Split hooks into separate files to reduce compiled size

lib/opt_hook_color.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+# -----------------------------------------------------------------------------
+# bat-extras | Copyright (C) 2019 eth-p | MIT License
+#
+# Repository: https://github.com/eth-p/bat-extras
+# Issues:     https://github.com/eth-p/bat-extras/issues
+# -----------------------------------------------------------------------------
+
+# Option parser hook: color support.
+# This will accept --no-color or --color.
+# It will also try to accept --color=never|always|auto.
+#
+# The variable OPT_COLOR will be set depending on whether or not a TTY is
+# detected and whether or not --color/--no-color is specified.
+hook_color() {
+	SHIFTOPT_HOOKS+=("__shiftopt_hook__color")
+	__shiftopt_hook__color() {
+		case "$OPT" in
+
+		--no-color) OPT_COLOR=false ;;
+		--color) {
+			case "$OPT_VAL" in
+			"")            OPT_COLOR=true ;;
+			always | true) OPT_COLOR=true  ;;
+			never | false) OPT_COLOR=false ;;
+			auto) return 0 ;;
+			*)
+				printc "%{RED}%s: '--color' expects value of 'auto', 'always', or 'never'%{CLEAR}\n" "$PROGRAM"
+				exit 1
+				;;
+			esac
+		} ;;
+
+		*) return 1 ;;
+		esac
+
+		printc_init "$OPT_COLOR"
+		return 0
+	}
+
+	# Default color support.
+	if [[ -z "$OPT_COLOR" ]]; then
+		if [[ -t 1 ]]; then
+			OPT_COLOR=true
+		else
+			OPT_COLOR=false
+		fi
+		printc_init "$OPT_COLOR"
+	fi
+}