read_symlink: array

Author: scivision

+stdlib/+dotnet/read_symlink.m

@@ -5,8 +5,13 @@
 try
   h = System.IO.FileInfo(p);
   r = string(h.LinkTarget);
+  % on Unix, this can be empty if the file is not a symlink
 catch
-  r = string.empty;
+  r = "";
+end
+
+if isempty(r)
+  r = "";
 end
 
 end

+stdlib/+java/read_symlink.m

@@ -10,7 +10,7 @@
   % https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/nio/file/Files.html#readSymbolicLink(java.nio.file.Path)
   r = string(java.nio.file.Files.readSymbolicLink(javaPathObject(r)));
 else
-  r = string.empty;
+  r = "";
 end
 
 end

+stdlib/+native/read_symlink.m

@@ -1,8 +1,7 @@
 function r = read_symlink(file)
 
 [ok, r] = isSymbolicLink(file);
-if ~ok
-  r = string.empty; 
-end
+
+r(~ok) = "";
 
 end

+stdlib/+python/read_symlink.m

@@ -1,6 +1,6 @@
 function r = read_symlink(p)
 
-r = string.empty;
+r = "";
 
 if ~stdlib.is_symlink(p), return, end
 

+stdlib/+sys/read_symlink.m

@@ -1,6 +1,6 @@
 function r = read_symlink(p)
 
-r = string.empty;
+r = "";
 
 if ~stdlib.is_symlink(p), return, end
 

+stdlib/read_symlink.m

@@ -5,12 +5,16 @@
 
 function r = read_symlink(file, backend)
 arguments
-  file {mustBeTextScalar}
+  file string
   backend (1,:) string = ["native", "java", "dotnet", "python", "sys"]
 end
 
-fun = hbackend(backend, "read_symlink", 'R2024b');
+[fun, b] = hbackend(backend, "read_symlink", 'R2024b');
 
-r = fun(file);
+if isscalar(file) || b == "native"
+  r = fun(file);
+else
+  r = arrayfun(fun, file);
+end
 
 end

test/TestSymlink.m

@@ -66,7 +66,7 @@ function test_is_symlink_array(tc, ir_backend)
 
 function test_read_symlink_empty(tc, Pre, ir_backend)
 try
-  tc.verifyEmpty(stdlib.read_symlink(Pre, ir_backend))
+  tc.verifyEqual(stdlib.read_symlink(Pre, ir_backend), "")
 catch e
   tc.verifyEqual(e.identifier, 'stdlib:hbackend:NameError', e.message)
 end
@@ -83,6 +83,16 @@ function test_read_symlink(tc, ir_backend)
 end
 
 
+function test_read_symlink_array(tc, ir_backend)
+try
+  r = stdlib.read_symlink([tc.link, mfilename() + ".m"], ir_backend);
+  tc.verifyClass(r, 'string')
+  tc.verifyEqual(r, [tc.target, ""], "failed to detect own link")
+catch e
+  tc.verifyEqual(e.identifier, 'stdlib:hbackend:NameError', e.message)
+end
+end
+
 function test_create_symlink(tc, cs_backend)
 tc.assumeNotEmpty(which("stdlib." + cs_backend + ".create_symlink"))
 tc.applyFixture(matlab.unittest.fixtures.SuppressedWarningsFixture(["MATLAB:io:filesystem:symlink:TargetNotFound","MATLAB:io:filesystem:symlink:FileExists"]))