#!/usr/bin/env bash

#
# Script to create a markdown file containing links to all filenames prefixed
# with "<prefix>-":
#
# Example usage: generate-md-index "book" "Books" "my-books.md"
#
#   Creates a file my-books.md in the wiki with a title of "Books" This file
#   contains titled links to every markdown file starting with "books-"

wiki="$HOME/.wiki"
prefix="$1"
title="$2"
filename="$3"

if [ $# == 2 ]; then
    echo "$0 <prefix> <title> <filename>"
    exit 0
fi

find "$wiki"/"$prefix"-*.md -printf "%f\n"        > "$wiki/scripts/$prefix/$prefix-links"
find "$wiki"/"$prefix"-*.md -exec head -n 1 {} \; > "$wiki/scripts/$prefix/$prefix-titles"

sed -i -e 's/^/(/' "$wiki/scripts/$prefix/$prefix-links" -e 's/$/)/'  # Wrap links in parentheses
sed -i -e 's/^/[/' "$wiki/scripts/$prefix/$prefix-titles" -e 's/$/]/' # Wrap titles in square brackets
sed -i -e 's/^\[#\ /* \[/'  "$wiki/scripts/$prefix/$prefix-titles"    # Remove '#' and add list bullet

echo -e "# $title\n" > "$wiki/$filename" # Clear file and add markdown title
paste "$wiki/scripts/$prefix/$prefix-titles" "$wiki/scripts/$prefix/$prefix-links" -d "" >> "$wiki/$filename"   # Concatenate & append to file
paste "$wiki/scripts/$prefix/$prefix-titles" "$wiki/scripts/$prefix/$prefix-links" -d ""