[OpenSPARC-T2-DV] / tools / perl-5.8.0 / man / man3 / Tk::CmdLine.3

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.\" ========================================================================
.\"
.IX Title "CMDLINE 1"
.TH CMDLINE 1 "2000-12-30" "perl v5.8.0" "User Contributed Perl Documentation"
.SH "NAME"
Tk::CmdLine \- Process standard X11 command line options and set initial resources
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  Tk::CmdLine::SetArguments([@argument]);
.Ve
.PP
.Vb 1
\&  my $value = Tk::CmdLine::cget([$option]);
.Ve
.PP
.Vb 1
\&  Tk::CmdLine::SetResources((\e@resource | $resource) [, $priority]);
.Ve
.PP
.Vb 5
\&  Tk::CmdLine::LoadResources(
\&      [ -symbol   => $symbol     ]
\&      [ -file     => $fileSpec   ]
\&      [ -priority => $priority   ]
\&      [ -echo     => $fileHandle ] );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Process standard X11 command line options and set initial resources.
.PP
The X11R5 man page for X11 says: \*(L"Most X programs attempt to use the same names
for command line options and arguments. All applications written with the
X Toolkit Intrinsics automatically accept the following options: ...\*(R".
This module processes these command line options for perl/Tk applications
using the \f(CW\*(C`SetArguments\*(C'\fR function.
.PP
This module can optionally be used to load initial resources explicitly via
function \f(CW\*(C`SetResources\*(C'\fR, or from specified files (default: the standard X11
application-specific resource files) via function \f(CW\*(C`LoadResources\*(C'\fR.
.Sh "Command Line Options"
.IX Subsection "Command Line Options"
.IP "\fB\-background\fR \fIColor\fR | \fB\-bg\fR \fIColor\fR" 4
.IX Item "-background Color | -bg Color"
Specifies the color to be used for the window background.
.IP "\fB\-class\fR \fIClass\fR" 4
.IX Item "-class Class"
Specifies the class under which resources for the application should be found.
This option is useful in shell aliases to distinguish between invocations
of an application, without resorting to creating links to alter the executable
file name.
.IP "\fB\-display\fR \fIDisplay\fR | \fB\-screen\fR \fIDisplay\fR" 4
.IX Item "-display Display | -screen Display"
Specifies the name of the X server to be used.
.IP "\fB\-font\fR \fIFont\fR | \fB\-fn\fR \fIFont\fR" 4
.IX Item "-font Font | -fn Font"
Specifies the font to be used for displaying text.
.IP "\fB\-foreground\fR \fIColor\fR | \fB\-fg\fR \fIColor\fR" 4
.IX Item "-foreground Color | -fg Color"
Specifies the color to be used for text or graphics.
.IP "\fB\-geometry\fR \fIGeometry\fR" 4
.IX Item "-geometry Geometry"
Specifies the initial size and location of the \fIfirst\fR
MainWindow.
.IP "\fB\-iconic\fR" 4
.IX Item "-iconic"
Indicates that the user would prefer that the application's windows initially
not be visible as if the windows had been immediately iconified by the user.
Window managers may choose not to honor the application's request.
.IP "\fB\-motif\fR" 4
.IX Item "-motif"
Specifies that the application should adhere as closely as possible to Motif
look-and-feel standards. For example, active elements such as buttons and
scrollbar sliders will not change color when the pointer passes over them.
.IP "\fB\-name\fR \fIName\fR" 4
.IX Item "-name Name"
Specifies the name under which resources for the application should be found.
This option is useful in shell aliases to distinguish between invocations
of an application, without resorting to creating links to alter the executable
file name.
.IP "\fB\-synchronous\fR" 4
.IX Item "-synchronous"
Indicates that requests to the X server should be sent synchronously, instead of
asynchronously. Since Xlib normally buffers requests to the server, errors do
do not necessarily get reported immediately after they occur. This option turns
off the buffering so that the application can be debugged. It should never
be used with a working program.
.IP "\fB\-title\fR \fITitleString\fR" 4
.IX Item "-title TitleString"
This option specifies the title to be used for this window. This information is
sometimes used by a window manager to provide some sort of header identifying
the window.
.IP "\fB\-xrm\fR \fIResourceString\fR" 4
.IX Item "-xrm ResourceString"
Specifies a resource pattern and value to override any defaults. It is also
very useful for setting resources that do not have explicit command line
arguments.
.Sp
The \fIResourceString\fR is of the form <\fIpattern\fR>:<\fIvalue\fR>,
that is (the first) ':' is used to determine which part is pattern and which
part is value. The (<\fIpattern\fR>, <\fIvalue\fR>) pair is entered
into the options database with \fBoptionAdd\fR (for each
MainWindow configured), with \fIinteractive\fR priority.
