gh-36779: Remove the pycygwin package

    
It was only needed for Cygwin (to handle path conversions), and we're
dropping Cygwin support for real now.

Depends on #36769
    
URL: #36779
Reported by: Michael Orlitzky
Reviewer(s): Dima Pasechnik

build/pkgs/sagelib/dependencies

@@ -1,4 +1,4 @@
-FORCE $(SCRIPTS) boost_cropped $(BLAS) brial cliquer cypari cysignals cython ecl eclib ecm flint libgd gap giac givaro glpk gmpy2 gsl iml importlib_metadata importlib_resources jupyter_core lcalc lrcalc_python libbraiding libhomfly libpng linbox m4ri m4rie memory_allocator mpc mpfi mpfr $(MP_LIBRARY) ntl numpy pari pip pkgconfig planarity ppl pplpy primesieve primecount primecountpy pycygwin $(PYTHON) requests rw sage_conf singular symmetrica typing_extensions $(PCFILES) | $(PYTHON_TOOLCHAIN) sage_setup $(PYTHON) pythran
+FORCE $(SCRIPTS) boost_cropped $(BLAS) brial cliquer cypari cysignals cython ecl eclib ecm flint libgd gap giac givaro glpk gmpy2 gsl iml importlib_metadata importlib_resources jupyter_core lcalc lrcalc_python libbraiding libhomfly libpng linbox m4ri m4rie memory_allocator mpc mpfi mpfr $(MP_LIBRARY) ntl numpy pari pip pkgconfig planarity ppl pplpy primesieve primecount primecountpy $(PYTHON) requests rw sage_conf singular symmetrica typing_extensions $(PCFILES) | $(PYTHON_TOOLCHAIN) sage_setup $(PYTHON) pythran
 
 ----------
 All lines of this file are ignored except the first.

src/requirements.txt.m4

@@ -32,7 +32,6 @@ dnl ... already needed by sage.env
 pkgconfig==esyscmd(`printf $(sed "s/[.]p.*//;" ../pkgconfig/package-version.txt)')
 pplpy==esyscmd(`printf $(sed "s/[.]p.*//;" ../pplpy/package-version.txt)')
 primecountpy==esyscmd(`printf $(sed "s/[.]p.*//;" ../primecountpy/package-version.txt)')
-pycygwin==esyscmd(`printf $(sed "s/[.]p.*//;" ../pycygwin/package-version.txt)'); sys_platform == 'cygwin'
 requests==esyscmd(`printf $(sed "s/[.]p.*//;" ../requests/package-version.txt)')
 typing_extensions==esyscmd(`printf $(sed "s/[.]p.*//;" ../typing_extensions/package-version.txt)')
 

src/sage/interfaces/jmoldata.py

@@ -85,10 +85,6 @@ def jmolpath(self):
         """
         jmolpath = os.path.join(JMOL_DIR, "JmolData.jar")
 
-        if sys.platform == 'cygwin':
-            import cygwin
-            jmolpath = cygwin.cygpath(jmolpath, 'w')
-
         return jmolpath
 
     def is_jmol_available(self):
@@ -129,8 +125,6 @@ def export_image(self,
 
         - datafile -- full path to the data file Jmol can read or
           text of a script telling Jmol what to read or load.
-          If it is a script and the platform is cygwin, the filenames in
-          the script should be in native windows format.
 
         - datafile_cmd -- (default ``'script'``)  ``'load'`` or ``'script'``
           should be ``"load"`` for a data file.
@@ -180,10 +174,6 @@ def export_image(self,
             sage: archive = NamedTemporaryFile(suffix=".zip")
             sage: D.export_jmol(archive.name)                                           # needs sage.plot
             sage: archive_native = archive.name
-            sage: import sys
-            sage: if sys.platform == 'cygwin':
-            ....:     import cygwin
-            ....:     archive_native = cygwin.cygpath(archive_native, 'w')
             sage: script  = f'set defaultdirectory "f{archive_native}"\n'
             sage: script += 'script SCRIPT\n'
             sage: with NamedTemporaryFile(suffix=".png") as testfile:   # optional - java, needs sage.plot
@@ -198,12 +188,6 @@ def export_image(self,
         jmolpath = self.jmolpath()
         target_native = targetfile
 
-        if sys.platform == 'cygwin':
-            import cygwin
-            target_native = cygwin.cygpath(target_native, 'w')
-            if datafile_cmd != 'script':
-                datafile = cygwin.cygpath(datafile, 'w')
-
         launchscript = ""
         if (datafile_cmd != 'script'):
             launchscript = "load "

src/sage/plot/plot3d/base.pyx

@@ -285,13 +285,8 @@ cdef class Graphics3d(SageObject):
             tachyon.png.save_as(preview_png)
         else:
             # Java needs absolute paths
-            # On cygwin, they should be native ones
             scene_native = scene_zip
 
-            if sys.platform == 'cygwin':
-                import cygwin
-                scene_native = cygwin.cygpath(scene_native, 'w')
-
             script = '''set defaultdirectory "{0}"\nscript SCRIPT\n'''.format(scene_native)
             jdata.export_image(targetfile=preview_png, datafile=script,
                                image_type="PNG",

src/sage/repl/rich_output/backend_ipython.py

@@ -419,13 +419,6 @@ def threejs_offline_scripts(self):
 
         script = os.path.join(THREEJS_DIR, '{}/three.min.js'.format(_required_threejs_version()))
 
-        if sys.platform == 'cygwin':
-            import cygwin
-
-            def normpath(p):
-                return 'file:///' + cygwin.cygpath(p, 'w').replace('\\', '/')
-            script = normpath(script)
-
         return '\n<script src="{0}"></script>'.format(script)