add handle2filename()

Author: scivision

+stdlib/handle2filename.m

@@ -0,0 +1,13 @@
+function name = handle2filename(fileHandle)
+% HANDLE2FILENAME Convert a file handle to a filename
+arguments
+    fileHandle (1,1) {mustBeInteger}
+end
+
+if fileHandle >= 0
+  name = stdlib.posix(fopen(fileHandle));
+else
+  name = string.empty;
+end
+
+end

+stdlib/posix.m

@@ -1,11 +1,13 @@
 function p = posix(p)
 %% posix(file)
-% convert a path to a Posix path separated with "/" even on Windows.
+% convert a path to a Posix string path separated with "/" even on Windows.
 % If Windows path also have escaping "\" this breaks
 arguments
   p string
 end
 
+p = string(p);
+
 if ispc
   p = strrep(p, "\", "/");
 end

+stdlib/stem.m

@@ -6,6 +6,4 @@
 
 [~, p] = fileparts(path);
 
-p = stdlib.posix(p);
-
 end

test/TestFileImpure.m

@@ -336,6 +336,13 @@ function test_get_permissions(tc)
 tc.verifyThat(p, StartsWithSubstring("r"))
 end
 
+function test_handle2filename(tc)
+tc.verifyEqual(stdlib.handle2filename(0), '"' + "stdin" + '"')
+tc.verifyEqual(stdlib.handle2filename(1), '"' + "stdout" + '"')
+tc.verifyEqual(stdlib.handle2filename(2), '"' + "stderr" + '"')
+tc.verifyEmpty(stdlib.handle2filename(fopen(tempname)))
+end
+
 function test_java_version(tc)
 v = stdlib.java_version();
 L = strlength(v);