A bar plugin for topgrade: the glyph carries the number of packages waiting, and
the panel counts them and starts the upgrade in a terminal window.
topgrade has no "how many packages?" mode, so counting is two-staged.
`topgrade --dry-run --no-self-update` reports the steps topgrade would actually
run, which is how the user's own topgrade.toml decides what gets counted; each
"Dry running:" command is then matched against a table of 13 package managers,
and every match is asked once, read-only, to list what it has pending. The count
is the length of that list, so the bar number and the list a panel row expands
into are the same answer and expanding costs no second trip to a mirror.
Steps nothing can count are named rather than folded into the total, and a
partly covered step names the manager that could not answer, so an Arch box with
an AUR helper but no pacman-contrib never reads its AUR total as the whole
system update.
The upgrade never runs in the background: it opens a terminal so package
managers can prompt and sudo can ask on the tty. The plugin writes no files and
never rewrites topgrade's configuration.
Co-authored-by: nightwatch75 <nightwatch75@users.noreply.github.com>
