urxvtperl(3)

NAME
urxvtperl - rxvt-unicode's embedded perl interpreter

SYNOPSIS
   # create a file grab_test in $HOME:

   sub on_sel_grab {
      warn "you selected ", $_[0]->selection;
      ()
   }

   # start a urxvt using it:

   urxvt --perl-lib $HOME -pe grab_test

DESCRIPTION
Every time a terminal object gets created, extension scripts specified via the "perl" resource are loaded and associated with it.

Scripts are compiled in a 'use strict "vars"' and 'use utf8' environment, and thus must be encoded as UTF-8.

Each script will only ever be loaded once, even in urxvtd, where scripts will be shared (but not enabled) for all terminals.

You can disable the embedded perl interpreter by setting both "perl-ext" and "perl-ext-common" resources to the empty string.

PREPACKAGED EXTENSIONS
A number of extensions are delivered with this release. You can find them in <libdir>/urxvt/perl/, and the documentation can be viewed using man urxvt-<EXTENSIONNAME>.

You can activate them like this:

  urxvt -pe <extensionname>

Or by adding them to the resource for extensions loaded by default:

  URxvt.perl-ext-common: default,selection-autotransform

Extensions may add additional resources and "actions", i.e., methods which can be bound to a key and invoked by the user. An extension can define the resources it support using so called META comments, described below. Similarly to builtin resources, extension resources can also be specified on the command line as long options (with "." replaced by "-"), in which case the corresponding extension is loaded automatically. For this to work the extension must define META comments for its resources.

API DOCUMENTATION

  General API Considerations
All objects (such as terminals, time watchers etc.) are typical reference-to-hash objects. The hash can be used to store anything you like. All members starting with an underscore (such as "_ptr" or "_hook") are reserved for internal uses and MUST NOT be accessed or modified).

When objects are destroyed on the C++ side, the perl object hashes are emptied, so its best to store related objects such as time watchers and the like inside the terminal object so they get destroyed as soon as the terminal is destroyed.

Argument names also often indicate the type of a parameter. Here are some hints on what they mean:

$text
    Rxvt-unicode's special way of encoding text, where one "unicode" character always represents one screen cell. See ROW_t for a discussion of this format.

$string
    A perl text string, with an emphasis on text. It can store all unicode characters and is to be distinguished with text encoded in a specific encoding (often locale-specific) and binary data.

$octets
    Either binary data or - more common - a text string encoded in a locale-specific way.

$keysym
    an integer that is a valid X11 keysym code. You can convert a string into a keysym and viceversa by using "XStringToKeysym" and "XKeysymToString".

  Extension Objects
Every perl extension is a perl class. A separate perl object is created for each terminal, and each terminal has its own set of extension objects, which are passed as the first parameter to hooks. So extensions can use their $self object without having to think about clashes with other extensions or other terminals, with the exception of methods and members that begin with an underscore character "_": these are reserved for internal use.

Although it isn't a "urxvt::term" object, you can call all methods of the "urxvt::term" class on this object.

Additional methods only supported for extension objects are described in the "urxvt::extension" section below.

  META comments
Rxvt-unicode recognizes special meta comments in extensions that define different types of metadata. These comments are scanned whenever a terminal is created and are typically used to autoload extensions when their resources or command line parameters are used.

Currently, it recognises only one such comment:

#:META:RESOURCE:name:type:desc
    The RESOURCE comment defines a resource used by the extension, where "name" is the resource name, "type" is the resource type, "boolean" or "string", and "desc" is the resource description.

    The extension will be autoloaded when this resource is specified or used as a command line parameter.

  Hooks
The following subroutines can be declared in extension files, and will be called whenever the relevant event happens.

The first argument passed to them is an extension object as described in the in the "Extension Objects" section.

All of these hooks must return a boolean value. If any of the called hooks returns true, then the event counts as being consumed, and the relevant action might not be carried out by the C++ code.

When in doubt, return a false value (preferably "()").

on_init $term
    Called after a new terminal object has been initialized, but before windows are created or the command gets run. Most methods are unsafe to call or deliver senseless data, as terminal size and other characteristics have not yet been determined. You can safely query and change resources and options, though. For many purposes the "on_start" hook is a better place.

on_start $term
    Called at the very end of initialisation of a new terminal, just before trying to map (display) the toplevel and returning to the main loop.

on_destroy $term
    Called whenever something tries to destroy terminal, when the terminal is still fully functional (not for long, though).

on_reset $term
    Called after the screen is "reset" for any reason, such as resizing or control sequences. Here is where you can react on changes to size-related variables.

on_child_start $term, $pid
    Called just after the child process has been "fork"ed.

on_child_exit $term, $status
    Called just after the child process has exited. $status is the status from "waitpid".

on_sel_make $term, $eventtime
    Called whenever a selection has been made by the user, but before the selection text is copied, so changes to the beginning, end or type of the selection will be honored.

    Returning a true value aborts selection making by urxvt, in which case you have to make a selection yourself by calling "$term->selection_grab".

on_sel_grab $term, $eventtime
    Called whenever a selection has been copied, but before the selection is requested from the server. The selection text can be queried and changed by calling "$term->selection".

