#!/bin/bash
# xchangelog PKGNAME - open package changelog

XBPS_DISTDIR=$(xdistdir) || exit 1
FILTER=cat

pkg=$1
[ -z "$pkg" ] && pkg=$(basename "$PWD")

if [ -f "$pkg" ]; then
	template="$pkg"
elif [ -f "$pkg/template" ]; then
	template="$pkg/template"
elif [ -f "$XBPS_DISTDIR/srcpkgs/$pkg/template" ]; then
	template="$XBPS_DISTDIR/srcpkgs/$pkg/template"
else
	echo "No such template: $pkg" >&2
	exit 1
fi

. "$template"

if [ -z "$changelog" ]; then
	echo "No changelog defined in template" >&2
	exit 1
fi

if [ -t 1 ]; then
	if type less >/dev/null; then
		: "${PAGER:=less -r}"
	fi
	content_type="$(curl -sLI -w "%{content_type}" -o /dev/null -- "$changelog")"
	case "$content_type" in
	"text/plain"*)
		if [[ "$changelog" = *".md" ]] && type mdcat >/dev/null; then
			FILTER="mdcat"
		elif [[ "$changelog" = *".rst" ]] && type rst2ansi >/dev/null; then
			FILTER="rst2ansi"
		fi
		;;
	"text/markdown"*)
		if type mdcat >/dev/null; then
			FILTER="mdcat"
		fi
		;;
	*)
		if type xdg-open >/dev/null; then
			xdg-open "$changelog"
		elif [ -n "$BROWSER" ]; then
			"$BROWSER" "$changelog"
		else
			echo 'Cannot open changelog in web browser, please install xdg-open or define $BROWSER' >&2
			exit 1
		fi
		exit 0
		;;
	esac
else
	: "${PAGER:=cat}"
fi

curl -sL -- "$changelog" | $FILTER | $PAGER