Replace categories with keywords

Remove package base categories. Instead, users can now specify up to
twenty custom keywords that are taken into consideration when searching.

Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

11 files changed, 112 insertions, 183 deletions

diff --git a/schema/aur-schema.sql b/schema/aur-schema.sql
index 1935cf0c..9ac5d44d 100644
--- a/schema/aur-schema.sql
+++ b/schema/aur-schema.sql
@@ -64,43 +64,11 @@ CREATE TABLE Sessions (
 ) ENGINE = InnoDB;
 
 
--- Categories for grouping packages when they reside in
--- Unsupported or the AUR - based on the categories defined
--- in 'extra'.
---
-CREATE TABLE PackageCategories (
-	ID TINYINT UNSIGNED NOT NULL AUTO_INCREMENT,
-	Category VARCHAR(32) NOT NULL,
-	PRIMARY KEY (ID)
-) ENGINE = InnoDB;
-INSERT INTO PackageCategories (Category) VALUES ('none');
-INSERT INTO PackageCategories (Category) VALUES ('daemons');
-INSERT INTO PackageCategories (Category) VALUES ('devel');
-INSERT INTO PackageCategories (Category) VALUES ('editors');
-INSERT INTO PackageCategories (Category) VALUES ('emulators');
-INSERT INTO PackageCategories (Category) VALUES ('games');
-INSERT INTO PackageCategories (Category) VALUES ('gnome');
-INSERT INTO PackageCategories (Category) VALUES ('i18n');
-INSERT INTO PackageCategories (Category) VALUES ('kde');
-INSERT INTO PackageCategories (Category) VALUES ('lib');
-INSERT INTO PackageCategories (Category) VALUES ('modules');
-INSERT INTO PackageCategories (Category) VALUES ('multimedia');
-INSERT INTO PackageCategories (Category) VALUES ('network');
-INSERT INTO PackageCategories (Category) VALUES ('office');
-INSERT INTO PackageCategories (Category) VALUES ('science');
-INSERT INTO PackageCategories (Category) VALUES ('system');
-INSERT INTO PackageCategories (Category) VALUES ('x11');
-INSERT INTO PackageCategories (Category) VALUES ('xfce');
-INSERT INTO PackageCategories (Category) VALUES ('fonts');
-INSERT INTO PackageCategories (Category) VALUES ('wayland');
-
-
 -- Information on package bases
 --
 CREATE TABLE PackageBases (
 	ID INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
 	Name VARCHAR(255) NOT NULL,
-	CategoryID TINYINT UNSIGNED NOT NULL DEFAULT 1,
 	NumVotes INTEGER UNSIGNED NOT NULL DEFAULT 0,
 	Popularity DECIMAL(6,2) UNSIGNED NOT NULL DEFAULT 0,
 	OutOfDateTS BIGINT UNSIGNED NULL DEFAULT NULL,
@@ -111,12 +79,10 @@ CREATE TABLE PackageBases (
 	PackagerUID INTEGER UNSIGNED NULL DEFAULT NULL,      -- Last packager
 	PRIMARY KEY (ID),
 	UNIQUE (Name),
-	INDEX (CategoryID),
 	INDEX (NumVotes),
 	INDEX (SubmitterUID),
 	INDEX (MaintainerUID),
 	INDEX (PackagerUID),
-	FOREIGN KEY (CategoryID) REFERENCES PackageCategories(ID) ON DELETE NO ACTION,
 	-- deleting a user will cause packages to be orphaned, not deleted
 	FOREIGN KEY (SubmitterUID) REFERENCES Users(ID) ON DELETE SET NULL,
 	FOREIGN KEY (MaintainerUID) REFERENCES Users(ID) ON DELETE SET NULL,
@@ -124,6 +90,16 @@ CREATE TABLE PackageBases (
 ) ENGINE = InnoDB;
 
