer = BufWriter::new(output_file);
+	let mut writer = BufWriter::with_capacity(256 * 1024, output_file);
 
 	let mut is_heading = true;
 	let mut output = String::new();

src/process.rs

@@ -9,8 +9,9 @@ use crate::{
 pub fn run(input_line: &[String], output_config: &OutputConfig) -> Vec<Vec<String>> {
 	let mut new_lines = Vec::new();
 	let mut skip_line = false;
+
 	for items in &output_config.lines {
-		let mut line: Vec<String> = Vec::new();
+		let mut line: Vec<String> = Vec::with_capacity(items.len());
 		for item in items {
 			match item {
 				Item::Cell(i, filters) => match input_line.get(*i) {