Split hooks into separate files to reduce compiled size

lib/opt_hook_pager.sh

@@ -0,0 +1,47 @@
+#!/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: pager support.
+# This will accept --pager='pager', --no-pager
+hook_pager() {
+	SHIFTOPT_HOOKS+=("__shiftopt_hook__pager")
+	__shiftopt_hook__pager() {
+		case "$OPT" in
+
+		# Specify paging.
+		--no-pager) shiftval; SCRIPT_PAGER_CMD='' ;;
+		--paging) {
+			shiftval
+
+			case "$OPT_VAL" in
+			auto)   : ;;
+			always) : ;;
+			never)  SCRIPT_PAGER_CMD='' ;;
+			*)
+				printc "%{RED}%s: '--paging' expects value of 'auto', 'always', or 'never'%{CLEAR}\n" "$PROGRAM"
+				exit 1
+				;;
+			esac
+		} ;;
+
+		# Specify the pager.
+		--pager) {
+			shiftval
+
+			# [note]: These are both intentional.
+			# shellcheck disable=SC2034 disable=SC2206
+			{
+				SCRIPT_PAGER_CMD=($OPT_VAL)
+				PAGER_ARGS=()
+			}
+		} ;;
+
+		*) return 1 ;;
+		esac
+	}
+}