Initial Commit

1 files changed, 716 insertions, 0 deletions

diff --git a/editcode.inc b/editcode.inc
new file mode 100755
index 0000000..932ce96
--- /dev/null
+++ b/editcode.inc
@@ -0,0 +1,716 @@
+<?php
+// $Id$
+/******************************************************************************/
+/***************************** EDIT EXAMPLE ***********************************/
+/******************************************************************************/
+function upload_examples_edit_form($form, &$form_state)
+  {
+    global $user;
+    $example_id = arg(3);
+    /* get example details */
+    /*$example_q = db_query("SELECT * FROM {textbook_companion_example} WHERE id = %d LIMIT 1", $example_id);
+    $example_data = db_fetch_object($example_q);*/
+    $query = db_select('textbook_companion_example');
+    $query->fields('textbook_companion_example');
+    $query->condition('id', $example_id);
+    $query->range(0, 1);
+    $example_q = $query->execute();
+    $example_data = $example_q->fetchObject();
+    if (!$example_q)
+      {
+        drupal_set_message(t("Invalid example selected."), 'error');
+        drupal_goto('');
+        return;
+      }
+    if ($example_data->approval_status != 0)
+      {
+        drupal_set_message(t("You cannot edit an example after it has been approved or dis-approved. Please contact site administrator if you want to edit this example."), 'error');
+        drupal_goto('');
+        return;
+      }
+    /* get examples files */
+    $source_file = "";
+    $source_id = 0;
+    $result1_file = "";
+    $result1_id = 0;
+    $result2_file = "";
+    $result2_id = 0;
+    $xcos1_file = "";
+    $xcos1_id = 0;
+    $xcos2_file = "";
+    $xcos2_id = 0;
+    /*$example_files_q = db_query("SELECT * FROM {textbook_companion_example_files} WHERE example_id = %d", $example_id);*/
+    $query = db_select('textbook_companion_example_files');
+    $query->fields('textbook_companion_example_files');
+    $query->condition('example_id', $example_id);
+    $example_files_q = $query->execute();
+    while ($example_files_data = $example_files_q->fetchObject())
+      {
+        if ($example_files_data->filetype == "S")
+          {
+            $source_file = l($example_files_data->filename, 'textbook-companion/download/file/' . $example_files_data->id);
+            $source_file_id = $example_files_data->id;
+            //var_dump($source_file);die;
+          }
+      }
+    /* get chapter details */
+    /*$chapter_q = db_query("SELECT * FROM {textbook_companion_chapter} WHERE id = %d", $example_data->chapter_id);
+    $chapter_data = db_fetch_object($chapter_q);*/
+    $query = db_select('textbook_companion_chapter');
+    $query->fields('textbook_companion_chapter');
+    $query->condition('id', $example_data->chapter_id);
+    $result = $query->execute();
+    $chapter_data = $result->fetchObject();
+    if (!$chapter_data)
+      {
+        drupal_set_message(t("Invalid chapter selected."), 'error');
+        drupal_goto('');
+        return;
+      }
+    /* get preference details */
+    /*$preference_q = db_query("SELECT * FROM {textbook_companion_preference} WHERE id = %d", $chapter_data->preference_id);
+    $preference_data = db_fetch_object($preference_q);*/
+    $query = db_select('textbook_companion_preference');
+    $query->fields('textbook_companion_preference');
+    $query->condition('id', $chapter_data->preference_id);
+    $result = $query->execute();
