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// Copyright (c) 2018 The predicates-rs Project Developers. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. use std::fmt; use std::path; use reflection; use utils; use Predicate; /// Predicate that checks if a file is present /// /// This is created by the `predicate::path::exists` and `predicate::path::missing`. #[derive(Debug, Clone, Copy, PartialEq, Eq)] pub struct ExistencePredicate { exists: bool, } impl Predicate<path::Path> for ExistencePredicate { fn eval(&self, path: &path::Path) -> bool { path.exists() == self.exists } fn find_case<'a>( &'a self, expected: bool, variable: &path::Path, ) -> Option<reflection::Case<'a>> { utils::default_find_case(self, expected, variable) } } impl reflection::PredicateReflection for ExistencePredicate {} impl fmt::Display for ExistencePredicate { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "{}(var)", if self.exists { "exists" } else { "missing" }) } } /// Creates a new `Predicate` that ensures the path exists. /// /// # Examples /// /// ``` /// use std::path::Path; /// use predicates::prelude::*; /// /// let predicate_fn = predicate::path::exists(); /// assert_eq!(true, predicate_fn.eval(Path::new("Cargo.toml"))); /// ``` pub fn exists() -> ExistencePredicate { ExistencePredicate { exists: true } } /// Creates a new `Predicate` that ensures the path doesn't exist. /// /// # Examples /// /// ``` /// use std::path::Path; /// use predicates::prelude::*; /// /// let predicate_fn = predicate::path::missing(); /// assert_eq!(true, predicate_fn.eval(Path::new("non-existent-file.foo"))); /// ``` pub fn missing() -> ExistencePredicate { ExistencePredicate { exists: false } }