fish: add nix-env plugin

fish/conf.d/nix.fish

@@ -1,21 +0,0 @@
-# Nix package manager
-#
-# If Nix is installed:
-#  - source the profile with bash
-#  - export the NIX_* variables in fish
-#  - add Nix profile to PATH
-#
-# There is no fish profile to source yet.
-# https://github.com/NixOS/nix/issues/1512
-if test -f ~/.nix-profile/etc/profile.d/nix.sh
-    for line in (bash -c 'source $0; for name in "${!NIX_@}"; do printf "%s=%s\n" "$name" "${!name}"; done' ~/.nix-profile/etc/profile.d/nix.sh)
-        set -gx (string split -m 1 = $line)
-    end
-    if functions -q fish_add_path
-        fish_add_path -gP ~/.nix-profile/bin
-    else
-        if not contains -- ~/.nix-profile/bin $PATH
-            set PATH ~/.nix-profile/bin $PATH 2>/dev/null
-        end
-    end
-end

fish/fish_plugins

@@ -2,5 +2,6 @@ jorgebucaran/fisher
 jorgebucaran/replay.fish
 oakninja/MakeMeFish
 laughedelic/fish_logo
+lilyball/nix-env.fish
 jethrokuan/z
 reitzig/sdkman-for-fish@v1.4.0

install/install-nix-packages.sh

@@ -3,12 +3,20 @@
 echo "***** INSTALL NIX PACKAGES *****"
 
 ROOTDIR=$(cd "$(dirname "$0")/.." && pwd)
-NIX_ENV="$HOME/.nix-profile/bin/nix-env"
 
-if [ -x "$NIX_ENV" ]; then
+found_nix_command=0
-	"$NIX_ENV" --install --remove-all --file "$ROOTDIR/nix/packages.nix"
+
-else
+for profile in "$HOME/.nix-profile" "/nix/var/nix/profiles/default"
-	echo "Cannot install Nix packages! $NIX_ENV is not executable."
+do
+	if test -x "$profile/bin/nix-env"; then
+		"$profile/bin/nix-env" --install --remove-all --file "$ROOTDIR/nix/packages.nix"
+		found_nix_command=1
+		break
+	fi
+done
+
+if test $found_nix_command -ne 1; then
+	echo "Cannot install Nix packages! Command not found: nix-env"
 fi
 
 echo

install/install-nix.sh

@@ -5,7 +5,7 @@ echo "***** INSTALL NIX *****"
 if [ -d /nix ]; then
 	echo "Nix is already installed."
 else
-	/bin/bash -c "$(curl -fsSL https://nixos.org/nix/install) --no-daemon"
+	curl -fsSL https://nixos.org/nix/install | sh
 fi
 
 echo