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PhutilArgumentWorkflow.php
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Fri, Apr 4, 12:07

PhutilArgumentWorkflow.php
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<?php
/**
* Used with @{class:PhutilArgumentParser} to build command line tools which
* operate in several modes, called "workflows", like `git`, `svn`, `arc`,
* `apt-get`. For example, you might build a simple calculator like this:
*
* name=scripts/example/calculator.php
* $args = new PhutilArgumentParser($argv);
* $args->setTagline('simple calculator example');
* $args->setSynopsis(<<<EOHELP
* **calculator.php** __op__ __n__ ...
* Perform a calculation.
* EOHELP
* );
*
* $add_workflow = id(new PhutilArgumentWorkflow())
* ->setName('add')
* ->setExamples('**add** __n__ ...')
* ->setSynopsis('Compute the sum of a list of numbers.')
* ->setArguments(
* array(
* array(
* 'name' => 'numbers',
* 'wildcard' => true,
* ),
* ));
*
* $mul_workflow = id(new PhutilArgumentWorkflow())
* ->setName('mul')
* ->setExamples('**mul** __n__ ...')
* ->setSynopsis('Compute the product of a list of numbers.')
* ->setArguments(
* array(
* array(
* 'name' => 'numbers',
* 'wildcard' => true,
* ),
* ));
*
* $flow = $args->parseWorkflows(
* array(
* $add_workflow,
* $mul_workflow,
* new PhutilHelpArgumentWorkflow(),
* ));
*
* $nums = $args->getArg('numbers');
* if (empty($nums)) {
* echo "You must provide one or more numbers!\n";
* exit(1);
* }
*
* foreach ($nums as $num) {
* if (!is_numeric($num)) {
* echo "Number '{$num}' is not numeric!\n";
* exit(1);
* }
* }
*
* switch ($flow->getName()) {
* case 'add':
* echo array_sum($nums)."\n";
* break;
* case 'mul':
* echo array_product($nums)."\n";
* break;
* }
*
* You can also subclass this class and return `true` from
* @{method:isExecutable}. In this case, the parser will automatically select
* your workflow when the user invokes it.
*
* @stable
* @concrete-extensible
*/
class PhutilArgumentWorkflow {
private $name;
private $synopsis;
private $specs = array();
private $examples;
private $help;
final public function __construct() {
$this->didConstruct();
}
public function setName($name) {
$this->name = $name;
return $this;
}
public function getName() {
return $this->name;
}
/**
* Provide brief usage examples of common calling conventions, like:
*
* $workflow->setExamples("**delete** __file__ [__options__]");
*
* This text is shown in both brief and detailed help, and should give the
* user a quick reference for common uses. You can separate several common
* uses with newlines, but usually should not provide more than 2-3 examples.
*/
final public function setExamples($examples) {
$this->examples = $examples;
return $this;
}
final public function getExamples() {
if (!$this->examples) {
return '**'.$this->name.'**';
}
return $this->examples;
}
/**
* Provide a brief description of the command, like "Delete a file.".
*
* This text is shown in both brief and detailed help, and should give the
* user a general idea of what the workflow does.
*/
final public function setSynopsis($synopsis) {
$this->synopsis = $synopsis;
return $this;
}
final public function getSynopsis() {
return $this->synopsis;
}
/**
* Provide a full explanation of the command. This text is shown only in
* detailed help.
*/
final public function getHelp() {
return $this->help;
}
final public function setHelp($help) {
$this->help = $help;
return $this;
}
final public function setArguments(array $specs) {
$specs = PhutilArgumentSpecification::newSpecsFromList($specs);
$this->specs = $specs;
return $this;
}
final public function getArguments() {
return $this->specs;
}
protected function didConstruct() {
return null;
}
public function isExecutable() {
return false;
}
public function execute(PhutilArgumentParser $args) {
throw new Exception("This workflow isn't executable!");
}
/**
* Normally, workflow arguments are parsed fully, so unexpected arguments will
* raise an error. You can return `true` from this method to parse workflow
* arguments only partially. This will allow you to manually parse remaining
* arguments or delegate to a second level of workflows.
*
* @return bool True to partially parse workflow arguments (default false).
*/
public function shouldParsePartial() {
return false;
}
}

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