 
+-- Keywords of package bases
+--
+CREATE TABLE PackageKeywords (
+	PackageBaseID INTEGER UNSIGNED NOT NULL,
+	Keyword VARCHAR(255) NOT NULL DEFAULT '',
+	PRIMARY KEY (PackageBaseID, Keyword),
+	FOREIGN KEY (PackageBaseID) REFERENCES PackageBases(ID) ON DELETE CASCADE
+) ENGINE = InnoDB;
+
+
 -- Information about the actual packages
 --
 CREATE TABLE Packages (
diff --git a/upgrading/4.0.0.txt b/upgrading/4.0.0.txt
index aa1e535d..fd04c44d 100644
--- a/upgrading/4.0.0.txt
+++ b/upgrading/4.0.0.txt
@@ -38,4 +38,24 @@ ALTER TABLE PackageBases
 	ADD COLUMN Popularity DECIMAL(6,2) UNSIGNED NOT NULL DEFAULT 0;
 ----
 
-6. (optional) Setup cgit to browse the Git repositories via HTTP.
+6. Drop the category ID foreign key from the PackageBases table:
+
+`ALTER TABLE PackageBases DROP FOREIGN KEY PackageBases_ibfk_1;` should
+work in most cases. Otherwise, check the output of `SHOW CREATE TABLE
+PackageBases;` and use the foreign key name shown there.
+
+7. Replace the package base categories with keywords:
+
+----
+ALTER TABLE PackageBases DROP COLUMN CategoryID;
+DROP TABLE PackageCategories;
+
+CREATE TABLE PackageKeywords (
+	PackageBaseID INTEGER UNSIGNED NOT NULL,
+	Keyword VARCHAR(255) NOT NULL DEFAULT '',
+	PRIMARY KEY (PackageBaseID, Keyword),
+	FOREIGN KEY (PackageBaseID) REFERENCES PackageBases(ID) ON DELETE CASCADE
+) ENGINE = InnoDB;
+----
+
+8. (optional) Setup cgit to browse the Git repositories via HTTP.
diff --git a/web/html/pkgbase.php b/web/html/pkgbase.php
index c834f8b5..5179d0c1 100644
--- a/web/html/pkgbase.php
+++ b/web/html/pkgbase.php
@@ -96,8 +96,8 @@ if (check_token()) {
 		list($ret, $output) = pkgbase_notify($ids, false);
 	} elseif (current_action("do_DeleteComment")) {
 		list($ret, $output) = pkgbase_delete_comment();
-	} elseif (current_action("do_ChangeCategory")) {
-		list($ret, $output) = pkgbase_change_category($base_id);
+	} elseif (current_action("do_SetKeywords")) {
+		list($ret, $output) = pkgbase_set_keywords($base_id, preg_split("/[\s,;]+/", $_POST['keywords'], -1, PREG_SPLIT_NO_EMPTY));
 	} elseif (current_action("do_FileRequest")) {
 		list($ret, $output) = pkgreq_file($ids, $_POST['type'], $_POST['merge_into'], $_POST['comments']);
 	} elseif (current_action("do_CloseRequest")) {
diff --git a/web/lib/aurjson.class.php b/web/lib/aurjson.class.php
index f25954c7..c896b042 100644
--- a/web/lib/aurjson.class.php
+++ b/web/lib/aurjson.class.php
@@ -19,7 +19,7 @@ class AurJSON {
 	private static $fields_v1 = array(
 		'Packages.ID', 'Packages.Name',
 		'PackageBases.ID AS PackageBaseID',
-		'PackageBases.Name AS PackageBase', 'Version', 'CategoryID',
+		'PackageBases.Name AS PackageBase', 'Version',
 		'Description', 'URL', 'NumVotes', 'OutOfDateTS AS OutOfDate',
 		'Users.UserName AS Maintainer',
 		'SubmittedTS AS FirstSubmitted', 'ModifiedTS AS LastModified',
@@ -28,13 +28,13 @@ class AurJSON {
 	private static $fields_v2 = array(
 		'Packages.ID', 'Packages.Name',
 		'PackageBases.ID AS PackageBaseID',
-		'PackageBases.Name AS PackageBase', 'Version', 'CategoryID',
+		'PackageBases.Name AS PackageBase', 'Version',
 		'Description', 'URL', 'NumVotes', 'OutOfDateTS AS OutOfDate',
 		'Users.UserName AS Maintainer',
 		'SubmittedTS AS FirstSubmitted', 'ModifiedTS AS LastModified'
 	);
 	private static $numeric_fields = array(
-		'ID', 'PackageBaseID', 'CategoryID', 'NumVotes', 'OutOfDate',
+		'ID', 'PackageBaseID', 'NumVotes', 'OutOfDate',
 		'FirstSubmitted', 'LastModified'
 	);
 
