Rename ejabberd_config:similar_option/2 -> misc:best_match/2

3 files changed, 35 insertions, 33 deletions

diff --git a/src/ejabberd_config.erl b/src/ejabberd_config.erl
index 40d157a8..f4abf8d5 100644
--- a/src/ejabberd_config.erl
+++ b/src/ejabberd_config.erl
@@ -39,7 +39,7 @@
 	 default_queue_type/1, queue_dir/0, fsm_limit_opts/1,
 	 use_cache/1, cache_size/1, cache_missed/1, cache_life_time/1,
 	 codec_options/1, get_plain_terms_file/2, negotiation_timeout/0,
-	 similar_option/2, get_modules/0]).
+	 get_modules/0]).
 
 -export([start/2]).
 
@@ -1102,7 +1102,7 @@ validate_opts(#state{opts = Opts} = State, ModOpts) ->
 				_ ->
 				    KnownOpts = dict:fetch_keys(ModOpts),
 				    ?ERROR_MSG("Unknown option '~s', did you mean '~s'?",
-					       [Opt, similar_option(Opt, KnownOpts)]),
+					       [Opt, misc:best_match(Opt, KnownOpts)]),
 				    erlang:error(unknown_option)
 			    end
 		    end, Opts),
@@ -1126,34 +1126,6 @@ is_file_readable(Path) ->
 	    false
     end.
 
--spec similar_option(atom(), [atom()]) -> atom().
-similar_option(Pattern, [_|_] = Opts) ->
-    String = atom_to_list(Pattern),
-    {Ds, _} = lists:mapfoldl(
-		fun(Opt, Cache) ->
-			{Distance, Cache1} = ld(String, atom_to_list(Opt), Cache),
-			{{Distance, Opt}, Cache1}
-		end, #{}, Opts),
-    element(2, lists:min(Ds)).
-
-%% Levenshtein distance
--spec ld(string(), string(), map()) -> {non_neg_integer(), map()}.
-ld([] = S, T, Cache) ->
-    {length(T), maps:put({S, T}, length(T), Cache)};
-ld(S, [] = T, Cache) ->
-    {length(S), maps:put({S, T}, length(S), Cache)};
-ld([X|S], [X|T], Cache) ->
-    ld(S, T, Cache);
-ld([_|ST] = S, [_|TT] = T, Cache) ->
-    try {maps:get({S, T}, Cache), Cache}
-    catch _:{badkey, _} ->
-            {L1, C1} = ld(S, TT, Cache),
-            {L2, C2} = ld(ST, T, C1),
-            {L3, C3} = ld(ST, TT, C2),
-            L = 1 + lists:min([L1, L2, L3]),
-            {L, maps:put({S, T}, L, C3)}
-    end.
-
 get_version() ->
     case application:get_env(ejabberd, custom_vsn) of
 	{ok, Vsn0} when is_list(Vsn0) ->
diff --git a/src/gen_mod.erl b/src/gen_mod.erl
index eb433de5..b972285f 100644
--- a/src/gen_mod.erl
+++ b/src/gen_mod.erl
@@ -585,7 +585,7 @@ validate_opts(Host, Module, Opts0) ->
 				   " did you mean '~s'?"
 				   " Available options are: ~s",
 				   [Opt, Module,
-				    ejabberd_config:similar_option(Opt, KnownOpts),
+				    misc:best_match(Opt, KnownOpts),
 				    misc:join_atoms(KnownOpts, <<", ">>)]),
 	    module_error(ErrTxt)
     end.
@@ -746,7 +746,7 @@ format_module_error(Module, Fun, Arity, Opts, Class, Reason, St) ->
 			  "exists inside either ~s or ~s "
 			  "directory",
 			  [Fun, Module,
-			   ejabberd_config:similar_option(
+			   misc:best_match(
 			     Module, ejabberd_config:get_modules()),
 			   Module,
 			   filename:dirname(code:which(?MODULE)),
diff --git a/src/misc.erl b/src/misc.erl
index 73d05ff2..4f683a43 100644
--- a/src/misc.erl
+++ b/src/misc.erl
@@ -39,7 +39,7 @@
 	 css_dir/0, img_dir/0, js_dir/0, msgs_dir/0, sql_dir/0, lua_dir/0,
 	 read_css/1, read_img/1, read_js/1, read_lua/1, try_url/1,
 	 intersection/2, format_val/1, cancel_timer/1, unique_timestamp/0,
-	 is_mucsub_message/1]).
+	 is_mucsub_message/1, best_match/2]).
 
 %% Deprecated functions
 -export([decode_base64/1, encode_base64/1]).
@@ -425,6 +425,18 @@ cancel_timer(TRef) when is_reference(TRef) ->
 cancel_timer(_) ->
     ok.
 
+-spec best_match(atom(), [atom()]) -> atom().
+best_match(Pattern, []) ->
+    Pattern;
+best_match(Pattern, Opts) ->
+    String = atom_to_list(Pattern),
+    {Ds, _} = lists:mapfoldl(
+		fun(Opt, Cache) ->
+			{Distance, Cache1} = ld(String, atom_to_list(Opt), Cache),
+			{{Distance, Opt}, Cache1}
+		end, #{}, Opts),
+    element(2, lists:min(Ds)).
+
 %%%===================================================================
 %%% Internal functions
 %%%===================================================================
@@ -485,3 +497,21 @@ get_dir(Type) ->
 unique_timestamp() ->
     {MS, S, _} = erlang:timestamp(),
     {MS, S, erlang:unique_integer([positive, monotonic]) rem 1000000}.
+
+%% Levenshtein distance
+-spec ld(string(), string(), map()) -> {non_neg_integer(), map()}.
+ld([] = S, T, Cache) ->
+    {length(T), maps:put({S, T}, length(T), Cache)};
+ld(S, [] = T, Cache) ->
+    {length(S), maps:put({S, T}, length(S), Cache)};
+ld([X|S], [X|T], Cache) ->
+    ld(S, T, Cache);
+ld([_|ST] = S, [_|TT] = T, Cache) ->
+    try {maps:get({S, T}, Cache), Cache}
+    catch _:{badkey, _} ->
+            {L1, C1} = ld(S, TT, Cache),
+            {L2, C2} = ld(ST, T, C1),
+            {L3, C3} = ld(ST, TT, C2),
+            L = 1 + lists:min([L1, L2, L3]),
+            {L, maps:put({S, T}, L, C3)}
+    end.