72 lines
2.4 KiB
Rust
72 lines
2.4 KiB
Rust
//
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// imag - the personal information management suite for the commandline
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// Copyright (C) 2015-2019 Matthias Beyer <mail@beyermatthias.de> and contributors
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; version
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// 2.1 of the License.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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//
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use chrono::NaiveDate;
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use chrono::NaiveDateTime;
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use chrono::format::ParseError;
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pub const NAIVE_DATE_STRING_FORMAT : &str = "%Y-%m-%d";
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pub fn date_to_string(ndt: NaiveDate) -> String {
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ndt.format(NAIVE_DATE_STRING_FORMAT).to_string()
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}
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pub fn date_from_string<S>(s: S) -> Result<NaiveDate, ParseError>
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where S: AsRef<str>
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{
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NaiveDate::parse_from_str(s.as_ref(), NAIVE_DATE_STRING_FORMAT)
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}
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pub const NAIVE_DATETIME_STRING_FORMAT : &str = "%Y-%m-%d %H:%M:%S";
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pub fn datetime_to_string(ndt: &NaiveDateTime) -> String {
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ndt.format(NAIVE_DATETIME_STRING_FORMAT).to_string()
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}
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pub fn datetime_from_string<S>(s: S) -> Result<NaiveDateTime, ParseError>
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where S: AsRef<str>
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{
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NaiveDateTime::parse_from_str(s.as_ref(), NAIVE_DATETIME_STRING_FORMAT)
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}
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/// Try to parse `s` with all formats from `fmts`
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///
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/// The function returns an `Option<NaiveDateTime>`, so that the user of the function can generate
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/// the appropriate error message themselves.
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///
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pub fn try_to_parse_datetime_from_string<'a, S, Formats, Format>(s: S, fmts: Formats) -> Option<NaiveDateTime>
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where S: AsRef<str>,
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Formats: Iterator<Item = Format>,
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Format: AsRef<str>
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{
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fmts.fold(None, |a, f| a.or_else(|| NaiveDateTime::parse_from_str(s.as_ref(), f.as_ref()).ok()))
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}
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#[test]
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fn test_try_to_parse_datetime_from_string() {
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let formats = vec![
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"%Y%m%dT%H%M%S",
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"%Y%m%dT%H%M%SZ"
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];
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let text = "20190730T160527Z";
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assert!(try_to_parse_datetime_from_string(text, formats.iter()).is_some())
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}
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