#!/usr/bin/env bash

# Copyright 2020 nytpu
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.


# change configuration variables here to suit you
### be sure to also change the header and footer in build_entries! ###
make_globals() {
	global_title="swiftmandolin's gemlog"
	global_description="a gemlog about nonsense you probably don't care about"
	global_url="gemini://rawtext.club/~swiftmandolin/gemlog/" # link to base url of gemlog
	global_author="swiftmandolin"
	global_author_email="swiftmandolin@tilde.team"
	global_author_url="gemini://rawtext.club/~swiftmandolin/index.gmi" # homepage of author
	global_license="CC BY 4.0"

	gemlog_feed="atom.xml" # filename of the atom feed
	number_of_feed_articles="50" # maximum number of posts added to atom feed
	feed_base_url="gemini://rawtext.club/~swiftmandolin/gemlog/" # base url that the feed is hosted at
	feed_web_url="https://swiftmandolin.tilde.team/files/" # base url that the feed is hosted at on the web

	index="index.gmi" # main page of gemlog, not recommended to change

	use_year_divider=true # separate posts from different years with a heading?

	# these 2 are exclusive, and use_month_divider_nl takes priority if both are set
	use_month_divider_nl=true # separate posts from different months with a newline?
	use_month_divider_hd=false # separate posts from different months with a heading?


	gemlog_sh_link="https://tildegit.org/nytpu/gemlog.sh" # link to the utility, you should change this if you've made substantial non-configuration changes

	# don't change these
	date_format_8601="+%Y-%m-%dT%H:%M:%S%:z" # *formal* ISO-8601 format including time zone
	date_format_8601_timeless="+%Y-%m-%dT12:00:00%:z" # *formal* ISO-8601 format with fixed preset time
	monthnames=( "invalid" "January" "February" "March" "April" "May" "June" "July" "August" "September" "October" "November" "December" )
}

get_post_title() {
	cat "$1" | perl -lne 's/#{1,3}\s+(.*)/\1/ or next; print; exit'
}

build_entries() {
	echo "Building index..."

	indexfile="$index.$RANDOM"
	while [[ -f $indexfile ]]; do indexfile="$index.$RANDOM"; done

	{
		# header of the page (above the posts list)
		cat << 'EOF'
```some crazy looking ASCII art that says gemlog
                                                    .-'''-.              
                                           .---.   '   _    \            
             __.....__      __  __   ___   |   | /   /` '.   \           
  .--./) .-''         '.   |  |/  `.'   `. |   |.   |     \  '  .--./)   
 /.''\\ /     .-''"'-.  `. |   .-.  .-.   '|   ||   '      |  '/.''\\    
| |  | /     /________\   \|  |  |  |  |  ||   |\    \     / /| |  | |   
 \`-' /|                  ||  |  |  |  |  ||   | `.   ` ..' /  \`-' /    
 /("'` \    .-------------'|  |  |  |  |  ||   |    '-...-'`   /("'`     
 \ '---.\    '-.____...---.|  |  |  |  |  ||   |               \ '---.   
  /'""'.\`.             .' |__|  |__|  |__||   |                /'""'.\  
 ||     || `''-...... -'                   '---'               ||     || 
 \'. __//                                                      \'. __//  
  `'---'                                                        `'---'  
```

by switmandolin
EOF
		curyear=""
		curmonth=""
		while IFS='' read -r i; do
			post=$(basename $i)
			title=$(get_post_title "$i")
			pubdate=$(echo $i | perl -ne '/^(\d{4}-\d{2}-\d{2}).*/; print $1')

			newcuryear=$(echo $i | perl -ne '/^(\d{4})-\d{2}-\d{2}.*/; print $1')
			newcurmonth=$(echo $i | perl -ne '/^\d{4}-(\d{2})-\d{2}.*/; print $1')
			if [ "$newcuryear" != "$curyear" ] && $use_year_divider; then
				printf "\n\n## $newcuryear\n"
				curyear="$newcuryear"
			fi
			if [ "$newcurmonth" != "$curmonth" ]; then
				if $use_month_divider_nl; then
					printf "\n"
				elif $use_month_divider_hd; then
					printf "\n### ${monthnames[${newcurmonth#0}]}\n\n"
				fi
				curmonth="$newcurmonth"
			fi

			printf "=> $global_url$post $pubdate — $title\n"
		done < <(ls -r [[:digit:]]*.gmi)

		# footer of the page (below the list of posts)
		cat << EOF


──────────────────

=> $global_author_url go home

=> $feed_base_url$gemlog_feed this gemlog has an atom feed at: $feed_base_url$gemlog_feed
=> $feed_web_url$gemlog_feed or through the web at: $feed_web_url$gemlog_feed

=> $gemlog_sh_link generated with gemlog.sh

=> https://patorjk.com/software/taag/#p=display&h=2&v=0&f=Crazy&t=gemlog ASCII Art by Patrick Gillespie
EOF
	} 3>&1 >"$indexfile"

	mv "$indexfile" "$index"
	chmod 644 "$index"
}

toot() {
	filename=$(ls -r ./[[:digit:]]*.gmi | head -n 1 | xargs basename)
	title=$(get_post_title "$filename")
	read -r -p "do you want to toot the newest post? [y/N] " response
	if [[ "$response" =~ ^([yY][eE][sS]|[yY])$ ]]
	then
		echo "tooting..."
		# change this if you want the toot to have different content
		printf "new gemlog post: ${title}\n\n${global_url}${filename}\n" | toot post
	fi
}

make_globals
build_entries