lib/std: add some cached services on Path

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/lib/standard/file.nit b/lib/standard/file.nit
index 3a1eb1d..554a854 100644 (file)
--- a/lib/standard/file.nit
+++ b/lib/standard/file.nit
@@ -374,8 +374,42 @@ class Path
        # var path = "/tmp/somefile".to_path
        # assert path.filename == "somefile"
        # ~~~
+       #
+       # The result does not depend of the file system, thus is cached for efficiency.
        var filename: String = path.basename is lazy
 
+       # The path simplified by removing useless `.`, removing `//`, and resolving `..`
+       #
+       # ~~~
+       # var path = "somedir/./tmp/../somefile".to_path
+       # assert path.simplified.to_s == "somedir/somefile"
+       # ~~~
+       #
+       # See `String:simplify_path` for details.
+       #
+       # The result does not depend of the file system, thus is cached for efficiency.
+       var simplified: Path is lazy do
+               var res = path.simplify_path.to_path
+               res.simplified = res
+               return res
+       end
+
+       # Return the directory part of the path.
+       #
+       # ~~~
+       # var path = "/foo/bar/baz".to_path
+       # assert path.dir.to_s == "/foo/bar"
+       # assert path.dir.dir.to_s == "/foo"
+       # assert path.dir.dir.dir.to_s == "/"
+       # ~~~
+       #
+       # See `String:dirname` for details.
+       #
+       # The result does not depend of the file system, thus is cached for efficiency.
+       var dir: Path is lazy do
+               return path.dirname.to_path
+       end
+
        # Last error produced by I/O operations.
        #
        # ~~~
@@ -664,8 +698,8 @@ class Path
                end
        end
 
-       redef fun ==(other) do return other isa Path and path.simplify_path == other.path.simplify_path
-       redef fun hash do return path.simplify_path.hash
+       redef fun ==(other) do return other isa Path and simplified.path == other.simplified.path
+       redef fun hash do return simplified.path.hash
 end
 
 # Information on a file