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// // imag - the personal information management suite for the commandline // Copyright (C) 2015, 2016 Matthias Beyer <mail@beyermatthias.de> and contributors // // This library is free software; you can redistribute it and/or // modify it under the terms of the GNU Lesser General Public // License as published by the Free Software Foundation; version // 2.1 of the License. // // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // Lesser General Public License for more details. // // You should have received a copy of the GNU Lesser General Public // License along with this library; if not, write to the Free Software // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA // use regex::Regex; pub type Tag = String; pub type TagSlice<'a> = &'a str; /// validator which can be used by clap to validate that a string is a valid tag pub fn is_tag(s: String) -> Result<(), String> { is_tag_str(&s) } pub fn is_tag_str(s: &String) -> Result<(), String> { use filters::filter::Filter; let is_lower = |s: &String| s.chars().all(|c| c.is_lowercase()); let no_whitespace = |s: &String| s.chars().all(|c| !c.is_whitespace()); let is_alphanum = |s: &String| s.chars().all(|c| c.is_alphanumeric()); let matches_regex = |s: &String| Regex::new("^[a-zA-Z]([a-zA-Z0-9_-]*)$").unwrap().captures(s).is_some(); if is_lower.and(no_whitespace).and(is_alphanum).and(matches_regex).filter(s) { Ok(()) } else { Err(format!("The string '{}' is not a valid tag", s)) } }