feat(latest): adds the flag --all to the latest command

As discussed in asdf-vm#1036, this patch adds a `--all` flag to the latest
command which will show the list of plugins, their latest version and if
this one is installed or not.

This patch basically reuses the logic used in the list command and the
latest command. The main different is the removal of the query
paramenter as different plugins might need different queries.

lib/commands/command-latest.bash

@@ -7,6 +7,10 @@ latest_command() {
   local query=$2
   local plugin_path
 
+  if [ "$plugin_name" == "--all" ]; then
+    latest_all
+  fi
+
   [[ -z $query ]] && query="$DEFAULT_QUERY"
 
   plugin_path=$(get_plugin_path "$plugin_name")
@@ -35,4 +39,49 @@ latest_command() {
   printf "%s\n" "$versions"
 }
 
+latest_all() {
+  local plugins_path
+  plugins_path=$(get_plugin_path)
+
+  if ls "$plugins_path" &>/dev/null; then
+    for plugin_path in "$plugins_path"/*; do
+      plugin_name=$(basename "$plugin_path")
+
+      # Retrieve the version of the plugin
+      local version
+      if [ -f "${plugin_path}/bin/latest-stable" ]; then
+        # We can't filter by a concrete query because different plugins might
+        # have different queries.
+        version=$("${plugin_path}"/bin/latest-stable "")
+        if [ -z "${version}" ]; then
+          version="unknown"
+        fi
+      else
+        # pattern from xxenv-latest (https://github.com/momo-lab/xxenv-latest)
+        version=$(asdf list-all "$plugin_name" |
+          grep -vE "(^Available version:|-src|-dev|-latest|-stm|[-\\.]rc|-alpha|-beta|[-\\.]pre|-next|(a|b|c)[0-9]+|snapshot|master)" |
+          sed 's/^[[:space:]]\+//' |
+          tail -1)
+        if [ -z "${version}" ]; then
+          version="unknown"
+        fi
+      fi
+
+      local installed_status
+      installed_status="missing"
+
+      local installed_versions
+      installed_versions=$(list_installed_versions "$plugin_name")
+
+      if ! printf '%s\n' "$installed_versions" | grep -q "^$version\$"; then
+        installed_status="installed"
+      fi
+      printf "%s\\t%s\\t%s\\n" "$plugin_name" "$version" "$installed_status"
+    done
+  else
+    printf "%s\\n" 'No plugins installed'
+  fi
+  exit 0
+}
+
 latest_command "$@"

test/latest_command.bats

@@ -59,3 +59,12 @@ teardown() {
   [ "$(echo "No compatible versions available (legacy-dummy 3)")" == "$output" ]
   [ "$status" -eq 1 ]
 }
+
+################################
+####      latest --all      ####
+################################
+@test "[latest_command - all plugins] shows the latest stable version of all plugins" {
+  run asdf latest --all
+  [ "$(echo -e "dummy\t2.0.0\tinstalled\nlegacy-dummy\t2.0.0\tinstalled\n")" == "$output" ]
+  [ "$status" -eq 0 ]
+}