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use chrono::*;
use crate::utils::fileutil;
use std::env;
use std::path::PathBuf;
pub fn date_from_str(date_str: &str) -> ParseResult<Date<Local>> {
if date_str == "today" || date_str == "now" {
return Ok(Local::now().date());
}
let naive_date = &NaiveDate::parse_from_str(date_str, "%Y-%m-%d")?;
Ok(Local.from_local_date(naive_date).unwrap())
}
pub fn datetime_from_str(datetime_str: &str) -> ParseResult<DateTime<Local>> {
if datetime_str == "now" {
return Ok(Local::now());
}
let naive_datetime = &NaiveDateTime::parse_from_str(datetime_str, "%Y-%m-%dT%H:%M")?;
Ok(Local.from_local_datetime(naive_datetime).unwrap())
}
pub fn week_from_str_begin(date_str: &str) -> Result<Date<Local>, String> {
let now = Local::now();
if date_str == "toweek" || date_str == "thisweek" {
return Ok(Local.isoywd(now.year(), now.iso_week().week(), Weekday::Mon));
}
if let Ok(date) = &NaiveDate::parse_from_str(&format!("{}-1", date_str), "%G-W%V-%u") {
return Ok(Local.from_local_date(date).unwrap());
}
if let Ok(date) =
&NaiveDate::parse_from_str(&format!("{}-{}-1", now.year(), date_str), "%G-W%V-%u")
{
return Ok(Local.from_local_date(date).unwrap());
}
Err("Could not parse '{}' as week".to_string())
}
pub fn find_local_timezone() -> String {
if let Ok(candidate) = env::var("TZ") {
return candidate;
}
if let Ok(candidate) = fileutil::read_file_to_string(&PathBuf::from("/etc/timezone")) {
return candidate.trim().to_owned();
}
if let Ok(candidate) = fileutil::read_file_to_string(&PathBuf::from("/etc/localtime")) {
return candidate.trim().to_owned();
}
"UTC".to_owned()
}
#[cfg(not(test))]
pub fn now() -> DateTime<Utc> {
Utc::now()
}
#[cfg(test)]
pub fn now() -> DateTime<Utc> {
use crate::testdata;
*testdata::NOW_TEST
}
pub fn week_from_str_end(date_str: &str) -> Result<Date<Local>, String> {
let now = Local::now();
if date_str == "toweek" || date_str == "thisweek" {
return Ok(Local.isoywd(now.year(), now.iso_week().week(), Weekday::Sun));
}
if let Ok(date) = &NaiveDate::parse_from_str(&format!("{}-7", date_str), "%G-W%V-%u") {
return Ok(Local.from_local_date(date).unwrap());
}
if let Ok(date) =
&NaiveDate::parse_from_str(&format!("{}-{}-7", now.year(), date_str), "%G-W%V-%u")
{
return Ok(Local.from_local_date(date).unwrap());
}
Err("Could not parse '{}' as week".to_string())
}
pub fn datetime_from_timestamp(timestamp: &str) -> Option<DateTime<Local>> {
let timestamp_i64 = timestamp.parse::<i64>().ok()?;
let naive_datetime = NaiveDateTime::from_timestamp_opt(timestamp_i64, 0)?;
let utc_time: DateTime<Utc> = DateTime::from_utc(naive_datetime, Utc);
Some(utc_time.with_timezone(&Local))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_date_from_str() {
let date = date_from_str("2018-12-10").unwrap();
assert_eq!("2018-12-10", format!("{}", date.format("%F")));
let date = date_from_str("today").unwrap();
assert_eq!(Local::now().date(), date);
let date = date_from_str("now").unwrap();
assert_eq!(Local::now().date(), date);
}
#[test]
#[should_panic]
fn test_date_from_str_negative() {
date_from_str("2018-02-30").unwrap();
}
#[test]
fn test_week_from_str_begin() {
let date = week_from_str_begin("2018-W50").unwrap();
assert_eq!("2018-12-10", format!("{}", date.format("%F")));
let date = week_from_str_begin("W50").unwrap();
assert_eq!("2019-12-09", format!("{}", date.format("%F")));
}
#[test]
fn test_week_from_str_begin_current_year() {
// TODO test must be adapted once a year. hum.
let date = week_from_str_begin("W50").unwrap();
assert_eq!("2019-12-09", format!("{}", date.format("%F")));
}
#[test]
#[should_panic]
fn test_week_from_str_begin_neg() {
week_from_str_begin("nonsense").unwrap();
}
#[test]
fn test_week_from_str_end() {
let date = week_from_str_end("W50").unwrap();
assert_eq!("2019-12-15", format!("{}", date.format("%F")));
}
#[test]
fn test_week_from_str_end_current_year() {
// TODO test must be adapted once a year. hum.
let date = week_from_str_end("W50").unwrap();
assert_eq!("2019-12-15", format!("{}", date.format("%F")));
}
#[test]
#[should_panic]
fn test_week_from_str_end_neg() {
week_from_str_end("nonsense").unwrap();
}
#[test]
fn test_datetime_from_timestamp() {
let timestamp = "1547234687";
let dt_from_ts = datetime_from_timestamp(timestamp).unwrap();
let dt = Utc.ymd(2019, 01, 11).and_hms(19, 24, 47);
assert_eq!(dt, dt_from_ts);
}
}
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