+    $preference_data = $result->fetchObject();
+    if (!$preference_data)
+      {
+        drupal_set_message(t("Invalid book selected."), 'error');
+        drupal_goto('');
+        return;
+      }
+    if ($preference_data->approval_status != 1)
+      {
+        drupal_set_message(t("Cannot edit example. Either the book proposal has not been approved or it has been rejected."), 'error');
+        drupal_goto('');
+        return;
+      }
+    /* get proposal details */
+    /*$proposal_q = db_query("SELECT * FROM {textbook_companion_proposal} WHERE id = %d", $preference_data->proposal_id);
+    $proposal_data = db_fetch_object($proposal_q);*/
+    $query = db_select('textbook_companion_proposal');
+    $query->fields('textbook_companion_proposal');
+    $query->condition('id', $preference_data->proposal_id);
+    $result = $query->execute();
+    $proposal_data = $result->fetchObject();
+    if (!$proposal_data)
+      {
+        drupal_set_message(t("Invalid proposal selected."), 'error');
+        drupal_goto('');
+        return;
+      }
+    if ($proposal_data->uid != $user->uid)
+      {
+        drupal_set_message(t("You do not have permissions to edit this example."), 'error');
+        drupal_goto('');
+        return;
+      }
+    $user_data = user_load($proposal_data->uid);
+    $form['#redirect'] = 'textbook-companion/code';
+    $form['#attributes'] = array(
+        'enctype' => "multipart/form-data"
+    );
+    $form['book_details']['book'] = array(
+        '#type' => 'item',
+        '#markup' => $preference_data->book,
+        '#title' => t('Title of the Book')
+    );
+    $form['contributor_name'] = array(
+        '#type' => 'item',
+        '#markup' => $proposal_data->full_name,
+        '#title' => t('Contributor Name')
+    );
+    $form['number'] = array(
+        '#type' => 'item',
+        '#title' => t('Chapter No'),
+        '#markup' => $chapter_data->number
+    );
+    $form['name'] = array(
+        '#type' => 'item',
+        '#title' => t('Title of the Chapter'),
+        '#markup' => $chapter_data->name
+    );
+    $form['example_number'] = array(
+        '#type' => 'item',
+        '#title' => t('Example No'),
+        '#markup' => $example_data->number
+    );
+    $form['example_caption'] = array(
+        '#type' => 'textfield',
+        '#title' => t('Caption'),
+        '#size' => 40,
+        '#maxlength' => 255,
+        '#required' => TRUE,
+        '#default_value' => $example_data->caption
+    );
+    $form['example_warning'] = array(
+        '#type' => 'item',
+        '#title' => t('You should upload all the files (main or source files, result files, executable file if any)'),
+        '#prefix' => '<div style="color:red">',
+        '#suffix' => '</div>'
+    );
+    $form['sourcefile'] = array(
+        '#type' => 'fieldset',
+        '#title' => t('Main or Source Files'),
+        '#collapsible' => FALSE,
+        '#collapsed' => FALSE
+    );
+    if ($source_file)
+      {
+        $form['sourcefile']['cur_source'] = array(
+            '#type' => 'item',
+            '#title' => t('Existing Main or Source File'),
+            '#markup' => $source_file
+        );
+        $form['sourcefile']['cur_source_checkbox'] = array(
+            '#type' => 'checkbox',
+            '#title' => t('Delete Existing Main or Source File'),
+            '#description' => 'Check to delete the existing Main or Source file.'
