FvwmScript






FvwmScript ‐ module to build graphic user interface

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

FvwmScript is a module which allows to build many graphical applications such as
desktop accessories, button panel with popup menu, modal dialog... At the
startup, FvwmScript reads the file which is specified in the command line. This
file contains the script.  This script is not included in the configuration file
of Fvwm.


FvwmScript can be invoked by inserting the line ‘Module FvwmScript
name_of_script’ in the .fvwmrc file. All scripts used by FvwmScript are located
in a directory whom is specified in .fvwmrc by the command line ‘*FvwmScriptPath
path_of_the_script_directory’.  This 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. Fvwm will search directory
specified in the ModulePath configuration option to attempt to locate
FvwmScript.

Be sure to set ModulePath in your .fvwmrc file to include FvwmScript’s path.

FvwmScript uses a particular programming langage. A script is composed of four
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
whom is executed every 1 second. And the last one contains the desciption 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, popup‐menus, swallowexecs and mini scrollbars.

The syntaxe is as follow:


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.











                                       ‐2‐


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


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


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


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.


This part of the script contains some instructions whom are executed every
second.  For example:

     Periodic Task
      Begin
       If (RemainderOfDiv (GetTime) 10)==0 Then
        Do {Exec xcalc}
      End

This example shows how to launch xcalc every 10 seconds.


The second part of the script contains the description for every widget which
will be used in the program.  A description of widget is composed of two parts.
Fisrt part describes initial properties and second part contains instructions
which will be executed when the widget receives  messages.  All widgets can send
and receive messages. All message are identify by a number. The message
"UserAction" is sent to a widget when user has altered this one. The syntax is
as following:

     Widget         id   # Set the id widget
     Property
      Type          string
      Size width    height
      Position      x y
      Title         { string }
      Value         int
      MaxValue      int









                                       ‐3‐


      MinValue      int
      Font          string
      ForeColor     { color }
      BackColor     { color }
      HilightColor  { color }
      ShadowColor   { Color }
      Flags         Hidden and/or NoReliefString

The option ’Flags‘ is used to specify if the widget is hidden or not and if
strings are drew with relief or not.


     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



There is fifteen types of widgets.


ItemDraw: Display an icon and/or a string.

     Title: string to display.

     Icon: icon to display.


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
     popup menu which is displayed when pressing the right button.

     Icon: icon to display.


RadioButton: Display radio button with a string.

     Title: title of the radio button.










                                       ‐4‐


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


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.


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.


HScrollBar: Display an horizontal scrollbar.

     Value: position of the thumb.

     MaxValue: upper limit of Value.

     MinValue: lower limit of Value.


VScrollBar: Display a vertical scrollbar.

     Value: position of the thumb.

     MaxValue: upper limit of Value.

     MinValue: lower limit of Value.


MiniScrollBar: Display a very small vertical scrollbar.

     Value: position of the thumb.

     MaxValue: upper limit of Value.

     MinValue: lower limit of Value.


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









                                       ‐5‐


     script window.

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

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


PopupMenu: Display a popup 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 popup menu which is displayed
     when pressing mouse button.


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.


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.


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

     Value: specify which option is selected.

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


Menu: Display a menu whom lets user to choose a option.

     Value: specify which option is selected.

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












                                       ‐6‐




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.


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}.



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.











                                       ‐7‐


Do {str1} {str2} etc: execute the command which is the concatenation of all
     arguments str1, str2, etc.


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...


Most of commands use arguments. There is two kinds of argument: numbers and
strings.  A numerical argument is a value which is between ‐32000 and +32000. A
string is always surrounded with brace. Variables always begin with the
character "$" and can contains both number and string.


All functions are used as argument. Functions can return both string and 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.


(GetOutput {str} int1 int2): executes the command str, gets the standart 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).












                                       ‐8‐


(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 launch the script named str and return an
     identification number. This number is necessary to use these functions
     SendToScript and ReceivFromScript. The string str contains the script name
     and some arguments.


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


(GetScriptFather): this function return the identification number of the script
     father.


(ReceivFromScript {int}): this function return the message sended by the script
     numbered int.


(RemainderOfDiv {int1 int2}): this function return the remainder of the division
     (int1/int2).


(GetTime): this function return the time in second.


There is three kind 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" as the
following syntax:

     While $i<5 Do
     Begin
      Set $i=(Add i 1)             # List of instructions









                                       ‐9‐


     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



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


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