    Returning a true value aborts selection grabbing. It will still be highlighted.

on_sel_extend $term
    Called whenever the user tries to extend the selection (e.g. with a double click) and is either supposed to return false (normal operation), or should extend the selection itself and return true to suppress the built-in processing. This can happen multiple times, as long as the callback returns true, it will be called on every further click by the user and is supposed to enlarge the selection more and more, if possible.

    See the selection example extension.

on_view_change $term, $offset
    Called whenever the view offset changes, i.e. the user or program scrolls. Offset 0 means display the normal terminal, positive values show this many lines of scrollback.

on_scroll_back $term, $lines, $saved
    Called whenever lines scroll out of the terminal area into the scrollback buffer. $lines is the number of lines scrolled out and may be larger than the scroll back buffer or the terminal.

    It is called before lines are scrolled out (so rows 0 .. min ($lines - 1, $nrow - 1) represent the lines to be scrolled out). $saved is the total number of lines that will be in the scrollback buffer.

on_osc_seq $term, $op, $args, $resp
    Called on every OSC sequence and can be used to suppress it or modify its behaviour. The default should be to return an empty list. A true value suppresses execution of the request completely. Make sure you don't get confused by recursive invocations when you output an OSC sequence within this callback.

    "on_osc_seq_perl" should be used for new behaviour.

on_osc_seq_perl $term, $args, $resp
    Called whenever the ESC ] 777 ; string ST command sequence (OSC = operating system command) is processed. Cursor position and other state information is up-to-date when this happens. For interoperability, the string should start with the extension name (sans -osc) and a semicolon, to distinguish it from commands for other extensions, and this might be enforced in the future.

    For example, "overlay-osc" uses this:

       sub on_osc_seq_perl {
          my ($self, $osc, $resp) = @_;

          return unless $osc =~ s/^overlay;//;

          ... process remaining $osc string
       }

    Be careful not ever to trust (in a security sense) the data you receive, as its source can not easily be controlled (e-mail content, messages from other users on the same system etc.).

    For responses, $resp contains the end-of-args separator used by the sender.

on_add_lines $term, $string
    Called whenever text is about to be output, with the text as argument. You can filter/change and output the text yourself by returning a true value and calling "$term->scr_add_lines" yourself. Please note that this might be very slow, however, as your hook is called for all text being output.

on_tt_write $term, $octets
    Called whenever some data is written to the tty/pty and can be used to suppress or filter tty input.

on_tt_paste $term, $octets
    Called whenever text is about to be pasted, with the text as argument. You can filter/change and paste the text yourself by returning a true value and calling "$term->tt_paste" yourself. $octets is locale-encoded.

on_line_update $term, $row
    Called whenever a line was updated or changed. Can be used to filter screen output (e.g. underline urls or other useless stuff). Only lines that are being shown will be filtered, and, due to performance reasons, not always immediately.

    The row number is always the topmost row of the line if the line spans multiple rows.

    Please note that, if you change the line, then the hook might get called later with the already-modified line (e.g. if unrelated parts change), so you cannot just toggle rendition bits, but only set them.

on_refresh_begin $term
    Called just before the screen gets redrawn. Can be used for overlay or similar effects by modifying the terminal contents in refresh_begin, and restoring them in refresh_end. The built-in overlay and selection display code is run after this hook, and takes precedence.

on_refresh_end $term
    Called just after the screen gets redrawn. See "on_refresh_begin".

on_action $term, $string
    Called whenever an action is invoked for the corresponding extension (e.g. via a "extension:string" builtin action bound to a key, see description of the keysym resource in the urxvt(1) manpage). The event is simply the action string. Note that an action event is always associated to a single extension.

on_user_command $term, $string *DEPRECATED*
    Called whenever a user-configured event is being activated (e.g. via a "perl:string" action bound to a key, see description of the keysym resource in the urxvt(1) manpage).

    The event is simply the action string. This interface is going away in preference to the "on_action" hook.

on_resize_all_windows $term, $new_width, $new_height
    Called just after the new window size has been calculated, but before windows are actually being resized or hints are being set. If this hook returns a true value, setting of the window hints is being skipped.

on_x_event $term, $event
    Called on every X event received on the vt window (and possibly other windows). Should only be used as a last resort. Most event structure members are not passed.

on_root_event $term, $event
    Like "on_x_event", but is called for events on the root window.

on_focus_in $term
    Called whenever the window gets the keyboard focus, before rxvt-unicode does focus in processing.

on_focus_out $term
    Called whenever the window loses keyboard focus, before rxvt-unicode does focus out processing.

on_configure_notify $term, $event
on_property_notify $term, $event
on_key_press $term, $event, $keysym, $octets
on_key_release $term, $event, $keysym
on_button_press $term, $event
on_button_release $term, $event
on_motion_notify $term, $event
on_map_notify $term, $event
on_unmap_notify $term, $event
    Called whenever the corresponding X event is received for the terminal. If the hook returns true, then the event will be ignored by rxvt-unicode.

    The event is a hash with most values as named by Xlib (see the XEvent manpage), with the additional members "row" and "col", which are the (real, not screen-based) row and column under the mouse cursor.

