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use std::path::Path;
use std::fs::File;
use std::io::prelude::*;
use std::str::FromStr;
use chrono::{Datelike, NaiveDate, NaiveTime, Weekday, Duration, Timelike};
use crate::task::*;
use crate::dates::*;
// Translates a Path into a vector of tasks. Panics if the path cannot be opened or read from.
pub fn tasks_from_path(wtd_path: &WTDPath) -> Vec<Task> {
let path = Path::new(&wtd_path.path);
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 parse_file_str(&s, wtd_path.week_start),
}
}
fn parse_file_str(file_str: &str, implicit_week: Option<NaiveDate>) -> Vec<Task> {
let mut tasks = Vec::new();
let mut start_date = implicit_week;
let mut the_date = None;
for l in file_str.split('\n') {
if l.starts_with("# ") {
// '# 12/27/21', starts a new week block
start_date = parse_date_line(l);
if implicit_week.is_some() && start_date != implicit_week {
panic!("Cannot use different '# ' headers in a weekly.md or [week].md file!");
}
} else if l.starts_with("## ") {
// '## Monday/Tuesday/...', starts a new day block
// Need to compute the actual date, basically looking for the first one after
// start_date.
let dayofweek = parse_day_line(l);
let mut current = start_date.expect("Invalid or missing '# ' date");
the_date = loop {
if current.weekday() == dayofweek {
break Some(current);
}
current = current.succ();
};
} else if l.starts_with("- [ ]") || l.starts_with("- [X]") {
// '- [ ] ...', starts a new task block
let date = the_date.expect("No current date parsed yet...");
tasks.push(Task {
date: date,
start_time: None,
end_time: None,
details: "".to_string(),
raw: l.to_string(),
tags: Vec::new(),
});
tasks.last_mut().expect("").raw.push('\n');
let details = l.get(5..).expect("").trim();
handle_task_details(details, tasks.last_mut().expect("Unexpected error..."));
} else if l.starts_with(" ") {
// Extends the last task.
tasks.last_mut().expect("").raw.push_str(l);
tasks.last_mut().expect("").raw.push('\n');
handle_task_details(l, tasks.last_mut().expect("Unexpected error..."));
} else if l.trim().len() > 0 {
eprint!("Ignoring line: {}\n", l);
}
}
return tasks;
}
pub fn parse_date_line(l: &str) -> Option<NaiveDate> {
for maybe_date_str in l.split(' ') {
if let Ok(date) = NaiveDate::parse_from_str(maybe_date_str, "%m/%d/%y") {
return Some(date);
}
};
return None;
}
fn parse_day_line(l: &str) -> Weekday {
let daystr = l.get(3..).expect("Day-of-week line not long enough...");
return Weekday::from_str(daystr).expect("Misparse day-of-week str...");
}
fn parse_time(s_: &str) -> NaiveTime {
let formats = vec!["%l:%M%p", "%H:%M"];
let mut s = s_.to_string();
if !s.contains(":") {
if s.ends_with("M") {
s.insert_str(s.len() - 2, ":00");
} else {
s.push_str(":00");
}
}
for format in formats {
if let Ok(parsed) = NaiveTime::parse_from_str(&s, format) {
if !format.contains("%p") && parsed.hour() < 6 {
return parsed + Duration::hours(12);
}
return parsed;
}
}
panic!("Couldn't parse time {}", s);
}
fn parse_duration(s: &str) -> chrono::Duration {
// We try to find Mm, HhMm, Hh
if s.contains("h") && s.contains("m") {
// TODO: Decompose this case into the two below.
let hstr = s.split("h").collect::<Vec<&str>>().get(0).expect("").to_string();
let mstr = s.split("h").collect::<Vec<&str>>().get(1).expect("").split("m").collect::<Vec<&str>>().get(0).expect("Expected XhYm").to_string();
let secs = ((hstr.parse::<u64>().unwrap() * 60)
+ (mstr.parse::<u64>().unwrap())) * 60;
return chrono::Duration::from_std(std::time::Duration::new(secs, 0)).unwrap();
} else if s.contains("h") {
let hstr = s.split("h").collect::<Vec<&str>>().get(0).expect("").to_string();
let secs = hstr.parse::<u64>().unwrap() * 60 * 60;
return chrono::Duration::from_std(std::time::Duration::new(secs, 0)).unwrap();
} else if s.contains("m") {
let hstr = s.split("m").collect::<Vec<&str>>().get(0).expect("").to_string();
let secs = hstr.parse::<u64>().unwrap() * 60;
return chrono::Duration::from_std(std::time::Duration::new(secs, 0)).unwrap();
}
panic!("Couldn't parse duration {}", s);
}
fn handle_task_details(l: &str, t: &mut Task) {
for tok in l.split(' ') {
if tok.starts_with("+") {
let tag = tok.get(1..).expect("Unexpected");
t.tags.push(tag.to_string());
} else if tok.starts_with("@") {
let timestr = tok.get(1..).expect("Unexpected");
if timestr.contains("+") { // @Start+Duration
let parts: Vec<&str> = timestr.split("+").collect();
match parts[..] {
[startstr, durstr] => {
t.start_time = Some(parse_time(startstr));
t.end_time = Some(t.start_time.unwrap() + parse_duration(durstr));
},
_ => panic!("Not 2 parts to {}\n", timestr)
}
} else if timestr.contains("--") { // @Start--End
let parts: Vec<&str> = timestr.split("--").collect();
match parts[..] {
[startstr, endstr] => {
t.start_time = Some(parse_time(startstr));
t.end_time = Some(parse_time(endstr));
if t.start_time > t.end_time {
panic!("Start time {} interpreted as after end time {}",
startstr, endstr);
}
},
_ => panic!("Not 2 parts to {}\n", timestr)
}
} else {
panic!("'{}' is not of the form Start+Duration or Start--End\n", timestr);
}
} else {
if t.details.len() > 0 {
t.details.push(' ');
}
t.details.push_str(tok.trim());
}
}
}
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