treat URLs mostly as not existing

Author: scivision

+stdlib/absolute.m

@@ -23,6 +23,10 @@
   expand_tilde (1,1) logical = true
 end
 
+c = "";
+
+if stdlib.is_url(p), return; end
+
 if expand_tilde
   c = stdlib.expanduser(p);
 else

+stdlib/canonical.m

@@ -18,15 +18,16 @@
   expand_tilde (1,1) logical = true
 end
 
+c = "";
+
+if stdlib.is_url(p), return; end
 
 if expand_tilde
   e = stdlib.expanduser(p);
 else
   e = p;
 end
 
-c = "";
-
 if ~stdlib.len(e), return, end
 
 if ispc && (startsWith(e, "\\") || startsWith(e, "//"))

+stdlib/create_symlink.m

@@ -14,9 +14,10 @@
   link (1,1) string
 end
 
-
 ok = false;
 
+if stdlib.is_url(target) || stdlib.is_url(link), return; end
+
 if stdlib.exists(link), return, end
 
 try
@@ -56,7 +57,7 @@
 
 end
 
-
+%!assert (create_symlink("https://invalid", "https://invalid"), false)
 %!test
 %! if !ispc
 %!   assert(create_symlink(tempname, tempname))

+stdlib/expanduser.m

@@ -12,6 +12,10 @@
   p (1,1) string
 end
 
+e = "";
+
+if stdlib.is_url(p), return; end
+
 e = stdlib.drop_slash(p);
 
 L = stdlib.len(e);

+stdlib/extract_zstd.m

@@ -7,6 +7,8 @@ function extract_zstd(archive, out_dir)
   out_dir (1,1) string
 end
 
+assert(~stdlib.is_url(archive) && ~stdlib.is_url(out_dir), "archive and out_dir must not be URLs")
+
 archive = stdlib.absolute(archive);
 out_dir = stdlib.absolute(out_dir);
 

+stdlib/file_checksum.m

@@ -2,7 +2,7 @@
 % read in chunks to avoid excessive RAM use
 %
 %%% Inputs
-% * file: file to hash
+% * file: file or to hash
 % * method:  "MD5", "SHA-1", "SHA-256", etc.
 %%% Outputs
 % * hash: string hash
@@ -15,6 +15,8 @@
   method (1,1) string
 end
 
+assert(~stdlib.is_url(file), "file_checksum does not accept URLs")
+
 if strcmp(method, "sha256") || strcmp(method, "SHA256")
   method = "SHA-256";
 end

+stdlib/file_size.m

@@ -1,4 +1,9 @@
-% FILE_SIZE size in bytes of file
+%% FILE_SIZE size in bytes of file
+%
+%%% Inputs
+% * p: path to file
+%%% Outputs
+% * s: size in bytes, or empty if file does not exist
 
 function s = file_size(p)
 arguments
@@ -7,9 +12,9 @@
 
 s = [];
 
-if ~isfile(p)
-  return
-else
+if stdlib.is_url(p), return, end
+
+if isfile(p)
   s = dir(p);
   if ~isempty(s)
     s = s.bytes;

+stdlib/filename.m

@@ -1,4 +1,8 @@
-% FILENAME file name of path
+%% FILENAME file name of path
+%
+%%% Inputs
+% p: path to extract filename from
+%%% Outputs
 % filename (including suffix) without directory
 
 function f = filename(p)

+stdlib/get_modtime.m

@@ -1,4 +1,9 @@
 %% GET_MODTIME get path modification time
+%
+%%% Inputs
+% * p: path to examine
+%%% Outputs
+% * t: modification time, or empty if path does not exist
 
 function t = get_modtime(p)
 arguments

+stdlib/hard_link_count.m

@@ -9,7 +9,7 @@
   p (1,1) string
 end
 
-if ispc || ~isfile(p)
+if ispc || stdlib.is_url(p) || ~isfile(p)
   c = [];
   return
 end