Static analysis of Lua 5.1/5.2/5.3 source, finding all global references and making them local

analyzelua.sh

# Based on http://lua-users.org/wiki/DetectingUndefinedVariables, but extended to automate the code generation.

# Lua 5.1
for f in *.lua; do luac-5.1 -p -l "$f" | grep ETGLOBAL | cut -d ';' -f 2 | sort | uniq | sed -E 's/^ (.+)$/local \1 = \1;/' > "_globals.${f}.txt"; done

# Lua 5.2 and 5.3
for f in *.lua; do luac-5.3 -p -l "$f" | grep 'ETTABUP.*_ENV' | cut -d ';' -f 2 | cut -d ' ' -f 1-3 | sort | uniq | sed -E 's/^ _ENV "(.+)"\s*$/local \1 = \1;/' > "_globals.${f}.txt"; done

# The resulting log files will be overzealous (any non-"local"-declared vars from the same file will be seen as globals),
# so you'll still have to do manual work to remove the things that aren't necessary. But it's a lot better than doing
# all of this work manually, trudging through thousands of lines of code to find all external function calls... hehe!