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#![deny(missing_docs)] //! Simpath - or Simple Path is a small library for creating, manipulating and using Unix style //! `Path`s. //! //! A `Path` is an environment variable (a String) with one or more directories specified. //! They are usually used to find a file that resides in one of the directories. //! On most platform the default separator character is `:` but on Windows it is `;` //! //! If you wish to separate entries with a different separator, it can be modified via API. //! #[cfg(feature = "urls")] extern crate curl; #[cfg(feature = "urls")] extern crate url; use std::env; use std::fmt; use std::fs; use std::io::{Error, ErrorKind}; use std::path::PathBuf; #[cfg(feature = "urls")] use curl::easy::{Handler, WriteError}; #[cfg(feature = "urls")] use url::Url; use std::collections::HashSet; #[cfg(feature = "urls")] struct Collector(Vec<u8>); #[cfg(feature = "urls")] impl Handler for Collector { fn write(&mut self, data: &[u8]) -> std::result::Result<usize, WriteError> { self.0.extend_from_slice(data); Ok(data.len()) } } // Character used to separate directories in a Path Environment variable on windows is ";" #[cfg(target_family = "windows")] const DEFAULT_SEPARATOR_CHAR: char = ';'; // Character used to separate directories in a Path Environment variable on linux/mac/unix is ":" #[cfg(not(target_family = "windows"))] const DEFAULT_SEPARATOR_CHAR: char = ':'; /// `Simpath` is the struct returned when you create a new on using a named environment variable /// which you then use to interact with the `Simpath` #[derive(Clone, Debug)] pub struct Simpath { separator: char, name: String, directories: HashSet<PathBuf>, #[cfg(feature = "urls")] urls: HashSet<Url>, } /// `FileType` can be used to find an entry in a path of a specific type (`Directory`, `File`, `URL`) /// or of `Any` type #[derive(Debug, PartialEq)] pub enum FileType { /// An entry in the `Simpath` of type `File` File, /// An entry in the `Simpath` of type `Directory` Directory, /// An entry in the `Simpath` of type `Url` Resource, /// An entry in the `Simpath` of `Any` types Any, } /// `FoundType` indicates what type of entry was found #[derive(Debug, PartialEq)] pub enum FoundType { /// An entry in the `Simpath` of type `File` File(PathBuf), /// An entry in the `Simpath` of type `Directory` Directory(PathBuf), #[cfg(feature = "urls")] /// An entry in the `Simpath` of type `Url` Resource(Url), } /// When validating a `Simpath` there can be the following types of `PathError`s returned pub enum PathError { /// The `Path` entry does not exist on the file system DoesNotExist(String), /// The `Path` entry cannot be reads CannotRead(String), } impl Simpath { /// Create a new simpath, providing the name of the environment variable to initialize the /// search path with. If an environment variable of that name exists and it will be parsed /// as a ':' separated list of paths to search. Only paths detected as directories will /// be used, not files. /// /// If an environment variable of that name is *not* found, a new simpath will be created anyway /// and it can have directories added to it programatically and used in the normal fashion to /// search for files /// /// ``` /// extern crate simpath; /// use simpath::Simpath; /// /// fn main() { /// let search_path = Simpath::new("PATH"); /// let ls_file = search_path.find("ls"); /// match ls_file { /// Ok(found) => println!("'ls' was found at '{:?}'", found), /// Err(e) => println!("{}", e) /// } /// } /// ``` /// pub fn new(var_name: &str) -> Self { let mut search_path = Simpath { separator: DEFAULT_SEPARATOR_CHAR, name: var_name.to_string(), directories: HashSet::<PathBuf>::new(), #[cfg(feature = "urls")] urls: HashSet::<Url>::new(), }; search_path.add_from_env_var(var_name); search_path } /// Create a new simpath, providing the name of the environment variable to initialize the /// search path with and the separator character for this search path to be used from here on. /// If an environment variable of that name exists and it will be parsed as a list of paths to /// search. Only paths detected as directories will be used, not files. /// /// If an environment variable of that name is *not* found, a new simpath will be created anyway /// and it can have directories added to it programatically and used in the normal fashion to /// search for files. /// /// In all cases, the separator char for this search path will be set to `separator` from here on. /// /// ``` /// extern crate simpath; /// use simpath::Simpath; /// use std::env; /// /// fn main() { /// env::set_var("TEST", "/,.,~"); /// let search_path = Simpath::new("TEST"); /// let two = search_path.find("."); /// match two { /// Ok(found) => println!