@@ -62,7 +62,7 @@ class AurJSON {
 		if (isset($http_data['v'])) {
 			$this->version = intval($http_data['v']);
 		}
-		if ($this->version < 1 || $this->version > 3) {
+		if ($this->version < 1 || $this->version > 4) {
 			return $this->json_error('Invalid version specified.');
 		}
 
@@ -229,6 +229,9 @@ class AurJSON {
 			while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
 				$resultcount++;
 				$row['URLPath'] = sprintf(config_get('options', 'snapshot_uri'), urlencode($row['PackageBase']));
+				if ($this->version < 4) {
+					$row['CategoryID'] = 1;
+				}
 
 				/*
 				 * Unfortunately, mysql_fetch_assoc() returns
diff --git a/web/lib/credentials.inc.php b/web/lib/credentials.inc.php
index b813b901..614f2d99 100644
--- a/web/lib/credentials.inc.php
+++ b/web/lib/credentials.inc.php
@@ -8,7 +8,7 @@ define("CRED_ACCOUNT_SEARCH", 5);
 define("CRED_COMMENT_DELETE", 6);
 define("CRED_COMMENT_VIEW_DELETED", 22);
 define("CRED_PKGBASE_ADOPT", 7);
-define("CRED_PKGBASE_CHANGE_CATEGORY", 8);
+define("CRED_PKGBASE_SET_KEYWORDS", 8);
 define("CRED_PKGBASE_DELETE", 9);
 define("CRED_PKGBASE_DISOWN", 10);
 define("CRED_PKGBASE_EDIT_COMAINTAINERS", 24);
@@ -60,7 +60,7 @@ function has_credential($credential, $approved_users=array()) {
 	case CRED_COMMENT_DELETE:
 	case CRED_COMMENT_VIEW_DELETED:
 	case CRED_PKGBASE_ADOPT:
-	case CRED_PKGBASE_CHANGE_CATEGORY:
+	case CRED_PKGBASE_SET_KEYWORDS:
 	case CRED_PKGBASE_DELETE:
 	case CRED_PKGBASE_EDIT_COMAINTAINERS:
 	case CRED_PKGBASE_DISOWN:
diff --git a/web/lib/pkgbasefuncs.inc.php b/web/lib/pkgbasefuncs.inc.php
index 327b7f9e..c8c99ebb 100644
--- a/web/lib/pkgbasefuncs.inc.php
+++ b/web/lib/pkgbasefuncs.inc.php
@@ -3,25 +3,6 @@
 include_once("pkgreqfuncs.inc.php");
 
 /**
- * Get all package categories stored in the database
- *
- * @param \PDO An already established database connection
- *
- * @return array All package categories
- */
-function pkgbase_categories() {
-	$dbh = DB::connect();
-	$q = "SELECT * FROM PackageCategories WHERE ID != 1 ";
-	$q.= "ORDER BY Category ASC";
-	$result = $dbh->query($q);
-	if (!$result) {
-		return null;
-	}
-
-	return $result->fetchAll(PDO::FETCH_KEY_PAIR);
-}
-
-/**
  * Get the number of non-deleted comments for a specific package base
  *
  * @param string $base_id The package base ID to get comment count for
@@ -186,17 +167,15 @@ function pkgbase_get_details($base_id) {
 	$dbh = DB::connect();
 