+        );
+        $form['sourcefile']['sourcefile1'] = array(
+            '#type' => 'file',
+            '#title' => t('Upload New Main or Source File'),
+            '#size' => 48,
+            '#description' => t("Upload new Main or Source file above if you want to replace the existing file. Leave blank if you want to keep using the existing file. <br />") . t('Allowed file extensions : ') . variable_get('textbook_companion_source_extensions', '')
+        );
+        $form['sourcefile']['cur_source_file_id'] = array(
+            '#type' => 'hidden',
+            '#value' => $source_file_id
+        );
+      }
+    else
+      {
+        $form['sourcefile']['sourcefile1'] = array(
+            '#type' => 'file',
+            '#title' => t('Upload New Main or Source File'),
+            '#size' => 48,
+            '#description' => t('Allowed file extensions : ') . variable_get('textbook_companion_source_extensions', '')
+        );
+      }
+    $form['submit'] = array(
+        '#type' => 'submit',
+        '#value' => t('Submit')
+    );
+    $form['cancel'] = array(
+        '#type' => 'item',
+        '#markup' => l(t('Cancel'), 'textbook-companion/code')
+    );
+    return $form;
+  }
+function upload_examples_edit_form_validate($form, &$form_state)
+  {
+    if (!check_name($form_state['values']['example_caption']))
+        form_set_error('example_caption', t('Example Caption can contain only alphabets, numbers and spaces.'));
+    if (isset($_FILES['files']))
+      {
+        /* check for valid filename extensions */
+        foreach ($_FILES['files']['name'] as $file_form_name => $file_name)
+          {
+            if ($file_name)
+              {
+                /* checking file type */
+                if (strstr($file_form_name, 'source'))
+                    $file_type = 'S';
+                else if (strstr($file_form_name, 'result'))
+                    $file_type = 'R';
+                else if (strstr($file_form_name, 'xcos'))
+                    $file_type = 'X';
+                else
+                    $file_type = 'U';
+                $allowed_extensions_str = '';
+                switch ($file_type)
+                {
+                    case 'S':
+                        $allowed_extensions_str = variable_get('textbook_companion_source_extensions', '');
+                        break;
+                    case 'R':
+                        $allowed_extensions_str = variable_get('textbook_companion_result_extensions', '');
+                        break;
+                    case 'X':
+                        $allowed_extensions_str = variable_get('textbook_companion_xcos_extensions', '');
+                        break;
+                }
+                $allowed_extensions = explode(',', $allowed_extensions_str);
+                $temp_ext = explode('.', strtolower($_FILES['files']['name'][$file_form_name]));
+                $temp_extension = end($temp_ext);
+                if (!in_array($temp_extension, $allowed_extensions))
+                    form_set_error($file_form_name, t('Only file with ' . $allowed_extensions_str . ' extensions can be uploaded.'));
+                if ($_FILES['files']['size'][$file_form_name] <= 0)
+                    form_set_error($file_form_name, t('File size cannot be zero.'));
+                /* check if valid file name */
+                if (!textbook_companion_check_valid_filename($_FILES['files']['name'][$file_form_name]))
+                    form_set_error($file_form_name, t('Invalid file name specified. Only alphabets, numbers and underscore is allowed as a valid filename.'));
+              }
+          }
+      }
+    /* add javascript again for automatic book title, check if example uploaded, dependency selection effects */
+    /*$chapter_name_js = " $(document).ready(function() {
+    $('#edit-number').change(function() {
+    $.get('" . base_path() . "textbook-companion/ajax/chapter-title/' + $('#edit-number').val() + '/' + " . $row->pre_id . ", function(data) {
+    $('#edit-name').val(data);
+    });
+    });
+    $('#edit-example-number').change(function() {
