From ba456a9b8b1e92b94176a48c7eda83cc4925a77a Mon Sep 17 00:00:00 2001
From: Folkert Kevelam <contact@pyllr.nl>
Date: Fri, 12 Sep 2025 17:21:54 +0200
Subject: [PATCH] Add tikz pipeline

---
 Server/MarkdownPreviewer/tikz.py | 114 +++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 Server/MarkdownPreviewer/tikz.py

diff --git a/Server/MarkdownPreviewer/tikz.py b/Server/MarkdownPreviewer/tikz.py
new file mode 100644
index 0000000..16a42d2
--- /dev/null
+++ b/Server/MarkdownPreviewer/tikz.py
@@ -0,0 +1,114 @@
+from .render_pipeline import CallbackClass
+from .pandoc import Attr, Image, Plain
+import hashlib
+import subprocess
+import tempfile
+import os
+import re
+from pathlib import Path
+
+class Tikz(CallbackClass):
+    def __init__(self, base_path):
+        self.data_path = base_path + "/data/tikz/"
+        self.script_path = base_path + "/scripts/tex/tex2svg.sh"
+        self.image_cache = dict()
+
+    def run(self, output_dir, input_dir, name):
+        return subprocess.run(
+                [self.script_path, output_dir, input_dir, name],
+                text=True,
+                capture_output=True)
+
+    def __call__(self, content):
+        hashinput = re.sub(r"\s+", "", content['c'][1], flags=re.UNICODE).encode("utf-8")
+        hash = hashlib.md5()
+        hash.update(hashinput)
+
+        digest = hash.hexdigest()
+
+        if digest in self.image_cache:
+            return self.image_cache[digest]
+
+        preamble = """\\documentclass[class=minimal,crop=true,out=\\jobname.svg]{standalone}
+        \\usepackage{tikz}
+        \\begin{document}
+        \\begin{tikzpicture}[scale=2]"""
+
+        postamble = """\\end{tikzpicture}
+        \\end{document}"""
+
+        handle, file_path = tempfile.mkstemp(suffix=".tex", text=True)
+        text = content['c'][1]
+
+        with os.fdopen(handle, 'w') as f:
+            f.write(preamble)
+            f.write("\n")
+            f.write(text)
+            f.write("\n")
+            f.write(postamble)
+
+        stem = Path(file_path).stem
+
+        data = self.run("/tmp", "/tmp", stem)
+
+        img_attr = Attr("")
+
+        new_content = Image(img_attr, [{'t' : 'Str', 'c' : 'Tikz'}], "/generated/{}.svg".format(stem)).toJson()
+        wrapper = Plain(new_content).toJson()
+
+        self.image_cache[digest] = wrapper
+
+        return wrapper
+
+class Circuitikz(CallbackClass):
+    def __init__(self, base_path):
+        self.data_path = base_path + "/data/tikz/"
+        self.script_path = base_path + "/scripts/tex/tex2svg.sh"
+        self.image_cache = dict()
+
+    def run(self, output_dir, input_dir, name):
+        return subprocess.run(
+                [self.script_path, output_dir, input_dir, name],
+                text=True,
+                capture_output=True)
+
+    def __call__(self, content):
+        hashinput = re.sub(r"\s+", "", content['c'][1], flags=re.UNICODE).encode("utf-8")
+        hash = hashlib.md5()
+        hash.update(hashinput)
+
+        digest = hash.hexdigest()
+
+        if digest in self.image_cache:
+            return self.image_cache[digest]
+
+        preamble = """\\documentclass[class=minimal,crop=true,out=\\jobname.svg]{standalone}
+        \\usepackage{circuitikz}
+        \\begin{document}
+        \\begin{circuitikz}[scale=2, transform shape, line width=1pt]"""
+
+        postamble = """\\end{circuitikz}
+        \\end{document}"""
+
+        handle, file_path = tempfile.mkstemp(suffix=".tex", text=True)
+        text = content['c'][1]
+
+        with os.fdopen(handle, 'w') as f:
+            f.write(preamble)
+            f.write("\n")
+            f.write(text)
+            f.write("\n")
+            f.write(postamble)
+
+        stem = Path(file_path).stem
+
+        data = self.run("/tmp", "/tmp", stem)
+
+        img_attr = Attr("")
+
+        new_content = Image(img_attr, [{'t' : 'Str', 'c' : 'Circuitikz'}], "/generated/{}.svg".format(stem)).toJson()
+        wrapper = Plain(new_content).toJson()
+
+        self.image_cache[digest] = wrapper
+
+        return wrapper