.Sh "Initial Resources"
.IX Subsection "Initial Resources"
There are several mechanism for initializing the resource database to be used
by an X11 application. Resources may be defined in a $\f(CW\*(C`HOME\*(C'\fR/.Xdefaults file,
a system application defaults file (e.g.
/usr/lib/X11/app\-defaults/<\fB\s-1CLASS\s0\fR>),
or a user application defaults file (e.g. $\f(CW\*(C`HOME\*(C'\fR/<\fB\s-1CLASS\s0\fR>).
The Tk::CmdLine functionality for setting initial resources concerns itself
with the latter two.
.PP
Resource files contain data lines of the form
<\fIpattern\fR>:<\fIvalue\fR>.
They may also contain blank lines and comment lines (denoted
by a ! character as the first non-blank character). Refer to option
for a description of <\fIpattern\fR>:<\fIvalue\fR>.
.IP "System Application Defaults Files" 4
.IX Item "System Application Defaults Files"
System application defaults files may be specified via environment variable
$\f(CW\*(C`XFILESEARCHPATH\*(C'\fR which, if set, contains a colon-separated list of file
patterns.
.IP "User Application Defaults Files" 4
.IX Item "User Application Defaults Files"
User application defaults files may be specified via environment variables
$\f(CW\*(C`XUSERFILESEARCHPATH\*(C'\fR, $\f(CW\*(C`XAPPLRESDIR\*(C'\fR or $\f(CW\*(C`HOME\*(C'\fR.
.SH "METHODS"
.IX Header "METHODS"
.IP "\fBSetArguments\fR" 4
.IX Item "SetArguments"
Extract the X11 options contained in a specified array (@ARGV by default).
.Sp
.Vb 1
\&  Tk::CmdLine::SetArguments([@argument])
.Ve
.Sp
The X11 options may be specified using a single dash \fI\-\fR as per the X11
convention, or using two dashes \fI\-\-\fR as per the \s-1POSIX\s0 standard (e.g.
\&\fB\-geometry\fR \fI100x100\fR, \fB\-geometry\fR \fI100x100\fR or \fB\-geometry=\fR\fI100x100\fR).
The options may be interspersed with other options or arguments.
A \fI\-\-\fR by itself terminates option processing.
.Sp
By default, command line options are extracted from \f(CW@ARGV\fR the first time
a MainWindow is created. The Tk::MainWindow constructor indirectly invokes
\&\f(CW\*(C`SetArguments\*(C'\fR to do this.
.IP "\fBcget\fR" 4
.IX Item "cget"
Get the value of a configuration option specified via \f(CW\*(C`SetArguments\*(C'\fR.
(\f(CW\*(C`cget\*(C'\fR first invokes \f(CW\*(C`SetArguments\*(C'\fR if it has not already been invoked.)
.Sp
.Vb 1
\&  Tk::CmdLine::cget([$option])
.Ve
.Sp
The valid options are: \fB\-class\fR, \fB\-name\fR, \fB\-screen\fR and \fB\-title\fR.
If no option is specified, \fB\-class\fR is implied.
.Sp
A typical use of \f(CW\*(C`cget\*(C'\fR might be to obtain the application class in order
to define the name of a resource file to be loaded in via \f(CW\*(C`LoadResources\*(C'\fR.
.Sp
.Vb 1
\&  my $class = Tk::CmdLine::cget(); # process command line and return class
.Ve
.IP "\fBSetResources\fR" 4
.IX Item "SetResources"
Set the initial resources.
.Sp
.Vb 1
\&  Tk::CmdLine::SetResources((\e@resource | $resource) [, $priority])
.Ve
.Sp
A single resource may be specified using a string of the form
\&'<\fIpattern\fR>:<\fIvalue\fR>'. Multiple resources may be specified
by passing an array reference whose elements are either strings of the above
form, and/or anonymous arrays of the form [ <\fIpattern\fR>,
<\fIvalue\fR> ]. The optional second argument specifies the priority,
as defined in option, to be associated with the resources
(default: \fIuserDefault\fR).
.Sp
Note that \f(CW\*(C`SetResources\*(C'\fR first invokes \f(CW\*(C`SetArguments\*(C'\fR if it has not already
been invoked.
.IP "\fBLoadResources\fR" 4
.IX Item "LoadResources"
Load initial resources from one or more files.
.Sp
.Vb 5
\&  Tk::CmdLine::LoadResources(
\&      [ -symbol   => $symbol     ]
\&      [ -file     => $fileSpec   ]
\&      [ -priority => $priority   ]
\&      [ -echo     => $fileHandle ] );
.Ve
.Sp
[ \fB\-symbol\fR => \f(CW$symbol\fR ] specifies the name of an environment variable
that, if set, defines a colon-separated list of one or more directories and/or
file patterns. $\f(CW\*(C`XUSERFILESEARCHPATH\*(C'\fR is a special case.