    "on_key_press" additionally receives the string rxvt-unicode would output, if any, in locale-specific encoding.

on_client_message $term, $event
on_wm_protocols $term, $event
on_wm_delete_window $term, $event
    Called when various types of ClientMessage events are received (all with format=32, WM_PROTOCOLS or WM_PROTOCOLS:WM_DELETE_WINDOW).

on_bell $term
    Called on receipt of a bell character.

  Variables in the "urxvt" Package

$urxvt::LIBDIR
    The rxvt-unicode library directory, where, among other things, the perl modules and scripts are stored.

$urxvt::RESCLASS, $urxvt::RESCLASS
    The resource class and name rxvt-unicode uses to look up X resources.

$urxvt::RXVTNAME
    The basename of the installed binaries, usually "urxvt".

$urxvt::TERM
    The current terminal. This variable stores the current "urxvt::term" object, whenever a callback/hook is executing.

@urxvt::TERM_INIT
    All code references in this array will be called as methods of the next newly created "urxvt::term" object (during the "on_init" phase). The array gets cleared before the code references that were in it are being executed, so references can push themselves onto it again if they so desire.

    This complements to the perl-eval command line option, but gets executed first.

@urxvt::TERM_EXT
    Works similar to @TERM_INIT, but contains perl package/class names, which get registered as normal extensions after calling the hooks in @TERM_INIT but before other extensions. Gets cleared just like @TERM_INIT.

  Functions in the "urxvt" Package

urxvt::fatal $errormessage
    Fatally aborts execution with the given error message (which should include a trailing newline). Avoid at all costs! The only time this is acceptable (and useful) is in the init hook, where it prevents the terminal from starting up.

urxvt::warn $string
    Calls "rxvt_warn" with the given string which should include a trailing newline. The module also overwrites the "warn" builtin with a function that calls this function.

    Using this function has the advantage that its output ends up in the correct place, e.g. on stderr of the connecting urxvtc client.

    Messages have a size limit of 1023 bytes currently.

@terms = urxvt::termlist
    Returns all urxvt::term objects that exist in this process, regardless of whether they are started, being destroyed etc., so be careful. Only term objects that have perl extensions attached will be returned (because there is no urxvt::term object associated with others).

$time = urxvt::NOW
    Returns the "current time" (as per the event loop).

urxvt::CurrentTime
urxvt::ShiftMask, LockMask, ControlMask, Mod1Mask, Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask, Button1Mask, Button2Mask, Button3Mask, Button4Mask, Button5Mask, AnyModifier
urxvt::NoEventMask, KeyPressMask, KeyReleaseMask, ButtonPressMask, ButtonReleaseMask, EnterWindowMask, LeaveWindowMask, PointerMotionMask, PointerMotionHintMask, Button1MotionMask, Button2MotionMask, Button3MotionMask, Button4MotionMask, Button5MotionMask, ButtonMotionMask, KeymapStateMask, ExposureMask, VisibilityChangeMask, StructureNotifyMask, ResizeRedirectMask, SubstructureNotifyMask, SubstructureRedirectMask, FocusChangeMask, PropertyChangeMask, ColormapChangeMask, OwnerGrabButtonMask
urxvt::KeyPress, KeyRelease, ButtonPress, ButtonRelease, MotionNotify, EnterNotify, LeaveNotify, FocusIn, FocusOut, KeymapNotify, Expose, GraphicsExpose, NoExpose, VisibilityNotify, CreateNotify, DestroyNotify, UnmapNotify, MapNotify, MapRequest, ReparentNotify, ConfigureNotify, ConfigureRequest, GravityNotify, ResizeRequest, CirculateNotify, CirculateRequest, PropertyNotify, SelectionClear, SelectionRequest, SelectionNotify, ColormapNotify, ClientMessage, MappingNotify
    Various constants for use in X calls and event processing.

urxvt::PrivMode_132, PrivMode_132OK, PrivMode_rVideo, PrivMode_relOrigin, PrivMode_Screen, PrivMode_Autowrap, PrivMode_aplCUR, PrivMode_aplKP, PrivMode_HaveBackSpace, PrivMode_BackSpace, PrivMode_ShiftKeys, PrivMode_VisibleCursor, PrivMode_MouseX10, PrivMode_MouseX11, PrivMode_scrollBar, PrivMode_TtyOutputInh, PrivMode_Keypress, PrivMode_smoothScroll, PrivMode_vt52, PrivMode_LFNL, PrivMode_MouseBtnEvent, PrivMode_MouseAnyEvent, PrivMode_BracketPaste, PrivMode_ExtMouseUTF8, PrivMode_ExtMouseUrxvt, PrivMode_BlinkingCursor, PrivMode_mouse_report, PrivMode_Default
    Constants for checking DEC private modes.

  RENDITION
Rendition bitsets contain information about colour, font, font styles and similar information for each screen cell.

The following "macros" deal with changes in rendition sets. You should never just create a bitset, you should always modify an existing one, as they contain important information required for correct operation of rxvt-unicode.

$rend = urxvt::DEFAULT_RSTYLE
    Returns the default rendition, as used when the terminal is starting up or being reset. Useful as a base to start when creating renditions.

$rend = urxvt::OVERLAY_RSTYLE
    Return the rendition mask used for overlays by default.

