[ADD] Add basic support for custom styles in LaTeX

I still need to fix that syncing issue.

callbacks.py

@@ -1,21 +1,21 @@
 from nio import *
 
-import utils
 
+latex_regex = r'((?:\$[^\$]+\$)|(?:\$\$[^\$]+\$\$)|(?:\\\[[^\]]+\\\]))'
 
 # Our message callback. It should be passed through a router.
 async def msg_cb(room: MatrixRoom, event: RoomMessageText) -> None:
-    import re
     import latex
+    import utils
+    import re
+
     client = utils.get_client()
     if event.sender == client.user_id:
         return
-    print("ae", client)
 
-    for tex in re.findall(r'((?:\$[^\$]+\$)|(?:\$\$[^\$]+\$\$)|(?:\\\[[^\]]+\\\]))', event.body, re.M):
+    for tex in re.findall(latex_regex, event.body, re.M):
-        print("Text:", tex)
         try:
-            filename = latex.render("", tex)
+            filename = latex.render(event.sender, tex)
             await utils.send_png(room, filename)
         except FileNotFoundError as e:
             content = {
@@ -35,5 +35,20 @@ async def msg_cb(room: MatrixRoom, event: RoomMessageText) -> None:
 
 # Our file callback.
 async def file_cb(room: MatrixRoom, event: RoomMessageFile) -> None:
+    import utils
+    import os
+
     url = event.url
     filename = event.body
+
+    if filename.endswith(".sty"):
+        # Download file and save it for user.
+        client = utils.get_client()
+        directory = utils.create_user_dir(event.sender)
+        response = await client.download(url, filename)
+        
+        if not isinstance(response, DownloadResponse):
+            return
+
+        with open(os.path.join(directory, filename), 'wb') as f:
+            f.write(response.body)

latex.py

@@ -1,10 +1,12 @@
 # Converts a TeX file into a PNG/SVG file.
 template = r"""
-\documentclass[utf8,preview]{{standalone}}
+\documentclass[utf8,preview,varwidth]{{standalone}}
     \usepackage{{amsmath}}
-    \usepackage[active,tightpage]{{preview}}
+    \usepackage[active]{{preview}}
     \usepackage[utf8]{{inputenc}}
+    \usepackage{{tikz}}
     % TODO: Add user packages here.
+    {packages}
 \begin{{document}}
     % The user content goes here.
     {content}
@@ -16,13 +18,25 @@ template = r"""
 def render(user: str, source: str, png: bool = True) -> str:
     import tempfile
     import subprocess
+    import utils
+    import os
+    
+    # Put the user's packages in the format too.
+    directory = utils.create_user_dir(user)
+    pkgs = ""
 
-    fmt = template.format(content=source)
+    for f in os.listdir(directory):
+        if f.endswith(".sty"):
+            base = os.path.join(directory, f[:-4])
+            pkgs += "\\usepackage{{{base}}}\n    ".format(base=base)
+    print(pkgs)
+
+    fmt = template.format(content=source, packages=pkgs)
 
     tmp = tempfile.NamedTemporaryFile(delete=False)
     tmp.write(bytes(fmt, encoding="utf8"))
     tmp.close()
-    print(tmp.name)
+
     # Parse our templated file thru' LaTeX and dvipng.
     # TODO: Allow arbitrary DPI and foreground color.
     ret = subprocess.run(["latex", "-halt-on-error", tmp.name], cwd="/tmp", capture_output=True)
@@ -30,8 +44,7 @@ def render(user: str, source: str, png: bool = True) -> str:
         raise FileNotFoundError(ret.stdout.decode())
 
     if png:
-        print("PNG")
+        subprocess.run(["dvipng", "-D", "5000", tmp.name + ".dvi", "-bg", "Transparent",
-        subprocess.run(["dvipng", "-D", "2000", tmp.name + ".dvi", "-bg", "Transparent",
                        "-fg", "rgb 1 1 1", "-o", tmp.name + ".png"], cwd="/tmp")
 
         return tmp.name + ".png"

main.py

@@ -18,7 +18,8 @@ async def main() -> None:
         homeserver = str(config["homeserver"])
         user = str(config["user"])
         token = str(config["token"])
-        # path = str(config["path"]) # not used
+        path = str(config["data"]) # Unused there, required.
+        utils.set_config(config)
         # if config file does not exist, quit
     except FileNotFoundError:
         print("No config file found.")
@@ -32,8 +33,8 @@ async def main() -> None:
     client.access_token = token
     client.user_id = user
 
-    # Bad kludge!
+    # TODO: Fix this hot mess before merging onto main.
-    await client.sync(timeout=3000)
+    client.sync(timeout=10000)
 
     # Register all of the callbacks
     utils.set_client(client)

utils.py

@@ -1,12 +1,41 @@
 from nio import *
 
+
 def set_client(c: AsyncClient) -> None:
     global client
     client = c
 
+
 def get_client() -> AsyncClient:
     return client
 
+
+def set_config(c: dict) -> None:
+    global config
+    config = c
+
+
+def get_config() -> dict:
+    return config
+
+def create_user_dir(user: str) -> str:
+    import hashlib
+    import os
+
+    # NOTE: I would have used the user directly, but the Spec allows MXIDs
+    # with '/' and UNIX-based OSes will **not** like that.
+    sha = hashlib.sha256(bytes(user, 'ascii')).hexdigest()
+
+    path = os.path.join(get_config()["data"], sha)
+    if not os.path.exists(path):
+        os.makedirs(path)
+
+    return os.path.abspath(path)
+
+
+
+
+
 async def send_png(room: MatrixRoom, filename: str) -> None:
     import imagesize
     import os