FvwmScript

FvwmScript(1)                    Fvwm Modules                    FvwmScript(1)



NAME
       FvwmScript - module to build graphic user interface


SYNOPSIS
       FvwmScript must be spawned by Fvwm.  It will not work from the command
       line.


DESCRIPTION
       FvwmScript is a module which allows you to build many graphical
       applications such as desktop accessories, button panel with pop up
       menus, modal dialogs... At the startup, FvwmScript reads the file which
       is specified on the command line. This file contains the script.  This
       script is not included in the configuration file of Fvwm.

       An FvwmScript script is fully controllable by using the keyboard.
       (Shift)-Tab circulates around the widgets, Return simulates a mouse
       click, the arrows move the cursor or change the values of the widget
       and Escape "cancels" for Menu and PopupMenu.


INVOCATION
       FvwmScript can be invoked by inserting the line `Module FvwmScript
       name_of_script' in the .fvwm2rc file.  The file "name_of_script" can
       start with a slash, in which case, it's a fully qualified path, and the
       file is read.  If "name_of_script" does not start with a slash,
       FvwmScript will look in a few different places.  If  the   .fvwm2rc
       contained   the  command  line  `*FvwmScript: Path
       path_of_the_script_directory', FvwmScript will try that directory.  If
       that doesn't work, FvwmScript tries the system configuration directory
       and the user configuration directory as described under the "Read"
       command in the fvwm man page.

       The command to start FvwmScript can be placed on a line by itself, if
       FvwmScript is to be spawned during fvwm's initialization, or can be
       bound to a menu or mouse button or keystroke to invoke it later.


CONFIGURATION OPTIONS
       The following commands can be used in the config file (see fvwm(1),
       section MODULE COMMANDS for details). They are used only if the
       corresponding script commands are not used in the script.


       *FvwmScript: DefaultFont font
              Specifies the default font to be used. If not specified with
              this command or in the script with the Font command, fixed font
              is assumed.


       *FvwmScript: DefaultFore color
              Specifies the default foreground color to be used. If not
              specified with this command or in the script with the ForeColor
              command, black is used.


       *FvwmScript: DefaultBack color
              Specifies the default background color to be used. If not
              specified with this command or in the script with the BackColor
              command, grey85 is used.


       *FvwmScript: DefaultHilight color
              Specifies the default hilight color to be used. If not specified
              with this command or in the script with the HilightColor
              command, grey100 is used.


       *FvwmScript: DefaultShadow color
              Specifies the default shadow color to be used. If not specified
              with this command or in the script with the ShadowColor command,
              grey55 is used.


       *FvwmScript: DefaultColorset colorset
              Tells the module to use colorset colorset as the default
              colorset.


ANATOMY OF A SCRIPT
       FvwmScript uses a particular programming language. A script is composed
       of five parts. Heading contains general characteristics of the window
       and default properties for all widgets. The second part contains
       instructions whom are executed at the  startup of the script. The third
       part contains periodic tasks which are executed every second.  The
       fourth part contains instructions which are executed at exit.  And the
       last part contains the description of widgets.  A widget consists of
       eleven types of items: text labels, single-line text inputs, radio
       buttons, checkbox, push buttons, horizontal and vertical scrollbars,
       rectangles, pop up menus, swallowexecs and mini scrollbars.


HEADING OF A SCRIPT
       The syntax is as follows:


       WindowTitle string
              This option sets the window title.


       WindowSize width height
              This option sets window size. width and height are numerical
              value.


       WindowPosition x y
              This option sets window position. x and y are numerical value.


       ForeColor {color}
              This option sets the default foreground color for all widgets.


       BackColor {color}
              This option sets the default background color for all widgets.


       HilightColor {color}
              This option sets the default hilight color for all widgets.


       ShadowColor {color}
              This option sets the default shadow color for all widgets.


       Colorset {n}
              This option sets the default colorset for all widgets.


       Font {font}
              This option sets the default font for all widgets.


       UseGettext  [locale_path]
              Enable the use of the gettext mechanism which is used by the
              WindowLocaleTitle, LocaleTitle, ChangeLocaleTitle instructions
              and the Gettext function.  If no argument is given, the default
              FvwmScript locale catalog is used.  This catalog is under the
              locale fvwm installation directory and the text domain is
              FvwmScript
              (install_prefix/share/locale/*/LC_MESSAGES/FvwmScript.mo).  You
              can reset this catalog or add some catalogs exactly in the same
              way than with the LocalePath fvwm command (see the fvwm manual
              page).  This instruction should be placed before the
              WindowLocaleTitle instruction.