 	$q = "SELECT PackageBases.ID, PackageBases.Name, ";
-	$q.= "PackageBases.CategoryID, PackageBases.NumVotes, ";
+	$q.= "PackageBases.NumVotes, ";
 	$q.= "PackageBases.OutOfDateTS, PackageBases.SubmittedTS, ";
 	$q.= "PackageBases.ModifiedTS, PackageBases.SubmitterUID, ";
 	$q.= "PackageBases.MaintainerUID, PackageBases.PackagerUID, ";
-	$q.= "PackageCategories.Category, ";
 	$q.= "(SELECT COUNT(*) FROM PackageRequests ";
 	$q.= " WHERE PackageRequests.PackageBaseID = PackageBases.ID ";
 	$q.= " AND PackageRequests.Status = 0) AS RequestCount ";
-	$q.= "FROM PackageBases, PackageCategories ";
-	$q.= "WHERE PackageBases.CategoryID = PackageCategories.ID ";
-	$q.= "AND PackageBases.ID = " . intval($base_id);
+	$q.= "FROM PackageBases ";
+	$q.= "WHERE PackageBases.ID = " . intval($base_id);
 	$result = $dbh->query($q);
 
 	$row = array();
@@ -933,63 +912,62 @@ function pkgbase_delete_comment() {
 }
 
 /**
- * Change package base category
+ * Get a list of package base keywords
  *
- * @param int Package base ID of the package base to modify
+ * @param int $base_id The package base ID to retrieve the keywords for
  *
- * @return array Tuple of success/failure indicator and error message
+ * @return array An array of keywords
  */
-function pkgbase_change_category($base_id) {
-	$uid = uid_from_sid($_COOKIE["AURSID"]);
-	if (!$uid) {
-		return array(false, __("You must be logged in before you can edit package information."));
-	}
-
-	if (isset($_POST["category_id"])) {
-		$category_id = $_POST["category_id"];
-	} else {
-		return array(false, __("Missing category ID."));
-	}
-
+function pkgbase_get_keywords($base_id) {
 	$dbh = DB::connect();
-	$catArray = pkgbase_categories($dbh);
-	if (!array_key_exists($category_id, $catArray)) {
-		return array(false, __("Invalid category ID."));
-	}
-
-	$base_id = intval($base_id);
-
-	/* Verify package ownership. */
-	$q = "SELECT MaintainerUID FROM PackageBases WHERE ID = " . $base_id;
+	$q = "SELECT Keyword FROM PackageKeywords ";
+	$q .= "WHERE PackageBaseID = " . intval($base_id) . " ";
+	$q .= "ORDER BY Keyword ASC";
 	$result = $dbh->query($q);
-	if ($result) {
-		$row = $result->fetch(PDO::FETCH_ASSOC);
-	}
 
-	if (!$result || !has_credential(CRED_PKGBASE_CHANGE_CATEGORY, array($row["MaintainerUID"]))) {
-		return array(false, __("You are not allowed to change this package category."));
+	if ($result) {
+		return $result->fetchAll(PDO::FETCH_COLUMN, 0);
+	} else {
+		return array();
 	}
-
-	$q = "UPDATE PackageBases ";
-	$q.= "SET CategoryID = ".intval($category_id)." ";
-	$q.= "WHERE ID = ".intval($base_id);
-	$dbh->exec($q);
-	return array(true, __("Package category changed."));
 }
 
