pandocode-live: add image output

Author: nzbr

flake.nix

@@ -45,22 +45,38 @@
 
           contents = [
             pkgs.lighttpd
+            pkgs.pandoc
+            pkgs.poppler_utils
+            (pkgs.texlive.combine {
+                inherit (pkgs.texlive) scheme-basic algorithmicx xcolor standalone preview;
+            })
             (pkgs.writeShellScriptBin "python-wrapper" ''
               export PYTHONPATH=${pkgs.runCommand "pandocode-module" {} ''
                 mkdir -p $out
                 cp -r ${./.}/. $out/pandocode
               ''}
-              exec ${python}/bin/python3 "$@"
+              exec ${pkgs.python3.withPackages (pypi: with pypi; [
+                panflute
+                pdf2image
+                pillow
+              ])}/bin/python3 "$@"
             '')
             (pkgs.runCommand "content" { } ''
-              mkdir -p $out/var/www/cgi-bin
+              mkdir -p $out/var/www
               cp -vr ${pandocode-live-frontend}/. $out/var/www/
               cp -vr ${./live/cgi-bin}/. $out/var/www/cgi-bin
+              cp -vr ${./live/etc}/. $out/etc
             '')
           ];
 
+          enableFakechroot = true;
+          fakeRootCommands = ''
+            mkdir -p /root /etc /tmp
+            echo 'root:x:0:0::/root:/noshell' > /etc/passwd
+          '';
+
           config = {
-            Cmd = [ "/bin/lighttpd" "-D" "-f" "${./live/lighttpd.conf}" ];
+            Cmd = [ "/bin/lighttpd" "-D" "-f" "/etc/lighttpd.conf" ];
             Env = [ "" ];
             ExposedPorts = {
               "8080/tcp" = { };

live/cgi-bin/image.py

@@ -0,0 +1,36 @@
+# print every line back
+import subprocess
+import sys
+from io import BytesIO
+from pdf2image import convert_from_bytes
+from pandocode.codeprocessor import process_code
+
+print("Content-type: image/webp")
+print("Access-Control-Allow-Origin: *")
+print("")
+sys.stdout.flush()
+
+processed = process_code(sys.stdin.read())
+process = subprocess.run(
+    [
+        'pandoc',
+        '-f', 'markdown',
+        '-t', 'pdf',
+        '--template', '/etc/template.tex',
+        '--pdf-engine', 'pdflatex',
+        '--pdf-engine-opt', '-disable-write18',
+        '-o', '-'
+    ],
+    input=processed.encode('utf-8'),
+    stdout=subprocess.PIPE,
+)
+if process.returncode != 0:
+    exit(process.returncode)
+
+images = convert_from_bytes(process.stdout)
+image_bytes = BytesIO()
+images[0].save(image_bytes, format='WebP')
+image_bytes = image_bytes.getvalue()
+
+sys.stdout.buffer.write(image_bytes)
+sys.stdout.flush()

live/cgi-bin/latex.py

@@ -1,9 +1,10 @@
-# print every line back
 import sys
 from pandocode.codeprocessor import process_code
 
 print("Content-type: text/plain")
 print("Access-Control-Allow-Origin: *")
 print("")
+sys.stdout.flush()
 
-print(process_code(sys.stdin.read()))
+sys.stdout.write(process_code(sys.stdin.read()))
+sys.stdout.flush()

live/lighttpd.conf renamed to live/etc/lighttpd.conf

@@ -0,0 +1,5 @@
+\documentclass[preview]{standalone}
+\usepackage[noend]{algpseudocode}
+\begin{document}
+$body$
+\end{document}