       WindowLocaleTitle string
              This option sets the window title, but use the locale catalog(s)
              defined with UseGettext.


INITIALISATION
       This part contains instructions which will be executed at the startup.
       For example:
       Init
        Begin
         Do "Exec cat tada.voc > /dev/dsp"
         WarpPointer 1
         Set $ToDo=Restart
        End
       These instructions are used to play a sound, move the pointer to widget
       1 and to initialize $ToDo to "Restart" at every startup.


PERIODIC TASKS
       This part of the script contains instructions that are executed every
       second.  For example:
       PeriodicTasks
        Begin
         If (RemainderOfDiv (GetTime) 10)==0 Then
          Do {Exec xcalc}
        End
       This example shows how to launch xcalc every 10 seconds.


THE QUIT FUNCTION
       This part of the script contains instructions that are executed when
       the script exits (after the Quit instruction or if you close the window
       with the Close, Delete or Destroy fvwm command). For Example
       QuitFunc
        Begin
         Do {Echo bye, bye}
        End
       Be aware that if you used the KillModule fvwm command to close the
       script, some instructions or functions which rely on the existence of a
       communication link between the script and fvwm will not be executed
       (for example the Do command). To smoothly kill a script with an fvwm
       command see the COMMANDS section.


MAIN OF A SCRIPT
       The second part of the script contains the description for every widget
       in the script.  Each widget description has two parts.  The first part
       describes initial properties, the second part contains instructions
       that are executed when the widget receives messages.  All widgets can
       send and receive messages.  All messages are identified by a number.
       The message "UserAction" is sent to a widget when the user operates the
       widget.  The syntax for the first part is:
       Widget         id   # A number between 1 and 999 inclusive
       Property
        Type          string
        Size width    height
        Position      x y
        Title         { string }
        Value         int
        MaxValue      int
        MinValue      int
        Font          string
        ForeColor     { color }
        BackColor     { color }
        HilightColor  { color }
        ShadowColor   { color }
        Colorset int
        Flags         flagsOpt
       The flagsOpt option to Flags is a space separated list containing one
       or more  of  the  keywords Hidden, NoReliefString, NoFocus, Left /
       Center / Right.  Hidden is used to specify if the widget is hidden at
       startup.  NoReliefString specifies if strings are drawn with relief or
       not.  NoFocus specifies if the widget can get the keyboard focus or
       not.  By default all widgets take focus, except Rectangle, HDipstick
       and VDipstick which cannot. Moreover, the NoFocus widgets are skipped
       when you circulate around the widgets with the (Shift-)Tab short cut.
       Left / Center / Right specifies the text position. These apply only to
       ItemDraw, List, Menu, PopupMenu and PushButton. The default is Center
       for ItemDraw and PushButton and Left for the other widgets.

       LocaleTitle can be used in place of Title, for using the locale
       catalog(s) defined with UseGettext.

       The position of every widget must be specified.

       The syntax for the second part is:
       Main
        Case message of
         SingleClic:
         Begin
          # list of instructions which will be
          # executed when widget receives
          # message "SingleClic". This message is
          # generated by the user.
         End
         1 :
         Begin
          # list of instructions which will be
          # executed when widget receives
          # message 1
         End
        End


LIST OF WIDGETS
       There is fifteen types of widgets.


       CheckBox: Display check box with a string.

              Title: title of the check box.

              Value: if Value is equal to 1, the box is checked else it is
              not.

              The Size property is ignored.


       HDipstick: Display a horizontal dipstick.
              This widget can be used to display disk usage.

              Value: specify the current value of the dipstick.

              MinValue: specify the minimum value of the dipstick.

              MaxValue: specify the maximum value of the dipstick.

              A minimum size of 30x11 is imposed.


       HScrollBar: Display an horizontal scrollbar.

              Value: position of the thumb.

              MaxValue: upper limit of Value.

              MinValue: lower limit of Value.

              The height property is ignored and a minimum width is imposed.
              The width should be at least the range plus 37 if all values are
              to be selectable e.g.  a min of 0 and max of 10 has a range of
              11 and therefore should have a minimum width of 48.


       ItemDraw: Display an icon and/or a string.

              Title: string to display.

              Icon: icon to display.

