From 0b720343053dd0f67faa53698ebe748fbeddc6b3 Mon Sep 17 00:00:00 2001
From: EuAndreh <eu@euandre.org>
Date: Thu, 25 Apr 2024 15:55:54 -0300
Subject: Revert "Remove Nix/NixOS support from configuration and utilities"

This reverts commit 3b2d27457db9ef8911893fa1b843560f1ccab2eb.
---
 bin/gc                | 21 +++++++++++++++++++++
 bin/reconfigure       |  6 ++++++
 bin/update            |  9 +++++++++
 etc/guix/system.scm   |  1 +
 etc/sh/rc             | 16 +++++++++++++++-
 opt/aux/gen-e-list.sh |  1 +
 6 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/bin/gc b/bin/gc
index 8622a7d..4634f8c 100755
--- a/bin/gc
+++ b/bin/gc
@@ -18,6 +18,7 @@ help() {
 
 		  TYPE          what to do GC on (default: all):
 		                - guix
+		                - nix
 		                - trash
 		                - tmpdir
 		                - coredump
@@ -93,6 +94,25 @@ gc_guix() {
 	fi
 }
 
+gc_nix() {
+	if [ ! -e /nix/ ]; then
+		return
+	fi
+
+	PROFILES='
+	/nix/var/nix/profiles/per-user/root/channels
+	/nix/var/nix/profiles/system
+	'
+
+	for p in $PROFILES; do
+		pass show "$(hostname)"/andreh | head -n1 |
+			sudo -iS nix-env --delete-generations old -p "$p"
+	done
+	nix-env --delete-generations old
+	nix-store --gc
+	nix-collect-garbage -d
+}
+
 gc_trash() {
 	yes | trash-empty
 }
@@ -122,6 +142,7 @@ gc_docker() {
 
 TYPES='
 guix
+nix
 trash
 tmpdir
 docker
diff --git a/bin/reconfigure b/bin/reconfigure
index 2df3ee7..14a8629 100755
--- a/bin/reconfigure
+++ b/bin/reconfigure
@@ -21,6 +21,7 @@ help() {
 		Switches the system:
 		- reconfigure the Guix "home" environment;
 		- Guix "system" if it exists;
+		- NixOS if it exists.
 
 
 		Examples:
@@ -94,6 +95,11 @@ pass show "$(hostname)"/andreh |
 	head -n1 |
 	sudo -ES guix system -v3 reconfigure "$XDG_CONFIG_HOME"/guix/system.scm
 
+if [ -e /etc/nixos/configuration.nix ]; then
+	pass show "$HOSTNAME"/andreh |
+		head -n1 |
+		sudo -S nixos-rebuild switch
+fi
 
 bins > /dev/null
 
diff --git a/bin/update b/bin/update
index dc8a84f..6e6effc 100755
--- a/bin/update
+++ b/bin/update
@@ -64,6 +64,15 @@ done
 shift $((OPTIND - 1))
 
 
+HOSTNAME="$(hostname)"
+if [ -e /etc/nixos/configuration.nix ]; then
+	pass show "$HOSTNAME"/andreh |
+		head -n1 |
+		sudo -S nix-channel --update
+else
+	nix-channel --update
+fi
+
 guix pull -v3
 rfc -u
 
diff --git a/etc/guix/system.scm b/etc/guix/system.scm
index 9157a16..5fdd436 100644
--- a/etc/guix/system.scm
+++ b/etc/guix/system.scm
@@ -143,6 +143,7 @@ Seiko Epson Color Ink Jet Printers.")
     (append
      (map (compose list specification->package+output symbol->string)
           '(nss-certs
+            nix
             cups
             ghc
             ghc-xmonad-contrib
diff --git a/etc/sh/rc b/etc/sh/rc
index fd6da27..e5fb5e9 100644
--- a/etc/sh/rc
+++ b/etc/sh/rc
@@ -297,6 +297,20 @@ guix_env() {
 	printf ')'
 }
 
+in_nix_shell() {
+	if [ -z "${IN_NIX_SHELL:-}" ]; then
+		return
+	fi
+
+	printf '\n'
+	color -c blacki '~> '
+	color -c purpleb "$IN_NIX_SHELL "
+	color -c purple 'nix-shell '
+	printf '('
+	color -c blueb "${name:-}"
+	printf ')'
+}
+
 in_ssh_session() {
 	if [ -n "${SSH_CLIENT:-}" ]; then
 		color -c blackb '\\u'
@@ -323,7 +337,7 @@ vcs_status() {
 	fi
 }
 
-PS1='`error_marker`'$(timestamp)' '$(path)'`direnv_status``makeflags_status` `shell_status``vcs_status``guix_env`
+PS1='`error_marker`'$(timestamp)' '$(path)'`direnv_status``makeflags_status` `shell_status``vcs_status``guix_env``in_nix_shell`
 '$(in_ssh_session)'$ '
 export PS1
 
diff --git a/opt/aux/gen-e-list.sh b/opt/aux/gen-e-list.sh
index d0586f1..7102e27 100755
--- a/opt/aux/gen-e-list.sh
+++ b/opt/aux/gen-e-list.sh
@@ -8,6 +8,7 @@ set -eu
 		$XDG_CONFIG_HOME/sh/rc
 		$XDG_CONFIG_HOME/guix/home.scm
 		$XDG_CONFIG_HOME/guix/system.scm
+		$XDG_CONFIG_HOME/nix/configuration.nix
 	EOF
 
 	find \
-- 
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