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@paomian
Last active November 26, 2015 10:12
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use std::io::BufReader;
use std::io::BufRead;
use std::fs::File;
use std::path::Path;
use std::error::Error;
use std::env;
use std::collections::BTreeMap;
fn get_data(s:&str,separator:char,n:usize) -> Option<usize> {
let mut g = 0;
for (i,c) in s.chars().enumerate() {
if c == separator {
g += 1;
if g == n {
return Some(i);
}
}
}
return None;
}
fn main() {
let s_path = if let Some(arg) = env::args().nth(1) {
println!("The first argument is {}", arg);
arg
} else {
println!("Please input a file name");
return;
};
let s_id = if let Some(arg) = env::args().nth(2) {
println!("The secend argument is {}", arg);
arg
} else {
println!("Please input a file name");
return;
};
let path = Path::new(&s_path);
let p_display = path.display();
let mut store_m:BTreeMap<String,usize> = BTreeMap::new();
let f = match File::open(&path) {
Ok(v) => v,
Err(e) => panic!("couldn't open {}: {}", p_display,
Error::description(&e)),
};
let file = BufReader::new(&f);
for line in file.lines() {
let _ = line.map(|l| {
if let Some(_) = l.find(&s_id) {
get_data(&l,' ',7).map(|x|{
let tmp = &l[x+1..];
get_data(tmp,' ',3).map(|y| {
get_data(tmp,' ',4).map(|z| {
let app_id = &tmp[y+1..z-1];
*store_m.entry(app_id.to_string()).or_insert(0) += 1;
});
});
});
}
});
}
let mut v:Vec<(&str,usize)> = Vec::new();
for (key, value) in store_m.iter() {
v.push((key,*value));
}
v.sort_by(|&(_,a),&(_,b)| a.cmp(&b));
for v in v.iter() {
//println!("{}:{}",key,value);
println!("{}:{}",v.0,v.1);
}
}
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