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phab/src/applications/diffusion/data/DiffusionGitBranch.php
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DiffusionGitBranch.php
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<?php
final class DiffusionGitBranch {
const DEFAULT_GIT_REMOTE = 'origin';
/**
* Parse the output of 'git branch -r --verbose --no-abbrev' or similar into
* a map. For instance:
*
* array(
* 'origin/master' => '99a9c082f9a1b68c7264e26b9e552484a5ae5f25',
* );
*
* If you specify $only_this_remote, branches will be filtered to only those
* on the given remote, **and the remote name will be stripped**. For example:
*
* array(
* 'master' => '99a9c082f9a1b68c7264e26b9e552484a5ae5f25',
* );
*
* @param string stdout of git branch command.
* @param string Filter branches to those on a specific remote.
* @return map Map of 'branch' or 'remote/branch' to hash at HEAD.
*/
public static function parseRemoteBranchOutput(
$stdout,
$only_this_remote = null) {
$map = array();
$lines = array_filter(explode("\n", $stdout));
foreach ($lines as $line) {
$matches = null;
if (preg_match('/^ (\S+)\s+-> (\S+)$/', $line, $matches)) {
// This is a line like:
//
// origin/HEAD -> origin/master
//
// ...which we don't currently do anything interesting with, although
// in theory we could use it to automatically choose the default
// branch.
continue;
}
if (!preg_match('/^ *(\S+)\s+([a-z0-9]{40})/', $line, $matches)) {
throw new Exception("Failed to parse {$line}!");
}
$remote_branch = $matches[1];
$branch_head = $matches[2];
if (strpos($remote_branch, 'HEAD') !== false) {
// let's assume that no one will call their remote or branch HEAD
continue;
}
if ($only_this_remote) {
$matches = null;
if (!preg_match('#^([^/]+)/(.*)$#', $remote_branch, $matches)) {
throw new Exception(
"Failed to parse remote branch '{$remote_branch}'!");
}
$remote_name = $matches[1];
$branch_name = $matches[2];
if ($remote_name != $only_this_remote) {
continue;
}
$map[$branch_name] = $branch_head;
} else {
$map[$remote_branch] = $branch_head;
}
}
return $map;
}
/**
* As above, but with no `-r`. Used for bare repositories.
*/
public static function parseLocalBranchOutput($stdout) {
$map = array();
$lines = array_filter(explode("\n", $stdout));
$regex = '/^[* ]*(\(no branch\)|\S+)\s+([a-z0-9]{40})/';
foreach ($lines as $line) {
$matches = null;
if (!preg_match($regex, $line, $matches)) {
throw new Exception("Failed to parse {$line}!");
}
$branch = $matches[1];
$branch_head = $matches[2];
if ($branch == '(no branch)') {
continue;
}
$map[$branch] = $branch_head;
}
return $map;
}
}
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