forked from osmarks/potatOS
94 lines
3.1 KiB
Lua
94 lines
3.1 KiB
Lua
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-- see pastebin.com/NdUKJ07j for license info
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-- mostly written by SquidDev, bodged by gollark/osmarks
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local type = type
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local debug_traceback = type(debug) == "table" and type(debug.traceback) == "function" and debug.traceback
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local _pcall, _xpcall = pcall, xpcall
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local function traceback(x)
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-- Attempt to detect error() and error("xyz", 0).
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-- This probably means they're erroring the program intentionally and so we
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-- shouldn't display anything.
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if x == nil or (type(x) == "string" and not x:find(":%d+:")) or type(x) ~= "string" then
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return x
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end
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if debug_traceback then
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-- The parens are important, as they prevent a tail call occuring, meaning
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-- the stack level is preserved. This ensures the code behaves identically
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-- on LuaJ and PUC Lua.
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return (debug_traceback(tostring(x), 2))
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else
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local level = 3
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local out = { tostring(x), "stack traceback:" }
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while true do
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local _, msg = _pcall(error, "", level)
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if msg == "" then break end
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out[#out + 1] = " " .. msg
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level = level + 1
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end
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return table.concat(out, "\n")
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end
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end
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local function trim_traceback(target, marker)
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local target = tostring(target)
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local ttarget, tmarker = {}, {}
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for line in target:gmatch("([^\n]*)\n?") do ttarget[#ttarget + 1] = line end
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for line in marker:gmatch("([^\n]*)\n?") do tmarker[#tmarker + 1] = line end
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-- Trim identical suffixes
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local t_len, m_len = #ttarget, #tmarker
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while t_len >= 3 and ttarget[t_len] == tmarker[m_len] do
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table.remove(ttarget, t_len)
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t_len, m_len = t_len - 1, m_len - 1
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end
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-- Trim elements from this file and xpcall invocations
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while t_len >= 1 and ttarget[t_len]:find("^\tstack_trace%.lua:%d+:") or
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ttarget[t_len] == "\t[C]: in function 'xpcall'" or ttarget[t_len] == " xpcall: " do
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table.remove(ttarget, t_len)
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t_len = t_len - 1
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end
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return ttarget
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end
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--- Run a function with
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local function xpcall_with(fn, ...)
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local args = {...}
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-- So this is rather grim: we need to get the full traceback and current one and remove
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-- the common prefix
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local trace
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local res = table.pack(_xpcall(function() return fn(unpack(args)) end, traceback)) if not res[1] then trace = traceback("stack_trace.lua:1:") end
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local ok, err = res[1], res[2]
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if not ok and err ~= nil then
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trace = trim_traceback(err, trace)
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-- Find the position where the stack traceback actually starts
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local trace_starts
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for i = #trace, 1, -1 do
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if trace[i] == "stack traceback:" then trace_starts = i; break end
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end
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-- If this traceback is more than 15 elements long, keep the first 9, last 5
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-- and put an ellipsis between the rest
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local max = 15
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if trace_starts and #trace - trace_starts > max then
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local keep_starts = trace_starts + 10
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for i = #trace - trace_starts - max, 0, -1 do table.remove(trace, keep_starts + i) end
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table.insert(trace, keep_starts, " ...")
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end
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return false, table.concat(trace, "\n")
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end
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return table.unpack(res, 1, res.n)
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end
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_G.pcall = xpcall_with
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return xpcall_with
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