Add ability to pass command-line arguments to a Lua script.

Introduce `ScriptCommand` class that parses a command line into a script name
and optional args, using bash-like quoting and escaping. `ScriptCommand`
searches for a file with that script name on a passed list of directories; the
directories may be specified relative to a particular base directory.

`ScriptCommand` supports the special case of a script name containing unescaped
spaces. It guarantees that either the returned script file exists, or its
`error()` string is non-empty.

Replace `LLLeap::create()` logic, from which `ScriptCommand` was partly
derived, with a `ScriptCommand` instance.

Make `LLLUAmanager::runScriptFile()` use a `ScriptCommand` instance to parse
the passed command line.

Subsume `LLAppViewer::init()` script-path-searching logic for `--luafile`
into `ScriptCommand`. In fact that lambda now simply calls
`LLLUAmanager::runScriptFile()`.

Make `lluau::dostring()` accept an optional vector of script argument strings.
Following PUC-Rio Lua convention, pass these arguments into a Lua script as
the predefined global `arg`, and also as the script's `...` argument.
`LuaState::expr()` also accepts and passes through script argument strings.

Change the log tag for the Lua script interruption message: if we want it, we
can still enable it, but we don't necessarily want it along with all other
"Lua" DEBUG messages.

Remove `LuaState::script_finished_fn`, which isn't used any more. Also remove
the corresponding `LLLUAmanager::script_finished_fn`. This allows us to
simplify `~LuaState()` slightly, as well as the parameter signatures for
`LLLUAmanager::runScriptFile()` and `runScriptLine()`.

1 files changed, 2 insertions, 0 deletions

diff --git a/indra/llcommon/CMakeLists.txt b/indra/llcommon/CMakeLists.txt
index f47136f781..9b99d86434 100644
--- a/indra/llcommon/CMakeLists.txt
+++ b/indra/llcommon/CMakeLists.txt
@@ -108,6 +108,7 @@ set(llcommon_SOURCE_FILES
     lua_function.cpp
     lualistener.cpp
     resultset.cpp
+    scriptcommand.cpp
     threadpool.cpp
     throttle.cpp
     u64.cpp
@@ -257,6 +258,7 @@ set(llcommon_HEADER_FILES
     lua_function.h
     lualistener.h
     resultset.h
+    scriptcommand.h
     stdtypes.h
     stringize.h
     tempset.h