("'.' was found at '{:?}'", found), /// Err(e) => println!("{}", e) /// } /// } /// ``` pub fn new_with_separator(var_name: &str, separator: char) -> Self { let mut search_path = Simpath { separator, name: var_name.to_string(), directories: HashSet::<PathBuf>::new(), #[cfg(feature = "urls")] urls: HashSet::<Url>::new(), }; search_path.add_from_env_var(var_name); search_path } /// Get the currently set separator character that is used when parsing entries from an environment /// variable pub fn separator(&self) -> char { self.separator } /// Get the name associated with the simpath. Note that this could be an empty String /// ``` /// extern crate simpath; /// use simpath::Simpath; /// /// fn main() { /// let search_path = Simpath::new("PATH"); /// println!("Directories in Search Path: {:?}", search_path.name()); /// } /// ``` pub fn name(&self) -> &str { &self.name } /// Get the list of directories that are included in the Search Path /// /// ``` /// extern crate simpath; /// use simpath::Simpath; /// /// fn main() { /// let search_path = Simpath::new("PATH"); /// println!("Directories in Search Path: {:?}", search_path.directories()); /// } /// ``` pub fn directories(&self) -> &HashSet<PathBuf> { &self.directories } #[cfg(feature = "urls")] /// Get the list of URLs that are included in the Search Path /// /// ``` /// extern crate simpath; /// use simpath::Simpath; /// use std::env; /// /// fn main() { /// env::set_var("TEST", "http://ibm.com,https://hp.com"); /// let search_path = Simpath::new("TEST"); /// println!("URLs in Search Path: {:?}", search_path.urls()); /// } /// ``` pub fn urls(&self) -> &HashSet<Url> { &self.urls } /// Try to find a file or resource by name (not full path) on a search path. /// Searching for a file could cause errors, so Result<FoundType, io::Error> is returned /// If it is found `Ok(FoundType)` is returned indicating where the resource/file can be found. /// If it is not found then `Err` is returned. /// /// ``` /// extern crate simpath; /// use simpath::Simpath; /// /// fn main() { /// let search_path = Simpath::new("PATH"); /// match search_path.find("my-file") { /// Ok(_found_dir) => println!("Didn't expect that!!"), /// Err(e) => println!("{}", e.to_string()) /// } /// } /// ``` pub fn find(&self, file_name: &str) -> Result<FoundType, Error> { self.find_type(file_name, FileType::Any) } /// find an entry of a specific `FileType` in a `Path` /// /// ``` /// extern crate simpath; /// use simpath::Simpath; /// /// fn main() { /// use simpath::FileType; /// let search_path = Simpath::new("PATH"); /// match search_path.find_type("my-file", FileType::Directory) { /// Ok(_found_dir) => println!("Didn't expect that!!"), /// Err(e) => println!("{}", e.to_string()) /// } /// } /// ``` pub fn find_type(&self, file_name: &str, file_type: FileType) -> Result<FoundType, Error> { if file_type == FileType::File || file_type == FileType::Directory || file_type == FileType::Any { for search_dir in &self.directories { for entry in fs::read_dir(search_dir)? { let file = entry?; if let Some(filename) = file.file_name().to_str() { if filename == file_name { let found_filetype = file.metadata()?.file_type(); match file_type { FileType::Any => return Ok(FoundType::File(file.path())), FileType::Directory if found_filetype.is_dir() => return Ok(FoundType::Directory(file.path())), FileType::File if found_filetype.is_file() || found_filetype.is_symlink() => return Ok(FoundType::File(file.path())), _ => { /* keep looking */ } } } } } } } #[cfg(feature = "urls")] // Look for a URL that ends with '/file_name' if file_type == FileType::Resource || file_type == FileType::Any { for url in &self.urls { let mut segments = url.path_segments() .ok_or_else(|| Error::new(ErrorKind::NotFound, "Could not get path segments"))?; if segments.next_back() == Some(file_name) { return Ok(FoundType::Resource(url.clone())); } } } Err(Error::new(ErrorKind::NotFound, format!("Could not find type '{:?