file-sniffer 3.0.1

extern crate regex;

use colored::*;
use nom::IResult;
use std::process::exit;
use std::path::PathBuf;
use regex::Regex;
use error::check_regex;

pub fn get_excludes(cli_excludes: Option<&str>) -> Regex {
    match cli_excludes {
        Some(s) => { let mut x = "(".to_string(); x.push_str(s); x.push_str(r")|(\.git|\.pijul|_darcs|\.hg)$"); check_regex(&x) }
        _ => Regex::new(r"(\.git|\.pijul|_darcs|\.hg)$").unwrap(),
    }
}

pub fn get_depth(depth_from_cli: Option<&str>) -> u8 {
    if let Some(n) = depth_from_cli {
        n.parse::<u8>().expect("Please enter a positive whole number")
    }
    else {
        2
    }
}

pub fn get_num(num_from_cli: Option<&str>) -> usize {
    if let Some(num) = num_from_cli {
        num.parse::<usize>().expect("Please enter a positive whole number")
    }
    else {
        8
    }
}

pub fn get_dir(path_from_cli: Option<&str>) -> PathBuf {
    if let Some(read) = path_from_cli {
        PathBuf::from(read)
    }
    else {
        PathBuf::from(".")
    }
}

pub fn threshold(s: Option<&str>) -> Option<u64> {
    s.map(pre_threshold)
}

fn pre_threshold(t_from_cli: &str) -> u64 {
    match get_threshold(t_from_cli.as_bytes()) {
            IResult::Done(_,n) => n,
            _ => { eprintln!("{}: failed to parse threshold. defaulting to 1M", "Warning".yellow()) ; 1048576 },
            }
}

fn to_u64(nums: Vec<char>, size_tag: &[u8]) -> u64 {
    let pre: String = nums.into_iter().collect();
    let n = pre.parse::<u64>()
        .expect("Error parsing integer at cli_helpers.rs:58");
    match size_tag {
        b"G" | b"g" => n * 1073741824,
        b"M" | b"m" => n * 1048576,
        b"k" | b"K" => n * 1024,
        b"b" | b"B" => n,
        _ => exit(0x0f01),
    }
}

named!(digit_char<&[u8], char>,
    alt!(
        char!('1') |
        char!('2') |
        char!('3') |
        char!('4') |
        char!('5') |
        char!('6') |
        char!('7') |
        char!('8') |
        char!('9') |
        char!('0')
    )
);

named!(get_threshold<&[u8],u64>,
    do_parse!(
        nums:     many1!(digit_char) >>
        size_tag: alt!(tag!("M") | tag!("G") | tag!("k") | tag!("b") | tag!("B") | tag!("K") | tag!("g") | tag!("m")) >>
        (to_u64(nums, size_tag))
    )
);