+    $.get('" . base_path() . "textbook-companion/ajax/example-exists/' + $('#edit-number').val() + '/' + $('#edit-example-number').val(), function(data) {
+    if (data) {
+    alert(data);
+    }
+    });
+    });
+    $('#edit-existing-depfile-dep-book-title').change(function() {
+    
+    var dep_selected = ''; 
+    /* showing and hiding relevant files */
+    /*$('.form-checkboxes .option').hide();
+    $('.form-checkboxes .option').each(function(index) {
+    var activeClass = $('#edit-existing-depfile-dep-book-title').val();
+    if ($(this).children().hasClass(activeClass)) {
+    $(this).show();
+    }
+    if ($(this).children().attr('checked') == true) {
+    dep_selected += $(this).children().next().text() + '<br />';
+    }
+    });
+    /* showing list of already existing dependencies */
+    /* $('#existing_depfile_selected').html(dep_selected);
+    
+    });
+    
+    $('.form-checkboxes .option').change(function() {
+    $('#edit-existing-depfile-dep-book-title').trigger('change');
+    });
+    $('#edit-existing-depfile-dep-book-title').trigger('change');
+    });";
+    drupal_add_js($chapter_name_js, 'inline', 'header');*/
+  }
+function upload_examples_edit_form_submit($form, &$form_state)
+  {
+    global $user;
+    $example_id = arg(3);
+    /* get example details */
+    /*$example_q = db_query("SELECT * FROM {textbook_companion_example} WHERE id = %d LIMIT 1", $example_id);
+    $example_data = db_fetch_object($example_q);*/
+    $query = db_select('textbook_companion_example');
+    $query->fields('textbook_companion_example');
+    $query->condition('id', $example_id);
+    $query->range(0, 1);
+    $example_q = $query->execute();
+    $example_data = $example_q->fetchObject();
+    if (!$example_q)
+      {
+        drupal_set_message(t("Invalid example selected."), 'error');
+        drupal_goto('');
+        return;
+      }
+    if ($example_data->approval_status != 0)
+      {
+        drupal_set_message(t("You cannot edit an example after it has been approved or dis-approved. Please contact site administrator if you want to edit this example."), 'error');
+        drupal_goto('');
+        return;
+      }
+    /* get chapter details */
+    /*$chapter_q = db_query("SELECT * FROM {textbook_companion_chapter} WHERE id = %d", $example_data->chapter_id);
+    $chapter_data = db_fetch_object($chapter_q);*/
+    $query = db_select('textbook_companion_chapter');
+    $query->fields('textbook_companion_chapter');
+    $query->condition('id', $example_data->chapter_id);
+    $result = $query->execute();
+    $chapter_data = $result->fetchObject();
+    if (!$chapter_data)
+      {
+        drupal_set_message(t("Invalid chapter selected."), 'error');
+        drupal_goto('');
+        return;
+      }
+    /* get preference details */
+    /*$preference_q = db_query("SELECT * FROM {textbook_companion_preference} WHERE id = %d", $chapter_data->preference_id);
+    $preference_data = db_fetch_object($preference_q);*/
+    $query = db_select('textbook_companion_preference');
+    $query->fields('textbook_companion_preference');
+    $query->condition('id', $chapter_data->preference_id);
+    $result = $query->execute();
+    $preference_data = $result->fetchObject();
+    if (!$preference_data)
+      {
+        drupal_set_message(t("Invalid book selected."), 'error');
+        drupal_goto('');
+        return;
+      }
+    if ($preference_data->approval_status != 1)
+      {
+        drupal_set_message(t("Cannot edit example. Either the book proposal has not been approved or it has been rejected."), 'error');
+        drupal_goto('');
+        return;
+      }
+    /* get proposal details */
+    /*$proposal_q = db_query("SELECT * FROM {textbook_companion_proposal} WHERE id = %d", $preference_data->proposal_id);
+    $proposal_data = db_fetch_object($proposal_q);*/
+    $query = db_select('textbook_companion_proposal');
+    $query->fields('textbook_companion_proposal');
+    $query->condition('id', $preference_data->proposal_id);
+    $result = $query->execute();
+    $proposal_data = $result->fetchObject();
+    if (!$proposal_data)
+      {
+        drupal_set_message(t("Invalid proposal selected."), 'error');