If $\f(CW\*(C`XUSERFILESEARCHPATH\*(C'\fR is not set, $\f(CW\*(C`XAPPLRESDIR\*(C'\fR is checked instead.
If $\f(CW\*(C`XAPPLRESDIR\*(C'\fR is not set, $\f(CW\*(C`HOME\*(C'\fR is checked instead.
.Sp
An item is identified as a file pattern if it contains one or more /%[A\-Za\-z]/
patterns. Only patterns \fB%L\fR, \fB%T\fR and \fB%N\fR are currently recognized. All
others are replaced with the null string. Pattern \fB%L\fR is translated into
$\f(CW\*(C`LANG\*(C'\fR. Pattern \fB%T\fR is translated into \fIapp-defaults\fR. Pattern \fB%N\fR is
translated into the application class name.
.Sp
Each file pattern, after substitutions are applied, is assumed to define a
FileSpec to be examined.
.Sp
When a directory is specified, FileSpecs
<\fB\s-1DIRECTORY\s0\fR>/<\fB\s-1LANG\s0\fR>/<\fB\s-1CLASS\s0\fR>
and <\fB\s-1DIRECTORY\s0\fR>/<\fB\s-1CLASS\s0\fR> are defined, in that order.
.Sp
[ \fB\-file\fR => \f(CW$fileSpec\fR ] specifies a resource file to be loaded in.
The file is silently skipped if if does not exist, or if it is not readable.
.Sp
[ \fB\-priority\fR => \f(CW$priority\fR ] specifies the priority, as defined in
option, to be associated with the resources
(default: \fIuserDefault\fR).
.Sp
[ \fB\-echo\fR => \f(CW$fileHandle\fR ] may be used to specify that a line should be
printed to the corresponding FileHandle (default: \e*STDOUT) everytime a file
is examined / loaded.
.Sp
If no \fB\-symbol\fR or \fB\-file\fR options are specified, \f(CW\*(C`LoadResources\*(C'\fR
processes symbol $\f(CW\*(C`XFILESEARCHPATH\*(C'\fR with priority \fIstartupFile\fR and
$\f(CW\*(C`XUSERFILESEARCHPATH\*(C'\fR with priority \fIuserDefault\fR.
(Note that $\f(CW\*(C`XFILESEARCHPATH\*(C'\fR and $\f(CW\*(C`XUSERFILESEARCHPATH\*(C'\fR are supposed to
contain only patterns. $\f(CW\*(C`XAPPLRESDIR\*(C'\fR and $\f(CW\*(C`HOME\*(C'\fR are supposed to be a single
directory. \f(CW\*(C`LoadResources\*(C'\fR does not check/care whether this is the case.)
.Sp
For each set of FileSpecs, \f(CW\*(C`LoadResources\*(C'\fR examines each FileSpec to
determine if the file exists and is readable. The first file that meets this
criteria is read in and \f(CW\*(C`SetResources\*(C'\fR is invoked.
.Sp
Note that \f(CW\*(C`LoadResources\*(C'\fR first invokes \f(CW\*(C`SetArguments\*(C'\fR if it has not already
been invoked.
.SH "NOTES"
.IX Header "NOTES"
This module is an object-oriented module whose methods can be invoked as object
methods, class methods or regular functions. This is accomplished via an
internally-maintained object reference which is created as necessary, and which
always points to the last object used. \f(CW\*(C`SetArguments\*(C'\fR, \f(CW\*(C`SetResources\*(C'\fR and
\&\f(CW\*(C`LoadResources\*(C'\fR return the object reference.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
.IP "1" 4
.IX Item "1"
@ARGV is processed by Tk::CmdLine at MainWindow creation.
.Sp
.Vb 1
\&  use Tk;
.Ve
.Sp
.Vb 1
\&  # <Process @ARGV - ignoring all X11-specific options>
.Ve
.Sp
.Vb 1
\&  my $mw = MainWindow->new();
.Ve
.Sp
.Vb 1
\&  MainLoop();
.Ve
.IP "2" 4
.IX Item "2"
@ARGV is processed by Tk::CmdLine before MainWindow creation.
An \f(CW@ARGV\fR of (\-\-geometry=100x100 \-opt1 a b c \-bg red)
is equal to (\-opt1 a b c) after \f(CW\*(C`SetArguments\*(C'\fR is invoked.
.Sp
.Vb 1
\&  use Tk;
.Ve
.Sp
.Vb 1
\&  Tk::CmdLine::SetArguments(); # Tk::CmdLine->SetArguments() works too
.Ve
.Sp
.Vb 1
\&  # <Process @ARGV - not worrying about X11-specific options>
.Ve
.Sp
.Vb 1
\&  my $mw = MainWindow->new();
.Ve
.Sp
.Vb 1
\&  MainLoop();
.Ve
.IP "3" 4
.IX Item "3"
Just like 2) except that default arguments are loaded first.