}' called '{}' in search path '{}'", file_type, file_name, self.name))) } /// Add an to the search path. /// /// if "urls" feature is enabled: /// If it parses as as web Url it will be added to the list of /// base Urls to search, otherwise it will be added to the list of directories to search. /// if "urls" feature is *not* enabled: /// It is assumed to be a directory and added using `add_directory()` /// /// ``` /// extern crate simpath; /// use simpath::Simpath; /// /// fn main() { /// let mut search_path = Simpath::new("PATH"); /// search_path.add("."); /// /// #[cfg(feature = "urls")] /// search_path.add("http://ibm.com"); /// /// println!("{}", search_path); /// } /// ``` pub fn add(&mut self, entry: &str) { #[cfg(not(feature = "urls"))] self.add_directory(entry); #[cfg(feature = "urls")] match Url::parse(entry) { Ok(url) => { match url.scheme() { #[cfg(feature = "urls")] "http" | "https" => self.add_url(&url), "file" => self.add_directory(url.path()), _ => self.add_directory(entry) } } Err(_) => self.add_directory(entry) /* default to being a directory path */ } } /// Add a directory to the list of directories to search for files. /// If the directory passed does not exist, or is not a directory, or cannot be read then it /// will be ignored. /// /// ``` /// extern crate simpath; /// use simpath::Simpath; /// /// fn main() { /// let mut search_path = Simpath::new("PATH"); /// search_path.add_directory("."); /// println!("Directories in Search Path: {:?}", search_path.directories()); /// } /// ``` pub fn add_directory(&mut self, dir: &str) { let path = PathBuf::from(dir); if path.exists() && path.is_dir() && path.read_dir().is_ok() { if let Ok(canonical) = path.canonicalize() { self.directories.insert(canonical); } } } #[cfg(feature = "urls")] /// Add a Url to the list of Base Urls to be used when searching for resources. /// /// ``` /// extern crate simpath; /// extern crate url; /// /// use simpath::Simpath; /// use url::Url; /// /// fn main() { /// let mut search_path = Simpath::new("WEB"); /// search_path.add_url(&Url::parse("http://ibm.com").unwrap()); /// println!("Urls in Search Path: {:?}", search_path.urls()); /// } /// ``` pub fn add_url(&mut self, url: &Url) { self.urls.insert(url.clone()); } /// Check if a search path contains an entry /// /// ``` /// extern crate simpath; /// use simpath::Simpath; /// /// fn main() { /// let mut search_path = Simpath::new("FakeEnvVar"); /// if search_path.contains(".") { /// println!("Well that's a surprise!"); /// } /// } /// ``` pub fn contains(&self, entry: &str) -> bool { if let Ok(canonical) = PathBuf::from(entry).canonicalize() { if self.directories.contains(&canonical) { return true; } } #[cfg(feature = "urls")] if let Ok(url_entry) = Url::parse(entry) { return self.urls.contains(&url_entry); } false } /// Add entries to the search path, by reading them from an environment variable. /// /// The environment variable should have a set of entries separated by the separator character. /// By default the separator char is `":"` (on non-windows platforms) and `";"` (on windows) /// but it can be modified after creation of search path. /// /// The environment variable is parsed using the separator char set at the time this function /// is called. /// /// To be added each entry must exist and be readable. /// /// ``` /// extern crate simpath; /// use simpath::Simpath; /// /// fn main() { /// let mut search_path = Simpath::new("MyPathName"); /// search_path.add_from_env_var("PATH"); /// if search_path.contains(".") { /// println!("'.' was in your 'PATH' and has been added to the search path called '{}'", /// search_path.name()); /// } /// } /// ``` pub fn add_from_env_var(&mut self, var_name: &str) { if let Ok(var_string) = env::var(var_name) { for part in var_string.split(self.separator) { self.add(part); } } } /// Add entries to the search path, by reading them from an environment variable. /// /// The environment variable should have a set of entries separated by the specified /// separator character. /// /// To be added each entry must exist and be readable. /// /// NOTE: The separator char is only used while parsing the specified environment variable and /// *does not* modify the separator character in use in the Simpath after this function completes. /// /// ``` /// extern crate simpath; /// use simpath::Simpath; /// use std::env; /// /// fn main() { /// let mut search_path = Simpath::new("MyPathName"); /// env::set_var("TEST", "/,.,~"); /// search_path.add_from_env_var_with_separator("TEST", ','); /// if search_path.contains(".") { /// println!