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.TH FVWM 2.xx "late 20th century"
.UC
.TH FvwmScript 3.1
.SH NAME
FvwmScript - module to build graphic user interface
.SH SYNOPSIS
FvwmScript must be spawned by Fvwm.  
It will not work from the command line.
.SH DESCRIPTION
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.

.SH INVOCATION
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.
.SH ANATOMY OF A SCRIPT
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.
.SH HEADING OF A SCRIPT
The syntaxe is as follow:
.TP 4
.IP "WindowTitle \fIstring\fP"
This option sets the window title.
.TP 4
.IP "WindowSize \fIwidth height\fP"
This option sets window size. \fIwidth\fP and \fIheight\fP are numerical value.
.TP 4
.IP "WindowPosition \fIx y\fP"
This option sets window position. \fIx\fP and \fIy\fP are numerical value.
.TP 4
.IP "ForeColor {\fIcolor\fP}"
This option sets the default foreground color for all widgets.
.TP 4
.IP "BackColor {\fIcolor\fP}"
This option sets the default background color for all widgets.
.TP 4
.IP "HilightColor {\fIcolor\fP}"
This option sets the default hilight color for all widgets.
.TP 4
.IP "ShadowColor {\fIcolor\fP}"
This option sets the default shadow color for all widgets.
.TP 4
.IP "Font {\fIfont\fP}"
This option sets the default font color for all widgets.

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

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

.SH MAIN OF A SCRIPT
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:
.EX
Widget		id	# Set the id widget
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 }
 Flags		Hidden and/or NoReliefString
.EE
The option 'Flags` is used to specify if the widget is hidden or not and 
if strings are drew with relief or not.

.EX
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
.EE

.SH LIST OF WIDGETS
There is fifteen types of widgets.
.TP 4
.IP "\fBItemDraw\fP: Display an icon and/or a string."

\fBTitle\fP: string to display.

\fBIcon\fP: icon to display.
.TP 4
.IP "\fBPushButton\fP: Display push button with an icon and/or a string."

\fBTitle\fP: 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.

\fBIcon\fP: icon to display.
.TP 4
.IP "\fBRadioButton\fP: Display radio button with a string."

\fBTitle\fP: title of the radio button.

\fBValue\fP: if Value is equal to 1, the box is checked else it is not.
.TP 4
.IP "\fBCheckBox\fP: Display check box with a string."

\fBTitle\fP: title of the check box.

\fBValue\fP: if Value is equal to 1, the box is checked else it is not.
.TP 4
.IP "\fBTextField\fP: Display a text input field. The text input field can be used to edit a single-line string."

\fBTitle\fP: content of text field.

\fBValue\fP: position of the insert point.
.TP 4
.IP "\fBHScrollBar\fP: Display an horizontal scrollbar."

\fBValue\fP: position of the thumb.

\fBMaxValue\fP: upper limit of Value.

\fBMinValue\fP: lower limit of Value.
.TP 4
.IP "\fBVScrollBar\fP: Display a vertical scrollbar."

\fBValue\fP: position of the thumb.

\fBMaxValue\fP: upper limit of Value.

\fBMinValue\fP: lower limit of Value.
.TP 4
.IP "\fBMiniScrollBar\fP: Display a very small vertical scrollbar."

\fBValue\fP: position of the thumb.

\fBMaxValue\fP: upper limit of Value.

\fBMinValue\fP: lower limit of Value.
.TP 4
.IP "\fBRectangle\fP: Display a rectangle. This type of widget can be used to decorate window."
.TP 4
.IP "\fBSwallowExec\fP: 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."

\fBTitle\fP: specify the window name which be captured and displayed in the script window.
 
\fBSwallowExec\fP: specify the command line to execute to spawn the process. Modules canalso be swallowed.

\fBValue\fP: specify the looking of the border. Possible value: -1, 0, 1.
.TP 4
.IP "\fBPopupMenu\fP: Display a popup menu."

\fBValue\fP: specify what option is selected.

\fBTitle\fP: 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.
.TP 4
.IP "\fBHDipstick\fP: Display a horizontal dipstick. This widget can be used to display disk usage."

\fBValue\fP: specify the current value of the dipstick.

\fBMinValue\fP: specify the minimum value of the dipstick.

\fBMaxValue\fP: specify the maximum value of the dipstick.
.TP 4
.IP "\fBVDipstick\fP: Display a vertical dipstick."

\fBValue\fP: specify the current value of the dipstick.

\fBMinValue\fP: specify the minimum value of the dipstick.

\fBMaxValue\fP: specify the maximum value of the dipstick.
.TP 4
.IP "\fBList\fP: Display a list. List lets user to choose between various options."

\fBValue\fP: specify which option is selected.

\fBTitle\fP: 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.
.TP 4
.IP "\fBMenu\fP: Display a menu whom lets user to choose a option."

\fBValue\fP: specify which option is selected.