$rendbit = urxvt::RS_Bold, urxvt::RS_Italic, urxvt::RS_Blink, urxvt::RS_RVid, urxvt::RS_Uline
    Return the bit that enabled bold, italic, blink, reverse-video and underline, respectively. To enable such a style, just logically OR it into the bitset.

$foreground = urxvt::GET_BASEFG $rend
$background = urxvt::GET_BASEBG $rend
    Return the foreground/background colour index, respectively.

$rend = urxvt::SET_FGCOLOR $rend, $new_colour
$rend = urxvt::SET_BGCOLOR $rend, $new_colour
$rend = urxvt::SET_COLOR $rend, $new_fg, $new_bg
    Replace the foreground/background colour in the rendition mask with the specified one.

$value = urxvt::GET_CUSTOM $rend
    Return the "custom" value: Every rendition has 5 bits for use by extensions. They can be set and changed as you like and are initially zero.

$rend = urxvt::SET_CUSTOM $rend, $new_value
    Change the custom value.

  The "urxvt::term::extension" class
Each extension attached to a terminal object is represented by a "urxvt::term::extension" object.

You can use these objects, which are passed to all callbacks to store any state related to the terminal and extension instance.

The methods (And data members) documented below can be called on extension objects, in addition to call methods documented for the <urxvt::term> class.

$urxvt_term = $self->{term}
    Returns the "urxvt::term" object associated with this instance of the extension. This member must not be changed in any way.

$self->enable ($hook_name => $cb[, $hook_name => $cb..])
    Dynamically enable the given hooks (named without the "on_" prefix) for this extension, replacing any hook previously installed via "enable" in this extension.

    This is useful when you want to overwrite time-critical hooks only temporarily.

    To install additional callbacks for the same hook, you can use the "on" method of the "urxvt::term" class.

$self->disable ($hook_name[, $hook_name..])
    Dynamically disable the given hooks.

$guard = $self->on ($hook_name => $cb[, $hook_name => $cb..])
    Similar to the "enable" enable, but installs additional callbacks for the given hook(s) (that is, it doesn't replace existing callbacks), and returns a guard object. When the guard object is destroyed the callbacks are disabled again.

$self->bind_action ($hotkey, $action)
$self->x_resource ($pattern)
$self->x_resource_boolean ($pattern)
    These methods support an additional "%" prefix for $action or $pattern when called on an extension object, compared to the "urxvt::term" methods of the same name - see the description of these methods in the "urxvt::term" class for details.

  The "urxvt::anyevent" Class
The sole purpose of this class is to deliver an interface to the "AnyEvent" module - any module using it will work inside urxvt without further programming. The only exception is that you cannot wait on condition variables, but non-blocking condvar use is ok.

In practical terms this means is that you cannot use blocking APIs, but the non-blocking variant should work.

  The "urxvt::term" Class

$term = new urxvt::term $envhashref, $rxvtname, [arg...]
    Creates a new terminal, very similar as if you had started it with system "$rxvtname, arg...". $envhashref must be a reference to a %ENV-like hash which defines the environment of the new terminal.

    Croaks (and probably outputs an error message) if the new instance couldn't be created. Returns "undef" if the new instance didn't initialise perl, and the terminal object otherwise. The "init" and "start" hooks will be called before this call returns, and are free to refer to global data (which is race free).

$term->destroy
    Destroy the terminal object (close the window, free resources etc.). Please note that urxvt will not exit as long as any event watchers (timers, io watchers) are still active.

$term->exec_async ($cmd[, @args])
    Works like the combination of the "fork"/"exec" builtins, which executes ("starts") programs in the background. This function takes care of setting the user environment before exec'ing the command (e.g. "PATH") and should be preferred over explicit calls to "exec" or "system".

    Returns the pid of the subprocess or "undef" on error.

$isset = $term->option ($optval[, $set])
    Returns true if the option specified by $optval is enabled, and optionally change it. All option values are stored by name in the hash %urxvt::OPTION. Options not enabled in this binary are not in the hash.

    Here is a likely non-exhaustive list of option names, please see the source file /src/optinc.h to see the actual list:

     borderLess buffered console cursorBlink cursorUnderline hold iconic
     insecure intensityStyles iso14755 iso14755_52 jumpScroll loginShell
     mapAlert meta8 mouseWheelScrollPage override_redirect pastableTabs
     pointerBlank reverseVideo scrollBar scrollBar_floating scrollBar_right
     scrollTtyKeypress scrollTtyOutput scrollWithBuffer secondaryScreen
     secondaryScroll skipBuiltinGlyphs skipScroll transparent tripleclickwords
     urgentOnBell utmpInhibit visualBell

$value = $term->resource ($name[, $newval])
    Returns the current resource value associated with a given name and optionally sets a new value. Setting values is most useful in the "init" hook. Unset resources are returned and accepted as "undef".

    The new value must be properly encoded to a suitable character encoding before passing it to this method. Similarly, the returned value may need to be converted from the used encoding to text.

    Resource names are as defined in src/rsinc.h. Colours can be specified as resource names of the form "color+<index>", e.g. "color+5". (will likely change).

