util._matcher: speed up regexp matching.
In 4babaa52badf, Benoit made a change that substantially slows matching
when a big .hgignore file is in play, because it calls into the regexp
matching engine potentially hundreds of times per file to be matched.
I've partly rolled back his change, so that we only call into the matcher
once per file, but preserved the ability to report a meaningful error
message if there's a syntax error in the regexp.
#!/bin/sh
# GNU diff is the reference for all of these results.
hgdiff() {
hg diff --nodates "$@"
}
test_added_blank_lines() {
printf '\nhello world\n\ngoodbye world\n\n' >foo
echo '>>> two diffs showing three added lines <<<'
hgdiff
hgdiff -b
echo '>>> no diffs <<<'
hgdiff -B
hgdiff -Bb
}
test_added_horizontal_space_first_on_a_line() {
printf '\t hello world\ngoodbye world\n' >foo
echo '>>> four diffs showing added space first on the first line <<<'
hgdiff
hgdiff -b
hgdiff -B
hgdiff -Bb
}
test_added_horizontal_space_last_on_a_line() {
printf 'hello world\t \ngoodbye world\n' >foo
echo '>>> two diffs showing space appended to the first line <<<'
hgdiff
hgdiff -B
echo '>>> no diffs <<<'
hgdiff -b
hgdiff -Bb
}
test_added_horizontal_space_in_the_middle_of_a_word() {
printf 'hello world\ngood bye world\n' >foo
echo '>>> four diffs showing space inserted into "goodbye" <<<'
hgdiff
hgdiff -B
hgdiff -b
hgdiff -Bb
}
test_increased_horizontal_whitespace_amount() {
printf 'hello world\ngoodbye\t\t \tworld\n' >foo
echo '>>> two diffs showing changed whitespace amount in the last line <<<'
hgdiff
hgdiff -B
echo '>>> no diffs <<<'
hgdiff -b
hgdiff -Bb
}
test_added_blank_line_with_horizontal_whitespace() {
printf 'hello world\n \t\ngoodbye world\n' >foo
echo '>>> four diffs showing added blank line w/horizontal space <<<'
hgdiff
hgdiff -B
hgdiff -b
hgdiff -Bb
}
hg init
printf 'hello world\ngoodbye world\n' >foo
hg ci -Amfoo -ufoo -d '0 0'
test_added_blank_lines
test_added_horizontal_space_first_on_a_line
test_added_horizontal_space_last_on_a_line
test_added_horizontal_space_in_the_middle_of_a_word
test_increased_horizontal_whitespace_amount
test_added_blank_line_with_horizontal_whitespace