diff --git a/src/custom.cpp b/src/custom.cpp
index d0f766620..3df210391 100644
--- a/src/custom.cpp
+++ b/src/custom.cpp
@@ -224,9 +224,14 @@ int runCustomReport (
         table.setColumnWidth (columnCount, Table::minimum);
         table.setColumnJustification (columnCount, Table::left);
 
+        std::string value;
         int row = 0;
         foreach (task, tasks)
-          table.addCell (row++, columnCount, task->get ("project"));
+        {
+          value = task->get ("project");
+          context.hooks.trigger ("format-project", "project", value);
+          table.addCell (row++, columnCount, value);
+        }
       }
 
       else if (*col == "priority")
@@ -417,6 +422,7 @@ int runCustomReport (
           {
             Date dt (::atoi (created.c_str ()));
             age = formatSeconds ((time_t) (now - dt));
+            context.hooks.trigger ("format-age", "age", age);
             table.addCell (row, columnCount, age);
           }
         }
@@ -438,6 +444,7 @@ int runCustomReport (
           {
             Date dt (::atoi (created.c_str ()));
             age = formatSecondsCompact ((time_t) (now - dt));
+            context.hooks.trigger ("format-age_compact", "age_compact", age);
             table.addCell (row, columnCount, age);
           }
         }
@@ -467,6 +474,7 @@ int runCustomReport (
         {
           task->getTags (all);
           join (tags, " ", all);
+          context.hooks.trigger ("format-tags", "tags", tags);
           table.addCell (row++, columnCount, tags);
         }
       }
@@ -477,9 +485,14 @@ int runCustomReport (
         table.setColumnWidth (columnCount, Table::flexible);
         table.setColumnJustification (columnCount, Table::left);
 
+        std::string desc;
         int row = 0;
         foreach (task, tasks)
-          table.addCell (row++, columnCount, task->get ("description"));
+        {
+          desc = task->get ("description");
+          context.hooks.trigger ("format-description_only", "description_only", desc);
+          table.addCell (row++, columnCount, desc);
+        }
       }
 
       else if (*col == "description")
@@ -488,9 +501,14 @@ int runCustomReport (
         table.setColumnWidth (columnCount, Table::flexible);
         table.setColumnJustification (columnCount, Table::left);
 
+        std::string desc;
         int row = 0;
         foreach (task, tasks)
-          table.addCell (row++, columnCount, getFullDescription (*task, report));
+        {
+          desc = getFullDescription (*task, report);
+          context.hooks.trigger ("format-description", "description", desc);
+          table.addCell (row++, columnCount, desc);
+        }
       }
 
       else if (*col == "recur")
diff --git a/src/tests/hook.format-age.t b/src/tests/hook.format-age.t
new file mode 100755
index 000000000..b1e0df4e0
--- /dev/null
+++ b/src/tests/hook.format-age.t
@@ -0,0 +1,82 @@
+#! /usr/bin/perl
+################################################################################
+## task - a command line task list manager.
+##
+## Copyright 2006 - 2010, Paul Beckingham.
+## All rights reserved.
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 2 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+## FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, write to the
+##
+##     Free Software Foundation, Inc.,
+##     51 Franklin Street, Fifth Floor,
+##     Boston, MA
+##     02110-1301
+##     USA
+##
+################################################################################
+
+use strict;
+use warnings;
+use Test::More tests => 7;
+
+# Create the rc file.
+if (open my $fh, '>', 'hook.rc')
+{
+  print $fh "data.location=.\n",
+            "hooks=on\n",
+            "hook.format-age=" . $ENV{'PWD'} . "/hook:age\n";
+  close $fh;
+  ok (-r 'hook.rc', 'Created hook.rc');
+}
+
+# Create the hook functions.