    Please note that resource strings will currently only be freed when the terminal is destroyed, so changing options frequently will eat memory.

    Here is a likely non-exhaustive list of resource names, not all of which are supported in every build, please see the source file /src/rsinc.h to see the actual list:

      answerbackstring backgroundPixmap backspace_key blurradius
      boldFont boldItalicFont borderLess buffered chdir color cursorBlink
      cursorUnderline cutchars delete_key depth display_name embed ext_bwidth
      fade font geometry hold iconName iconfile imFont imLocale inputMethod
      insecure int_bwidth intensityStyles iso14755 iso14755_52 italicFont
      jumpScroll letterSpace lineSpace loginShell mapAlert meta8 modifier
      mouseWheelScrollPage name override_redirect pastableTabs path perl_eval
      perl_ext_1 perl_ext_2 perl_lib pointerBlank pointerBlankDelay
      preeditType print_pipe pty_fd reverseVideo saveLines scrollBar
      scrollBar_align scrollBar_floating scrollBar_right scrollBar_thickness
      scrollTtyKeypress scrollTtyOutput scrollWithBuffer scrollstyle
      secondaryScreen secondaryScroll shade skipBuiltinGlyphs skipScroll
      term_name title transient_for transparent tripleclickwords urgentOnBell
      utmpInhibit visualBell

$value = $term->x_resource ($pattern)
    Returns the X-Resource for the given pattern, excluding the program or class name, i.e. "$term->x_resource ("boldFont")" should return the same value as used by this instance of rxvt-unicode. Returns "undef" if no resource with that pattern exists.

    Extensions that define extra resources also need to call this method to access their values.

    If the method is called on an extension object (basically, from an extension), then the special prefix "%." will be replaced by the name of the extension and a dot, and the lone string "%" will be replaced by the extension name itself. This makes it possible to code extensions so you can rename them and get a new set of resources without having to change the actual code.

    This method should only be called during the "on_start" hook, as there is only one resource database per display, and later invocations might return the wrong resources.

$value = $term->x_resource_boolean ($pattern)
    Like "x_resource", above, but interprets the string value as a boolean and returns 1 for true values, 0 for false values and "undef" if the resource or option isn't specified.

    You should always use this method to parse boolean resources.

$action = $term->lookup_keysym ($keysym, $state)
    Returns the action bound to key combination "($keysym, $state)", if a binding for it exists, and "undef" otherwise.

$success = $term->bind_action ($key, $action)
    Adds a key binding exactly as specified via a "keysym" resource. See the "keysym" resource in the urxvt(1) manpage.

    To add default bindings for actions, an extension should call "->bind_action" in its "init" hook for every such binding. Doing it in the "init" hook allows users to override or remove the binding again.

    Example: the "searchable-scrollback" by default binds itself on "Meta-s", using "$self->bind_action", which calls "$term->bind_action".

       sub init {
          my ($self) = @_;

          $self->bind_action ("M-s" => "%:start");
       }

$rend = $term->rstyle ([$new_rstyle])
    Return and optionally change the current rendition. Text that is output by the terminal application will use this style.

($row, $col) = $term->screen_cur ([$row, $col])
    Return the current coordinates of the text cursor position and optionally set it (which is usually bad as applications don't expect that).

($row, $col) = $term->selection_mark ([$row, $col])
($row, $col) = $term->selection_beg ([$row, $col])
($row, $col) = $term->selection_end ([$row, $col])
    Return the current values of the selection mark, begin or end positions.

    When arguments are given, then the selection coordinates are set to $row and $col, and the selection screen is set to the current screen.

$screen = $term->selection_screen ([$screen])
    Returns the current selection screen, and then optionally sets it.

$term->selection_make ($eventtime[, $rectangular])
    Tries to make a selection as set by "selection_beg" and "selection_end". If $rectangular is true (default: false), a rectangular selection will be made. This is the preferred function to make a selection.

$success = $term->selection_grab ($eventtime[, $clipboard])
    Try to acquire ownership of the primary (clipboard if $clipboard is true) selection from the server. The corresponding text can be set with the next method. No visual feedback will be given. This function is mostly useful from within "on_sel_grab" hooks.

$oldtext = $term->selection ([$newtext, $clipboard])
    Return the current selection (clipboard if $clipboard is true) text and optionally replace it by $newtext.

$term->selection_clear ([$clipboard])
    Revoke ownership of the primary (clipboard if $clipboard is true) selection.

$term->overlay_simple ($x, $y, $text)
    Create a simple multi-line overlay box. See the next method for details.

$term->overlay ($x, $y, $width, $height[, $rstyle[, $border]])
    Create a new (empty) overlay at the given position with the given width/height. $rstyle defines the initial rendition style (default: "OVERLAY_RSTYLE").

    If $border is 2 (default), then a decorative border will be put around the box.

    If either $x or $y is negative, then this is counted from the right/bottom side, respectively.

    This method returns an urxvt::overlay object. The overlay will be visible as long as the perl object is referenced.

    The methods currently supported on "urxvt::overlay" objects are:

    $overlay->set ($x, $y, $text[, $rend])
        Similar to "$term->ROW_t" and "$term->ROW_r" in that it puts text in rxvt-unicode's special encoding and an array of rendition values at a specific position inside the overlay.

