From 8f8ebe68e0ffcfdf2c718fd7f70c7a0234b316fa Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Thu, 3 Sep 2020 00:03:02 +0000
Subject: [PATCH] Allow for multi-host configuration.

---
 blog/builder.sh  | 16 +++++++++-----
 blog/default.nix | 54 +++++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 58 insertions(+), 12 deletions(-)

diff --git a/blog/builder.sh b/blog/builder.sh
index c76fe1d..a2054f2 100644
--- a/blog/builder.sh
+++ b/blog/builder.sh
@@ -1,12 +1,18 @@
 source $stdenv/setup
 
-# Build site with Hugo
+# Copy files to a mutable directory.
 cp -r $src/* .
-hugo --baseUrl="https://danilafe.com"
 
-# Render math in HTML and XML files.
-find public/ -regex "public/.*\.html" | xargs ruby $converter
+# Hugo can't set baseUrl via CLI for multi-lingual hosts.
+# We have to manually edit the configuration.
+sed -i "$urlSub" config.toml
+
+# Build site with Hugo
+hugo $extraFlags
 
 # Output result
 mkdir $out
-cp -r public/* $out/
+cp -r public/$publicPath/* $out/
+
+# Render math in HTML and XML files.
+find $out/ -regex "$out/.*\.html" | xargs ruby $converter
diff --git a/blog/default.nix b/blog/default.nix
index 70951a4..b6b95e8 100644
--- a/blog/default.nix
+++ b/blog/default.nix
@@ -1,18 +1,58 @@
-{ stdenv, hugo, fetchgit, pkgs, nodejs, ruby }:
+{ stdenv, lib, hugo, fetchgit, pkgs, nodejs, ruby }:
 
 let
     url = "https://dev.danilafe.com/Web-Projects/blog-static.git";
-    rev = "3f0df8ae0ddbed1a2a258878e73861b96e4122b0";
-    sha256 = "16xg4d4wkpdc0qynh6jkl6np6x88bdv0aqpkgg4phjq9007nxgjp";
     requiredPackages = import ./required-packages.nix { inherit pkgs nodejs; };
-in
-    stdenv.mkDerivation {
+    website = settings: stdenv.mkDerivation {
         name = "blog-static";
-        version = rev;
+        version = settings.rev;
         src = fetchgit {
-            inherit url rev sha256;
+            inherit url;
+            inherit (settings) rev sha256;
         };
+        urlSub =
+            let
+                regexEscape = lib.escape [ "/" "(" ")" "[" "]" "+" "*" "\\" ];
+            in
+                if (settings ? replaceUrl)
+                then (with settings.replaceUrl; "s/${regexEscape from}/${regexEscape to}/g")
+		else "";
+        publicPath = settings.path;
+        extraFlags = if settings.drafts then " -D " else "";
         builder = ./builder.sh;
         converter = ./convert.rb;
         buildInputs = [ hugo requiredPackages.katex (ruby.withPackages (ps: [ ps.nokogiri ])) ];
+    };
+    rev = "b921ddfc8de1282cc82a0d90b2927bf2a5c0ee68";
+    sha256 = "1gg7dq9y1hg14qjlj2w1rn0xjgqw58s8kpd5x6c0wfpwszcm87ji";
+    localizationRev = "cd574b43fdddf8b6777610f94897d70697533af9";
+    localizationSha256 = "1lv65bllrc605lda5gqgpk4ihhg77qgh1zg60swsllmhh5vawgbn";
+in
+    {
+        english = website {
+	    inherit rev sha256;
+	    path = ".";
+	    drafts = false;
+        };
+	drafts = {
+            english = website {
+	        inherit rev sha256;
+                path = ".";
+                drafts = true;
+                replaceUrl = {
+                    from = "https://danilafe.com";
+                    to = "http://drafts.danilafe.com";
+		}; 
+            };
+	    russian = website {
+		rev = localizationRev;	
+		sha256 = localizationSha256;
+		path = "ru";
+                drafts = true;
+                replaceUrl = {
+                    from = "https://ru.danilafe.com";
+                    to = "http://drafts.ru.danilafe.com";
+		}; 
+	    };
+	};
     }