 /**
- * Change the category a package base belongs to
+ * Update the list of keywords of a package base
  *
- * @param int $base_id The package base ID to change the category for
- * @param int $category_id The new category ID for the package
+ * @param int $base_id The package base ID to update the keywords of
+ * @param array $users Array of keywords
  *
- * @return void
+ * @return array Tuple of success/failure indicator and error message
  */
-function pkgbase_update_category($base_id, $category_id) {
+function pkgbase_set_keywords($base_id, $keywords) {
+	$base_id = intval($base_id);
+
+	if (!has_credential(CRED_PKGBASE_SET_KEYWORDS, array(pkgbase_maintainer_uid($base_id)))) {
+		return array(false, __("You are not allowed to edit the keywords of this package base."));
+	}
+
+	/* Remove empty and duplicate user names. */
+	$keywords = array_unique(array_filter(array_map('trim', $keywords)));
+
 	$dbh = DB::connect();
-	$q = sprintf("UPDATE PackageBases SET CategoryID = %d WHERE ID = %d",
-		$category_id, $base_id);
+
+	$q = sprintf("DELETE FROM PackageKeywords WHERE PackageBaseID = %d", $base_id);
 	$dbh->exec($q);
+
+	$i = 0;
+	foreach ($keywords as $keyword) {
+		$q = sprintf("INSERT INTO PackageKeywords (PackageBaseID, Keyword) VALUES (%d, %s)", $base_id, $dbh->quote($keyword));
+		var_dump($q);
+		$dbh->exec($q);
+
+		$i++;
+		if ($i >= 20) {
+			break;
+		}
+	}
+
+	return array(true, __("The package base keywords have been updated."));
 }
 
 /**
diff --git a/web/lib/pkgfuncs.inc.php b/web/lib/pkgfuncs.inc.php
index f5275788..35b0e4e4 100644
--- a/web/lib/pkgfuncs.inc.php
+++ b/web/lib/pkgfuncs.inc.php
@@ -400,17 +400,16 @@ function pkg_get_details($id=0) {
 	$dbh = DB::connect();
 
 	$q = "SELECT Packages.*, PackageBases.ID AS BaseID, ";
-	$q.= "PackageBases.Name AS BaseName, PackageBases.CategoryID, ";
+	$q.= "PackageBases.Name AS BaseName, ";
 	$q.= "PackageBases.NumVotes, PackageBases.OutOfDateTS, ";
 	$q.= "PackageBases.SubmittedTS, PackageBases.ModifiedTS, ";
 	$q.= "PackageBases.SubmitterUID, PackageBases.MaintainerUID, ";
-	$q.= "PackageBases.PackagerUID, PackageCategories.Category, ";
+	$q.= "PackageBases.PackagerUID, ";
 	$q.= "(SELECT COUNT(*) FROM PackageRequests ";
 	$q.= " WHERE PackageRequests.PackageBaseID = Packages.PackageBaseID ";
 	$q.= " AND PackageRequests.Status = 0) AS RequestCount ";
-	$q.= "FROM Packages, PackageBases, PackageCategories ";
+	$q.= "FROM Packages, PackageBases ";
 	$q.= "WHERE PackageBases.ID = Packages.PackageBaseID ";
-	$q.= "AND PackageBases.CategoryID = PackageCategories.ID ";
 	$q.= "AND Packages.ID = " . intval($id);
 	$result = $dbh->query($q);
 
@@ -475,14 +474,12 @@ function pkg_display_details($id=0, $row, $SID="") {
  *  request vars:
  *    O  - starting result number
  *    PP - number of search hits per page
- *    C  - package category ID number
  *    K  - package search string
  *    SO - search hit sort order:
  *          values: a - ascending
  *                  d - descending
  *    SB - sort search hits by:
- *          values: c - package category
- *                  n - package name
+ *          values: n - package name
  *                  v - number of votes
  *                  m - maintainer username
  *    SeB- property that search string (K) represents
@@ -516,7 +513,6 @@ function pkg_search_page($SID="") {
 	 */
 	if ($SID)
 		$myuid = uid_from_sid($SID);
-	$cats = pkgbase_categories($dbh);
 
