Add italic function

thebookofcolors

@@ -45,6 +45,17 @@ subtitle() {
 	printf "\e[0m"
 }
 
+italic() {
+	if test -z "$1"; then
+		printf "No title provided." 1>&2
+		exit 1
+	fi
+
+	printf "\e[3;37m"
+	printf "$1"
+	printf "\e[0m"
+}
+
 section_introduction() {
 	title "Introduction"
 
@@ -80,8 +91,8 @@ section_anatomy() {
 
 	printf "Overall, a control sequence is formatted like so:\n"
 	newline
-	printf "\e[3m0x1B + [ + <zero or more numbers, separated by semicolons> + <a letter>\e[0m\n"
-	newline
+	italic "0x1B + [ + <zero or more numbers, separated by semicolons> + <a letter>"
+	newline 2
 	printf "The CSI sequence we've gone over already. The easiest way to think about this is that the letter is the name of a function, and the semicolon-delimited numbers are the arguments to said function.\n"
 	printf "By this model of thinking about escape sequences like function calls means you would read \"\\\e[0;1;34m\" as m(0, 1, 34), and \"\\\e[A\" as A().\n"
 	newline
@@ -172,7 +183,13 @@ section_background_colors() {
 section_8bit_colors() {
 	title "Codes 38;5 and 48;5; 8-bit (256) Colors"
 
-	printf 'TODO\n'
+	printf "When 8-bit color support started to become more common on graphics cards, some terminals added the ability to select from an extended 8-bit color palette, giving a total of 256 colors.\n"
+	printf "The syntax for selecting one of these colors is "
+	italic "\\\e[38;5;n"
+	printf " for foreground colors, or "
+	italic "\\\e[48;5;n"
+	printf " for background colors.\n"
+
 }
 
 section_rgb_colors() {