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-rwxr-xr-xt/perf/p4220-log-grep-engines.sh54
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+#!/bin/sh
+
+test_description="Comparison of git-log's --grep regex engines
+
+Set GIT_PERF_4220_LOG_OPTS in the environment to pass options to
+git-grep. Make sure to include a leading space,
+e.g. GIT_PERF_4220_LOG_OPTS=' -i'. Some options to try:
+
+ -i
+ --invert-grep
+ -i --invert-grep
+"
+
+. ./perf-lib.sh
+
+test_perf_large_repo
+test_checkout_worktree
+
+for pattern in \
+ 'how.to' \
+ '^how to' \
+ '[how] to' \
+ '\(e.t[^ ]*\|v.ry\) rare' \
+ 'm\(ú\|u\)lt.b\(æ\|y\)te'
+do
+ for engine in basic extended perl
+ do
+ if test $engine != "basic"
+ then
+ # Poor man's basic -> extended converter.
+ pattern=$(echo $pattern | sed 's/\\//g')
+ fi
+ if test $engine = "perl" && ! test_have_prereq PCRE
+ then
+ prereq="PCRE"
+ else
+ prereq=""
+ fi
+ test_perf "$engine log$GIT_PERF_4220_LOG_OPTS --grep='$pattern'" \
+ --prereq "$prereq" "
+ git -c grep.patternType=$engine log --pretty=format:%h$GIT_PERF_4220_LOG_OPTS --grep='$pattern' >'out.$engine' || :
+ "
+ done
+
+ test_expect_success "assert that all engines found the same for$GIT_PERF_4220_LOG_OPTS '$pattern'" '
+ test_cmp out.basic out.extended &&
+ if test_have_prereq PCRE
+ then
+ test_cmp out.basic out.perl
+ fi
+ '
+done
+
+test_done