your-land/cmd_eval
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use coroutine to get a clean stack trace

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This commit is contained in:
whosit 2024-12-08 16:54:12 +03:00
parent 4b981f3482
commit 5c8e627bd6
1 changed files with 13 additions and 4 deletions
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15
init.lua
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@ -12,11 +12,13 @@ core.register_chatcommand("eval",
-- echo input back
core.chat_send_player(name, "> " .. code)
local func, err = loadstring(code, "usercode")
local func, err = loadstring(code, "code")
if not func then
return false, err
end
local coro = coroutine.create(func)
local ok
local helper = function(...)
-- We need this helper to access returned values
@ -33,8 +35,13 @@ core.register_chatcommand("eval",
local res = {...}
ok = res[1]
if n == 2 then
-- returned single value or error - just return it
-- returned single value or error
if ok then
return dump(res[2])
else
-- combine returned error and stack trace
return string.format("%s\n%s", res[2], debug.traceback(coro))
end
else
-- returned multiple values: display one per line
local ret_vals = {}
@ -44,7 +51,9 @@ core.register_chatcommand("eval",
return table.concat(ret_vals, ',\n')
end
end
local res = helper(pcall(func))
-- Creating a coroutine here, instead of using xpcall,
-- allows us to get a clean stack trace up to this call.
local res = helper(coroutine.resume(coro))
return ok, res
end
}