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extern crate chrono;
extern crate docopt;
extern crate serde;
use std::process::exit;
use chrono::NaiveDate;
use docopt::Docopt;
use serde::Deserialize;
use std::collections::LinkedList;
mod partition;
use partition::partition_days;
const USAGE: &'static str = "
Usage: frotate [-k|-d] [-b <base>] <day>...
frotate --help
Options:
-k --keep Print days to keep
-d --delete Print days to delete
-b --base <base> Base of the exponent [default: 1.1]
-h --help Show this help text
";
#[derive(Deserialize)]
struct Args {
flag_keep: bool,
flag_delete: bool,
flag_base: f32,
arg_day: Vec<NaiveDate>,
}
fn exponent(b: f32, n: u32) -> i64 {
let i: i32 = n as i32 - 1;
b.powi(i).ceil() as i64
}
fn main() {
let args: Args = Docopt::new(USAGE)
.and_then(|d| d.deserialize())
.unwrap_or_else(|e| e.exit());
let parts: LinkedList<LinkedList<NaiveDate>> =
partition_days(&|n| exponent(args.flag_base, n), &args.arg_day)
.into_iter()
.map(|l| l.into_iter().rev().collect())
.collect();
if args.flag_keep {
for days in parts.iter() {
match days.front() {
Some(d) => print!("{:?} ", d),
None => {}
}
}
println!();
} else if args.flag_delete {
for days in parts.iter() {
for d in days.iter().skip(1) {
print!("{:?} ", d);
}
}
println!();
} else {
for days in parts.iter() {
for d in days.iter() {
eprint!("{:?} ", d);
}
eprintln!();
}
exit(1);
}
}
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