Added nix-Shell support

functions/__sf_section_nix.fish

@@ -0,0 +1,32 @@
+# nix
+#
+
+function __sf_section_nix -d "Show in nix-shell indicator"
+	# ------------------------------------------------------------------------------
+	# Configuration
+	# ------------------------------------------------------------------------------
+
+	__sf_util_set_default SPACEFISH_NIX_SHOW true
+	__sf_util_set_default SPACEFISH_NIX_PREFIX $SPACEFISH_PROMPT_DEFAULT_PREFIX
+	__sf_util_set_default SPACEFISH_NIX_SUFFIX $SPACEFISH_PROMPT_DEFAULT_SUFFIX
+	__sf_util_set_default SPACEFISH_NIX_SYMBOL "🅽 "
+	__sf_util_set_default SPACEFISH_NIX_COLOR blue
+
+	# ------------------------------------------------------------------------------
+	# Section
+	# ------------------------------------------------------------------------------
+
+	# Show in-nix-shell indicator
+	[ $SPACEFISH_NIX_SHOW = false ]; and return
+
+	# Show nix-shell symbol only in a nix shell
+	if not test -n "$IN_NIX_SHELL"
+		return
+	end
+
+	__sf_lib_section \
+		$SPACEFISH_NIX_COLOR \
+		$SPACEFISH_NIX_PREFIX \
+		"$SPACEFISH_NIX_SYMBOL" \
+		$SPACEFISH_NIX_SUFFIX
+end

functions/fish_prompt.fish

@@ -13,7 +13,7 @@ function fish_prompt
 	__sf_util_set_default SPACEFISH_PROMPT_SUFFIXES_SHOW true
 	__sf_util_set_default SPACEFISH_PROMPT_DEFAULT_PREFIX "via "
 	__sf_util_set_default SPACEFISH_PROMPT_DEFAULT_SUFFIX " "
-	__sf_util_set_default SPACEFISH_PROMPT_ORDER time user dir host git package node ruby golang php rust haskell julia elixir docker aws venv conda pyenv dotnet kubecontext exec_time line_sep battery vi_mode jobs exit_code char
+	__sf_util_set_default SPACEFISH_PROMPT_ORDER time user dir host git package nix node ruby golang php rust haskell julia elixir docker aws venv conda pyenv dotnet kubecontext exec_time line_sep battery vi_mode jobs exit_code char
 
 	# ------------------------------------------------------------------------------
 	# Sections