        If $rend is missing, then the rendition will not be changed.

    $overlay->hide
        If visible, hide the overlay, but do not destroy it.

    $overlay->show
        If hidden, display the overlay again.

$popup = $term->popup ($event)
    Creates a new "urxvt::popup" object that implements a popup menu. The $event must be the event causing the menu to pop up (a button event, currently).

$cellwidth = $term->strwidth ($string)
    Returns the number of screen-cells this string would need. Correctly accounts for wide and combining characters.

$octets = $term->locale_encode ($string)
    Convert the given text string into the corresponding locale encoding.

$string = $term->locale_decode ($octets)
    Convert the given locale-encoded octets into a perl string.

$term->scr_xor_span ($beg_row, $beg_col, $end_row, $end_col[, $rstyle])
    XORs the rendition values in the given span with the provided value (default: "RS_RVid"), which MUST NOT contain font styles. Useful in refresh hooks to provide effects similar to the selection.

$term->scr_xor_rect ($beg_row, $beg_col, $end_row, $end_col[, $rstyle1[, $rstyle2]])
    Similar to "scr_xor_span", but xors a rectangle instead. Trailing whitespace will additionally be xored with the $rstyle2, which defaults to "RS_RVid | RS_Uline", which removes reverse video again and underlines it instead. Both styles MUST NOT contain font styles.

$term->scr_bell
    Ring the bell!

$term->scr_add_lines ($string)
    Write the given text string to the screen, as if output by the application running inside the terminal. It may not contain command sequences (escape codes - see "cmd_parse" for that), but is free to use line feeds, carriage returns and tabs. The string is a normal text string, not in locale-dependent encoding.

    Normally its not a good idea to use this function, as programs might be confused by changes in cursor position or scrolling. Its useful inside a "on_add_lines" hook, though.

$term->scr_change_screen ($screen)
    Switch to given screen - 0 primary, 1 secondary.

$term->cmd_parse ($octets)
    Similar to "scr_add_lines", but the argument must be in the locale-specific encoding of the terminal and can contain command sequences (escape codes) that will be interpreted.

$term->tt_write ($octets)
    Write the octets given in $octets to the tty (i.e. as user input to the program, see "cmd_parse" for the opposite direction). To pass characters instead of octets, you should convert your strings first to the locale-specific encoding using "$term->locale_encode".

$term->tt_write_user_input ($octets)
    Like "tt_write", but should be used when writing strings in response to the user pressing a key, to invoke the additional actions requested by the user for that case ("tt_write" doesn't do that).

    The typical use case would be inside "on_action" hooks.

$term->tt_paste ($octets)
    Write the octets given in $octets to the tty as a paste, converting NL to CR and bracketing the data with control sequences if bracketed paste mode is set.

$old_events = $term->pty_ev_events ([$new_events])
    Replaces the event mask of the pty watcher by the given event mask. Can be used to suppress input and output handling to the pty/tty. See the description of "urxvt::timer->events". Make sure to always restore the previous value.

$fd = $term->pty_fd
    Returns the master file descriptor for the pty in use, or -1 if no pty is used.

$windowid = $term->parent
    Return the window id of the toplevel window.

$windowid = $term->vt
    Return the window id of the terminal window.

$term->vt_emask_add ($x_event_mask)
    Adds the specified events to the vt event mask. Useful e.g. when you want to receive pointer events all the times:

       $term->vt_emask_add (urxvt::PointerMotionMask);

$term->set_urgency ($set)
    Enable/disable the urgency hint on the toplevel window.

$term->focus_in
$term->focus_out
$term->key_press ($state, $keycode[, $time])
$term->key_release ($state, $keycode[, $time])
    Deliver various fake events to to terminal.

$window_width = $term->width ([$new_value])
$window_height = $term->height ([$new_value])
$font_width = $term->fwidth ([$new_value])
$font_height = $term->fheight ([$new_value])
$font_ascent = $term->fbase ([$new_value])
$terminal_rows = $term->nrow ([$new_value])
$terminal_columns = $term->ncol ([$new_value])
$has_focus = $term->focus ([$new_value])
$is_mapped = $term->mapped ([$new_value])
$max_scrollback = $term->saveLines ([$new_value])
$nrow_plus_saveLines = $term->total_rows ([$new_value])
$topmost_scrollback_row = $term->top_row ([$new_value])
    Return various integers describing terminal characteristics. If an argument is given, changes the value and returns the previous one.

$x_display = $term->display_id
    Return the DISPLAY used by rxvt-unicode.

$lc_ctype = $term->locale
    Returns the LC_CTYPE category string used by this rxvt-unicode.

$env = $term->env
    Returns a copy of the environment in effect for the terminal as a hashref similar to "\%ENV".

@envv = $term->envv
    Returns the environment as array of strings of the form "VAR=VALUE".

@argv = $term->argv
    Return the argument vector as this terminal, similar to @ARGV, but includes the program name as first element.

$modifiermask = $term->ModLevel3Mask
$modifiermask = $term->ModMetaMask
$modifiermask = $term->ModNumLockMask
    Return the modifier masks corresponding to the "ISO Level 3 Shift" (often AltGr), the meta key (often Alt) and the num lock key, if applicable.

