Improve MIME defaults and Home Manager backups

nixos/desktop.nix

@@ -1,4 +1,11 @@
-{ inputs, config, pkgs, lib, makeEnable, ... }:
+{
+  inputs,
+  config,
+  pkgs,
+  lib,
+  makeEnable,
+  ...
+}:
 makeEnable config "myModules.desktop" true {
   services.greenclip.enable = true;
   imports = [
@@ -72,7 +79,8 @@ makeEnable config "myModules.desktop" true {
     }
   ];
 
-  environment.systemPackages = with pkgs; [
+  environment.systemPackages = with pkgs;
+    [
       # Appearance
       adwaita-icon-theme
       hicolor-icon-theme
@@ -100,12 +108,14 @@ makeEnable config "myModules.desktop" true {
       kdePackages.dolphin
 
       feh
+      file-roller
       gthumb
       firefox
       cheese
       kdePackages.kleopatra
       libnotify
       libreoffice
+      loupe
       lxappearance
       lxqt.lxqt-powermanagement
       networkmanagerapplet
@@ -137,7 +147,11 @@ makeEnable config "myModules.desktop" true {
       # Visualization
       graphviz
       mermaid-cli
-  ] ++ (if pkgs.stdenv.hostPlatform.system == "x86_64-linux" then with pkgs; [
+    ]
+    ++ (
+      if pkgs.stdenv.hostPlatform.system == "x86_64-linux"
+      then
+        with pkgs; [
           google-chrome
           pommed_light
           slack
@@ -146,5 +160,7 @@ makeEnable config "myModules.desktop" true {
           tor-browser
           vscode
           zulip
-  ] else []);
+        ]
+      else []
+    );
 }

nixos/home-manager.nix

@@ -1,5 +1,12 @@
-{ config, pkgs, lib, nixos, ... }:
 {
+  config,
+  pkgs,
+  lib,
+  nixos,
+  ...
+}: let
+  mimeMap = desktopId: mimeTypes: lib.genAttrs mimeTypes (_: [desktopId]);
+in {
   # Automatic garbage collection of old home-manager generations
   nix.gc = {
     automatic = true;
@@ -20,37 +27,147 @@
       static_history = []
   '';
 
-  xdg.mimeApps = lib.mkIf nixos.config.myModules.desktop.enable {
+  xdg.mimeApps = lib.mkIf nixos.config.myModules.desktop.enable (
+    let
+      browser = "google-chrome.desktop";
+      imageViewer = "org.gnome.Loupe.desktop";
+      fallbackImageViewer = "okularApplication_kimgio.desktop";
+      pdfViewer = "okularApplication_pdf.desktop";
+      comicViewer = "okularApplication_comicbook.desktop";
+      djvuViewer = "okularApplication_djvu.desktop";
+      ebookViewer = "okularApplication_epub.desktop";
+      mobiViewer = "okularApplication_mobi.desktop";
+      xpsViewer = "okularApplication_xps.desktop";
+      mediaPlayer = "vlc.desktop";
+      archiveManager = "org.gnome.FileRoller.desktop";
+      fileManager = "thunar.desktop";
+      wordProcessor = "writer.desktop";
+      spreadsheet = "calc.desktop";
+      presentation = "impress.desktop";
+
+      defaultApplications =
+        (mimeMap imageViewer [
+          "image/avif"
+          "image/bmp"
+          "image/gif"
+          "image/heic"
+          "image/jpeg"
+          "image/jxl"
+          "image/png"
+          "image/svg+xml"
+          "image/svg+xml-compressed"
+          "image/tiff"
+          "image/vnd.microsoft.icon"
+          "image/webp"
+        ])
+        // (mimeMap fallbackImageViewer [
+          "image/heif"
+        ])
+        // (mimeMap pdfViewer [
+          "application/pdf"
+          "application/x-bzpdf"
+          "application/x-gzpdf"
+        ])
+        // (mimeMap comicViewer [
+          "application/x-cb7"
+          "application/x-cbr"
+          "application/x-cbt"
+          "application/x-cbz"
+        ])
+        // (mimeMap djvuViewer [
+          "image/vnd.djvu"
+        ])
+        // (mimeMap ebookViewer [
+          "application/epub+zip"
+        ])
+        // (mimeMap mobiViewer [
+          "application/x-mobipocket-ebook"
+        ])
+        // (mimeMap xpsViewer [
+          "application/oxps"
+          "application/vnd.ms-xpsdocument"
+        ])
+        // (mimeMap mediaPlayer [
+          "application/ogg"
+          "audio/flac"
+          "audio/mp4"
+          "audio/mpeg"
+          "audio/ogg"
+          "audio/opus"
+          "audio/webm"
+          "audio/wav"
+          "audio/x-flac"
+          "audio/x-wav"
+          "video/mp4"
+          "video/ogg"
+          "video/quicktime"
+          "video/webm"
+          "video/x-matroska"
+          "video/x-msvideo"
+        ])
+        // (mimeMap archiveManager [
+          "application/bzip2"
+          "application/gzip"
+          "application/vnd.rar"
+          "application/x-7z-compressed"
+          "application/x-bzip"
+          "application/x-compressed-tar"
+          "application/x-gzip"
+          "application/x-rar"
+          "application/x-rar-compressed"
+          "application/x-tar"
+          "application/x-xz"
+          "application/x-zip-compressed"
+          "application/zip"
+          "application/zstd"
+        ])
+        // (mimeMap wordProcessor [
+          "application/msword"
+          "application/rtf"
+          "application/vnd.ms-word"
+          "application/vnd.oasis.opendocument.text"
+          "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
+        ])
+        // (mimeMap spreadsheet [
+          "application/vnd.ms-excel"
+          "application/vnd.oasis.opendocument.spreadsheet"
+          "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
+          "text/csv"
+          "text/tab-separated-values"
+        ])
+        // (mimeMap presentation [
+          "application/mspowerpoint"
+          "application/vnd.ms-powerpoint"
+          "application/vnd.oasis.opendocument.presentation"
+          "application/vnd.openxmlformats-officedocument.presentationml.presentation"
+          "application/vnd.openxmlformats-officedocument.presentationml.slideshow"
+        ])
+        // (mimeMap fileManager [
+          "inode/directory"
+        ])
+        // (mimeMap browser [
+          "application/rdf+xml"
+          "application/rss+xml"
+          "application/xhtml+xml"
+          "application/xhtml_xml"
+          "application/xml"
+          "text/html"
+          "text/xml"
+          "x-scheme-handler/about"
+          "x-scheme-handler/http"
+          "x-scheme-handler/https"
+          "x-scheme-handler/unknown"
+        ])
+        // {
+          "x-scheme-handler/element" = ["element-desktop.desktop"];
+          "x-scheme-handler/magnet" = ["transmission-gtk.desktop"];
+        };
+    in {
       enable = true;
-
+      associations.added = defaultApplications;
-    associations.added = {
+      inherit defaultApplications;
-      "video/x-matroska" = "vlc.desktop";
+    }
-      "audio/flac" = "vlc.desktop";
+  );
-      "image/jpeg" = "feh.desktop";
-      "video/x-msvideo" = "vlc.desktop";
-      "text/vnd.trolltech.linguist" = "vlc.desktop";
-      "audio/mpeg" = "vlc.desktop";
-      "application/pdf" = "okularApplication_pdf.desktop";
-      "image/png" = "okularApplication_kimgio.desktop";
-      "video/mp4" = [ "vlc.desktop" "org.gnome.Totem.desktop" ];
-      "x-scheme-handler/magnet" = "userapp-transmission-gtk-24GQLZ.desktop";
-      "element" = "element-desktop.desktop";
-    };
-
-    defaultApplications = {
-      "text/html" = "google-chrome.desktop";
-      "x-scheme-handler/http" = "google-chrome.desktop";
-      "x-scheme-handler/https" = "google-chrome.desktop";
-      "x-scheme-handler/about" = "google-chrome.desktop";
-      "x-scheme-handler/unknown" = "google-chrome.desktop";
-      "x-scheme-handler/magnet" = "userapp-transmission-gtk-24GQLZ.desktop";
-      "x-scheme-handler/element" = "element-desktop.desktop";
-    };
-
-    defaultApplicationPackages = [
-      pkgs.gthumb
-    ];
-  };
 
