eclipses: fix update script to handle new download page format (#500896)

#!/usr/bin/env nix-shell

#! nix-shell -i bash --pure -p curl cacert libxml2 yq nix jq

#! nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/3c7487575d9445185249a159046cc02ff364bff8.tar.gz

#! nix-shell -i bash --pure -p curl cacert nix jq

#! nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/5b2c2d84341b2afb5647081c1386a80d7a8d8605.tar.gz

#                                                                ^

#                                                                |

#                   nixos-unstable ~ 2023-07-06 -----------------/

#                   nixos-unstable ~ 2026-03-16 -----------------/

set -o errexit

set -o nounset

# scrape the downloads page for release info

curl -s -o eclipse-dl.html https://download.eclipse.org/eclipse/downloads/

trap "rm eclipse-dl.html" EXIT

curl -s -O https://download.eclipse.org/eclipse/downloads/data.json

trap "rm data.json" EXIT

dlquery() {

    q=$1

    xmllint --html eclipse-dl.html --xmlout 2>/dev/null | xq -r ".html.body.main.div.table[3].tr[1].td[0].a${q}";

    q="$1"

    cat data.json | jq -r ".releases[0] | $q";

}

# extract release info from download page HTML

platform_major=$(dlquery '."#text" | split(".") | .[0]' -r);

platform_minor=$(dlquery '."#text" | split(".") | .[1]' -r);

platform_major=$(dlquery '.label | split(".") | .[0]');

platform_minor=$(dlquery '.label | split(".") | .[1]');

year=$(dlquery '."@href" | split("/") | .[] | select(. | startswith("R")) | split("-") | .[2] | .[0:4]')

buildmonth=$(dlquery '."@href" | split("/") | .[] | select(. | startswith("R")) | split("-") | .[2] | .[4:6]')

builddaytime=$(dlquery '."@href" | split("/") | .[] | select(. | startswith("R")) | split("-") | .[2] | .[6:12]')

year=$(dlquery '.path | split("/") | .[] | select(. | startswith("R")) | split("-") | .[2] | .[0:4]')

buildmonth=$(dlquery '.path | split("/") | .[] | select(. | startswith("R")) | split("-") | .[2] | .[4:6]')

builddaytime=$(dlquery '.path | split("/") | .[] | select(. | startswith("R")) | split("-") | .[2] | .[6:12]')

timestamp="${year}${buildmonth}${builddaytime}";

# account for possible release-month vs. build-month mismatches