replace more Core cpp code with calls to helpdb

also document devel/dump-rpc builtin

docs/Builtin.rst

@@ -255,6 +255,17 @@ type
 ----
 ``type command`` shows where ``command`` is implemented.
 
+.. _devel/dump-rpc:
+
+devel/dump-rpc
+--------------
+
+Writes RPC endpoint information to the specified file.
+
+Usage::
+
+    devel/dump-rpc FILENAME
+
 Other Commands
 --------------
 The following commands are *not* built-in, but offer similarly useful functions.

library/LuaApi.cpp

@@ -148,6 +148,16 @@ void Lua::Push(lua_State *state, df::coord2d pos)
     lua_setfield(state, -2, "y");
 }
 
+void GetVector(lua_State *state, std::vector<std::string> &pvec)
+{
+    lua_pushnil(state);   // first key
+    while (lua_next(state, 1) != 0)
+    {
+        pvec.push_back(lua_tostring(state, -1));
+        lua_pop(state, 1);  // remove value, leave key
+    }
+}
+
 int Lua::PushPosXYZ(lua_State *state, df::coord pos)
 {
     if (!pos.isValid())

library/include/LuaTools.h

@@ -339,6 +339,8 @@ namespace DFHack {namespace Lua {
         }
     }
 
+    DFHACK_EXPORT void GetVector(lua_State *state, std::vector<std::string> &pvec);
+
     DFHACK_EXPORT int PushPosXYZ(lua_State *state, df::coord pos);
     DFHACK_EXPORT int PushPosXY(lua_State *state, df::coord2d pos);
 

library/lua/helpdb.lua

@@ -250,6 +250,7 @@ local BUILTINS = {
     alias='Configure helper aliases for other DFHack commands.',
     cls='Clear the console screen.',
     clear='Clear the console screen.',
+    ['devel/dump-rpc']='Write RPC endpoint information to a file.',
     die='Force DF to close immediately, without saving.',
     enable='Enable a plugin or persistent script.',
     disable='Disable a plugin or persistent script.',
@@ -575,15 +576,26 @@ function search_entries(include, exclude)
     ensure_db()
     include = normalize_filter(include)
     exclude = normalize_filter(exclude)
-    local commands = {}
-    for command in pairs(db) do
-        if (not include or matches(command, include)) and
-                (not exclude or not matches(command, exclude)) then
-            table.insert(commands, command)
+    local entries = {}
+    for entry in pairs(db) do
+        if (not include or matches(entry, include)) and
+                (not exclude or not matches(entry, exclude)) then
+            table.insert(entries, entry)
         end
     end
-    table.sort(commands, sort_by_basename)
-    return commands
+    table.sort(entries, sort_by_basename)
+    return entries
+end
+
+-- returns a list of all commands. used by Core's autocomplete functionality.
+function get_commands()
+    local include = {types={ENTRY_TYPES.COMMAND}}
+    return search_entries(include)
+end
+
+function is_builtin(command)
+    ensure_db()
+    return db[command] and db[command].entry_types[ENTRY_TYPES.BUILTIN]
 end
 
 ---------------------------------------------------------------------------
@@ -633,7 +645,7 @@ function list_entries(skip_tags, include, exclude)
         end
     end
     if #entries == 0 then
-        print('no entries found.')
+        print('No matches.')
     end
 end