              MaxValue: x coordinate of the cursor.

              MinValue: y coordinate of the cursor.

              The size is made large enough to contain the title and/or the
              icon.


       List: Display a list.
              List lets user to choose between various options.

              Value: specify which option is selected.

              MinValue: First visible option.

              Title: title contains options displayed in the list. The syntax
              is the following: {Option 1|Option 2|...|Option N}. All menus
              are displayed at the top of window.

              A minimum height of three items is imposed and the width is made
              to be at least 108.


       Menu: Display a menu whom lets user to choose a option.
              Items of type Menu are layed out from left to right along the
              top of the window. The size and position properties are ignored.

              Value: specify which option is selected.

              Title: title contains options displayed in the menu. The syntax
              is the following: {Option 1|Option 2|...|Option N}.


       MiniScroll: Display a very small vertical scrollbar.

              Value: position of the thumb.

              MaxValue: upper limit of Value.

              MinValue: lower limit of Value.

              The size is set to 19x34.


       PopupMenu: Display a pop up menu.

              Value: specify what option is selected.

              Title: the title has the following syntax: {Option 1|Option
              2|...|Option N}."Option 1|Option 2|...|Option N" is the pop up
              menu which is displayed when pressing mouse button.

              The size property is ignored.


       PushButton: Display push button with an icon and/or a string.

              Title: this string has the following syntax {Title of the
              button|Option 1|Option 2|Option3|...|Option N}. "Option 1|Option
              2|...|Option N" is the pop up menu which is displayed when
              pressing the right button.

              Icon: icon to display.

              The button is made large enough to fit the icon and or label.


       RadioButton: Display radio button with a string.

              Title: title of the radio button.

              Value: if Value is equal to 1, the box is checked else it is
              not.

              The size property is ignored


       Rectangle: Display a rectangle.
               This type of widget can be used to decorate window.


       SwallowExec
              This type of widget causes FvwmScript to spawn an process, and
              capture the first window whose name or resource is equal to
              Title, and display it in the script window.

              Title: specify the window name which be captured and displayed
              in the script window.

              SwallowExec: specify the command line to execute to spawn the
              process.  Modules can also be swallowed.

              Value: specify the looking of the border. Possible value: -1, 0,
              1.

              The size is made to be at least 30x30


       TextField: Display a text input field.
              The text input field can be used to edit a single-line string.

              Title: content of text field.

              Value: position of the insert point.

              MinValue: position of the end of the selection.

              MaxValue: first visible character of the title

              The height property is ignored, the width is made to be at least
              40 pixels wider than the initial contents.


       VDipstick: Display a vertical dipstick.

              Value: specify the current value of the dipstick.

              MinValue: specify the minimum value of the dipstick.

              MaxValue: specify the maximum value of the dipstick.

              The size is made to be at least 11x30.


       VScrollBar: Display a vertical scrollbar.

              Value: position of the thumb.

              MaxValue: upper limit of Value.

              MinValue: lower limit of Value.

              The width property is ignored and a minimum height is imposed.
              The height should be at least the range plus 37 if all values
              are to be selectable e.g.  a min of 0 and max of 10 has a range
              of 11 and therefore should have a minimum height of 48.


INSTRUCTIONS
       Here is the description of all instructions.


       HideWidget id : hide the widget numbered id.


       ShowWidget id: show the widget numbered id.


       ChangeValue id1 id2
              Set the value of the widget numbered id1 to id2.


       ChangeMaxValue id1 id2
              Set the maximum value of the widget numbered id1 to id2.


       ChangeMinValue id1 id2
              Set the minimum value of the widget numbered id1 to id2.


       ChangeTitle id1 id2
              Set the title of the widget numbered id1 to id2.


       ChangeWindowTitle string
              Set the title of the window to string.


       ChangeWindowTitleFromArg numarg
              Set the title of the window to the value of the numarg-th script
              argument.


       ChangeLocaleTitle id1 id2
              As ChangeTitle but use the locale catalog(s) defined with
              UseGettext.


       ChangeIcon id1 id2
              Set the icon of the widget numbered id1 to id2.


       ChangeForeColor id1 {color}
              Set the foreground color of the widget numbered id1 to {color}.


       ChangeBackColor id1 {color}
              Set the background color of the widget numbered id1 to {color}.


       ChangeColorSet id1 id2
              Set the colorset of the widget numbered id1 to id2. Specifying
              widget 0 sets the main window colorset.


