is_exe: exists check for speed

Author: scivision

+stdlib/exists.m

@@ -17,6 +17,7 @@
 end
 
 if use_java
+  % Windows: does NOT detect App Execution Aliases
 % https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/nio/file/Files.html#exists(java.nio.file.Path,java.nio.file.LinkOption...)
 % this takes 2x longer than java.io.File.exists()
 % opt = javaLinkOption();

+stdlib/is_exe.m

@@ -9,6 +9,8 @@
   use_java (1,1) logical = false
 end
 
+ok = false;
+if ~stdlib.exists(p), return, end
 
 if use_java
 % about the same time as fileattrib
@@ -20,11 +22,6 @@
 
 else
 
-if ~stdlib.len(p)
-  ok = false;
-  return
-end
-
 [status, v] = fileattrib(p);
 
 ok = status ~= 0 && (v.UserExecute || (~isnan(v.GroupExecute) && v.GroupExecute) || (~isnan(v.OtherExecute) && v.OtherExecute));

+stdlib/is_readable.m

@@ -2,14 +2,14 @@
 %
 % non-existant file is false
 
-function ok = is_readable(file, use_java)
+function ok = is_readable(p, use_java)
 arguments
-  file (1,1) string
+  p (1,1) string
   use_java (1,1) logical = false
 end
 
 ok = false;
-if ~stdlib.exists(file, use_java), return, end
+if ~stdlib.exists(p), return, end
 % exists() check speeds up by factor of 50x on macOS for Java or non-Java
 
 if use_java
@@ -19,11 +19,11 @@
   % file = stdlib.absolute(file, "", false, true);
   % ok = java.nio.file.Files.isReadable(java.io.File(file).toPath());
 
-ok = javaFileObject(file).canRead();
+ok = javaFileObject(p).canRead();
 
 else % use_java
 
-[status, v] = fileattrib(file);
+[status, v] = fileattrib(p);
 
 ok = status ~= 0 && (v.UserRead || (~isnan(v.GroupRead) && v.GroupRead) || (~isnan(v.OtherRead) && v.OtherRead));
 

+stdlib/is_writable.m

@@ -1,15 +1,15 @@
 %% IS_WRITABLE is path writable
 %
-% non-existant file is false
+% non-existant path is false
 
-function ok = is_writable(file, use_java)
+function ok = is_writable(p, use_java)
 arguments
-  file (1,1) string
+  p (1,1) string
   use_java (1,1) logical = false
 end
 
 ok = false;
-if ~stdlib.exists(file, use_java), return, end
+if ~stdlib.exists(p), return, end
 % exists() check speeds up by factor of 50x on macOS for Java or non-Java
 
 
@@ -20,11 +20,11 @@
   % file = stdlib.absolute(file, "", false, true);
   % ok = java.nio.file.Files.isWritable(java.io.File(file).toPath());
 
-ok = javaFileObject(file).canWrite();
+ok = javaFileObject(p).canWrite();
 
 else
 
-[status, v] = fileattrib(file);
+[status, v] = fileattrib(p);
 
 ok = status ~= 0 && (v.UserWrite || (~isnan(v.GroupWrite) && v.GroupWrite) || (~isnan(v.OtherWrite) && v.OtherWrite));
 

+stdlib/samepath.m

@@ -22,7 +22,7 @@
 % simpler our way than
 % https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/nio/file/Files.html#isSameFile(java.nio.file.Path,java.nio.file.Path)
 
-issame = stdlib.exists(path1, false) && stdlib.exists(path2, false) && ...
+issame = stdlib.exists(path1) && stdlib.exists(path2) && ...
          stdlib.canonical(path1, false, false) == stdlib.canonical(path2, false, false);
 
 end