Initial data commit

Task/FASTA-format/Rust/fasta-format.rust

@@ -0,0 +1,63 @@
+use std::env;
+use std::io::{BufReader, Lines};
+use std::io::prelude::*;
+use std::fs::File;
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let f = File::open(&args[1]).unwrap();
+    for line in FastaIter::new(f) {
+        println!("{}", line);
+    }
+}
+
+struct FastaIter<T> {
+    buffer_lines: Lines<BufReader<T>>,
+    current_name: Option<String>,
+    current_sequence: String
+}
+
+impl<T: Read> FastaIter<T> {
+    fn new(file: T) -> FastaIter<T> {
+        FastaIter { buffer_lines: BufReader::new(file).lines(),
+                    current_name: None,
+                    current_sequence: String::new() }
+    }
+}
+
+impl<T: Read> Iterator for FastaIter<T> {
+    type Item = String;
+
+    fn next(&mut self) -> Option<String> {
+        while let Some(l) = self.buffer_lines.next() {
+            let line = l.unwrap();
+            if line.starts_with(">") {
+                if self.current_name.is_some() {
+                    let mut res = String::new();
+                    res.push_str(self.current_name.as_ref().unwrap());
+                    res.push_str(": ");
+                    res.push_str(&self.current_sequence);
+                    self.current_name = Some(String::from(&line[1..]));
+                    self.current_sequence.clear();
+                    return Some(res);
+                } else {
+                    self.current_name = Some(String::from(&line[1..]));
+                    self.current_sequence.clear();
+                }
+                continue;
+            }
+            self.current_sequence.push_str(line.trim());
+        }
+        if self.current_name.is_some() {
+            let mut res = String::new();
+            res.push_str(self.current_name.as_ref().unwrap());
+            res.push_str(": ");
+            res.push_str(&self.current_sequence);
+            self.current_name = None;
+            self.current_sequence.clear();
+            self.current_sequence.shrink_to_fit();
+            return Some(res);
+        }
+        None
+    }
+}