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