("'.' was in your 'TEST' environment variable and has been added to the search path called '{}'", /// search_path.name()); /// } /// } /// ``` pub fn add_from_env_var_with_separator(&mut self, var_name: &str, separator: char) { if let Ok(var_string) = env::var(var_name) { for part in var_string.split(separator) { self.add_directory(part); } } } } impl fmt::Display for Simpath { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "Search Path '{}': Directories: {:?}", self.name, self.directories)?; #[cfg(feature = "urls")] write!(f, ", URLs: {:?}", self.urls)?; Ok(()) } } #[cfg(test)] mod test { use std::env; use std::fs; use std::io::Write; use super::{DEFAULT_SEPARATOR_CHAR, FileType}; use super::Simpath; #[test] fn can_create() { Simpath::new("PATH"); } #[test] fn can_create_with_separator() { Simpath::new_with_separator("PATH", ':'); } #[test] fn name_is_saved() { let path = Simpath::new("MyName"); assert_eq!(path.name(), "MyName"); } #[test] fn find_non_existant_file() { let path = Simpath::new("MyName"); assert!(path.find("no_such_file").is_err()); } #[test] fn display_empty_path() { let path = Simpath::new("MyName"); println!("{}", path); } #[test] fn directory_is_added() { let mut path = Simpath::new("MyName"); assert!(path.directories().is_empty()); path.add_directory("."); let cwd = env::current_dir() .expect("Could not get current working directory").to_string_lossy().to_string(); assert!(path.contains(&cwd)); } #[test] fn cannot_add_same_dir_twice() { let mut path = Simpath::new("MyName"); assert!(path.directories().is_empty()); path.add_directory("."); path.add_directory("."); assert_eq!(path.directories().len(), 1); } #[test] fn cant_add_non_dir() { let mut path = Simpath::new("MyName"); assert!(path.directories().is_empty()); path.add_directory("no-such-dir"); assert_eq!(path.contains("no-such-dir"), false); } #[test] fn find_dir_from_env_variable() { // Create a temp dir for test let temp_dir = tempdir::TempDir::new("simpath").unwrap().into_path(); let mut parent_dir = temp_dir.clone(); parent_dir.pop(); // Create a ENV path that includes that dir let var_name = "MyPath"; env::set_var(var_name, &parent_dir); // create a simpath from the env var let path = Simpath::new(var_name); // Check that simpath can find the temp_dir let temp_dir_name = format!("{}.{}", temp_dir.file_stem().unwrap().to_str().unwrap(), temp_dir.extension().unwrap().to_str().unwrap()); assert!(path.find_type(&temp_dir_name, FileType::Directory).is_ok(), "Could not find the simpath temp directory in Path set from env var"); // clean-up let _ = fs::remove_dir_all(temp_dir); } #[test] fn find_file_from_env_variable() { // Create a temp dir for test let temp_dir = tempdir::TempDir::new("simpath").unwrap().into_path(); // Create a ENV path that includes the path to the temp dir let var_name = "MYPATH"; env::set_var(var_name, &temp_dir); // create a simpath from the env var let path = Simpath::new(var_name); // Create a file in the directory let temp_filename = "testfile"; let temp_file_path = format!("{}/{}", temp_dir.display(), temp_filename); let mut file = fs::File::create(&temp_file_path).unwrap(); file.write_all(b"test file contents").unwrap(); // Check that simpath can find the file assert!(path.find_type(temp_filename, FileType::File).is_ok(), "Could not find 'testfile' in Path set from env var"); // clean-up let _ = fs::remove_dir_all(temp_dir); } #[cfg(unix)] #[test] fn find_link_from_env_variable() { // Create a temp dir for test let temp_dir = tempdir::TempDir::new("simpath").unwrap().into_path(); // Create a ENV path that includes the path to the temp dir let var_name = "MYPATH"; env::set_var(var_name, &temp_dir); // create a simpath from the env var let path = Simpath::new(var_name); // Create a file in the directory let temp_filename = "testfile"; let temp_file_path = format!("{}/{}", temp_dir.display(), temp_filename); let mut file = fs::File::create(&temp_file_path).unwrap(); file.write_all(b"test file contents").unwrap(); // Create a link to the file let temp_linkname = "testlink"; let temp_link_path = format!("{}/{}", temp_dir.display(), temp_linkname); std::os::unix::fs::symlink(temp_file_path, temp_link_path).expect("Could not create symlink"); // Check that simpath can find the file assert!