       ChangePosition id1 x y
              Move the widget numbered id1 to position (x,y).


       ChangeSize id1 width height
              Set the size of the widget numbered id1 to (width,height).


       ChangeFont id1 newfont
              Set the font of the widget numbered id1 to newfont.


       WarpPointer id
              Warp the mouse pointer into the widget numbered id.


       WriteToFile filename {str1} {str2} etc
              Write to the file filename the string which is the concatenation
              of all arguments str1, str2, etc.


       Do {command args}
              Execute the fvwm command inside the Do block.  Any fvwm command
              as described in the fvwm2 man page can be used.  Commands are
              sent from this module to the fvwm main program for processing.
              The length of the command and arguments can not exceed 988
              characters.


       Set $var={str1} {str2} etc
              Concatenate all arguments to a string and set the variable $var
              to this string.


       Quit: quit the program.


       SendSignal id1 id2
              Send a message numbered id2 to widget id1.


       SendToScript id_script {str11} {str2} etc
              Send a message to the script identified by id_script. The
              message is the concatenation of str1, str2...


       Key Keyname Modifier id sig str1 str2 etc
              Binds a keyboard key to the instruction

              SendSignal id sig

              and sets the "last string" to the concatenation of str1, str2...
              (see the LastString function).  The Keyname and Modifiers fields
              are defined as in the fvwm Key command.


ARGUMENTS
       Most of commands use arguments. There are two kinds of arguments:
       numbers and strings.  A numerical argument is a value which is between
       -32000 and +32000. A string is always surrounded with braces. Variables
       always begin with the character "$" and can contain both numbers and
       strings.


FUNCTIONS
       All functions use arguments. Functions can return both a string and a
       number.  The syntax is:
       (function argument1 argument2 etc)
       Here is the complete list of arguments:


       (GetTitle id)
              Return the title of the widget numbered id.


       (GetValue id)
              Return the current value of the widget numbered id.


       (GetMinValue id)
              Return the current Min value of the widget numbered id.


       (GetMaxValue id)
              Return the current Max value of the widget numbered id.


       (GetFore id)
              Return the current RGB foreground value of the widget numbered
              id in the hex format RRGGBB.


       (GetBack id)
              Return the current RGB background value of the widget numbered
              id in the hex format RRGGBB.


       (GetHilight id)
              Return the current RGB hilight value of the widget numbered id
              in the hex format RRGGBB.


       (GetShadow id)
              Return the current RGB shadow value of the widget numbered id in
              the hex format RRGGBB.


       (GetOutput {str} int1 int2)
              Executes the command str, gets the standard output and returns
              the word which is in the line int1 and in the position int2. If
              int2 is equal to -1, GetOutput returns the complete line.


       (NumToHex int)
              Return the hexadecimal value of int.


       (HexToNum {str})
              Return the decimal value of str, str must be an hexadecimal
              value.


       (Add int1 int2)
              Return the result of (int1+int2).


       (Mult int1 int2)
              Return the result of (int1*int2).


       (Div int1 int2)
              Return the result of (int1/int2).


       (StrCopy {str} int1 int2)
              Return the string whom is between position int1 and int2. For
              example, (StrCopy {Hello} 1 2) returns {He}


       (LaunchScript {str})
              This function launches the script named str and returns an
              identification number.  This number is necessary to use the
              functions SendToScript and ReceiveFromScript. The string str
              contains the script name and some arguments.


       (GetScriptArgument {int})
              This function returns the argument script used in the function
              LaunchScript.  If int is equal to zero, GetScriptArgument
              returns the name of the script.


       (GetScriptFather)
              This function returns the identification number of the script
              father.


       (ReceivFromScript {int})
              This function returns the message sent by the script numbered
              int.


       (RemainderOfDiv {int1 int2}): t
              This function returns the remainder of the division (int1/int2).


       (GetTime)
              This function returns the time in seconds.


       (GetPid)
              This function returns the process id of the script.


       (Gettext {str})
              This function return the translation of str by using the locale
              catalog(s) defined with UseGettext.


       (SendMsgAndGet {comId} {cmd} bool)
              Sends the command cmd with identifier comId to an external
              program ready to communicate with the script using a protocol
              specific to FvwmScript. If bool is 0 FvwmScript does not wait
              for an answer from the external program. In this case the
              returned value is 1 if the message can be sent to the external
              program and 0 if this is not the case.  If bool is 1, then
              FvwmScript waits for an answer from the external program and the
              return value is this answer (a line of no more than 32000
              characters). If the communication fails, the returned value is
              0.  See the section A COMMUNICATION PROTOCOL for a description
              of the communication protocol used.


