Support for disabling short-name repo

defaults

@@ -1,2 +1,3 @@
 # enables the use of .ruby-version like files used by other version managers
 legacy_version_file = no
+asdf_repository_url = https://github.com/asdf-vm/asdf-plugins.git

lib/utils.bash

@@ -32,10 +32,6 @@ asdf_dir() {
   printf "%s\\n" "$ASDF_DIR"
 }
 
-asdf_repository_url() {
-  printf "https://github.com/asdf-vm/asdf-plugins.git\\n"
-}
-
 asdf_data_dir() {
   local data_dir
 
@@ -404,7 +400,11 @@ initialize_or_update_repository() {
   local repository_url
   local repository_path
 
-  repository_url=$(asdf_repository_url)
+  repository_url="$(get_asdf_config_value "asdf_repository_url")"
+  if [ ! -n "$repository_url" ]; then
+    printf "No short-name plugin repository in configuration\\n" >&2
+    exit 1
+  fi
   repository_path=$(asdf_data_dir)/repository
 
   if [ ! -d "$repository_path" ]; then

test/plugin_add_command.bats

@@ -41,6 +41,31 @@ teardown() {
   [ "$output" = "elixir" ]
 }
 
+@test "plugin_add command with no URL specified adds a plugin using repo from config" {
+  ASDF_CONFIG_FILE=$BATS_TMPDIR/asdfrc
+  cat > $ASDF_CONFIG_FILE <<-EOM
+asdf_repository_url = "https://github.com/asdf-vm/asdf-plugins.git"
+EOM
+
+  run asdf plugin add "elixir"
+  [ "$status" -eq 0 ]
+
+  run asdf plugin-list
+  # whitespace between 'elixir' and url is from printf %-15s %s format
+  [ "$output" = "elixir" ]
+}
+
+@test "plugin_add command with no URL specified fails to add a plugin when no default repo" {
+  ASDF_CONFIG_FILE=$BATS_TMPDIR/asdfrc
+  cat > $ASDF_CONFIG_FILE <<-EOM
+# no asdf_repository_url for the tests
+EOM
+
+  run asdf plugin add "elixir"
+  [ "$status" -eq 1 ]
+  [ "$output" = "No short-name plugin repository configured" ]
+}
+
 @test "plugin_add command with URL specified adds a plugin using repo" {
   install_mock_plugin_repo "dummy"