Merge pull request #6 from andrewdavidmackenzie/simpath-5

simpath-5 Fixes #5

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "simpath"
-version = "1.3.1"
+version = "1.4.1"
 authors = ["Andrew Mackenzie <[email protected]>"]
 description = "Search for files on a path defined in an environment variable"
 license = "MIT"

src/lib.rs

@@ -1,22 +1,44 @@
+#![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 colon-separated directories
+//! specified. They are usually used to find a file that resides in one of the directories.
+//!
 use std::path::PathBuf;
 use std::fmt;
 use std::env;
 use std::fs;
 use std::io::{Error, ErrorKind};
 
 #[derive(Clone, Debug)]
+/// `Simpath` is the struct returned when you create a new on using a named environment variable
+/// which you then use to interact with the `Path`
 pub struct Simpath {
     name: String,
-    dirs: Vec<PathBuf>
+    entries: Vec<PathBuf>
 }
 
 #[derive(Debug)]
+/// `FileType` can be used to find an entry in a path of a specific type (`Directory`, `File`) or
+/// of `Any` type
 pub enum FileType {
+    /// An entry in the `Path` of type `File`
     File,
+    /// An entry in the `Path` of type `Directory`
     Directory,
+    /// An entry in the `Path` of `Any` types
     Any
 }
 
+/// When validating a `Path` 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
@@ -44,7 +66,7 @@ impl Simpath {
     pub fn new(var_name: &str) -> Self {
         let mut search_path = Simpath {
             name: var_name.to_string(),
-            dirs: vec!()
+            entries: vec!()
         };
 
         search_path.add_from_env_var(var_name);
@@ -53,6 +75,15 @@ impl Simpath {
     }
 
     /// 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
     }
@@ -70,7 +101,7 @@ impl Simpath {
     /// ```
     ///
     pub fn directories(&self) -> &Vec<PathBuf> {
-        &self.dirs
+        &self.entries
     }
 
     /// Try to find a file by filename (not full path) on a search path.
@@ -95,8 +126,23 @@ impl Simpath {
         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<PathBuf, Error> {
-        for search_dir in &self.dirs {
+        for search_dir in &self.entries {
             for entry in fs::read_dir(search_dir)? {
                 let file = entry?;
                 if let Some(filename) = file.file_name().to_str() {
@@ -136,13 +182,11 @@ impl Simpath {
     pub fn add_directory(&mut self, dir: &str) {
         let path = PathBuf::from(dir);
         if path.exists() && path.is_dir() && path.read_dir().is_ok() {
-            self.dirs.push(path);
+            self.entries.push(path);
         }
     }
 
-    /// Check if a search path contains a directory
-    ///
-    ///
+    /// Check if a search path contains an entry
     /// ```
     /// extern crate simpath;
     /// use simpath::Simpath;
@@ -154,9 +198,9 @@ impl Simpath {
     ///     }
     /// }
     /// ```
-    pub fn contains(&self, dir: &str) -> bool {
-        for search_dir in &self.dirs {
-            if search_dir.to_str().unwrap() == dir {
+    pub fn contains(&self, entry: &str) -> bool {
+        for search_dir in &self.entries {
+            if search_dir.to_str().unwrap() == entry {
                 return true;
             }
         }
@@ -188,12 +232,30 @@ impl Simpath {
             }
         }
     }
+
+    /// `validate` checks that all the entries in the `Path` are of a valid syntax, exist on
+    /// the file system and can be read
+    pub fn validate(&self) -> Vec<PathError> {
+        let mut errors = vec!();
+
+        for entry in &self.entries {
+            if !entry.exists() {
+                errors.push(PathError::DoesNotExist(entry.to_str().unwrap().into()));
+            }
+
+            if fs::metadata(entry).is_err() {
+                errors.push(PathError::CannotRead(entry.to_str().unwrap().into()));
+            }
+        }
+
+        errors
+    }
 }
 
 impl fmt::Display for Simpath {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "Search Path: '{}', Directories: {{", self.name).unwrap();
-        for dir in &self.dirs {
+        for dir in &self.entries {
             write!(f, "'{}', ", dir.display()).unwrap();
 
         }
@@ -354,4 +416,25 @@ mod test {
 
         println!("Simpath can be printed: {}", path);
     }
+
+    #[test]
+    fn entry_does_not_exist() {
+        let var_name = "MyPathEnv";
+        env::set_var(var_name, "/foo");
+        let mut path = Simpath::new("MyName");
+        path.add_from_env_var(var_name);
+
+        assert_eq!(path.directories().len(), 0);
+    }
+
+    #[test]
+    fn one_entry_does_not_exist() {
+        let var_name = "MyPathEnv";
+        env::set_var(var_name, ".:/foo");
+        let mut path = Simpath::new("MyName");
+        path.add_from_env_var(var_name);
+
+        assert_eq!(path.directories().len(), 1);
+        assert_eq!(path.validate().len(), 0);
+    }
 }