git: add clean-deleted-remotes command

scripts/default.nix

@@ -125,6 +125,12 @@
       zbar
       wl-clipboard
     ];
+    git_clean_remote_deleted = [
+      git
+      gnugrep
+      gawk
+      findutils
+    ];
     pint-fmt = [ ];
     powerplay-led-idle = [
       bash

scripts/git_clean_remote_deleted

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+git branch -vv \
+| grep ': gone]' \
+| awk '{print $1}' \
+| xargs git branch -D

user/git.nix

@@ -36,8 +36,13 @@ in
         alias = {
           graph = "log --graph --oneline --branches";
           root = "rev-parse --show-toplevel";
+          clean-deleted-remotes = "!" + (lib.getExe pkgs.git_clean_remote_deleted);
         };
       };
     };
+
+    home.packages = with pkgs; [
+      git_clean_remote_deleted
+    ];
   };
 }