Modules/Mime: Add mime module

system/modules/mime/default.nix

@@ -0,0 +1,82 @@
+{
+  config,
+  lib,
+  mylib,
+  ...
+}: let
+  inherit (config.modules) mime;
+in {
+  options.modules.mime = import ./options.nix {inherit lib mylib;};
+
+  config = lib.mkIf mime.enable {
+    xdg = {
+      # https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
+      # Find .desktop files: fd ".*\.desktop" / | grep --color=auto -E neovide
+      mime = rec {
+        enable = true;
+
+        defaultApplications = let
+          associations = {
+            ${mime.defaultTextEditor} = mime.textTypes;
+            ${mime.defaultFileBrowser} = ["inode/directory"];
+            ${mime.defaultWebBrowser} = mime.webTypes;
+            ${mime.defaultPdfViewer} = ["application/pdf"];
+            ${mime.defaultImageViewer} = mime.imageTypes;
+            ${mime.defaultAudioPlayer} = mime.audioTypes;
+            ${mime.defaultVideoPlayer} = mime.videoTypes;
+          };
+
+          # Applied to a single app and a single type
+          # Result: { "image/jpg" = ["imv.desktop"]; }
+          mkAssociation = app: type: {${type} = [app];};
+
+          # Applied to a single app and a list of types
+          # Result: { "image/jpg" = ["imv.desktop"]; "image/png" = ["imv.desktop"]; ... }
+          mkAssociations = app: types:
+            lib.mergeAttrsList
+            (builtins.map (mkAssociation app) types);
+        in
+          # Apply to a list of apps each with a list of types
+          lib.mergeAttrsList (lib.mapAttrsToList mkAssociations associations);
+
+        addedAssociations = defaultApplications;
+
+        removedAssociations = let
+          # Applied to a list of apps and a single type
+          removeAssociation = apps: type: {${type} = apps;};
+
+          # Applied to a list of apps and a list of types:
+          # For each type the list of apps should be removed
+          removeAssociations = apps: types:
+            lib.mergeAttrsList
+            (builtins.map (removeAssociation apps) types);
+
+          # Only create if more than 0 apps are specified: (len from...Types) > 0
+          mkIfExists = apps: types:
+            lib.optionalAttrs
+            (builtins.lessThan 0 (builtins.length apps))
+            (removeAssociations apps types);
+        in
+          lib.mergeAttrsList [
+            {
+              "application/pdf" = [
+                "chromium-browser.desktop"
+                "com.google.Chrome.desktop"
+                "firefox.desktop"
+              ];
+              "text/plain" = [
+                "firefox.desktop"
+                "code.desktop"
+              ];
+            }
+
+            (mkIfExists mime.removedTextTypes mime.textTypes)
+            (mkIfExists mime.removedImageTypes mime.imageTypes)
+            (mkIfExists mime.removedAudioTypes mime.audioTypes)
+            (mkIfExists mime.removedVideoTypes mime.videoTypes)
+            (mkIfExists mime.removedWebTypes mime.webTypes)
+          ];
+      };
+    };
+  };
+}