       (Parse {str} int)
              where str must be a string of the form:
                   X1S1X2S2X3S3...SnXn
              where the Xn are numbers containing four decimal digits and
              where Sn are strings of length exactly Xn. The returned value is
              the string Sint.  If int is out of range (e.g., >n) the returned
              value is the empty string. If str is not of the specified form,
              the return value is unpredictable (but empty in the average).
              This function is useful to handle strings returned by the
              SendMsgAndGet function.


       (LastString)
              This function returns the "current working string" for the Key
              instruction and the SendString command (see the COMMANDS
              section). At startup this string is empty, but when a Key
              binding is detected (respectively, a SendString command is
              received), then this string is set to the string associated to
              the instruction (respectively, to the command).


CONDITIONAL LOOPS
       There are three kinds of conditional loops. The instruction "If-Then-
       Else" has the following syntax:
       If $ToDo=={Open xcalc} Then
        Do {Exec xcalc &}            # List of instructions
       Else
       Begin
        Do {Exec killall xcalc &}    # List of instructions
        Do {Exec echo xcalc killed > /dev/console}
       End
       The second part "Else-Begin-End" is optional. If the loop contains only
       one instruction, Begin and End can be omitted. The instruction "While-
       Do" has the following syntax:
       While $i<5 Do
       Begin
        Set $i=(Add i 1)             # List of instructions
       End
       Two strings can be compared with "==" and two numbers can be compared
       with "<", "<=", "==", ">=", ">". The loop "For-Do-Begin-End" has the
       following syntax:
       For $i=1 To 20 Do
       Begin
        Do {Exec xcalc &}            # List of instructions
       End


COMMANDS
       The following fvwm command may be executed at any time

       SendToModule ScriptName SendString id sig str

       it sends to any module with alias or name which matches ScriptName the
       string

       SendString id sig str

       When an FvwmScript receives such a message it sends to the Widget id
       the signal numbered sig and the string str can be obtained with the
       LastString function. Let us give an example.  Say that you have a
       script MyScript with the widget:
       Widget 50
       Property
        Type PushButton
        Title {Quit}
        ...
       Main
       Case message of

         SingleClic:
         Begin
           Quit
         End

         1 :
         Begin
           Set $str = (LastString)
           If $str == {Quit} Then
             Quit
           Else
             ChangeTitle 33 $str
         End

       End
       Then the command
       SendToModule MyScript SendString 50 1 str
       forces MyScript to exit if str is equal to "Quit" and if not it changes
       the title of Widget 33 to str.


       This command can be used to change the window title

       SendToModule ScriptName ChangeWindowTitle  newTitle [oldTitle]

       it causes that any module with alias or name which matches ScriptName
       changes its associated window title to newTitle. The optional argument
       oldTitle makes sense when there are several instances of the same
       script. It permits one to avoid changing the name  of all these
       instances by specifying the name of the window associated to the target
       script (see the example below).

       + I Module FvwmScript FvwmStorageSend "/dev/hda6"
       + I Wait FvwmStorageSend
       + I SendToModule FvwmStorageSend ChangeWindowTitle HDA6
       + I Module FvwmScript FvwmStorageSend "/dev/hda1"
       + I Wait FvwmStorageSend
       + I SendToModule FvwmStorageSend ChangeWindowTitle HDA1 FvwmStorageSend

       Without the FvwmStorageSend argument in the last case, the SendToModule
       command would have changed to HDA1 the name of both instances of
       FvwmStorageSend.



EXAMPLES
       You will find examples of scripts in the fvwm configuration directory.

       FvwmScript-BellSetup, FvwmScript-KeyboardSetup, FvwmScript-PointerSetup
       and FvwmScript-ScreenSetup are a set of scripts that modify X settings.
       These scripts save preferences into a file named ~/.xinit-fvwmrc (If
       you want to use another file name, give it as the first argument of the
       script).  If you want to load these preferences at every startup, you
       have to include the line  ".xinit-fvwmrc" in your .xinitrc (or
       .xsession) file before starting fvwm.

