bugfixes by imchairmanm

mdtool

#!/bin/bash

set -e

swap() {
	set -eu

	a=$1
	b=$2

	mv "$a" "$a.backup"
	mv "$b" "$b.backup"

	numberA=$(echo $a | cut -d- -f1)
	afterA=$(printf "%s" "${a#*-}")
	numberB=$(echo $b | cut -d- -f1)
	afterB=$(printf "%s" "${b#*-}")

	mv "$a.backup" "$numberB-$afterA"
	mv "$b.backup" "$numberA-$afterB"
}

insert() {
	set -eu

	new=$1

	set +u
	until_index=${2:-999999}
	set -u

	for file in $(ls | sort -g -r); do
		filename=$(basename "$file")
		number=$(echo "$filename" | cut -d- -f1)
		number=${number:-0}
		after=$(printf "%s" "${filename#*-}")
		extension="${filename##*.}"

		if [ "$extension" != "mdx" ] && [ "$filename" != "$extension" ]; then
			continue
		fi

		if [ "$file" = "index.mdx" ]; then
			continue
		fi

		if [ $number -ge $until_index ]; then
			continue
		fi

		if [ $number -ge $new ]; then
			mv "$file" "$(printf "%02d" "$((10#$number + 1))")-$after"
		fi
	done
}

remove() {
	set -eu

	new=$1

	set +u
	until_index=${2:--999999}
	set -u

	for file in $(ls | sort -g -r); do
		filename=$(basename "$file")
		number=$(echo "$filename" | cut -d- -f1)
		number=${number:-0}
		after=$(printf "%s" "${filename#*-}")
		extension="${filename##*.}"

		if [ "$extension" != "mdx" ] && [ "$filename" != "$extension" ]; then
			continue
		fi

		if [ "$file" = "index.mdx" ]; then
			continue
		fi

		if [ "$number" -le "$until_index" ]; then
			continue
		fi

		if [ $number -gt $new ]; then
			mv "$file" "$(printf "%02d" "$((10#$number - 1))")-$after"
		fi
	done
}

move() {
	set -eu

	move_file=$1 # 09-filtering.mdx
	to_index=$2 # 3

	# TODO handle moving to the other direction :')

	mvinitial_index=$(echo $move_file | cut -d- -f1)
	mvafter=$(printf "%s" "${move_file#*-}")

	mv "$move_file" "/tmp/$move_file"

	# e.g. if 09 >= 3
	if [ $mvinitial_index -ge $to_index ]; then
		echo "insert"
		insert $to_index $mvinitial_index
	else
		echo "remove"
		# remove $mvinitial_index $((to_index - 1))

		new=$((10#$to_index - 1))

		set +u
		until_index=$mvinitial_index
		set -u

		for file in $(ls | sort -g -r); do
			filename=$(basename "$file")
			number=$(echo "$filename" | cut -d- -f1)
			after=$(printf "%s" "${filename#*-}")
			extension="${filename##*.}"

			if [ "$extension" != "mdx" ] && [ "$filename" != "$extension" ]; then
				continue
			fi

			if [ "$file" = "index.mdx" ]; then
				continue
			fi

			if [ $number -le $until_index ]; then
				continue
			fi

			if [ $number -le $((10#$new + 1)) ]; then
				mv "$file" "$(printf "%02d" "$((10#$number - 1))")-$after"
			fi
		done

	fi

	mv "/tmp/$move_file" "$(printf "%02d" "$to_index")-$mvafter"
}

if [ $1 = "swap" ]; then
	swap $2 $3
elif [ $1 = "insert" ]; then
	insert $2 $3
elif [ $1 = "remove" ]; then
	remove $2 $3
elif [ $1 = "move" ]; then
	move $2 $3
else
	echo "no such command $1"
	exit 1
fi