+if (open my $fh, '>', 'hook')
+{
+  print $fh "function age (name, value)\n",
+            "  value = '<' .. value .. '>'\n",
+            "  return value, 0, nil\n",
+            "end\n";
+  close $fh;
+  ok (-r 'hook', 'Created hook');
+}
+
+my $output = qx{../task rc:hook.rc version};
+if ($output =~ /PUC-Rio/)
+{
+  qx{../task rc:hook.rc add foo};
+  sleep 1;
+  $output = qx{../task rc:hook.rc list};
+
+  like ($output, qr/<\d\ssec>/, 'format-age hook age -> <age>');
+}
+else
+{
+  pass ('format-age hook age -> <age> - skip: no Lua support');
+}
+
+# Cleanup.
+unlink 'pending.data';
+ok (!-r 'pending.data', 'Removed pending.data');
+
+unlink 'undo.data';
+ok (!-r 'undo.data', 'Removed undo.data');
+
+unlink 'hook';
+ok (!-r 'hook', 'Removed hook');
+
+unlink 'hook.rc';
+ok (!-r 'hook.rc', 'Removed hook.rc');
+
+exit 0;
+
diff --git a/src/tests/hook.format-age_compact.t b/src/tests/hook.format-age_compact.t
new file mode 100755
index 000000000..409970f13
--- /dev/null
+++ b/src/tests/hook.format-age_compact.t
@@ -0,0 +1,83 @@
+#! /usr/bin/perl
+################################################################################
+## task - a command line task list manager.
+##
+## Copyright 2006 - 2010, Paul Beckingham.
+## All rights reserved.
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 2 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+## FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, write to the
+##
+##     Free Software Foundation, Inc.,
+##     51 Franklin Street, Fifth Floor,
+##     Boston, MA
+##     02110-1301
+##     USA
+##
+################################################################################
+
+use strict;
+use warnings;
+use Test::More tests => 7;
+
+# Create the rc file.
+if (open my $fh, '>', 'hook.rc')
+{
+  print $fh "data.location=.\n",
+            "hooks=on\n",
+            "hook.format-age_compact=" . $ENV{'PWD'} . "/hook:age\n",
+            "report.list.columns=id,project,priority,due,active,age_compact,description\n";
+  close $fh;
+  ok (-r 'hook.rc', 'Created hook.rc');
+}
+
+# Create the hook functions.
+if (open my $fh, '>', 'hook')
+{
+  print $fh "function age (name, value)\n",
+            "  value = '<' .. value .. '>'\n",
+            "  return value, 0, nil\n",
+            "end\n";
+  close $fh;
+  ok (-r 'hook', 'Created hook');
+}
+
+my $output = qx{../task rc:hook.rc version};
+if ($output =~ /PUC-Rio/)
+{
+  qx{../task rc:hook.rc add foo};
+  sleep 1;
+  $output = qx{../task rc:hook.rc list};
+
+  like ($output, qr/<\ds>/, 'format-age_compact hook age -> <age>');
+}
+else
+{
+  pass ('format-age_compact hook age -> <age> - skip: no Lua support');
+}
+
+# Cleanup.
+unlink 'pending.data';
+ok (!-r 'pending.data', 'Removed pending.data');
+
+unlink 'undo.data';
+ok (!-r 'undo.data', 'Removed undo.data');
+
+unlink 'hook';
+ok (!-r 'hook', 'Removed hook');
+
+unlink 'hook.rc';
+ok (!-r 'hook.rc', 'Removed hook.rc');
+
+exit 0;
+
diff --git a/src/tests/hook.format-description.t b/src/tests/hook.format-description.t
new file mode 100755
index 000000000..898a45605
--- /dev/null
+++ b/src/tests/hook.format-description.t
@@ -0,0 +1,81 @@
+#! /usr/bin/perl
+################################################################################
+## task - a command line task list manager.
+##
+## Copyright 2006 - 2010, Paul Beckingham.
+## All rights reserved.
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 2 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+## FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, write to the
+##
+##     Free Software Foundation, Inc.,
+##     51 Franklin Street, Fifth Floor,
+##     Boston, MA
+##     02110-1301
+##     USA
+##
+################################################################################
+
+use strict;
+use warnings;
+use Test::More tests => 7;
+
+# Create the rc file.
+if (open my $fh, '>', 'hook.rc')
+{
+  print $fh "data.location=.\n",
+            "hooks=on\n",
+            "hook.format-description=" . $ENV{'PWD'} . "/hook:description\n";
+  close $fh;
+  ok (-r 'hook.rc', 'Created hook.rc');
+}
+
+# Create the hook functions.
