feat(fs): add as_dir/as_file to convert from path

src/fs/real/dir.rs

@@ -1,5 +1,5 @@
 //
-use std::path::Path;
+use std::path::{Path, PathBuf};
 
 use crate::fs::{DirItem, DirItemIterator, Error, Result};
 
@@ -27,6 +27,10 @@ impl<'base, 'path> DirReal<'base, 'path> {
         Self { path }
     }
 
+    pub fn path(&self) -> PathBuf {
+        self.path.full_path()
+    }
+
     pub fn create(&mut self) -> Result<()> {
         self.path.check_error()?;
         std::fs::create_dir(self.path.full_path()).map_err(Into::into)

src/fs/real/file.rs

@@ -1,5 +1,5 @@
 //
-use std::path::Path;
+use std::path::{Path, PathBuf};
 
 use crate::fs::Result;
 
@@ -15,6 +15,10 @@ impl<'base, 'path> FileReal<'base, 'path> {
         }
     }
 
+    pub fn path(&self) -> PathBuf {
+        self.path.full_path()
+    }
+
     pub fn reader(&mut self) -> Result<ReaderReal> {
         self.path.check_error()?;
         ReaderReal::new(&self.path.full_path())

src/fs/real/path.rs

@@ -3,6 +3,8 @@ use std::path::{Path, PathBuf};
 
 use crate::fs::{Error, Result};
 
+use super::{dir::DirReal, file::FileReal};
+
 #[derive(Debug)]
 pub struct PathReal<'base, 'path> {
     base: &'base Path,
@@ -74,6 +76,24 @@ impl<'base, 'path> PathReal<'base, 'path> {
         self.check_error()?;
         Ok(self.full_path().is_file())
     }
+
+    pub fn as_dir(&mut self) -> Result<Option<DirReal<'base, 'path>>> {
+        self.check_error()?;
+        if self.full_path().is_dir() {
+            Ok(Some(DirReal::new(self.base, self.path)))
+        } else {
+            Ok(None)
+        }
+    }
+
+    pub fn as_file(&mut self) -> Result<Option<FileReal<'base, 'path>>> {
+        self.check_error()?;
+        if self.full_path().is_file() {
+            Ok(Some(FileReal::new(self.base, self.path)))
+        } else {
+            Ok(None)
+        }
+    }
 }
 impl From<PathReal<'_, '_>> for PathBuf {
     fn from(path: PathReal) -> Self {

tests/fs.rs

@@ -32,6 +32,65 @@ mod path_of {
     }
 }
 
+mod path {
+    use super::*;
+
+    #[test]
+    fn path_is_dir_as_dir_some() -> TestResult {
+        let fs = fs::temp().expect("temp fs");
+
+        let path = fs.base().join("foo");
+        let mut dir = fs.dir(&path);
+        dir.create().expect("create");
+
+        let_assert!(Ok(Some(as_dir)) = fs.path(&path).as_dir());
+
+        assert_eq!(dir.path(), as_dir.path());
+
+        Ok(())
+    }
+
+    #[test]
+    fn path_is_file_as_dir_none() -> TestResult {
+        let fs = fs::temp().expect("temp fs");
+
+        let path = fs.base().join("foo");
+        let mut file = fs.file(&path);
+        file.write("contents").expect("create");
+
+        let_assert!(Ok(Some(mut as_file)) = fs.path(&path).as_file());
+
+        assert_eq!(file.path(), as_file.path());
+        assert_eq!(as_file.reader().expect("reader").to_string(), "contents");
+
+        Ok(())
+    }
+    #[test]
+    fn path_is_dir_as_file_none() -> TestResult {
+        let fs = fs::temp().expect("temp fs");
+
+        let path = fs.base().join("foo");
+        let mut dir = fs.dir(&path);
+        dir.create().expect("create");
+
+        let_assert!(Ok(None) = fs.path(&path).as_file());
+
+        Ok(())
+    }
+    #[test]
+    fn path_is_file_as_file_some() -> TestResult {
+        let fs = fs::temp().expect("temp fs");
+
+        let path = fs.base().join("foo");
+        let mut file = fs.file(&path);
+        file.write("contents").expect("create");
+
+        let_assert!(Ok(None) = fs.path(&path).as_dir());
+
+        Ok(())
+    }
+}
+
 mod file {
     use super::*;