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D19081.id45736.diff
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diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -398,6 +398,7 @@
'ArcanistVariableVariableXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistVariableVariableXHPASTLinterRule.php',
'ArcanistVariableVariableXHPASTLinterRuleTestCase' => 'lint/linter/xhpast/rules/__tests__/ArcanistVariableVariableXHPASTLinterRuleTestCase.php',
'ArcanistVersionWorkflow' => 'workflow/ArcanistVersionWorkflow.php',
+ 'ArcanistWeldWorkflow' => 'workflow/ArcanistWeldWorkflow.php',
'ArcanistWhichWorkflow' => 'workflow/ArcanistWhichWorkflow.php',
'ArcanistWorkflow' => 'workflow/ArcanistWorkflow.php',
'ArcanistWorkingCopyIdentity' => 'workingcopyidentity/ArcanistWorkingCopyIdentity.php',
@@ -816,6 +817,7 @@
'ArcanistVariableVariableXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
'ArcanistVariableVariableXHPASTLinterRuleTestCase' => 'ArcanistXHPASTLinterRuleTestCase',
'ArcanistVersionWorkflow' => 'ArcanistWorkflow',
+ 'ArcanistWeldWorkflow' => 'ArcanistWorkflow',
'ArcanistWhichWorkflow' => 'ArcanistWorkflow',
'ArcanistWorkflow' => 'Phobject',
'ArcanistWorkingCopyIdentity' => 'Phobject',
diff --git a/src/workflow/ArcanistWeldWorkflow.php b/src/workflow/ArcanistWeldWorkflow.php
new file mode 100644
--- /dev/null
+++ b/src/workflow/ArcanistWeldWorkflow.php
@@ -0,0 +1,133 @@
+<?php
+
+final class ArcanistWeldWorkflow extends ArcanistWorkflow {
+
+ public function getWorkflowName() {
+ return 'weld';
+ }
+
+ public function getCommandSynopses() {
+ return phutil_console_format(<<<EOTEXT
+ **weld** [options] __file__ __file__ ...
+EOTEXT
+ );
+ }
+
+ public function getCommandHelp() {
+ return phutil_console_format(<<<EOTEXT
+ Robustly fuse two or more files together. The resulting joint is
+ much stronger than the one created by tools like __cat__.
+EOTEXT
+ );
+ }
+
+ public function getArguments() {
+ return array(
+ '*' => 'files',
+ );
+ }
+
+ public function run() {
+ $files = $this->getArgument('files');
+ if (count($files) < 2) {
+ throw new ArcanistUsageException(
+ 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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