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use std::path::Path;
use std::fs::File;
use std::io::prelude::*;
use chrono::{NaiveDate, Duration};
use crate::parse::*;
pub fn prune_week_from_file(week: NaiveDate, file_str: &str) -> String {
let path = Path::new(file_str);
let display = path.display();
// Open the path in read-only mode, returns `io::Result<File>`
let mut file = match File::open(&path) {
Err(why) => panic!("Error opening {}: {}", display, why),
Ok(file) => file,
};
// Read the file contents into a string, returns `io::Result<usize>`
let mut s = String::new();
match file.read_to_string(&mut s) {
Err(why) => panic!("Couldn't read {}: {}", display, why),
Ok(_) => return prune_week_from_str(week, &s),
}
}
fn prune_week_from_str(week: NaiveDate, file_str: &str) -> String {
let mut new_contents = "\n".to_string();
let mut ghost = false;
let ghost_start = week - Duration::days(6);
let ghost_end = week + Duration::days(6);
for l in file_str.split('\n') {
if l.starts_with("# ") {
// '# 12/27/21', starts a new week block
let start_date = parse_date_line(l).expect("Couldn't parse '# ' header.");
ghost = ghost_start <= start_date && start_date <= ghost_end;
if ghost && start_date != week {
panic!("generate currently assumes `# ` headers always start on Mondays.");
}
}
if !ghost {
new_contents.push_str(l);
new_contents.push('\n');
}
}
// Remove leading & trailing newlines.
new_contents.remove(0);
new_contents.pop();
return new_contents;
}
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