   xsession = {
     enable = true;

nixos/nix.nix

@@ -1,5 +1,12 @@
-{ inputs, specialArgs, config, lib, realUsers, ... }:
 {
+  inputs,
+  specialArgs,
+  config,
+  lib,
+  pkgs,
+  realUsers,
+  ...
+}: {
   imports = [
     inputs.home-manager.nixosModules.home-manager
   ];
@@ -19,6 +26,29 @@
     };
     home-manager.useGlobalPkgs = true;
     home-manager.useUserPackages = true;
+    home-manager.backupCommand = pkgs.writeShellScript "home-manager-backup-command" ''
+      set -eu
+
+      target_path="$1"
+      backup_ext="''${HOME_MANAGER_BACKUP_EXT:-hm-backup}"
+      backup_path="''${target_path}.''${backup_ext}"
+
+      if [[ ! -e "$backup_path" ]]; then
+        mv -- "$target_path" "$backup_path"
+        exit 0
+      fi
+
+      timestamp="$(date +%Y%m%d-%H%M%S)"
+      candidate="''${backup_path}.''${timestamp}"
+      counter=0
+
+      while [[ -e "$candidate" ]]; do
+        counter=$((counter + 1))
+        candidate="''${backup_path}.''${timestamp}-''${counter}"
+      done
+
+      mv -- "$target_path" "$candidate"
+    '';
     home-manager.backupFileExtension = "hm-backup";
     home-manager.sharedModules = [./home-manager.nix];
 
@@ -55,7 +85,8 @@
       ];
     };
 
-    nixpkgs.overlays = [
+    nixpkgs.overlays =
+      [
         # (import ./nvidia-container-toolkit-overlay.nix)
         (import ./runc-overlay.nix)
         (import ./emacs-overlay.nix)
@@ -66,7 +97,8 @@
           claude-code = inputs.claude-code-nix.packages.${prev.stdenv.hostPlatform.system}.default;
           git-sync-rs = let
             base = inputs.git-sync-rs.packages.${prev.stdenv.hostPlatform.system}.default;
-        in prev.symlinkJoin {
+          in
+            prev.symlinkJoin {
               name = "${base.name}-wrapped";
               paths = [base];
               postBuild = ''
@@ -75,7 +107,12 @@
               '';
             };
         })
-    ] ++ (if config.imalison.nixOverlay.enable then [ inputs.nix.overlays.default ] else []);
+      ]
+      ++ (
+        if config.imalison.nixOverlay.enable
+        then [inputs.nix.overlays.default]
+        else []
+      );
 
     # Allow all the things
     nixpkgs.config.allowUnfree = true;