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48 lines
1.5 KiB
Lua
48 lines
1.5 KiB
Lua
-- trace package loading flow with require call
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-- usage: ./luajit -ltools/trace_require reader.lua ../../test
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local math = require("math")
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local _require = require
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local loaded_modules = {}
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local highlight = "*"
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-- timing threshold for highlight annotation
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local threshold = 0.001
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-- whether to trace loaded packages
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local trace_loaded = false
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local indent = string.rep(" ", 4)
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local level = 0
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function require(module)
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level = level + 1
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local x = os.clock()
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local info = debug.getinfo(2)
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-- this is a protected call of require
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if info.short_src == "[C]" then
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info = debug.getinfo(3)
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end
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local loaded = loaded_modules[module]
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if not loaded then
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print(string.format("%s%s:%s => %s",
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indent:rep(level), info.short_src, info.currentline, module))
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elseif trace_loaded then
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print(string.format("%s%s:%s -> %s",
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indent:rep(level), info.short_src, info.currentline, module))
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end
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-- protect require call in case we cannot raise call level when errors happen
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local ok, loaded_module = pcall(_require, module)
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if not ok then
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level = level - 1
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error(loaded_module)
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end
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local elapse = os.clock() - x
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local annot = highlight:rep(math.ceil(math.log10(elapse/threshold))) or ""
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if not loaded then
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print(string.format("%s%s loading time: %.3f",
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annot .. indent:rep(level):sub(#annot + 1), module, elapse))
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end
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loaded_modules[module] = true
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level = level - 1
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return loaded_module
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end
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