first commit

src/main.rs

@@ -0,0 +1,60 @@
+use std::io::prelude::*;
+use std::io;
+use std::fs::File;
+
+use num::*;
+use clap::Parser;
+
+#[derive(Parser)]
+struct Cli {
+    /// The path to the file to read
+    #[clap(parse(from_os_str))]
+    path: std::path::PathBuf,
+}
+
+struct Timestamp{
+    file_offset: u64,
+    timestamp:   BigInt
+}
+
+fn main() -> std::io::Result<()> {
+    let args = Cli::parse();
+
+    let file       = File::open(&args.path)?;
+    let mut reader = io::BufReader::new(file);
+
+    let mut buffer             = String::new();
+    let mut timestamp_offsets  = Vec::new();
+    let mut timestamps         = Vec::new();
+
+    while {
+        let bytes_read = reader.read_line(&mut buffer).unwrap();
+        bytes_read > 0
+    } {
+        if &buffer[0..1] == "#" {
+            let pos = reader.stream_position().unwrap();
+            timestamp_offsets.push(pos);
+
+            let timestamp = {
+                let len = buffer.len();
+                let str_val = &buffer[1..(len - 1)].as_bytes();
+                BigInt::parse_bytes(str_val, 10).unwrap()
+            };
+            timestamps.push(timestamp);
+        }
+        buffer.clear()
+    }
+
+    let index = 4;
+    let timestamp_offset = timestamp_offsets.get(index).unwrap();
+    let timestamp        = timestamps.get(index).unwrap();
+    dbg!((timestamp_offset, timestamp));
+
+    // seek to where we found the first timestamp and read
+    // out the next line
+    reader.seek(io::SeekFrom::Start(*timestamp_offset));
+    reader.read_line(&mut buffer);
+    dbg!(buffer);
+
+    Ok(())
+}