$screen = $term->current_screen
    Returns the currently displayed screen (0 primary, 1 secondary).

$cursor_is_hidden = $term->hidden_cursor
    Returns whether the cursor is currently hidden or not.

$priv_modes = $term->priv_modes
    Returns a bitset with the state of DEC private modes.

    Example:

      if ($term->priv_modes & urxvt::PrivMode_mouse_report) {
          # mouse reporting is turned on
      }

$view_start = $term->view_start ([$newvalue])
    Returns the row number of the topmost displayed line. Maximum value is 0, which displays the normal terminal contents. Lower values scroll this many lines into the scrollback buffer.

$term->want_refresh
    Requests a screen refresh. At the next opportunity, rxvt-unicode will compare the on-screen display with its stored representation. If they differ, it redraws the differences.

    Used after changing terminal contents to display them.

$term->refresh_check
    Checks if a refresh has been requested and, if so, schedules one.

$text = $term->ROW_t ($row_number[, $new_text[, $start_col]])
    Returns the text of the entire row with number $row_number. Row "$term->top_row" is the topmost terminal line, row "$term->nrow-1" is the bottommost terminal line. Nothing will be returned if a nonexistent line is requested.

    If $new_text is specified, it will replace characters in the current line, starting at column $start_col (default 0), which is useful to replace only parts of a line. The font index in the rendition will automatically be updated.

    $text is in a special encoding: tabs and wide characters that use more than one cell when displayed are padded with $urxvt::NOCHAR (chr 65535) characters. Characters with combining characters and other characters that do not fit into the normal text encoding will be replaced with characters in the private use area.

    You have to obey this encoding when changing text. The advantage is that "substr" and similar functions work on screen cells and not on characters.

    The methods "$term->special_encode" and "$term->special_decode" can be used to convert normal strings into this encoding and vice versa.

$rend = $term->ROW_r ($row_number[, $new_rend[, $start_col]])
    Like "$term->ROW_t", but returns an arrayref with rendition bitsets. Rendition bitsets contain information about colour, font, font styles and similar information. See also "$term->ROW_t".

    When setting rendition, the font mask will be ignored.

    See the section on RENDITION, above.

$length = $term->ROW_l ($row_number[, $new_length])
    Returns the number of screen cells that are in use ("the line length"). Unlike the urxvt core, this returns "$term->ncol" if the line is joined with the following one.

$bool = $term->is_longer ($row_number)
    Returns true if the row is part of a multiple-row logical "line" (i.e. joined with the following row), which means all characters are in use and it is continued on the next row (and possibly a continuation of the previous row(s)).

$line = $term->line ($row_number)
    Create and return a new "urxvt::line" object that stores information about the logical line that row $row_number is part of. It supports the following methods:

    $text = $line->t ([$new_text])
        Returns or replaces the full text of the line, similar to "ROW_t"

    $rend = $line->r ([$new_rend])
        Returns or replaces the full rendition array of the line, similar to "ROW_r"

    $length = $line->l
        Returns the length of the line in cells, similar to "ROW_l".

    $rownum = $line->beg
    $rownum = $line->end
        Return the row number of the first/last row of the line, respectively.

    $offset = $line->offset_of ($row, $col)
        Returns the character offset of the given row|col pair within the logical line. Works for rows outside the line, too, and returns corresponding offsets outside the string.

    ($row, $col) = $line->coord_of ($offset)
        Translates a string offset into terminal coordinates again.

$text = $term->special_encode $string
    Converts a perl string into the special encoding used by rxvt-unicode, where one character corresponds to one screen cell. See "$term->ROW_t" for details.

$string = $term->special_decode $text
    Converts rxvt-unicodes text representation into a perl string. See "$term->ROW_t" for details.

$success = $term->grab_button ($button, $modifiermask[, $window = $term->vt])
$term->ungrab_button ($button, $modifiermask[, $window = $term->vt])
    Register/unregister a synchronous button grab. See the XGrabButton manpage.

$success = $term->grab ($eventtime[, $sync])
    Calls XGrabPointer and XGrabKeyboard in asynchronous (default) or synchronous ($sync is true). Also remembers the grab timestamp.

$term->allow_events_async
    Calls XAllowEvents with AsyncBoth for the most recent grab.

$term->allow_events_sync
    Calls XAllowEvents with SyncBoth for the most recent grab.

$term->allow_events_replay
    Calls XAllowEvents with both ReplayPointer and ReplayKeyboard for the most recent grab.

$term->ungrab
    Calls XUngrabPointer and XUngrabKeyboard for the most recent grab. Is called automatically on evaluation errors, as it is better to lose the grab in the error case as the session.

$atom = $term->XInternAtom ($atom_name[, $only_if_exists])
$atom_name = $term->XGetAtomName ($atom)
@atoms = $term->XListProperties ($window)
($type,$format,$octets) = $term->XGetWindowProperty ($window, $property)
$term->XChangeProperty ($window, $property, $type, $format, $octets)
$term->XDeleteProperty ($window, $property)
$window = $term->DefaultRootWindow
$term->XReparentWindow ($window, $parent, [$x, $y])
$term->XMapWindow ($window)
$term->XUnmapWindow ($window)
$term->XMoveResizeWindow ($window, $x, $y, $width, $height)
($x, $y, $child_window) = $term->XTranslateCoordinates ($src, $dst, $x, $y)
$term->XChangeInput ($window, $add_events[, $del_events])
$keysym = $term->XStringToKeysym ($string)
$string = $term->XKeysymToString ($keysym)
    Various X or X-related functions. The $term object only serves as the source of the display, otherwise those functions map more-or-less directly onto the X functions of the same name.

