dateseq.rs

extern crate chrono;
extern crate structopt;
extern crate time;

#[macro_use]
extern crate structopt_derive;

use chrono::prelude::*;
use time::Duration;
use structopt::StructOpt;
use std::io::Write;

#[derive(StructOpt, Debug)]
#[structopt(name = "dateseq", about = "Generate a list of timestamps like seq.")]
struct Opt {
    /// A flag, true if used in the command line.
    #[structopt(short = "d", long = "debug", help = "Activate debug mode")]
    debug: bool,

    #[structopt(short = "f", long = "format", help = "strftime format string", default_value = "%+")]
    format: String,

    #[structopt(short = "i", long = "increment", help = "seconds to increment by", default_value = "86400")]
    increment: i64,

    /// Needed parameter, the first on the command line.
    #[structopt(help = "Begin time")]
    begin: DateTime<Local>,

    /// Needed parameter, the first on the command line.
    #[structopt(help = "End time")]
    end: DateTime<Local>,
}

fn main() {
    let mut stderr = std::io::stderr();
    let opt = Opt::from_args();

    if opt.debug {
      writeln!(&mut stderr, "{:?}", opt).unwrap();
    }

    let mut i = opt.begin.clone();
    let dur = Duration::seconds(opt.increment);

    while i < opt.end {
      i = i + dur;
      let printme = i.format(opt.format.as_str()).to_string(); 
      println!("{}", printme);
    }
}