fixes #23663; Add hash() for Path (#23664)

fixes #23663

lib/std/paths.nim

@@ -9,7 +9,7 @@ export osseps
 import std/envvars
 import std/private/osappdirs
 
-import std/pathnorm
+import std/[pathnorm, hashes, sugar, strutils]
 
 from std/private/ospaths2 import  joinPath, splitPath,
                                   ReadDirEffect, WriteDirEffect,
@@ -25,6 +25,13 @@ export ReadDirEffect, WriteDirEffect
 type
   Path* = distinct string
 
+func hash*(x: Path): Hash =
+  let x = x.string.dup(normalizePath)
+  if FileSystemCaseSensitive:
+    result = x.hash
+  else:
+    result = x.toLowerAscii.hash
+
 template `$`*(x: Path): string =
   string(x)
 

tests/stdlib/tpaths.nim

@@ -6,15 +6,12 @@ import std/paths
 import std/assertions
 import pathnorm
 from std/private/ospaths2 {.all.} import joinPathImpl
-import std/sugar
+import std/[sugar, sets]
 
 
 proc normalizePath*(path: Path; dirSep = DirSep): Path =
   result = Path(pathnorm.normalizePath(path.string, dirSep))
 
-func `==`(x, y: Path): bool =
-  x.string == y.string
-
 func joinPath*(parts: varargs[Path]): Path =
   var estimatedLen = 0
   var state = 0
@@ -231,4 +228,11 @@ block ospaths:
   when doslikeFileSystem:
     doAssert joinPath(Path"C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\Common7\\Tools\\", Path"..\\..\\VC\\vcvarsall.bat") == r"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat".Path
     doAssert joinPath(Path"C:\\foo", Path"..\\a") == r"C:\a".Path
-    doAssert joinPath(Path"C:\\foo\\", Path"..\\a") == r"C:\a".Path
+    doAssert joinPath(Path"C:\\foo\\", Path"..\\a") == r"C:\a".Path
+
+
+block: # bug #23663
+  var s: HashSet[Path]
+  s.incl("/a/b/c/..".Path)
+  doAssert "/a/b/".Path in s
+  doAssert "/a/b/c".Path notin s