Nix: package easy-mde dependency

contrib/package/nix/deps/easy-mde/default.nix

@@ -0,0 +1,31 @@
+{fetchFromGitHub, buildNpmPackage, marked, codemirror}:
+buildNpmPackage rec {
+  pname = "easy-mde";
+  version = "2.18.0";
+
+  src = fetchFromGitHub {
+    owner = "Ionaru";
+    repo = "easy-markdown-editor";
+    tag = version;
+    hash = "sha256-g3ZjvT/gqKztyrItn+xOysOWcyQ70xCkFY+dWlK7hL8=";
+  };
+
+  npmDepsHash = "sha256-Vkyw8PisYD7XznOQjzb2S9No7Ec5tGYUImRQOJLin3M=";
+
+  env.CYPRESS_INSTALL_BINARY = "0";
+
+  patches = [
+    ./../../../../../scripts/deps-docker/easymde-ln.patch
+  ];
+  postPatch = ''
+    sed -ri 's`^var marked = require\(.marked.\).marked;$`var marked = window.marked;`' src/js/easymde.js
+  '';
+
+  preBuild = ''
+    rm -r node_modules/{codemirror,marked}
+    ln -s ${codemirror}/lib/node_modules/codemirror node_modules/codemirror
+    ln -s ${marked}/lib/node_modules/marked node_modules/marked
+  '';
+
+  npmBuildScript = "prepare";
+}

contrib/package/nix/overlay.nix

@@ -6,6 +6,7 @@ final: prev: {
   # Dependencies
   codemirror = final.callPackage ./deps/codemirror { };
   marked = final.callPackage ./deps/marked { };
+  easy-mde = final.callPackage ./deps/easy-mde { };
 
   python3 = prev.python3.override {
     packageOverrides = pyFinal: pyPrev: {