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grep is a Unix command that searches through files looking for lines that match a supplied regular expression. If you re a Windows user and would like to follow along with these examples, you can use grep by installing a precompiled version (see http://unxutils.sourceforge.net) or by installing the Cygwin environment (http://cygwin.com). Otherwise, you can just use the built-in search functionality of the operating system rather than grep. grep is a handy tool when looking for the implementation of hooks within Drupal core, finding the place where error messages are being built, and so on. Let s look at some examples of using grep from within the Drupal root directory: $ grep -rl 'hook_init' . ./authorize.php ./includes/common.inc ./modules/simpletest/tests/system_test.module ./modules/simpletest/tests/theme_test.module ./modules/simpletest/tests/theme.test ./modules/simpletest/tests/actions_loop_test.module ./modules/locale/locale.module ./modules/dblog/dblog.module ./modules/update/update.module ./modules/system/system.api.php ./modules/system/system.module ./modules/overlay/overlay.install ./modules/overlay/overlay.module ./update.php ./themes/engines/phptemplate/phptemplate.engine

NSEntityDescription *point = [[managedObjectModel entitiesByName] objectForKey:@"Point"]; [point setRenamingIdentifier:@"Vertex"];

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In the preceding case, we are recursively searching (-r) our Drupal files for instances of hook_init starting at the current directory (.) and printing out the file names (-l) of the matching instances. Now look at this example: $ grep -rn 'hook_init' . ./authorize.php:31: * avoid various unwanted operations, such as hook_init() and ./includes/common.inc:2697: * drupal_add_css() in a hook_init() implementation. ./includes/common.inc:2750: * theme .info files. Modules that add stylesheets within hook_init() ./includes/common.inc:3770: * drupal_add_css() in a hook_init() implementation. ./includes/common.inc:3810: * hook_init() implementations, or from other code that ensures that the ./includes/common.inc:4829: // Initialize $_GET['q'] prior to invoking hook_init(). ./includes/common.inc:4835: // Prior to invoking hook_init(), initialize the theme (potentially a custom ./includes/common.inc:4837: // - Modules with hook_init() implementations that call theme() or ./modules/simpletest/tests/system_test.module:184: * Implements hook_init(). Here, we are recursively searching (-r) our Drupal files for instances of the string hook_init and printing out the actual lines and line numbers (-n) where they occur. We could further refine our search by piping results into another search. In the following example, we search for occurrences of the word poll in the previous example s search result set: $grep -rn 'hook_init' . | grep 'dblog' ./modules/dblog/dblog.module:88: * Implements hook_init(). Another way to refine your search is by using the -v flag for grep, which means invert this match ; that is, let matches through that do not match the string. Let s find all the occurrences of the word lock without matching the words block or Block: $ grep -rn 'lock' . | grep -v '[B|b]lock' ./includes/common.inc:2548: // See if the semaphore is still locked. ./includes/database.mysql.inc:327:function db_lock_table($table) { ./includes/database.mysql.inc:332: * Unlock all locked tables. ...

Figure 9-20. Validating the minutes section of the date string Finally, repeat the pattern for the minutes to match the seconds, and then use the dollar sign modifier to match the end of the string: /^(\d{4}(-\d{2}){2} (\d{2})(:\d{2}){2})$/ (see Figure 9-21).

Summary

Core Data takes care of migrating the data, but you still have the responsibility to update any code in your application that depends on the old name. To see this in practice, create a new version of your data model. You should now be on version 4 (Shapes 4). In this version of the model, you ll rename the Vertex entity to Point. Go to your new model file, Shapes 4.xcdatamodel, and rename the Vertex entity to Point. Then, go to the Versioning section in the Configurations tab, and type the old name, Vertex, into the renaming identifier field so that Core Data will know how to migrate the existing data, as Figure 8-5 shows, and save this model.

After reading this chapter, you should be able to Code according to Drupal coding conventions. Document your code so that your comments can be reused by the API module. Comfortably search through Drupal s code base using grep. Identify Drupal coding ninjas by their best practices.

Wait! Before running the application, remember that you re responsible for changing any code that relies on the old name, Vertex. You could change the custom managed object class name from Vertex to Point, change the relationship name in the Polygon entity from vertices to points, change any variable names appropriately, but we ll keep it simple here and change the one place the Shapes application refers to the Vertex entity name. You find it in Polygon.m in the call to [NSEntityDescription insertNewObjectForEntityForName]. It currently reads as follows:

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