pure bash bible

read

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+message="Valid entries are: <num>-<num>, <num>-,-<num>, <num>, ''"
+path=$( readlink -f $0 )
+path=${path%/*}
+printf '%s\n' "Chapters:"
+for num in {0..19}; do
+	file="$path/chapter$num.txt"
+	(( ${#num} == 1 )) && num="0$num"
+	h=$( grep -m1 . $file )
+	h=${h:2}                       # rm first 2 chars ('# ')
+#	h="${h#"${h%%[![:space:]]*}"}" # rm leading white spaces
+	h=${h,,}                       # all to lowercase
+	h=${h^}                        # first to uppercase
+	printf '%s\n' "$num: $h"
+done
+
+re_num='^[0-9]+$'
+while true; do
+	read -p "Input range: " range
+	# echo "you chose $range"
+	start=${range%%-*}
+	: ${start:=0}
+	end=${range##*-}
+	: ${end:=19}
+	# echo "start is $start and end is $end"
+	[[ $start =~ $re_num ]] && [[ $end =~ $re_num ]] && break || echo "Not a valid range. $message"
+done
+
+for num in {0..19}; do
+	file="$path/chapter$num.txt"
+	(( $num >= $start )) && (( $num <= $end )) && pandoc -s --from=markdown --to=pdf $file | zathura -
+#	(( $num >= $start )) && (( $num <= $end )) && printf '%s\n' "$file"
+done