 	/* Sanitize paging variables. */
 	if (isset($_GET['O'])) {
@@ -543,16 +539,13 @@ function pkg_search_page($SID="") {
 			   PackageVotes.UsersID AS Voted, ";
 	}
 	$q_select .= "Users.Username AS Maintainer,
-	PackageCategories.Category,
 	Packages.Name, Packages.Version, Packages.Description,
 	PackageBases.NumVotes, PackageBases.Popularity, Packages.ID,
 	Packages.PackageBaseID, PackageBases.OutOfDateTS ";
 
 	$q_from = "FROM Packages
 	LEFT JOIN PackageBases ON (PackageBases.ID = Packages.PackageBaseID)
-	LEFT JOIN Users ON (PackageBases.MaintainerUID = Users.ID)
-	LEFT JOIN PackageCategories
-	ON (PackageBases.CategoryID = PackageCategories.ID) ";
+	LEFT JOIN Users ON (PackageBases.MaintainerUID = Users.ID) ";
 	if ($SID) {
 		/* This is not needed for the total row count query. */
 		$q_from_extra = "LEFT JOIN PackageVotes
@@ -564,13 +557,6 @@ function pkg_search_page($SID="") {
 	}
 
 	$q_where = 'WHERE PackageBases.PackagerUID IS NOT NULL ';
-	/*
-	 * TODO: Possibly do string matching on category to make request
-	 * variable values more sensible.
-	 */
-	if (isset($_GET["C"]) && intval($_GET["C"])) {
-		$q_where .= "AND PackageBases.CategoryID = ".intval($_GET["C"])." ";
-	}
 
 	if (isset($_GET['K'])) {
 		if (isset($_GET["SeB"]) && $_GET["SeB"] == "m") {
@@ -600,7 +586,7 @@ function pkg_search_page($SID="") {
 			$q_where .= "AND (PackageBases.Name = " . $dbh->quote($_GET['K']) . ") ";
 		}
 		else {
-			/* Search by name and description (default). */
+			/* Keyword search (default). */
 			$count = 0;
 			$q_keywords = "";
 			$op = "";
@@ -624,7 +610,10 @@ function pkg_search_page($SID="") {
 
 				$term = "%" . addcslashes($term, '%_') . "%";
 				$q_keywords .= $op . " (Packages.Name LIKE " . $dbh->quote($term) . " OR ";
-				$q_keywords .= "Description LIKE " . $dbh->quote($term) . ") ";
+				$q_keywords .= "Description LIKE " . $dbh->quote($term) . " OR ";
+				$q_keywords .= "EXISTS (SELECT * FROM PackageKeywords WHERE ";
+				$q_keywords .= "PackageKeywords.PackageBaseID = Packages.PackageBaseID AND ";
+				$q_keywords .= "PackageKeywords.Keyword LIKE " . $dbh->quote($term) . ")) ";
 
 				$count++;
 				if ($count >= 20) {
@@ -657,9 +646,6 @@ function pkg_search_page($SID="") {
 	$q_sort = "ORDER BY ";
 	$sort_by = isset($_GET["SB"]) ? $_GET["SB"] : '';
 	switch ($sort_by) {
-	case 'c':
-		$q_sort .= "CategoryID " . $order . ", ";
-		break;
 	case 'v':
 		$q_sort .= "NumVotes " . $order . ", ";
 		break;
diff --git a/web/template/pkg_details.php b/web/template/pkg_details.php
index e50f0293..cc2f055c 100644
--- a/web/template/pkg_details.php
+++ b/web/template/pkg_details.php
@@ -11,7 +11,7 @@ $uid = uid_from_sid($SID);
 $pkgid = intval($row['ID']);
 $base_id = intval($row['BaseID']);
 
-$catarr = pkgbase_categories();
+$keywords = pkgbase_get_keywords($base_id);
 
