First commit!

diff --git a/README.md b/README.md
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+Auto CAS user
+=============
+
+Automatically create a CAS user that corresponds to the Drupal account
+with the same name upon first login.

diff --git a/auto_cas_user.info b/auto_cas_user.info
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+name = Auto CAS User
+description = Automatically creates CAS users that correspond to Drupal usernames.
+core = 7.x
+package = Central Authentication Service
+dependencies[] = cas

diff --git a/auto_cas_user.module b/auto_cas_user.module
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+<?php
+
+function auto_cas_user_cas_user_alter(&$cas_user) {
+  $username = $cas_user['name'];
+
+  // Test for existing CAS user
+  $count = db_select('cas_user', 'c')
+    ->condition('cas_name', $username)
+    ->countQuery()->execute()->fetchfield();
+
+  if($count == 0) {
+    $account = user_load_by_name($username);
+
+    if($account) {
+      // User exists but doesn't have a CAS user record, so create
+      // one.
+      db_insert('cas_user')
+        ->fields(array('cas_name' => $username,
+                       'uid' => $account->uid))
+        ->execute();
+    }
+  }
+}
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