samepath, fix normalize, canonical

+stdlib/+fileio/normalize.m

@@ -10,4 +10,6 @@
 
 n = stdlib.fileio.posix(File(expanduser(p)).toPath().normalize());
 
+if(strlength(n) == 0), n = "."; end
+
 end

+stdlib/+fileio/samepath.m

@@ -7,18 +7,19 @@
 
 import java.io.File
 import java.nio.file.Files
-import stdlib.fileio.canonical
 
 issame = false;
-% java.nio.file.Files needs CANONICAL -- not just absolute path
-p1 = canonical(path1);
-if ~stdlib.fileio.exists(p1), return, end
-p1 = File(p1).toPath();
+if ~stdlib.fileio.exists(path1) || ~stdlib.fileio.exists(path2)
+  return
+end
+
+% not correct without canoncial(). Normalize() doesn't help.
+path1 = stdlib.fileio.canonical(path1);
+path2 = stdlib.fileio.canonical(path2);
 
-p2 = canonical(path2);
-if ~stdlib.fileio.exists(p2), return, end
-p2 = File(p2).toPath();
+issame = Files.isSameFile(File(path1).toPath(), File(path2).toPath());
 
-issame = Files.isSameFile(p1, p2);
+% alternative, lower-level method is lexical only (not suitable for us):
+% https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/File.html#equals(java.lang.Object)
 
 end

test/TestFileImpure.m

@@ -12,8 +12,8 @@
 ref_is_write = {true, false}
 in_expand = {"", "~abc", "~", "~/foo"}
 ref_expand
-in_same = {"", tempname, "~/b/..", "."}
-other_same = {"", tempname, "~/c/..", fullfile(pwd, "a/..")}
+in_same = {"", tempname, "..", ".."}
+other_same = {"", tempname, "./..", fullfile(pwd, "..")}
 ref_same = {false, false, true, true}
 end
 
@@ -124,7 +124,7 @@ function test_canonical(tc)
 
 % all non-existing files
 
-tc.verifyEqual(stdlib.canonical(""), "")
+tc.verifyEqual(stdlib.canonical(""), ".")
 
 pabs = stdlib.canonical('2foo');
 tc.verifyThat(pabs, StartsWithSubstring("2foo"))
@@ -207,12 +207,12 @@ function test_makedir(tc)
 tc.assertTrue(isfolder(d))
 end
 
-
+%%
 function test_samepath(tc, in_same, other_same, ref_same)
 tc.verifyEqual(stdlib.samepath(in_same, other_same), ref_same)
 end
 
-
+%%
 function test_which_name(tc)
 
 tc.verifyEmpty(stdlib.which(tempname))

test/TestFilePure.m

@@ -205,7 +205,7 @@ function test_absolute_path(tc)
 
 function test_normalize(tc)
 
-tc.verifyEqual(stdlib.normalize(""), "")
+tc.verifyEqual(stdlib.normalize(""), ".")
 
 pabs = stdlib.normalize('2foo//');
 tc.verifyEqual(pabs, "2foo")