 $submitter = username_from_id($row["SubmitterUID"]);
 $maintainer = username_from_id($row["MaintainerUID"]);
@@ -188,34 +188,25 @@ $sources = pkg_sources($row["ID"]);
 			<th><?= __('Upstream URL') . ': ' ?></th>
 			<td><a href="<?= htmlspecialchars($row['URL'], ENT_QUOTES) ?>" title="<?= __('Visit the website for') . ' ' . htmlspecialchars( $row['Name'])?>"><?= htmlspecialchars($row['URL'], ENT_QUOTES) ?></a></td>
 		</tr>
-		<tr>
-			<th><?= __('Category') . ': ' ?></th>
 <?php
-if (has_credential(CRED_PKGBASE_CHANGE_CATEGORY, array($row["MaintainerUID"]))):
+if (has_credential(CRED_PKGBASE_SET_KEYWORDS, array($row["MaintainerUID"]))):
 ?>
+		<tr>
+			<th><?= __('Keywords') . ': ' ?></th>
 			<td>
 				<form method="post" action="<?= htmlspecialchars(get_pkgbase_uri($row['BaseName']), ENT_QUOTES); ?>">
 					<div>
-						<input type="hidden" name="action" value="do_ChangeCategory" />
+						<input type="hidden" name="action" value="do_SetKeywords" />
 						<?php if ($SID): ?>
 						<input type="hidden" name="token" value="<?= htmlspecialchars($_COOKIE['AURSID']) ?>" />
 						<?php endif; ?>
-						<select name="category_id">
-<?php
-	foreach ($catarr as $cid => $catname):
-?>
-							<option value="<?= $cid ?>"<?php if ($cid == $row["CategoryID"]) { ?> selected="selected" <?php } ?>><?= $catname ?></option>
-	<?php endforeach; ?>
-						</select>
-						<input type="submit" value="<?= __('Change category') ?>"/>
+						<input type="text" name="keywords" value="<?= htmlspecialchars(implode(" ", $keywords), ENT_QUOTES) ?>"/>
+						<input type="submit" value="<?= __('Update') ?>"/>
 					</div>
 				</form>
-<?php else: ?>
-			<td>
-				<a href="<?= get_uri('/packages/'); ?>?C=<?= $row['CategoryID'] ?>"><?= $row['Category'] ?></a>
-<?php endif; ?>
 			</td>
 		</tr>
+<?php endif; ?>
 		<?php if (count($lics) > 0): ?>
 		<tr>
 			<th><?= __('Licenses') . ': ' ?></th>
diff --git a/web/template/pkg_search_form.php b/web/template/pkg_search_form.php
index 683675b1..2d03cfa5 100644
--- a/web/template/pkg_search_form.php
+++ b/web/template/pkg_search_form.php
@@ -19,7 +19,6 @@ $outdated_flags = array(
 