+if (open my $fh, '>', 'hook')
+{
+  print $fh "function description (name, value)\n",
+            "  value = '<' .. value .. '>'\n",
+            "  return value, 0, nil\n",
+            "end\n";
+  close $fh;
+  ok (-r 'hook', 'Created hook');
+}
+
+my $output = qx{../task rc:hook.rc version};
+if ($output =~ /PUC-Rio/)
+{
+  qx{../task rc:hook.rc add foo};
+  $output = qx{../task rc:hook.rc ls};
+
+  like ($output, qr/<foo>/, 'format-description hook foo -> <foo>');
+}
+else
+{
+  pass ('format-description hook foo -> <foo> - skip: no Lua support');
+}
+
+# Cleanup.
+unlink 'pending.data';
+ok (!-r 'pending.data', 'Removed pending.data');
+
+unlink 'undo.data';
+ok (!-r 'undo.data', 'Removed undo.data');
+
+unlink 'hook';
+ok (!-r 'hook', 'Removed hook');
+
+unlink 'hook.rc';
+ok (!-r 'hook.rc', 'Removed hook.rc');
+
+exit 0;
+
diff --git a/src/tests/hook.format-description_only.t b/src/tests/hook.format-description_only.t
new file mode 100755
index 000000000..4d1ed24c4
--- /dev/null
+++ b/src/tests/hook.format-description_only.t
@@ -0,0 +1,82 @@
+#! /usr/bin/perl
+################################################################################
+## task - a command line task list manager.
+##
+## Copyright 2006 - 2010, Paul Beckingham.
+## All rights reserved.
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 2 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+## FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, write to the
+##
+##     Free Software Foundation, Inc.,
+##     51 Franklin Street, Fifth Floor,
+##     Boston, MA
+##     02110-1301
+##     USA
+##
+################################################################################
+
+use strict;
+use warnings;
+use Test::More tests => 7;
+
+# Create the rc file.
+if (open my $fh, '>', 'hook.rc')
+{
+  print $fh "data.location=.\n",
+            "hooks=on\n",
+            "hook.format-description_only=" . $ENV{'PWD'} . "/hook:description_only\n",
+            "report.ls.columns=id,project,priority,description_only\n";
+  close $fh;
+  ok (-r 'hook.rc', 'Created hook.rc');
+}
+
+# Create the hook functions.
+if (open my $fh, '>', 'hook')
+{
+  print $fh "function description_only (name, value)\n",
+            "  value = '<' .. value .. '>'\n",
+            "  return value, 0, nil\n",
+            "end\n";
+  close $fh;
+  ok (-r 'hook', 'Created hook');
+}
+
+my $output = qx{../task rc:hook.rc version};
+if ($output =~ /PUC-Rio/)
+{
+  qx{../task rc:hook.rc add foo};
+  $output = qx{../task rc:hook.rc ls};
+
+  like ($output, qr/<foo>/, 'format-description_only hook foo -> <foo>');
+}
+else
+{
+  pass ('format-description_only hook foo -> <foo> - skip: no Lua support');
+}
+
+# Cleanup.
+unlink 'pending.data';
+ok (!-r 'pending.data', 'Removed pending.data');
+
+unlink 'undo.data';
+ok (!-r 'undo.data', 'Removed undo.data');
+
+unlink 'hook';
+ok (!-r 'hook', 'Removed hook');
+
+unlink 'hook.rc';
+ok (!-r 'hook.rc', 'Removed hook.rc');
+
+exit 0;
+
diff --git a/src/tests/hook.format-project.t b/src/tests/hook.format-project.t
new file mode 100755
index 000000000..6c2049f8e
--- /dev/null
+++ b/src/tests/hook.format-project.t
@@ -0,0 +1,81 @@
+#! /usr/bin/perl
+################################################################################
+## task - a command line task list manager.
+##
+## Copyright 2006 - 2010, Paul Beckingham.
+## All rights reserved.
