Add support for Wolfram Language (#1014)

docs/languages.md

@@ -30,5 +30,7 @@ Jupytext works with notebooks in any of the following languages:
 - TypeScript
 - Haskell
 - Tcl
+- Wolfram Language
+  - Note that Jupytext uses the non-standard `.wolfram` file extension for Wolfram Language files to avoid conflicts with Matlab.
 
 Extending Jupytext to more languages should be easy, see the sections on [contributing to](contributing.md) and [developing](developing.md) Jupytext.

jupytext/cell_metadata.py

@@ -256,6 +256,10 @@ def parse_rmd_options(line):
 def rmd_options_to_metadata(options, use_runtools=False):
     """Parse rmd options and return a metadata dictionary"""
     options = re.split(r"\s|,", options, 1)
+    # Special case Wolfram Language, which sadly has a space in the language
+    # name.
+    if options[0:2] == ["wolfram", "language"]:
+        options[0:2] = ["wolfram language"]
     if len(options) == 1:
         language = options[0]
         chunk_options = []

jupytext/languages.py

@@ -29,6 +29,7 @@
     "haskell",
     "tcl",
     "gnuplot",
+    "wolfram language",
 ]
 
 # Supported file extensions (and languages)
@@ -47,6 +48,14 @@
     ".ps1": {"language": "powershell", "comment": "#"},
     ".q": {"language": "q", "comment": "/"},
     ".m": {"language": "matlab", "comment": "%"},
+    # Unfortunately, Wolfram Mathematica also uses the .m extension which
+    # conflicts with Matlab. To work around this problem we arbitrarily use a
+    # made-up .wolfram extension.
+    ".wolfram": {
+        "language": "wolfram language",
+        "comment": "(*",
+        "comment_suffix": "*)",
+    },
     ".pro": {"language": "idl", "comment": ";"},
     ".js": {"language": "javascript", "comment": "//"},
     ".ts": {"language": "typescript", "comment": "//"},

tests/notebooks/mirror/ipynb_to_Rmd/wolfram.Rmd

@@ -0,0 +1,28 @@
+---
+jupyter:
+  kernelspec:
+    display_name: Wolfram Language 13.1
+    language: Wolfram Language
+    name: wolframlanguage13.1
+---
+
+**Note:** The `language_info` `file_extension` in this notebook should be `.m`, but it was deliberately changed to `.wolfram` to avoid conflicts with Matlab which is using the same extension.
+
+
+We start with...
+
+```{wolfram language}
+Print["Hello, World!"];
+```
+
+Then we draw the first example plot from the [ListPlot](https://reference.wolfram.com/language/ref/ListPlot.html) reference:
+
+```{wolfram language}
+ListPlot[Prime[Range[25]]]
+```
+
+We also test the math outputs as in the [Simplify](https://reference.wolfram.com/language/ref/Simplify.html) example:
+
+```{wolfram language}
+D[Integrate[1/(x^3 + 1), x], x]
+```

tests/notebooks/mirror/ipynb_to_hydrogen/wolfram.wolfram

@@ -0,0 +1,28 @@
+(* --- *)
+(* jupyter: *)
+(*   kernelspec: *)
+(*     display_name: Wolfram Language 13.1 *)
+(*     language: Wolfram Language *)
+(*     name: wolframlanguage13.1 *)
+(* --- *)
+
+(* %% [markdown] *)
+(* **Note:** The `language_info` `file_extension` in this notebook should be `.m`, but it was deliberately changed to `.wolfram` to avoid conflicts with Matlab which is using the same extension. *)
+
+(* %% [markdown] *)
+(* We start with... *)
+
+(* %% *)
+Print["Hello, World!"];
+
+(* %% [markdown] *)
+(* Then we draw the first example plot from the [ListPlot](https://reference.wolfram.com/language/ref/ListPlot.html) reference: *)
+
+(* %% *)
+ListPlot[Prime[Range[25]]]
+
+(* %% [markdown] *)
+(* We also test the math outputs as in the [Simplify](https://reference.wolfram.com/language/ref/Simplify.html) example: *)
+
+(* %% *)
+D[Integrate[1/(x^3 + 1), x], x]

