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ArcanistWeldWorkflow.php
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ArcanistWeldWorkflow.php

<?php
final class ArcanistWeldWorkflow
extends ArcanistWorkflow {
public function getWorkflowName() {
return 'weld';
}
public function getWorkflowInformation() {
$help = pht(<<<EOTEXT
Robustly fuse two or more files together. The resulting joint is much stronger
than the one created by tools like __cat__.
EOTEXT
);
return $this->newWorkflowInformation()
->addExample(pht('**weld** [__options__] __file__ __file__ ...'))
->setHelp($help);
}
public function getWorkflowArguments() {
return array(
$this->newWorkflowArgument('files')
->setIsPathArgument(true)
->setWildcard(true),
);
}
public function runWorkflow() {
$files = $this->getArgument('files');
if (count($files) < 2) {
throw new PhutilArgumentUsageException(
pht('Specify two or more files to weld together.'));
}
$buffer = array();
foreach ($files as $file) {
$data = Filesystem::readFile($file);
if (!strlen($data)) {
continue;
}
$lines = phutil_split_lines($data, true);
$overlap = mt_rand(16, 32);
if (count($buffer) > 6) {
$overlap = min($overlap, ceil(count($buffer) / 2));
}
if (count($lines) > 6) {
$overlap = min($overlap, ceil(count($lines) / 2));
}
$overlap = min($overlap, count($buffer));
$overlap = min($overlap, count($lines));
$buffer_len = count($buffer);
for ($ii = 0; $ii < $overlap; $ii++) {
$buffer[$buffer_len - $overlap + $ii] = $this->weldLines(
$buffer[$buffer_len - $overlap + $ii],
$lines[$ii],
($ii + 0.5) / $overlap);
}
for ($ii = $overlap; $ii < count($lines); $ii++) {
$buffer[] = $lines[$ii];
}
}
echo implode('', $buffer);
}
private function weldLines($u, $v, $bias) {
$newline = null;
$matches = null;
if (preg_match('/([\r\n]+)\z/', $u, $matches)) {
$newline = $matches[1];
}
if (preg_match('/([\r\n]+)\z/', $v, $matches)) {
$newline = $matches[1];
}
$u = rtrim($u, "\r\n");
$v = rtrim($v, "\r\n");
$u = phutil_utf8v_combined($u);
$v = phutil_utf8v_combined($v);
$len = max(count($u), count($v));
while (count($u) < $len) {
$u[] = ' ';
}
while (count($v) < $len) {
$v[] = ' ';
}
$rand_max = mt_getrandmax();
$result = array();
for ($ii = 0; $ii < $len; $ii++) {
$uc = $u[$ii];
$vc = $v[$ii];
$threshold = $bias;
if ($uc == ' ') {
$threshold = 1;
}
if ($vc == ' ') {
$threshold = 0;
}
if ((mt_rand() / $rand_max) > $threshold) {
$r = $uc;
} else {
$r = $vc;
}
$result[] = $r;
}
if ($newline !== null) {
$result[] = $newline;
}
return implode('', $result);
}
}

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