From 412ff3c0079915822df8ea5e79acd2c0d81bbeff Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Thu, 23 Oct 2014 00:07:55 -0400
Subject: [PATCH] bash-colors: improve it

---
 .bin/bash-colors | 86 ++++++++++++++++++++++++++++++++----------------
 1 file changed, 58 insertions(+), 28 deletions(-)

diff --git a/.bin/bash-colors b/.bin/bash-colors
index 5474f9b..820958b 100755
--- a/.bin/bash-colors
+++ b/.bin/bash-colors
@@ -1,7 +1,8 @@
 #!/bin/bash
+# Author: Mike Frysinger <vapier@gmail.com>; released into the public domain; suck it.
 
-if [[ $1 == "--env" ]] ; then
-	colors=(
+show_env() {
+	local c colors=(
 		GOOD="\$'\e[32;01m'"
 		WARN="\$'\e[33;01m'"
 		BAD="\$'\e[31;01m'"
@@ -13,35 +14,64 @@ if [[ $1 == "--env" ]] ; then
 		[[ -t 0 ]] || c="${c%=*}="
 		echo "${c}"
 	done
+}
 
-	exit 0
-fi
+check256() {
+	if [[ ${TERM} != *-256color ]] ; then
+		(
+		echo "warning: TERM (${TERM}) does not end in '-256color';"
+		echo "warning: trying to use 256 colors might not work."
+		) >&2
+	fi
+}
 
 showit() {
 	echo -e '\e['"${1};${2}mthis color is: \\\\e[${1};${2}m    \e[0m"
 }
-case $1 in
-""|16|system)
-	for i in {0..1} ; do
-		for j in {30..37} ; do
-			showit ${i} ${j}
+
+main() {
+	case $1 in
+	--env)
+		show_env
+		;;
+	""|16|system)
+		for i in {0..1} ; do
+			for j in {30..37} ; do
+				showit ${i} ${j}
+			done
 		done
-	done
-	;;
-cube|6x6x6)
-	for n in {16..231} ; do
-		showit "38;05" $(printf '%03i' ${n})
-	done
-	;;
-gr[ae]y)
-	for n in {232..255} ; do
-		showit "38;05" ${n}
-	done
-	;;
-all|256)
-	for x in system cube gray ; do
-		echo "### SET: ${x}"
-		"$0" ${x}
-	done
-	;;
-esac
+		;;
+	cube|6x6x6)
+		check256
+		for n in {16..231} ; do
+			showit "38;05" $(printf '%03i' ${n})
+		done
+		;;
+	gr[ae]y)
+		check256
+		for n in {232..255} ; do
+			showit "38;05" ${n}
+		done
+		;;
+	all|256)
+		for x in system cube gray ; do
+			echo "### SET: ${x}"
+			"$0" ${x}
+		done
+		;;
+	*)
+		cat <<-EOF
+			usage: $0 [colors]
+
+			Colors:
+			 - --env        - show env you can eval in a shell
+			 - 16, system   - show basic colors (default)
+			 - cube, 6x6x6  - show most extended colors
+			 - gray         - show gray scale
+			 - all, 256     - show all colors
+		EOF
+		exit 1
+		;;
+	esac
+}
+main "$@"
-- 
2.39.5