Alexander
78 lines
2.6 KiB
Bash
78 lines
2.6 KiB
Bash
# shellcheck shell=bash
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# theme-switch — activate a pre-built Home Manager specialisation.
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#
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# Expects two variables to be injected by the Nix wrapper:
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# baseVariant the variant that is the generation itself (not a
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# specialisation), activated via `$gen/activate`.
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# availableVariants space-separated list of all variant names (help text).
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#
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# Standalone usage for testing:
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# baseVariant=gruvbox-dark \
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# availableVariants="gruvbox-dark gruvbox-light catppuccin-dark catppuccin-light" \
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# bash theme-switch.sh <variant>
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: "${baseVariant:?theme-switch: baseVariant not set}"
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: "${availableVariants:?theme-switch: availableVariants not set}"
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set -euo pipefail
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variant="${1:-}"
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if [ -z "$variant" ]; then
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echo "Usage: theme-switch <variant>"
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echo "Available: ${availableVariants}"
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exit 1
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fi
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# Resolve the Home Manager *base* generation — the one built by NixOS that
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# actually contains the `specialisation/` directory holding every variant's
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# activation script.
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#
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# IMPORTANT: do NOT use `current-home` / the HM profile as the primary
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# source. Activating a specialisation repoints those to the specialisation's
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# *leaf* generation, which has no `specialisation/` of its own — so after
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# switching once, every other variant (and the base) would become unfindable.
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# The NixOS-managed `home-manager-«user».service` unit references the base
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# generation and only changes on a rebuild.
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user="${USER:-$(id -un)}"
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gen=""
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if unit="$(systemctl cat "home-manager-${user}.service" 2>/dev/null)"; then
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gen="$(printf '%s\n' "$unit" | grep -oE '/nix/store/[0-9a-z]+-home-manager-generation' | head -n1)"
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fi
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# Fallbacks for standalone Home Manager, where the profile symlink / gcroot
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# points at the base generation (not a specialisation leaf).
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for candidate in \
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"${HOME}/.local/state/home-manager/gcroots/current-home" \
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"/nix/var/nix/profiles/per-user/${user}/home-manager" \
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"${HOME}/.local/state/home-manager/home-manager-generation"
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do
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[ -n "$gen" ] && break
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if [ -e "$candidate" ]; then
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gen="$(readlink -e "$candidate")" || gen=""
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fi
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done
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if [ -z "$gen" ]; then
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echo "error: could not resolve Home Manager base generation" >&2
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exit 1
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fi
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case "$variant" in
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"${baseVariant}")
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# Base variant is the generation itself, not a specialisation.
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activate="$gen/activate"
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;;
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*)
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activate="$gen/specialisation/$variant/activate"
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;;
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esac
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if [ ! -x "$activate" ]; then
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echo "error: variant '$variant' not found at $activate" >&2
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echo "Available: ${availableVariants}"
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exit 1
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fi
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echo "Switching theme to $variant..."
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exec "$activate"
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