30 lines
1.1 KiB
Bash
Executable file
30 lines
1.1 KiB
Bash
Executable file
#
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# This is a pretty brute-force approach. It takes several hours to run on a top-spec MacbookAir.
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# It also produces some false positives, so it requires careful examination and testing of the results.
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#
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# Algorithm Summary:
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# First we find all #defines,
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# then we search for each of them in turn,
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# and if we find only one instance of a #define, we print it out.
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#
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# Algorithm Detail:
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# (1) find #defines, excluding the externals folder
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# (2) extract just the constant name from the search results
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# (3) sort and uniq the results, mostly so I have an idea how far along the process is
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# (4) for each result:
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# (5) grep for the constant
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# (6) use awk to to check if only one match for a given constant was found
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# (7) if so, generate a sed command to remove the #define
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#
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( git grep -hP '^\w*#define\s+\w+.*\\' -- "[!e][!x][!t]*" \
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&& \
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git grep -hP '^\w*#define\s+\w+\s*$' -- "[!e][!x][!t]*" ) \
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| sed -r 's/[ ]*#define[ ]+([a-zA-Z0-9_]+).*/\1/' \
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| grep -v '_idl' \
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| grep -vE '^INCLUDED_' \
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| sort \
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| uniq \
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| xargs -Ixxx -n 1 -P 8 sh -c \
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"git grep -w 'xxx' | awk -f bin/find-unused-defines.awk -v p1=xxx && echo \"xxx\" 1>&2"
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