  The "urxvt::popup" Class

$popup->add_title ($title)
    Adds a non-clickable title to the popup.

$popup->add_separator ([$sepchr])
    Creates a separator, optionally using the character given as $sepchr.

$popup->add_button ($text, $cb)
    Adds a clickable button to the popup. $cb is called whenever it is selected.

$popup->add_toggle ($text, $initial_value, $cb)
    Adds a toggle/checkbox item to the popup. The callback gets called whenever it gets toggled, with a boolean indicating its new value as its first argument.

$popup->show
    Displays the popup (which is initially hidden).

  The "urxvt::timer" Class
This class implements timer watchers/events. Time is represented as a fractional number of seconds since the epoch. Example:

   $term->{overlay} = $term->overlay (-1, 0, 8, 1, urxvt::OVERLAY_RSTYLE, 0);
   $term->{timer} = urxvt::timer
                    ->new
                    ->interval (1)
                    ->cb (sub {
                       $term->{overlay}->set (0, 0,
                          sprintf "%2d:%02d:%02d", (localtime urxvt::NOW)[2,1,0]);
                    });

$timer = new urxvt::timer
    Create a new timer object in started state. It is scheduled to fire immediately.

$timer = $timer->cb (sub { my ($timer) = @_; ... })
    Set the callback to be called when the timer triggers.

$timer = $timer->set ($tstamp[, $interval])
    Set the time the event is generated to $tstamp (and optionally specifies a new $interval).

$timer = $timer->interval ($interval)
    By default (and when $interval is 0), the timer will automatically stop after it has fired once. If $interval is non-zero, then the timer is automatically rescheduled at the given intervals.

$timer = $timer->start
    Start the timer.

$timer = $timer->start ($tstamp[, $interval])
    Set the event trigger time to $tstamp and start the timer. Optionally also replaces the interval.

$timer = $timer->after ($delay[, $interval])
    Like "start", but sets the expiry timer to c<urxvt::NOW + $delay>.

$timer = $timer->stop
    Stop the timer.

  The "urxvt::iow" Class
This class implements io watchers/events. Example:

  $term->{socket} = ...
  $term->{iow} = urxvt::iow
                 ->new
                 ->fd (fileno $term->{socket})
                 ->events (urxvt::EV_READ)
                 ->start
                 ->cb (sub {
                   my ($iow, $revents) = @_;
                   # $revents must be 1 here, no need to check
                   sysread $term->{socket}, my $buf, 8192
                      or end-of-file;
                 });

$iow = new urxvt::iow
    Create a new io watcher object in stopped state.

$iow = $iow->cb (sub { my ($iow, $reventmask) = @_; ... })
    Set the callback to be called when io events are triggered. $reventmask is a bitset as described in the "events" method.

$iow = $iow->fd ($fd)
    Set the file descriptor (not handle) to watch.

$iow = $iow->events ($eventmask)
    Set the event mask to watch. The only allowed values are "urxvt::EV_READ" and "urxvt::EV_WRITE", which might be ORed together, or "urxvt::EV_NONE".

$iow = $iow->start
    Start watching for requested events on the given handle.

$iow = $iow->stop
    Stop watching for events on the given file handle.

  The "urxvt::iw" Class
This class implements idle watchers, that get called automatically when the process is idle. They should return as fast as possible, after doing some useful work.

$iw = new urxvt::iw
    Create a new idle watcher object in stopped state.

$iw = $iw->cb (sub { my ($iw) = @_; ... })
    Set the callback to be called when the watcher triggers.

$timer = $timer->start
    Start the watcher.

$timer = $timer->stop
    Stop the watcher.

  The "urxvt::pw" Class
This class implements process watchers. They create an event whenever a process exits, after which they stop automatically.

   my $pid = fork;
   ...
   $term->{pw} = urxvt::pw
                    ->new
                    ->start ($pid)
                    ->cb (sub {
                       my ($pw, $exit_status) = @_;
                       ...
                    });

$pw = new urxvt::pw
    Create a new process watcher in stopped state.

$pw = $pw->cb (sub { my ($pw, $exit_status) = @_; ... })
    Set the callback to be called when the timer triggers.

$pw = $timer->start ($pid)
    Tells the watcher to start watching for process $pid.

$pw = $pw->stop
    Stop the watcher.

ENVIRONMENT

  URXVT_PERL_VERBOSITY
This variable controls the verbosity level of the perl extension. Higher numbers indicate more verbose output.

== 0 - fatal messages
>= 3 - script loading and management
>=10 - all called hooks
>=11 - hook return values

AUTHOR
 Marc Lehmann <schmorp@schmorp.de>
 http://software.schmorp.de/pkg/rxvt-unicode