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+help:
+    @just --list
+
+update HOST:
+    nix flake update
+    git add -- ./flake.lock
+    git commit -m "nix: update flake"
+    just switch "{{HOST}}"
+
+sync HOST:
+    git fetch --all
+    git stash save
+    git switch -d origin/main
+    git stash pop
+    just switch "{{HOST}}"
+
+switch HOST:
+    home-manager switch --flake ".#{{HOST}}"
+
+gc:
+    # TODO: leave the last 3 generations?
+    # home-manager remove-generations $({ home-manager generations | tail +4 && date -d '-1 month' '+%Y-%m-%d %H:%M : id DELETE ->'; } | sort -r | sed -n '/: id DELETE ->/,$p' | tail +2 | grep -o ': id [0-9]* ->' | awk '{ print $3; }')
+    home-manager expire-generations '-1 month'
+    nix profile wipe-history
+    nix store gc