display package icons installed by nix

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+---
+title: "Display Package Icons Installed by Nix in Launcher"
+date: 2022-08-24T10:20:51+05:30
+lastmod: 2022-08-24T10:20:51+05:30
+draft: false 
+keywords: [nix icons]
+description: ""
+tags: [nix]
+categories: [linux]
+author: ""
+
+# You can also close(false) or open(true) something for this content.
+# P.S. comment can only be closed
+comment: false
+toc: false
+autoCollapseToc: false
+postMetaInFooter: false
+hiddenFromHomePage: false
+# You can also define another contentCopyright. e.g. contentCopyright: "This is another copyright."
+contentCopyright: false
+reward: false
+mathjax: false
+mathjaxEnableSingleDollar: false
+mathjaxEnableAutoNumber: false
+
+# You unlisted posts you might want not want the header or footer to show
+hideHeaderAndFooter: false
+
+# You can enable or disable out-of-date content warning for individual post.
+# Comment this out to use the global config.
+#enableOutdatedInfoWarning: false
+
+flowchartDiagrams:
+  enable: false
+  options: ""
+
+sequenceDiagrams: 
+  enable: false
+  options: ""
+
+---
+Of course the icon is displayed only if the package ships a `.desktop` file.
+<!--more-->
+
+
+I have tested this on KDE Plasma. It should work on other desktop environments too. It is not implementation specific.
+
+Run the following manually or put it in your `~/.bashrc`
+```bash
+export XDG_DATA_DIRS=~/.local/share/:~/.nix-profile/share:/usr/share
+ln -s ~/.nix-profile/share/applications/*.desktop ~/.local/share/applications/
+```
+
+Now log out and log back in. Or if you are on KDE Plasma, you can run `kbuildsycoca4` to rebuild the application launcher.