 $sortby = array(
 	'n' => __('Name'),
-	'c' => __('Category'),
 	'v' => __('Votes'),
 	'p' => __('Popularity'),
 	'w' => __('Voted'),
@@ -45,19 +44,6 @@ $per_page = array(50, 100, 250);
 	<fieldset>
 		<legend><?= __('Enter search criteria') ?></legend>
 		<div>
-			<label for="id_category"><?= __("Category"); ?></label>
-			<select name='C' id="id_category">
-				<option value='0'><?= __("Any"); ?></option>
-				<?php foreach (pkgbase_categories() as $id => $cat): ?>
-				<?php if (isset($_REQUEST['C']) && $_REQUEST['C'] == $id): ?>
-				<option value="<?= $id ?>" selected="selected"><?= $cat; ?></option>
-				<?php else: ?>
-				<option value="<?= $id ?>"><?= $cat; ?></option>
-				<?php endif; ?>
-				<?php endforeach; ?>
-			</select>
-		</div>
-		<div>
 			<label for="id_method"><?= __("Search by"); ?></label>
 			<select name='SeB'>
 				<?php foreach ($searchby as $k => $v): ?>
diff --git a/web/template/pkg_search_results.php b/web/template/pkg_search_results.php
index 5289b78e..13d9bfca 100644
--- a/web/template/pkg_search_results.php
+++ b/web/template/pkg_search_results.php
@@ -32,7 +32,6 @@ if (!$result): ?>
 					<?php if ($SID): ?>
 					<th>&nbsp;</th>
 					<?php endif; ?>
-					<th><a href="?<?= mkurl('SB=c&SO=' . $SO_next) ?>"><?= __("Category") ?></a></th>
 					<th><a href="?<?= mkurl('SB=n&SO=' . $SO_next) ?>"><?= __("Name") ?></a></th>
 					<th><?= __("Version") ?></th>
 					<th><a href="?<?= mkurl('SB=v&SO=' . $SO_next) ?>"><?= __("Votes") ?></a></th>
@@ -52,7 +51,6 @@ if (!$result): ?>
 		<?php if ($SID): ?>
 		<td><input type="checkbox" name="IDs[<?= $row["PackageBaseID"] ?>]" value="1" /></td>
 		<?php endif; ?>
-		<td><?= htmlspecialchars($row["Category"]) ?></td>
 		<td><a href="<?= htmlspecialchars(get_pkg_uri($row["Name"]), ENT_QUOTES); ?>"><?= htmlspecialchars($row["Name"]) ?></a></td>
 		<td<?php if ($row["OutOfDateTS"]): ?> class="flagged"<?php endif; ?>><?= htmlspecialchars($row["Version"]) ?></td>
 		<td><?= $row["NumVotes"] ?></td>
diff --git a/web/template/pkgbase_details.php b/web/template/pkgbase_details.php
index 2ef8788a..2522f34d 100644
--- a/web/template/pkgbase_details.php
+++ b/web/template/pkgbase_details.php
@@ -10,7 +10,7 @@ $uid = uid_from_sid($SID);
 
 $base_id = intval($row['ID']);
 
-$catarr = pkgbase_categories();
+$keywords = pkgbase_get_keywords($base_id);
 
 $submitter = username_from_id($row["SubmitterUID"]);
 $maintainer = username_from_id($row["MaintainerUID"]);
@@ -127,34 +127,25 @@ $pkgs = pkgbase_get_pkgnames($base_id);
 				<?php endif; ?>
 			</td>
 		</tr>
-		<tr>
-			<th><?= __('Category') . ': ' ?></th>
 <?php
-if (has_credential(CRED_PKGBASE_CHANGE_CATEGORY, array($row["MaintainerUID"]))):
+if (has_credential(CRED_PKGBASE_SET_KEYWORDS, array($row["MaintainerUID"]))):
 ?>
+		<tr>
+			<th><?= __('Keywords') . ': ' ?></th>
 			<td>
 				<form method="post" action="<?= htmlspecialchars(get_pkgbase_uri($row['Name']), ENT_QUOTES); ?>">
 					<div>
-						<input type="hidden" name="action" value="do_ChangeCategory" />
+						<input type="hidden" name="action" value="do_SetKeywords" />
 						<?php if ($SID): ?>
 						<input type="hidden" name="token" value="<?= htmlspecialchars($_COOKIE['AURSID']) ?>" />
 						<?php endif; ?>
-						<select name="category_id">
-<?php
-	foreach ($catarr as $cid => $catname):
-?>
-							<option value="<?= $cid ?>"<?php if ($cid == $row["CategoryID"]) { ?> selected="selected" <?php } ?>><?= $catname ?></option>
-	<?php endforeach; ?>
-						</select>
-						<input type="submit" value="<?= __('Change category') ?>"/>
+						<input type="text" name="keywords" value="<?= htmlspecialchars(implode(" ", $keywords), ENT_QUOTES) ?>"/>
+						<input type="submit" value="<?= __('Update') ?>"/>
 					</div>
 				</form>
-<?php else: ?>
-			<td>
-				<a href="<?= get_uri('/packages/'); ?>?C=<?= $row['CategoryID'] ?>"><?= $row['Category'] ?></a>
-<?php endif; ?>
 			</td>
 		</tr>
+<?php endif; ?>
 		<tr>
 			<th><?= __('Submitter') .': ' ?></th>
 			<?php if ($row["SubmitterUID"] && $SID): ?>