utilize opendesktop.org API

When trying to extract the tabular information about downloadable files
on the theme page at opendesktop.org, the table apparently containing
the sought information in the loaded webpage lacks any content in the
HTML source code. Examining the load process with Firefox network
analysis gave away an API endpoint from which this data is retrieved via
JavaScript.

Though not much documentation could be found about it, it obviously
provides information about downloadable files in JSON format, which is
much easier to parse than the HTML page intended for presentation to
human eye anyway. Some tinkering found that queries can sensibly be
composed of some of the provided variables. The id is particularily
useful as we already have it in the URL, filtering only on active files
that are actually retrievable helps, too.

1 files changed, 9 insertions, 9 deletions

diff --git a/PKGBUILD b/PKGBUILD
index 430bc78463f6..3b81231a7a50 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -6,11 +6,11 @@ pkgver=3.20.20160705
 pkgrel=1
 pkgdesc='Easy On The Eyes GNOME Shell, GTK2, GTK3 and Cinnamon themes'
 arch=('any')
-url='https://www.opendesktop.org/p/1143475/'
+url='https://www.opendesktop.org/p/1143475'
 license=('GPL3')
-makedepends=('lbxml2')
+makedepends=('jq')
 optdepends=('gtk-engine-murrine: for GTK2 themes')
-source=("version::version${url#https}"
+source=("version::version://dl.opendesktop.org/api/files/index?format=json&status=active&collection_content_id=${url##*/}"
         'https://dl.opendesktop.org/api/files/download/id/1468995652/Dark-Aurora.tar.gz')
 sha256sums=('f5bbb7ea941d120d03237a28d07411aafc23e866b184083e37e02eda65aa3072'
             '6fbdaaae2e59b5f514ca003ba2552fcb7eb5724bd278e291ed5ae2036563d6ff')
@@ -18,14 +18,14 @@ sha256sums=('f5bbb7ea941d120d03237a28d07411aafc23e866b184083e37e02eda65aa3072'
 # The following is a very convoluted script because of makepkg's DLAGENTS escaping logic.
 # An agent is added for the protocol "version". It is treated like http, which is done by processing
 # the input url %u with sed, replacing the protocol back to http. Everything downloaded is then not
-# immediatley saved to the output file name %o, but first piped through sed, which finds the
-# gnome-shell version string in the Dark Aurora page on GNOME-Look.org.
-# This makes a file containing the version readily available to both pkgver and package so that they
-# not both have to sed out the version from the webpage themselves.
+# immediatley saved to the output file name %o, but first piped through jq, which finds the
+# gnome-shell version string in the JSON metadata received from the Dark Aurora page on
+# GNOME-Look.org. This makes a file containing the version readily available to both pkgver
+# and package so that they not both have to extract the version themselves again and again.
 DLAGENTS=("version::/usr/bin/bash -c $(
   printf '%s\n' "${DLAGENTS[@]}" | sed -n 's/http::\(.*\)/\1/p' \
-    | sed 's/-[^ ] %o //' | sed 's/ /\\ /g' | sed 's/%u/$(echo\\ %u\\ |\\ sed\\ "s\/^version\/http\/")/'
-)\ |\ xmllint\ --html\ --xpath\ 'normalize-space(//span[@class=\"value\"][1]/text())'\ -\ 2>/dev/null\ >\ %o"
+    | sed 's/-[^ ] %o //' | sed 's/ /\\ /g' | sed 's/%u/$(echo\\ \"%u\"\\ |\\ sed\\ "s\/^version\/http\/")/'
+)\ |\ jq\ -j\ '.files."0".version'\ >\ %o"
 "${DLAGENTS[@]}")
 
 pkgver() {