27 lines
1 KiB
Bash
Executable file
27 lines
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) trim blank lines
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# (4) sort the results, mostly so I have an idea how far along the process is
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# (5) for each result:
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# (6) grep for the constant
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# (7) use awk to to check if only one match for a given constant was found
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# (8) if so, generate a sed command to remove the #define
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#
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git grep -P '^#define\s+\w+\s+\w' -- "[!e][!x][!t]*" \
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| cut -s -d ' ' -f 2 \
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| sed '/^$/d' \
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| sort \
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| xargs -Ixxx 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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