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VersionControl_SVN

VersionControl_SVN is a simple Object-Oriented interface for the svn command-line application that makes up the core of Subversion, a free/open-source version control system.

Introduction

Subversion can be used to manage trees of source code, text files, image files -- just about any collection of files.

VersionControl_SVN's features include:

The power of a version control system like Subversion, when accessed through VersionControl_SVN, can be extended far beyond typical "source code" repositories.

For example, what content management system (CMS) couldn't benefit from version control functionality? For many non-programmers, version control is a confusing subject to get a firm grasp on. With VersionControl_SVN, developers are now able to customize the interface to Subversion with the ease-of-use goals of their particular audience in mind. VersionControl_SVN lets you leverage the strengths of version control without burdening end-users with the learning curve of change control fundamentals.

A Simple Example

So you've got Subversion repository set up somewhere, and you want to take a look at what's inside with a PHP script. With the VersionControl_SVN::VersionControl_SVN_List() command, you're just a few steps away.

Example 58-1. Reading the content of a Subversion repository 

require_once 'VersionControl/SVN.php';
    
// Setup error handling -- always a good idea!
$svnstack = &PEAR_ErrorStack::singleton('VersionControl_SVN');

// Set up runtime options. 
$options = array('fetchmode' => VERSIONCONTROL_SVN_FETCHMODE_ARRAY);
// Request list class from factory
$svn = VersionControl_SVN::factory('list', $options);

// Define any switches and aguments we may need
$switches = array('username' => 'user', 'password' => 'pass');
$args = array('svn://svn.example.com/repos/TestProject');

// Run command
if ($output = $svn->run($args, $switches)) {
    print_r($output);
} else {
    if (count($errs = $svnstack->getErrors())) { 
        foreach ($errs as $err) {
            echo '<br />'.$err['message']."<br />\n";
            echo "Command used: " . $err['params']['cmd'];
        }
    }
}

If your example repository above happened to have the VersionControl_SVN source in it, your output would be something like this: 

Array
(
    [0] => Array
        (
            [name] => docs
            [type] => D
        )

    [1] => Array
        (
            [name] => package.xml
            [type] => F
        )

    [2] => Array
        (
            [name] => SVN.php
            [type] => F
        )

    [3] => Array
        (
            [name] => SVN
            [type] => D
        )

    [4] => Array
        (
            [name] => tests
            [type] => D
        )

)

Note that in the above output, directories are flagged as type D, and files are flagged as type F.

Note: For additional information in the output, try setting verbose to TRUE in your $options array.

One Factory To Rule Them All

Have a script that needs to utilize several VersionControl_SVN subclasses? At the expense of a little overhead, you can be sure your $svn objects are fully-loaded by using the VersionControl_SVN::factory() command keyword __ALL__.

For example, in a basic script to get the list of current files in a repository, you just need the VersionControl_SVN::VersionControl_SVN_List() subclass.

Example 58-2. Getting the list of current files in a repository

require_once 'VersionControl/SVN.php';

// Setup error handling -- always a good idea!
$svnstack = &PEAR_ErrorStack::singleton('VersionControl_SVN');

// Set up runtime options. 
$options = array('fetchmode' => VERSIONCONTROL_SVN_FETCHMODE_ARRAY);

// Request list class from factory
$svn = VersionControl_SVN::factory('list', $options);

// Define any switches and aguments we may need
$switches = array('username' => 'user', 'password' => 'pass');
$args = array('svn://svn.example.com/repos/TestProject');

// Run command
if ($output = $svn->run($args, $switches)) {
    print_r($output);
} else {
    if (count($errs = $svnstack->getErrors())) { 
        foreach ($errs as $err) {
            echo '<br />'.$err['message']."<br />\n";
            echo "Command used: " . $err['params']['cmd'];
        }
    }
}

However, if you need to get a recursive list of files in a repository, look up the recent log activity for those files, and view the annotated source for those files, you've got two options.

Example 58-3. Recursively getting the list of current files in a repository

require_once 'VersionControl/SVN.php';

// Setup error handling -- always a good idea!
$svnstack = &PEAR_ErrorStack::singleton('VersionControl_SVN');

// Set up runtime options. 
$options = array('fetchmode' => VERSIONCONTROL_SVN_FETCHMODE_RAW);

// METHOD ONE: Lowest Overhead
// Create svn object with subcommands we need listed out individually
$svn = VersionControl_SVN::factory(array('list', 'log', 'blame'), $options);

// Define any switches and aguments we may need
$switches = array('username' => 'user', 'password' => 'pass');
$args = array('svn://svn.example.com/repos/TestProject');

print_r($svn->list->run($args, $switches));

// Pick files out of the above output, and see who did what
$args = array('svn://svn.example.com/repos/TestProject/trunk/index.php');

echo "<pre>" . $svn->blame->run($args) . "</pre>";

// METHOD TWO: Put all available commands at your disposal
// Load up all subcommands - higher overhead, but convenient for certain occasions
$svn = VersionControl_SVN::factory('__ALL__', $options);

// Now you may run whatever you need to ...
$svn->cat->run($args, $switches);
$svn->info->run($args, $switches);
// ... and so on.

Further Reading

If you are interested in learning more about Subversion, see the following:

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