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

.SH INSTRUCTIONS

Here is the description of all instructions.
.TP 4
.IP "HideWidget \fIid\fP : hide the widget numbered \fIid\fP."
.TP 4
.IP "ShowWidget \fIid\fP: show the widget numbered \fIid\fP."
.TP 4
.IP "ChangeValue \fIid1 id2\fP: set the value of the widget numbered \fIid1\fP to \fIid2\fP."
.TP 4
.IP "ChangeMaxValue \fIid1 id2\fP: set the maximum value of the widget numbered \fIid1\fP to \fIid2\fP."
.TP 4
.IP "ChangeMinValue \fIid1 id2\fP: set the minimum value of the widget numbered \fIid1\fP to \fIid2\fP."
.TP 4
.IP "ChangeTitle \fIid1 id2\fP: set the title of the widget numbered \fIid1\fP to \fIid2\fP."
.TP 4
.IP "ChangeIcon \fIid1 id2\fP: set the icon of the widget numbered \fIid1\fP to \fIid2\fP."
.TP 4
.IP "ChangeForeColor \fIid1\fP {\fIcolor\fP}: set the foreground color of the widget numbered \fIid1\fP to {\fIcolor\fP}."
.TP 4
.IP "ChangeBackColor \fIid1\fP {\fIcolor\fP}: set the background color of the widget numbered \fIid1\fP to {\fIcolor\fP}.
.TP 4

.IP "ChangePosition \fIid1 x y\fP: move the widget numbered \fIid1\fP to position (\fIx\fP,\fIy\fP)."
.TP 4
.IP "ChangeSize \fIid1 width height\fP: set the size of the widget numbered \fIid1\fP to (\fIwidth\fP,\fIheight\fP)."
.TP 4
.IP "ChangeFont \fIid1 newfont\fP: set the font of the widget numbered \fIid1\fP to \fInewfont\fP."
.TP 4
.IP "WarpPointer \fIid\fP: warp the mouse pointer into the widget numbered \fIid\fP."
.TP 4
.IP "WriteToFile \fIfilename\fP {\fIstr1\fP} {\fIstr2\fP} etc: write to the file \fIfilename\fP the string which is the concatenation of all arguments \fIstr1\fP, \fIstr2\fP, etc."
.TP 4
.IP "Do {\fIstr1\fP} {\fIstr2\fP} etc: execute the command which is the concatenation of all arguments \fIstr1\fP, \fIstr2\fP, etc."
.TP 4
.IP "Set $\fIvar\fP={\fIstr\fP1} {\fIstr2\fP} etc: concatenate all arguments to a string and set the variable $\fIvar\fP to this string."
.TP 4
.IP "Quit: quit the program."
.TP 4
.IP "SendSignal \fIid1 id2\fP: send a message numbered \fIid2\fP to widget \fIid1\fP."
.TP 4
.IP "SendToScript \fIid_script\fP {\fIstr1\fP1} {\fIstr2\fP} etc: send a message to the script identified by id_script. The message is the concatenation of str1, str2...

.SH ARGUMENTS
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. 

.SH FUNCTIONS
All functions are used as argument. Functions can return both string and number.
The syntax is:
.EX
(function argument1 argument2 etc)
.EE
Here is the complete list of arguments:
.TP 4
.IP "(GetTitle \fIid\fP): return the title of the widget numbered \fIid\fP."
.TP 4
.IP "(GetValue \fIid\fP): return the current value of the widget numbered \fIid\fP."
.TP 4
.IP "(GetOutput {\fIstr\fP} \fIint1 int2\fP): executes the command \fIstr\fP, gets the standart output and returns the word which is in the line \fIint1\fP and in the position \fIint2\fP. If \fIint2\fP is equal to -1, GetOutput returns the complete line."
.TP 4
.IP "(NumToHex \fIint\fP): return the hexadecimal value of \fIint\fP."
.TP 4
.IP "(HexToNum {\fIstr\fP}): return the decimal value of \fIstr\fP, \fIstr\fP must be an hexadecimal value."
.TP 4
.IP "(Add \fIint1 int2\fP): return the result of (\fIint1\fP+\fIint2\fP)."
.TP 4
.IP "(Mult \fIint1 int2\fP): return the result of (\fIint1\fP*\fIint2\fP)."
.TP 4
.IP "(Div \fIint1 int2\fP): return the result of (\fIint1\fP/\fIint2\fP)."
.TP 4
.IP "(StrCopy {\fIstr\fP} \fIint1 int2\fP): return the string whom is between position int1 and int2. For example, (StrCopy {Hello} 1 2) returns {He}"
.TP 4
.IP "(LaunchScript {\fIstr\fP}): 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."
.TP 4
.IP "(GetScriptArgument {\fIint\fP}): this function return the argument script used in the function LaunchScript. If int is equal to zero, GetScriptArgument return the name of the script."
.TP 4
.IP "(GetScriptFather): this function return the identification number of the script father."
.TP 4
.IP "(ReceivFromScript {\fIint\fP}): this function return the message sended by the script numbered int."
.TP 4
.IP "(RemainderOfDiv {\fIint1 int2\fP}): this function return the remainder of the division (\fIint1\fP/\fIint2\fP)."
.TP 4
.IP "(GetTime): this function return the time in second."

.SH CONDITIONAL LOOPS
There is three kind of conditional loops. The instruction "If-Then-Else" has the following syntax:
.EX
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
.EE
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:
.EX
While $i<5 Do
Begin
 Set $i=(Add i 1)	 		# List of instructions
End
.EE
Two strings can be compared with "==" and two numbers can be compared with "<", "<=", "==", ">=", ">". The loop "For-Do-Begin-End" has the following syntax:
.EX
For $i=1 To 20 Do
Begin
 Do {Exec xcalc &}			# List of instructions
End
.EE
.SH AUTHOR
       Frederic Cordier (cordie97@cui.unige.ch or f-cord96@univ-lyon1.fr).
.SH CONTRIBUTOR
       Eddy J. Gurney (eddy@gizmo.aa.ans.net).
