#!/bin/bash
set -euo pipefail

[[ $# -lt 1 ]] && echo "usage: newPost \"title\" tag1 tag2 ..." && exit 1

blog_root="/home/b/blog/brontosaurusrex.github.io"
[[ ! -d "$blog_root" ]] && echo "$blog_root not found" && exit 1

title="$1"
shift

postname=$(echo "$title" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9]/-/g; s/-\+/-/g; s/^-//; s/-$//')
today=$(date +%Y-%m-%d)
post="${blog_root}/_posts/${today}-${postname}.md"

editor="${EDITOR:-hx}"

if [ -f "$post" ]; then
    echo "already exists, opening"
    "$editor" "$post"
    exit 0
fi

validtag=(audio bash blender books cli linux luv mine misc nvidia video web ai chess)

jdate=$(date -u +"%Y-%m-%d %H:%M +0000")

tmp=$(mktemp)

{
echo "---"
echo "published: true"
echo "layout: post"
echo "date: '$jdate'"
echo "title: \"$title\""
echo -n "tags: "

for tag in "$@"; do
    [[ " ${validtag[*]} " == *" $tag "* ]] && echo -n "$tag "
done

echo
echo "---"
} > "$tmp"

mv "$tmp" "$post"

"$editor" "$post"