From ea7a07c1803b84529301b1eb568a3066dfdefc9f Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sun, 23 Sep 2018 21:18:29 +0200
Subject: Add KaTeX derivation

---
 default.nix            |  2 ++
 pkgs/KaTeX/default.nix | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 pkgs/KaTeX/default.nix

diff --git a/default.nix b/default.nix
index a04c69d..ffc0ddd 100644
--- a/default.nix
+++ b/default.nix
@@ -11,6 +11,8 @@ let
     oomox-gtk-theme            = callPackage ./pkgs/oomox-gtk-theme { };
     oomox-archdroid-icon-theme = callPackage ./pkgs/oomox-archdroid-icon-theme { };
 
+    KaTeX = callPackage ./pkgs/KaTeX { };
+
     InputXSLT  = callPackage ./pkgs/xslt/InputXSLT { };
     StaticXSLT = callPackage ./pkgs/xslt/StaticXSLT { };
     BuildXSLT  = callPackage ./pkgs/xslt/BuildXSLT { };
diff --git a/pkgs/KaTeX/default.nix b/pkgs/KaTeX/default.nix
new file mode 100644
index 0000000..37fe63a
--- /dev/null
+++ b/pkgs/KaTeX/default.nix
@@ -0,0 +1,49 @@
+{ stdenv, pkgs, ... }:
+
+let
+  katex-src = stdenv.mkDerivation rec {
+    name = "katex-src";
+
+    src = pkgs.fetchzip {
+      url    = "https://github.com/Khan/KaTeX/releases/download/v0.10.0-alpha/katex.zip";
+      sha256 = "002dzyf3wcyjxv4m6vv0v99gf82a9k7rxsnlvf93h9fhcda2vj7l";
+    };
+
+    buildInputs = [ pkgs.nodejs ];
+
+    installPhase = ''
+      mkdir -p $out/share/katex
+      cp katex.min.js $out/share/katex/
+    '';
+
+    meta = {
+      description = "KaTeX";
+      homepage    = https://github.com/Khan/KaTeX;
+      license     = stdenv.lib.licenses.mit;
+      platforms   = stdenv.lib.platforms.all;
+    };
+  };
+in pkgs.writeTextFile {
+  name        = "katex-wrapper";
+  executable  = true;
+  destination = "/bin/katex";
+
+  text = ''
+    #!${pkgs.nodejs}/bin/node
+
+    var katex = require("${katex-src}/share/katex/katex.min.js");
+    var input = "";
+
+    var args = process.argv.slice(2);
+
+    process.stdin.on("data", function(chunk) {
+        input += chunk.toString();
+    });
+
+    process.stdin.on("end", function() {
+        var options = { displayMode: args.indexOf("--display-mode") !== -1 };
+        var output = katex.renderToString(input, options);
+        console.log(output);
+    });
+  '';
+}
-- 
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