Don't overwrite the persistent variable when hacking paths

.github/workflows/main.yml

@@ -79,7 +79,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        octave: [8.4.0]
+        octave: [9.1.0]
         sympy: [1.5.1, 1.6.2, 1.7.1, 1.8, 1.9, 1.10.1, 1.11.1, 1.12]
         include:
           - octave: 5.1.0
@@ -106,6 +106,8 @@ jobs:
             sympy: 1.12
           - octave: 8.3.0
             sympy: 1.12
+          - octave: 8.4.0
+            sympy: 1.12
     steps:
       - uses: actions/checkout@v4
       - name: Container setup
@@ -276,7 +278,7 @@ jobs:
   ubuntu2204_pip_sympy:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Octave and Python
         run: |
           uname -a

inst/private/python_ipc_sysoneline.m

@@ -1,4 +1,4 @@
-%% Copyright (C) 2014-2018, 2022 Colin B. Macdonald
+%% Copyright (C) 2014-2018, 2022, 2024 Colin B. Macdonald
 %% Copyright (C) 2018-2019 Osella Giancarlo
 %%
 %% This file is part of OctSymPy.
@@ -69,7 +69,7 @@
   % Windows.  We have a 8000 char budget, and the header uses all
   % of it.
   mydir = fileparts (mfilename ('fullpath'));
-  mydir = strrep ([mydir filesep()], '\', '\\');
+  mydir = strrep ([mydir filesep()], '\', '\\\\');
   % execfile() only works on python 2
   headers = ['exec(open(\"' mydir 'python_header.py\").read()); '];
   %s = python_header_embed2();
@@ -161,14 +161,12 @@
     % dbl-quote is rather special here
     % /" -> ///////" -> ///" -> /" -> "
     s{i} = strrep(s{i}, '"', '\\\"');
-
-  if (ispc () && (~isunix ()))
-    %Escape sequence for WIN (Octave & Matlab)
-    s{i} = strrep(s{i}, '>', '^>');
-    s{i} = strrep(s{i}, '<', '^<');
-  end
-
 
+    if (ispc () && (~isunix ()))
+      % escape sequence for Windows (Octave & Matlab)
+      s{i} = strrep(s{i}, '>', '^>');
+      s{i} = strrep(s{i}, '<', '^<');
+    end
 
   end
 end

inst/private/python_ipc_system.m

@@ -1,4 +1,4 @@
-%% Copyright (C) 2014-2016, 2022 Colin B. Macdonald
+%% Copyright (C) 2014-2016, 2022, 2024 Colin B. Macdonald
 %% Copyright (C) 2022 Alex Vong
 %%
 %% This file is part of OctSymPy.
@@ -133,10 +133,18 @@
 	     tmpfilename, fd);
     end
 
+    % On Windows, tmp file is like C:\Users\Zoe\AppData\Local\Temp\oct-rZDdea
+    % and this causes issues for msys2 [1].  It seems the same files are available
+    % in /tmp/ (?) and cygpath translates them, but careful not to change the
+    % persistent variable [2].
+    % [1] https://github.com/gnu-octave/symbolic/issues/1182
+    % [2] https://savannah.gnu.org/bugs/index.php?65735
     if python_env_is_cygwin_like (pyexec)
-      tmpfilename = cygpath (tmpfilename);
+      _tmpfilename = cygpath (tmpfilename);
+    else
+      _tmpfilename = tmpfilename;
     end
-    [status, out] = system ([pyexec ' ' tmpfilename]);
+    [status, out] = system ([pyexec ' ' _tmpfilename]);
   end
 
   info.raw = out;