Show sibling projects' versions, and let version update them

A sibling's version is its latest git tag (v1.4.0, or v1.4.0+3 for commits
after it), or, without tags, its commit's date and short hash, like
CoreDesktop's own. The version shown as available is that of the newest
commit on the default branch, which is what update installs.

sibling list shows each sibling's version. sibling check fetches every
sibling at once and shows which have a newer version, and sibling update
[name...] updates the named siblings or all of them. 71-siblings.sh now
runs sibling update, so update and version share one way of updating.

version lists the installed siblings with any newer version and, when run
in a terminal, asks for each one whether to update it now. version --check
and the update notification still only look at CoreDesktop.

The sibling skill docs describe how to release a version by tagging it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

version

@@ -8,6 +8,9 @@
 # because they come from Arch, not CoreDesktop, along with any newer release of
 # either that update would install.
 #
+# Sibling projects (see sibling) are listed with their versions too. If any has
+# a newer version, version asks, for each one, whether to update it now.
+#
 # version --check prints the newer version and exits 0 if one is available,
 # exits 1 if this machine is up to date, or 2 if it couldn't check.
 
@@ -125,6 +128,29 @@ echo "Kernel       $kernel"
 [ -n "$driver" ] && echo "Video driver $driver"
 echo "Last update  $last_update"
 
+# Sibling projects, as "name<TAB>installed<TAB>available" lines (see sibling)
+siblings="$(bash "$COREDESKTOP/sibling" check --porcelain 2> /dev/null)"
+newer_siblings=()
+if [ -n "$siblings" ]; then
+  echo
+  echo "Sibling projects"
+  width=0
+  while IFS=$'\t' read -r name _; do
+    (( ${#name} > width )) && width=${#name}
+  done <<< "$siblings"
+  while IFS=$'\t' read -r name installed available; do
+    case "$available" in
+      "") ;;
+      "?") installed="$installed, couldn't check for a newer version" ;;
+      *)
+        installed="$installed, $available is available"
+        newer_siblings+=("$name"$'\t'"$available")
+        ;;
+    esac
+    printf '  %-*s  %s\n' "$width" "$name" "$installed"
+  done <<< "$siblings"
+fi
+
 # Packages newer than the mirror's last sync aren't shown above, or installed
 if age="$(mirror_age_hours)" && (( age >= MIRROR_STALE_HOURS )); then
   if (( age >= 48 )); then ago="$(( age / 24 )) days"; else ago="$age hours"; fi
@@ -132,3 +158,19 @@ if age="$(mirror_age_hours)" && (( age >= MIRROR_STALE_HOURS )); then
   echo -e "\e[33mYour package mirror ($(first_mirror)) last synced with Arch $ago ago, so"
   echo -e "newer packages may be missing. Run update to switch to up-to-date mirrors.\e[0m"
 fi
+
+# Offer each newer sibling, but only to someone at the terminal to answer
+if (( ${#newer_siblings[@]} > 0 )) && [ -t 0 ] && [ -t 1 ]; then
+  echo
+  chosen=()
+  for sibling in "${newer_siblings[@]}"; do
+    IFS=$'\t' read -r name available <<< "$sibling"
+    read -rp "Update $name to $available? [y/N] " response
+    [[ "$response" =~ ^[yY]([eE][sS])?$ ]] && chosen+=("$name")
+  done
+  if (( ${#chosen[@]} > 0 )); then
+    echo
+    bash "$COREDESKTOP/sibling" update "${chosen[@]}"
+    exit
+  fi
+fi