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 2 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+## FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, write to the
+##
+##     Free Software Foundation, Inc.,
+##     51 Franklin Street, Fifth Floor,
+##     Boston, MA
+##     02110-1301
+##     USA
+##
+################################################################################
+
+use strict;
+use warnings;
+use Test::More tests => 7;
+
+# Create the rc file.
+if (open my $fh, '>', 'hook.rc')
+{
+  print $fh "data.location=.\n",
+            "hooks=on\n",
+            "hook.format-project=" . $ENV{'PWD'} . "/hook:project\n";
+  close $fh;
+  ok (-r 'hook.rc', 'Created hook.rc');
+}
+
+# Create the hook functions.
+if (open my $fh, '>', 'hook')
+{
+  print $fh "function project (name, value)\n",
+            "  value = '<' .. value .. '>'\n",
+            "  return value, 0, nil\n",
+            "end\n";
+  close $fh;
+  ok (-r 'hook', 'Created hook');
+}
+
+my $output = qx{../task rc:hook.rc version};
+if ($output =~ /PUC-Rio/)
+{
+  qx{../task rc:hook.rc add foo project:bar};
+  $output = qx{../task rc:hook.rc list};
+
+  like ($output, qr/<bar>/, 'format-project hook project -> <project>');
+}
+else
+{
+  pass ('format-project hook project -> <project> - skip: no Lua support');
+}
+
+# Cleanup.
+unlink 'pending.data';
+ok (!-r 'pending.data', 'Removed pending.data');
+
+unlink 'undo.data';
+ok (!-r 'undo.data', 'Removed undo.data');
+
+unlink 'hook';
+ok (!-r 'hook', 'Removed hook');
+
+unlink 'hook.rc';
+ok (!-r 'hook.rc', 'Removed hook.rc');
+
+exit 0;
+
diff --git a/src/tests/hook.format-tags.t b/src/tests/hook.format-tags.t
new file mode 100755
index 000000000..3f87504e2
--- /dev/null
+++ b/src/tests/hook.format-tags.t
@@ -0,0 +1,81 @@
+#! /usr/bin/perl
+################################################################################
+## task - a command line task list manager.
+##
+## Copyright 2006 - 2010, Paul Beckingham.
+## All rights reserved.
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 2 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+## FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, write to the
+##
+##     Free Software Foundation, Inc.,
+##     51 Franklin Street, Fifth Floor,
+##     Boston, MA
+##     02110-1301
+##     USA
+##
+################################################################################
+
+use strict;
+use warnings;
+use Test::More tests => 7;
+
+# Create the rc file.
+if (open my $fh, '>', 'hook.rc')
+{
+  print $fh "data.location=.\n",
+            "hooks=on\n",
+            "hook.format-tags=" . $ENV{'PWD'} . "/hook:tags\n";
+  close $fh;
+  ok (-r 'hook.rc', 'Created hook.rc');
+}
+
+# Create the hook functions.
+if (open my $fh, '>', 'hook')
+{
+  print $fh "function tags (name, value)\n",
+            "  value = '<' .. value .. '>'\n",
+            "  return value, 0, nil\n",
+            "end\n";
+  close $fh;
+  ok (-r 'hook', 'Created hook');
+}
+
+my $output = qx{../task rc:hook.rc version};
+if ($output =~ /PUC-Rio/)
+{
+  qx{../task rc:hook.rc add foo +t1 +t2};
+  $output = qx{../task rc:hook.rc long};
+
+  like ($output, qr/<t1 t2>/, 'format-tags hook t1 t2 -> <t1 t2>');
+}
+else
+{
+  pass ('format-tags hook t1 t2 -> <t1 t2> - skip: no Lua support');
+}
+
+# Cleanup.
+unlink 'pending.data';
+ok (!-r 'pending.data', 'Removed pending.data');
+
+unlink 'undo.data';
+ok (!-r 'undo.data', 'Removed undo.data');
+
+unlink 'hook';
+ok (!-r 'hook', 'Removed hook');
+
+unlink 'hook.rc';
+ok (!-r 'hook.rc', 'Removed hook.rc');
+
+exit 0;
+