(path.find_type(temp_linkname, FileType::File).is_ok(), "Could not find 'testlink' in Path set from env var"); // clean-up let _ = fs::remove_dir_all(temp_dir); } #[test] fn find_dir_using_any_from_env_variable() { // Create a temp dir for test let temp_dir = tempdir::TempDir::new("simpath").unwrap().into_path(); // Create a ENV path that includes that dir let var_name = "MyPath"; env::set_var(var_name, &temp_dir); // create a simpath from the env var let path = Simpath::new(var_name); // Create a file in the directory let temp_filename = "testfile"; let temp_file_path = format!("{}/{}", temp_dir.display(), temp_filename); let mut file = fs::File::create(&temp_file_path).unwrap(); file.write_all(b"test file contents").unwrap(); // Check that simpath can find it assert!(path.find(temp_filename).is_ok(), "Could not find the 'testfile' in Path set from env var"); // clean-up let _ = fs::remove_dir_all(temp_dir); } #[test] fn single_add_from_env_variable() { let var_name = "MyPath"; env::set_var(var_name, "."); let path = Simpath::new(var_name); assert!(path.contains(&env::current_dir() .expect("Could not get current working directory").to_string_lossy().to_string())); } #[test] fn multiple_add_from_env_variable() { let var_name = "MyPath"; env::set_var(var_name, format!(".{}/", DEFAULT_SEPARATOR_CHAR)); let path = Simpath::new(var_name); assert!(path.contains(&env::current_dir() .expect("Could not get current working directory").to_string_lossy().to_string())); assert!(path.contains("/")); } #[test] fn multiple_add_from_env_variable_separator() { let var_name = "MyPath"; env::set_var(var_name, ".,/"); let path = Simpath::new_with_separator(var_name, ','); assert!(path.contains(&env::current_dir() .expect("Could not get current working directory").to_string_lossy().to_string())); assert!(path.contains("/")); } #[test] fn display_a_simpath_with_entries() { let var_name = "MyPath"; env::set_var(var_name, format!(".{}/", DEFAULT_SEPARATOR_CHAR)); let path = Simpath::new(var_name); println!("Simpath can be printed: {}", path); } #[test] fn entry_does_not_exist() { let var_name = "MyPath"; env::set_var(var_name, "/foo"); let path = Simpath::new(var_name); assert_eq!(path.directories().len(), 0); } #[test] fn one_entry_does_not_exist() { let var_name = "MyPath"; env::set_var(var_name, format!(".{}/foo", DEFAULT_SEPARATOR_CHAR)); let path = Simpath::new(var_name); assert_eq!(path.directories().len(), 1); assert!(!path.contains("/foo")); } #[cfg(feature = "urls")] mod url_tests { use std::env; use url::Url; use super::super::FileType; use super::Simpath; const BASE_URL: &str = "https://www.ibm.com"; const EXISTING_RESOURCE: &str = "es-es"; #[test] fn create_from_env() { let var_name = "MyPath"; env::set_var(var_name, BASE_URL); let path = Simpath::new_with_separator(var_name, ','); assert_eq!(path.urls().len(), 1); assert_eq!(path.directories().len(), 0); assert!(path.urls().contains(&Url::parse(BASE_URL) .expect("Could not parse URL"))); } #[test] fn add_url_that_exists() { let mut path = Simpath::new_with_separator("test", ','); path.add_url(&Url::parse(BASE_URL).expect("Could not parse Url")); assert_eq!(path.urls().len(), 1); assert_eq!(path.directories().len(), 0); assert!(path.urls().contains(&Url::parse(BASE_URL) .expect("Could not parse URL"))); } #[test] fn cannot_add_same_url_twice() { let mut path = Simpath::new_with_separator("test", ','); path.add_url(&Url::parse(BASE_URL).expect("Could not parse Url")); path.add_url(&Url::parse(BASE_URL).expect("Could not parse Url")); assert_eq!(path.urls().len(), 1); assert_eq!(path.directories().len(), 0); assert!(path.urls().contains(&Url::parse(BASE_URL) .expect("Could not parse URL"))); } #[test] fn find_resource_not_exist() { let mut search_path = Simpath::new("TEST"); search_path.add_url(&Url::parse(BASE_URL).expect("Could not parse Url")); assert!(search_path.find_type("/no-way-this-exists", FileType::Resource).is_err(), "should not find the resource"); } #[test] fn find_existing_resource() { let mut search_path = Simpath::new("TEST"); search_path.add_url(&Url::parse(BASE_URL).expect("Could not parse Url") .join(EXISTING_RESOURCE).expect("Could not join to Url")); search_path.find_type(EXISTING_RESOURCE, FileType::Resource).expect("Could not find resource"); } #[test] fn contains_url_that_exists() { let var_name = "MyPath"; env::set_var(var_name, BASE_URL); let path = Simpath::new_with_separator(var_name, ','); assert!(path.contains(BASE_URL)); } #[test] fn display_path_with_directory_and_url() { let var_name = "MyPath"; env::set_var(var_name, format!("~,{}", BASE_URL)); let path = Simpath::new_with_separator(var_name, ','); println!("{}", path); } } }