tests/notebooks/mirror/ipynb_to_md/wolfram.md

@@ -0,0 +1,28 @@
+---
+jupyter:
+  kernelspec:
+    display_name: Wolfram Language 13.1
+    language: Wolfram Language
+    name: wolframlanguage13.1
+---
+
+**Note:** The `language_info` `file_extension` in this notebook should be `.m`, but it was deliberately changed to `.wolfram` to avoid conflicts with Matlab which is using the same extension.
+
+
+We start with...
+
+```wolfram language
+Print["Hello, World!"];
+```
+
+Then we draw the first example plot from the [ListPlot](https://reference.wolfram.com/language/ref/ListPlot.html) reference:
+
+```wolfram language
+ListPlot[Prime[Range[25]]]
+```
+
+We also test the math outputs as in the [Simplify](https://reference.wolfram.com/language/ref/Simplify.html) example:
+
+```wolfram language
+D[Integrate[1/(x^3 + 1), x], x]
+```

tests/notebooks/mirror/ipynb_to_myst/wolfram.md

@@ -0,0 +1,28 @@
+---
+kernelspec:
+  display_name: Wolfram Language 13.1
+  language: Wolfram Language
+  name: wolframlanguage13.1
+---
+
+**Note:** The `language_info` `file_extension` in this notebook should be `.m`, but it was deliberately changed to `.wolfram` to avoid conflicts with Matlab which is using the same extension.
+
++++
+
+We start with...
+
+```{code-cell} mathematica
+Print["Hello, World!"];
+```
+
+Then we draw the first example plot from the [ListPlot](https://reference.wolfram.com/language/ref/ListPlot.html) reference:
+
+```{code-cell} mathematica
+ListPlot[Prime[Range[25]]]
+```
+
+We also test the math outputs as in the [Simplify](https://reference.wolfram.com/language/ref/Simplify.html) example:
+
+```{code-cell} mathematica
+D[Integrate[1/(x^3 + 1), x], x]
+```

tests/notebooks/mirror/ipynb_to_percent/wolfram.wolfram

@@ -0,0 +1,28 @@
+(* --- *)
+(* jupyter: *)
+(*   kernelspec: *)
+(*     display_name: Wolfram Language 13.1 *)
+(*     language: Wolfram Language *)
+(*     name: wolframlanguage13.1 *)
+(* --- *)
+
+(* %% [markdown] *)
+(* **Note:** The `language_info` `file_extension` in this notebook should be `.m`, but it was deliberately changed to `.wolfram` to avoid conflicts with Matlab which is using the same extension. *)
+
+(* %% [markdown] *)
+(* We start with... *)
+
+(* %% *)
+Print["Hello, World!"];
+
+(* %% [markdown] *)
+(* Then we draw the first example plot from the [ListPlot](https://reference.wolfram.com/language/ref/ListPlot.html) reference: *)
+
+(* %% *)
+ListPlot[Prime[Range[25]]]
+
+(* %% [markdown] *)
+(* We also test the math outputs as in the [Simplify](https://reference.wolfram.com/language/ref/Simplify.html) example: *)
+
+(* %% *)
+D[Integrate[1/(x^3 + 1), x], x]

tests/notebooks/mirror/ipynb_to_script/wolfram.wolfram

@@ -0,0 +1,21 @@
+(* --- *)
+(* jupyter: *)
+(*   kernelspec: *)
+(*     display_name: Wolfram Language 13.1 *)
+(*     language: Wolfram Language *)
+(*     name: wolframlanguage13.1 *)
+(* --- *)
+
+(* **Note:** The `language_info` `file_extension` in this notebook should be `.m`, but it was deliberately changed to `.wolfram` to avoid conflicts with Matlab which is using the same extension. *)
+
+(* We start with... *)
+
+Print["Hello, World!"];
+
+(* Then we draw the first example plot from the [ListPlot](https://reference.wolfram.com/language/ref/ListPlot.html) reference: *)
+
+ListPlot[Prime[Range[25]]]
+
+(* We also test the math outputs as in the [Simplify](https://reference.wolfram.com/language/ref/Simplify.html) example: *)
+
+D[Integrate[1/(x^3 + 1), x], x]