feat(nix): enable flakes

This reverts commit 9c1bf37d50c481ffbbe252da7ee1cf2ed3620628.

configs/default.nix

@@ -211,6 +211,7 @@ in {
     ./mime.nix
     ./nano.nix
     ./neovim.nix
+    ./nix.nix
     ./newsboat.nix
     ./flameshot-once.nix
     ./packages

configs/hu-berlin.nix

@@ -54,6 +54,12 @@ in {
     options = hu-berlin-cifs-options;
   };
 
+  environment.systemPackages = [
+    (pkgs.writers.writeDashBin "hu-ip" ''
+      ${pkgs.w3m}/bin/w3m -dump meineip.hu-berlin.de | head --lines=-4 | tail --lines=+3
+    '')
+  ];
+
   systemd.services.hu-vpn = {
     enable = true;
     wants = [ "network-online.target" ];

configs/mime.nix

@@ -19,6 +19,7 @@
         "x-scheme-handler/mailto" = "brave-browser.desktop";
         "x-scheme-handler/unknown" = "brave-browser.desktop";
         "x-scheme-handler/webcal" = "brave-browser.desktop";
+        "inode/directory" = "pcmanfm.desktop";
       };
 
     };

configs/nix.nix

@@ -0,0 +1,10 @@
+{ pkgs, ... }:
+{
+  # enable `nix flake`
+  nix = {
+    package = pkgs.nixUnstable;
+    extraOptions = ''
+      experimental-features = nix-command flakes
+    '';
+  };
+}

configs/packages/default.nix

@@ -101,7 +101,7 @@ in {
     pdfgrep # search in pdf
     pdftk # pdf toolkit
     evince # for viewing pdf annotations
-    xournal # for annotating pdfs
+    xournalpp # for annotating pdfs
     hc # print files as qr codes
     youtubeDL
     bc # calculator

configs/packages/writing.nix

@@ -67,8 +67,8 @@ in {
     (aspellWithDicts (dict: [ dict.de dict.en dict.en-computers ]))
     haskellPackages.pandoc-citeproc
     nur.repos.kmein.text2pdf
-    abiword
-    gnumeric
+    libreoffice
+    # gnumeric
     dia
     unstable.pandoc
     # proselint

configs/wifi.nix

@@ -40,6 +40,7 @@
       "b-base".pskRaw = "44040369a63d5bce4576637e8d34aeb3ed3d178011386decb99da473418e9861";
       "c-base".pskRaw = "1355ccb287407bcd0caa4a7a399367c28b1e11bf5da34dd100d4b86ac4cafe46";
       "o2-WLAN66".pskRaw = "9fc24da5ee0c7cf73321f5efa805370c246c4121413ea4f2373c0b7e41ec65e4";
+      "Vodafone-8012".pskRaw = "45a998e3e07f83ae0b4f573535fb3ccfd808b364a22f349878ced889a6fffe2c";
     };
   };