Always use / when calling LaTeX (#3061)

* Add a test to reproduce #3060

* Always use `/` when calling LaTeX

Using `\` isn't supported by LaTeX and simply errors out
saying it can't find the file. In this commit, the path is
converted to POSIX like path (ie. use `/`) before calling
LaTeX.

Fixes #3060

Author: naveen521kk

manim/utils/tex_file_writing.py

@@ -129,8 +129,8 @@ def tex_compilation_command(
             "-interaction=batchmode",
             f'-output-format="{output_format[1:]}"',
             "-halt-on-error",
-            f'-output-directory="{tex_dir}"',
-            f'"{tex_file}"',
+            f'-output-directory="{tex_dir.as_posix()}"',
+            f'"{tex_file.as_posix()}"',
             ">",
             os.devnull,
         ]
@@ -146,8 +146,8 @@ def tex_compilation_command(
             outflag,
             "-interaction=batchmode",
             "-halt-on-error",
-            f'-output-directory="{tex_dir}"',
-            f'"{tex_file}"',
+            f'-output-directory="{tex_dir.as_posix()}"',
+            f'"{tex_file.as_posix()}"',
             ">",
             os.devnull,
         ]
@@ -229,10 +229,10 @@ def convert_to_svg(dvi_file: Path, extension: str, page: int = 1):
             "dvisvgm",
             "--pdf" if extension == ".pdf" else "",
             "-p " + str(page),
-            f'"{dvi_file}"',
+            f'"{dvi_file.as_posix()}"',
             "-n",
             "-v 0",
-            "-o " + f'"{result}"',
+            "-o " + f'"{result.as_posix()}"',
             ">",
             os.devnull,
         ]

tests/module/mobject/text/test_texmobject.py

@@ -33,6 +33,19 @@ def test_tex():
     assert Path(config.media_dir, "Tex", "f2e45e6e82d750e6.svg").exists()
 
 
+def test_tex_temp_directory(tmpdir, monkeypatch):
+    # Adds a test for #3060
+    # It's not possible to reproduce the issue normally, because we use
+    # tempconfig to change media directory to temporary directory by default
+    # we partially, revert that change here.
+    monkeypatch.chdir(tmpdir)
+    Path(tmpdir, "media").mkdir()
+    with tempconfig({"media_dir": "media"}):
+        Tex("The horse does not eat cucumber salad.")
+        assert Path("media", "Tex").exists()
+        assert Path("media", "Tex", "f2e45e6e82d750e6.svg").exists()
+
+
 def test_percent_char_rendering():
     Tex(r"\%")
     assert Path(config.media_dir, "Tex", "3f48edf8ebaf82c8.tex").exists()