+        drupal_goto('');
+        return;
+      }
+    if ($proposal_data->uid != $user->uid)
+      {
+        drupal_set_message(t("You do not have permissions to edit this example."), 'error');
+        drupal_goto('');
+        return;
+      }
+    /* creating directories */
+    $root_path = textbook_companion_path();
+    $dest_path = $preference_data->directory_name . '/';
+    if (!is_dir($root_path . $dest_path))
+        mkdir($root_path . $dest_path);
+    $dest_path .= 'CH' . $chapter_data->number . '/';
+    if (!is_dir($root_path . $dest_path))
+        mkdir($root_path . $dest_path);
+    $dest_path .= 'EX' . $example_data->number . '/';
+    if (!is_dir($root_path . $dest_path))
+        mkdir($root_path . $dest_path);
+    $filepath = 'CH' . $chapter_data->number . '/' . 'EX' . $example_data->number . '/';
+    /* updating example caption */
+    /*db_query("UPDATE {textbook_companion_example} SET caption = '%s' WHERE id = %d", $form_state['values']['example_caption'], $example_id);*/
+    $query = db_update('textbook_companion_example');
+    $query->fields(array(
+        'caption' => $form_state['values']['example_caption']
+    ));
+    $query->condition('id', $example_id);
+    $num_updated = $query->execute();
+    /* handle source file */
+    if (isset($form_state['values']['cur_source_file_id']))
+      {
+        $cur_file_id = $form_state['values']['cur_source_file_id'];
+      }
+    else
+      {
+        $cur_file_id = isset($form_state['values']['cur_source_file_id']);
+      }
+    //var_dump($cur_file_id);die;
+    if ($cur_file_id > 0)
+      {
+        /*$file_q = db_query("SELECT * FROM  {textbook_companion_example_files} WHERE id = %d AND example_id = %d", $cur_file_id, $example_data->id);
+        $file_data = db_fetch_object($file_q);*/
+        //var_dump($cur_file_id. $example_data->id);die;
+        $query = db_select('textbook_companion_example_files');
+        $query->fields('textbook_companion_example_files');
+        $query->condition('id', $cur_file_id);
+        $query->condition('example_id', $example_data->id);
+        $result = $query->execute();
+        $file_data = $result->fetchObject();
+        if (!$file_data)
+          {
+            drupal_set_message("Error deleting example source file. File not present in database.", 'error');
+            return;
+          }
+        if (($form_state['values']['cur_source_checkbox'] == 1) && (!$_FILES['files']['name']['sourcefile1']))
+          {
+            if (!delete_file($cur_file_id))
+              {
+                drupal_set_message("Error deleting example source file.", 'error');
+                return;
+              }
+          }
+      }
+    if ($_FILES['files']['name']['sourcefile1'])
+      {
+        if ($cur_file_id > 0)
+          {
+            if (!delete_file($cur_file_id))
+              {
+                drupal_set_message("Error removing previous example source file.", 'error');
+                return;
+              }
+          }
+        if (file_exists($root_path . $dest_path . $_FILES['files']['name']['sourcefile1']))
+          {
+            drupal_set_message(t("Error uploading source file. File !filename already exists.", array(
+                '!filename' => $_FILES['files']['name']['sourcefile1']
+            )), 'error');
+            return;
+          }
+        /* uploading file */
+        if (move_uploaded_file($_FILES['files']['tmp_name']['sourcefile1'], $root_path . $dest_path . $_FILES['files']['name']['sourcefile1']))
+          {
+            /* for uploaded files making an entry in the database */
+            /*db_query("INSERT INTO {textbook_companion_example_files} (example_id, filename, filepath, filemime, filesize, filetype, timestamp)
+            VALUES (%d, '%s', '%s', '%s', %d, '%s', %d)",
+            $example_data->id,
+            $_FILES['files']['name']['sourcefile1'],
+            $dest_path . $_FILES['files']['name']['sourcefile1'],
+            $_FILES['files']['type']['sourcefile1'],
+            $_FILES['files']['size']['sourcefile1'],
+            'S',
+            time()
+            );*/