       FvwmScript-BaseConfig modifies fvwm focus and paging mouse policy,
       window placement, opacity and other features of the move and resize
       commands, snap attraction and shading animation.  This script saves
       preferences into a file named .FvwmBaseConfig in the user's data
       directory (i.e., $HOME/.fvwm or $FVWM_USERDIR if set).  If you want to
       load these preferences at every startup you must add the line "Read
       .FvwmBaseConfig" in your fvwm configuration file.  If you want to use
       another file name, give it as the first argument of the script.  When
       you click on Ok or Apply an fvwm function that you may define named
       BaseConfigOkFunc or BaseConfigApplyFunc is called.  This allows for
       reloading specific application styles that the script has destroyed
       (e.g., AddToFunc  BaseConfigOkFunc I Read MyAppStyle).

       FvwmScript-Buttons is a buttons panel which can replace FvwmButtons
       (this script supports popup menus and requires xload, xclock,
       FvwmPager, TkDesk).  FvwmScript-Colorset allows you to edit your
       colorset.  FvwmScript-Date allows you to set date and time.
       FvwmScript-FileBrowser is a file browser used by the other scripts.
       FvwmScript-Find is an elementary front-end to find.  FvwmScript-Quit
       allows one to quit fvwm, restart fvwm or some other window manager, or
       shut down and reboot the computer.  FvwmScript-ScreenDump is a screen
       dumper. FvwmScript-WidgetDemo is a pure example script. See the next
       section for FvwmScript-ComExample.


A COMMUNICATION PROTOCOL
       FvwmScript is a weak (but simple) programming language. If you need to
       deal with a lot of data and/or you need to use complex algorithms you
       should use an external program (in perl for example) and "send" the
       desired information to your FvwmScript script. The first approach is to
       use the GetOutput function.  This is simple but you should rerun your
       external program each time you need information from it (and this may
       cause performances problems).  The second approach is to use the
       SendMsgAndGet function which extends FvwmScript by using any
       programming language which can deal with named pipes (fifos). We
       describe this solution in this section.  (A third approach is to use
       fvwm-themes-com from the fvwm-themes package, but in fact the
       SendMsgAndGet method is an implementation of fvwm-themes-com inside
       FvwmScript and this gives better performance).

       Basically, you start an "external" program (the program for short) from
       your FvwmScript script (the script for short). This program runs in the
       background and you use the SendMsgAndGet function in your script to ask
       questions or to give instructions to the program.  The program must
       strictly respect a certain communication protocol.  First of all there
       is an identifier comId for the communication, it should contain the
       process id of the script for a good implementation of the protocol (use
       the GetPid function and pass the comId via an option to the program).
       The protocol uses two fifos, in the fvwm user directory, named: .tmp-
       com-in-comId and .tmp-com-out-comId.  The program should create and
       listen on the .tmp-com-in-comId fifo. Then, when FvwmScript executes a
       function of the form:

              Set $answer = (SendMsgAndGet {comId} {cmd} bool)

       FvwmScript writes the cmd on this fifo.  This way the program can read
       the cmd and can execute the appropriate action (it should remove the in
       fifo to support multi-communications). If bool is 0, FvwmScript does
       not wait for an answer from the program and return 1 if the previous
       actions succeed and 0 if they failed (then the program should "go back"
       to the in fifo).  If bool is 1, then FvwmScript waits (20 sec) for an
       answer from the program and in turn returns the answer to the script
       (note that bool is not passed to the program as it must know which
       commands need an answer). To answer, the program creates the .tmp-com-
       out-comId fifo and writes the answer on it. The program should wait
       until FvwmScript reads the answer and then it should remove the out
       fifo and go back to the in fifo. The answer should consist of one line
       of no more than 32000 characters (take a look at the Parse function to
       handle multiple lines as one line).

       A simple way to understand this protocol and to write scripts and
       programs that use it is to take a look at the (not useful) example
       FvwmScript-ComExample and fvwm-script-ComExample.pl (that can found in
       the fvwm data directory). Moreover, this implementation of the protocol
       solves questions as: What to do if the script exits for a bad reason?
       What to do if the program exits for a bad reason? ...etc.


BUGS
       FvwmScript crashes if widgets are accessed that have not been defined.


AUTHOR
              Frederic Cordier (cordie97@cui.unige.ch or f-cord96@univ-
       lyon1.fr).


CONTRIBUTOR
              Eddy J. Gurney (eddy@gizmo.aa.ans.net).



3rd Berkeley Distribution  06 November 2016 (2.6.8)              FvwmScript(1)