+            $query = "INSERT INTO {textbook_companion_example_files} (example_id, filename, filepath, filemime, filesize, filetype, 		timestamp) VALUES (:example_id, :filename, :filepath, :filemime, :filesize, :filetype,:timestamp)";
+            $args = array(
+                ":example_id" => $example_data->id,
+                ":filename" => $_FILES['files']['name']['sourcefile1'],
+                ":filepath" => $filepath . $_FILES['files']['name']['sourcefile1'],
+                ":filemime" => 'application/dwxml',
+                ":filesize" => $_FILES['files']['size']['sourcefile1'],
+                ":filetype" => 'S',
+                ":timestamp" => time()
+            );
+            $result = db_query($query, $args, array(
+                'return' => Database::RETURN_INSERT_ID
+            ));
+            drupal_set_message($_FILES['files']['name']['sourcefile1'] . ' uploaded successfully.', 'status');
+          }
+        else
+          {
+            drupal_set_message('Error uploading file : ' . $dest_path . '/' . $_FILES['files']['name']['sourcefile1'], 'error');
+          }
+      }
+    /* sending email */
+    $email_to = $user->mail;
+    $from = variable_get('textbook_companion_from_email', '');
+    $bcc = variable_get('textbook_companion_emails', '');
+    $cc = variable_get('textbook_companion_cc_emails', '');
+    $param['example_updated']['example_id'] = $example_id;
+    $param['example_updated']['user_id'] = $user->uid;
+    $param['example_updated']['headers'] = array(
+        'From' => $from,
+        'MIME-Version' => '1.0',
+        'Content-Type' => 'text/plain; charset=UTF-8; format=flowed; delsp=yes',
+        'Content-Transfer-Encoding' => '8Bit',
+        'X-Mailer' => 'Drupal',
+        'Cc' => $cc,
+        'Bcc' => $bcc
+    );
+    if (!drupal_mail('textbook_companion', 'example_updated', $email_to, language_default(), $param, $from, TRUE))
+        drupal_set_message('Error sending email message.', 'error');
+    drupal_set_message(t("Example successfully udpated."), 'status');
+  }
+/******************************************************************************/
+/**************************** EDIT CHAPTER TITLE ******************************/
+/******************************************************************************/
+function edit_chapter_title_form($form, $form_state)
+  {
+    global $user;
+    /************************ start approve book details ************************/
+    /*$proposal_q = db_query("SELECT * FROM {textbook_companion_proposal} WHERE uid = %d ORDER BY id DESC LIMIT 1", $user->uid);
+    $proposal_data = db_fetch_object($proposal_q);*/
+    $query = db_select('textbook_companion_proposal');
+    $query->fields('textbook_companion_proposal');
+    $query->condition('uid', $user->uid);
+    $query->orderBy('id', 'DESC');
+    $query->range(0, 1);
+    $result = $query->execute();
+    $proposal_data = $result->fetchObject();
+    if (!$proposal_data)
+      {
+        drupal_set_message("Please submit a " . l('proposal', 'textbook-companion/proposal') . ".", 'error');
+        drupal_goto('textbook-companion/code');
+      }
+    if ($proposal_data->proposal_status != 1 && $proposal_data->proposal_status != 4)
+      {
+        switch ($proposal_data->proposal_status)
+        {
+            case 0:
+                drupal_set_message(t('We have already received your proposal. We will get back to you soon.'), 'status');
+                drupal_goto('textbook-companion/code');
+                return;
+                break;
+            case 2:
+                drupal_set_message(t('Your proposal has been dis-approved. Please create another proposal ' . l('here', 'proposal') . '.'), 'error');
+                drupal_goto('textbook-companion/code');
+                return;
+                break;
+            case 3:
+                drupal_set_message(t('Congratulations! You have completed your last book proposal. You have to create another proposal ' . l('here', 'textbook-companion/proposal') . '.'), 'status');
+                drupal_goto('textbook-companion/code');
+                return;
+                break;
+            default:
+                drupal_set_message(t('Invalid proposal state. Please contact site administrator for further information.'), 'error');
+                drupal_goto('textbook-companion/code');
+                return;
+                break;
+        }
+      }
+    /*$preference_q = db_query("SELECT * FROM {textbook_companion_preference} WHERE proposal_id = %d AND approval_status = 1 LIMIT 1", $proposal_data->id);
+    $preference_data = db_fetch_object($preference_q);*/
+    $query = db_select('textbook_companion_preference');
+    $query->fields('textbook_companion_preference');
+    $query->condition('proposal_id', $proposal_data->id);
+    $query->condition('approval_status', 1);
+    $query->range(0, 1);
+    $result = $query->execute();
+    $preference_data = $result->fetchObject();
+    if (!$preference_data)
+      {
+        drupal_set_message(t('Invalid Book Preference status. Please contact site administrator for further information.'), 'error');
+        drupal_goto('textbook-companion/code');
+        return;
+      }
+    /************************ end approve book details **************************/
+    $chapter_id = arg(4);
+    /*$chapter_q = db_query("SELECT * FROM {textbook_companion_chapter} WHERE id = %d AND preference_id = %d", $chapter_id, $preference_data->id);
+    $chapter_data = db_fetch_object($chapter_q);*/
+    $query = db_select('textbook_companion_chapter');
+    $query->fields('textbook_companion_chapter');
+    $query->condition('id', $chapter_id);
+    $query->condition('preference_id', $preference_data->id);
+    $result = $query->execute();
+    $chapter_data = $result->fetchObject();
+    if (!$chapter_data)
+      {
+        drupal_set_message(t('Invalid chapter.'), 'error');
+        drupal_goto('textbook-companion/code');
+        return;
+      }
+    $form['#redirect'] = 'textbook-companion/code';
+    $form['book_details']['book'] = array(
+        '#type' => 'item',
+        '#markup' => $preference_data->book,
+        '#title' => t('Title of the Book')
+    );
+    $form['contributor_name'] = array(
+        '#type' => 'item',
+        '#markup' => $proposal_data->full_name,
+        '#title' => t('Contributor Name')
+    );
+    $form['number'] = array(
+        '#type' => 'item',
+        '#title' => t('Chapter No'),
+        '#markup' => $chapter_data->number
+    );
+    $form['chapter_title'] = array(
+        '#type' => 'textfield',
+        '#title' => t('Title of the Chapter'),
+        '#size' => 40,
+        '#maxlength' => 255,
+        '#required' => TRUE,
+        '#default_value' => $chapter_data->name
+    );
+    $form['submit'] = array(
+        '#type' => 'submit',
+        '#value' => t('Submit')
+    );
+    $form['cancel'] = array(
+        '#type' => 'markup',
+        '#value' => l(t('Cancel'), 'textbook_companion/code')
+    );
+    return $form;
+  }
+function edit_chapter_title_form_validate($form, &$form_state)
+  {
+    if (!check_name($form_state['values']['chapter_title']))
+        form_set_error('chapter_title', t('Title of the Chapter can contain only alphabets, numbers and spaces.'));
+  }
+function edit_chapter_title_form_submit($form, &$form_state)
+  {
+    global $user;
+    /************************ start approve book details ************************/
+    /*$proposal_q = db_query("SELECT * FROM {textbook_companion_proposal} WHERE uid = %d ORDER BY id DESC LIMIT 1", $user->uid);
+    $proposal_data = db_fetch_object($proposal_q);*/
+    $query = db_select('textbook_companion_proposal');
+    $query->fields('textbook_companion_proposal');
+    $query->condition('uid', $user->uid);
+    $query->orderBy('id', 'DESC');
+    $query->range(0, 1);
+    $result = $query->execute();
+    $proposal_data = $result->fetchObject();
+    if (!$proposal_data)
+      {
+        drupal_set_message("Please submit a " . l('proposal', 'textbook-companion/proposal') . ".", 'error');
+        drupal_goto('textbook-companion/code');
+      }
+    if ($proposal_data->proposal_status != 1 && $proposal_data->proposal_status != 4)
+      {
+        switch ($proposal_data->proposal_status)
+        {
+            case 0:
+                drupal_set_message(t('We have already received your proposal. We will get back to you soon.'), 'status');
+                drupal_goto('textbook-companion/code');
+                return;
+                break;
+            case 2:
+                drupal_set_message(t('Your proposal has been dis-approved. Please create another proposal ' . l('here', 'proposal') . '.'), 'error');
+                drupal_goto('textbook-companion/code');
+                return;
+                break;
+            case 3:
+                drupal_set_message(t('Congratulations! You have completed your last book proposal. You have to create another proposal ' . l('here', 'textbook-companion/proposal') . '.'), 'status');
+                drupal_goto('textbook-companion/code');
+                return;
+                break;
+            default:
+                drupal_set_message(t('Invalid proposal state. Please contact site administrator for further information.'), 'error');
+                drupal_goto('textbook-companion/code');
+                return;
+                break;
+        }
+      }
+    /*$preference_q = db_query("SELECT * FROM {textbook_companion_preference} WHERE proposal_id = %d AND approval_status = 1 LIMIT 1", $proposal_data->id);
+    $preference_data = db_fetch_object($preference_q);*/
+    $query = db_select('textbook_companion_preference');
+    $query->fields('textbook_companion_preference');
+    $query->condition('proposal_id', $proposal_data->id);
+    $query->condition('approval_status', 1);
+    $query->range(0, 1);
+    $result = $query->execute();
+    $preference_data = $result->fetchObject();
+    if (!$preference_data)
+      {
+        drupal_set_message(t('Invalid Book Preference status. Please contact site administrator for further information.'), 'error');
+        drupal_goto('textbook-companion/code');
+        return;
+      }
+    /************************ end approve book details **************************/
+    $chapter_id = arg(4);
+    /*$chapter_q = db_query("SELECT * FROM {textbook_companion_chapter} WHERE id = %d AND preference_id = %d", $chapter_id, $preference_data->id);
+    $chapter_data = db_fetch_object($chapter_q);*/
+    $query = db_select('textbook_companion_chapter');
+    $query->fields('textbook_companion_chapter');
+    $query->condition('id', $chapter_id);
+    $query->condition('preference_id', $preference_data->id);
+    $result = $query->execute();
+    $chapter_data = $result->fetchObject();
+    if (!$chapter_data)
+      {
+        drupal_set_message(t('Invalid chapter.'), 'error');
+        drupal_goto('textbookcompanion/code');
+        return;
+      }
+    /*db_query("UPDATE {textbook_companion_chapter} SET name = '%s' WHERE id = %d", $form_state['values']['chapter_title'], $chapter_id);*/
+    $query = db_update('textbook_companion_chapter');
+    $query->fields(array(
+        'name' => $form_state['values']['chapter_title']
+    ));
+    $query->condition('id', $chapter_id);
+    $num_updated = $query->execute();
+    drupal_set_message(t('Title of the Chapter updated.'), 'status');
+  }
+/******************************************************************************/
+/************************** GENERAL FUNCTIONS *********************************/
+/******************************************************************************/
+function _list_of_book_titles()
+  {
+    $book_titles = array(
+        '0' => 'Please select...'
+    );
+    /*$book_titles_q = db_query("SELECT * FROM {textbook_companion_preference} WHERE approval_status = 1 OR approval_status = 3 ORDER BY book ASC");*/
+    $query = db_select('textbook_companion_preference');
+    $query->fields('textbook_companion_preference');
+    $or = db_or();
+    $or->condition('approval_status', 1);
+    $or->condition('approval_status', 3);
+    $query->condition($or);
+    $query->orderBy('book', 'ASC');
+    $book_titles_q = $query->execute();
+    while ($book_titles_data = $book_titles_q->fetchObject())
+      {
+        $book_titles[$book_titles_data->id] = $book_titles_data->book . ' (Written by ' . $book_titles_data->author . ')';
+      }
+    return $book_titles;
+  }