.Sp
.Vb 1
\&  use Tk;
.Ve
.Sp
.Vb 2
\&  Tk::CmdLine::SetArguments(qw(-name test -iconic));
\&  Tk::CmdLine::SetArguments();
.Ve
.Sp
.Vb 1
\&  # <Process @ARGV - not worrying about X11-specific options>
.Ve
.Sp
.Vb 1
\&  my $mw = MainWindow->new();
.Ve
.Sp
.Vb 1
\&  MainLoop();
.Ve
.IP "4" 4
.IX Item "4"
@ARGV is processed by Tk::CmdLine before MainWindow creation.
Standard resource files are loaded in before MainWindow creation.
.Sp
.Vb 1
\&  use Tk;
.Ve
.Sp
.Vb 1
\&  Tk::CmdLine::SetArguments();
.Ve
.Sp
.Vb 1
\&  # <Process @ARGV - not worrying about X11-specific options>
.Ve
.Sp
.Vb 1
\&  Tk::CmdLine::LoadResources();
.Ve
.Sp
.Vb 1
\&  my $mw = MainWindow->new();
.Ve
.Sp
.Vb 1
\&  MainLoop();
.Ve
.IP "5" 4
.IX Item "5"
@ARGV is processed by Tk::CmdLine before MainWindow creation.
Standard resource files are loaded in before MainWindow creation
using non-default priorities.
.Sp
.Vb 1
\&  use Tk;
.Ve
.Sp
.Vb 1
\&  Tk::CmdLine::SetArguments();
.Ve
.Sp
.Vb 1
\&  # <Process @ARGV - not worrying about X11-specific options>
.Ve
.Sp
.Vb 4
\&  Tk::CmdLine::LoadResources(-echo => \e*STDOUT,
\&      -priority => 65, -symbol => 'XFILESEARCHPATH' );
\&  Tk::CmdLine::LoadResources(-echo => \e*STDOUT,
\&      -priority => 75, -symbol => 'XUSERFILESEARCHPATH' );
.Ve
.Sp
.Vb 1
\&  my $mw = MainWindow->new();
.Ve
.Sp
.Vb 1
\&  MainLoop();
.Ve
.IP "6" 4
.IX Item "6"
@ARGV is processed by Tk::CmdLine before MainWindow creation.
Standard resource files are loaded in before MainWindow creation.
Individual resources are also loaded in before MainWindow creation.
.Sp
.Vb 1
\&  use Tk;
.Ve
.Sp
.Vb 1
\&  Tk::CmdLine::SetArguments();
.Ve
.Sp
.Vb 1
\&  # <Process @ARGV - not worrying about X11-specific options>
.Ve
.Sp
.Vb 1
\&  Tk::CmdLine::LoadResources();
.Ve
.Sp
.Vb 3
\&  Tk::CmdLine::SetResources( # set a single resource
\&      '*Button*background: red',
\&      'widgetDefault' );
.Ve
.Sp
.Vb 3
\&  Tk::CmdLine::SetResources( # set multiple resources
\&      [ '*Button*background: red', '*Button*foreground: blue' ],
\&      'widgetDefault' );
.Ve
.Sp
.Vb 1
\&  my $mw = MainWindow->new();
.Ve
.Sp
.Vb 1
\&  MainLoop();
.Ve
.SH "ENVIRONMENT"
.IX Header "ENVIRONMENT"
.IP "\fB\s-1HOME\s0\fR (optional)" 4
.IX Item "HOME (optional)"
Home directory which may contain user application defaults files as
$\f(CW\*(C`HOME\*(C'\fR/$\f(CW\*(C`LANG\*(C'\fR/<\fB\s-1CLASS\s0\fR> or $\f(CW\*(C`HOME\*(C'\fR/<\fB\s-1CLASS\s0\fR>.
.IP "\fB\s-1LANG\s0\fR (optional)" 4
.IX Item "LANG (optional)"
The current language (default: \fIC\fR).
.IP "\fB\s-1XFILESEARCHPATH\s0\fR (optional)" 4
.IX Item "XFILESEARCHPATH (optional)"
Colon-separated list of FileSpec patterns used in defining
system application defaults files.
.IP "\fB\s-1XUSERFILESEARCHPATH\s0\fR (optional)" 4
.IX Item "XUSERFILESEARCHPATH (optional)"
Colon-separated list of FileSpec patterns used in defining
user application defaults files.
.IP "\fB\s-1XAPPLRESDIR\s0\fR (optional)" 4
.IX Item "XAPPLRESDIR (optional)"
Directory containing user application defaults files as
$\f(CW\*(C`XAPPLRESDIR\*(C'\fR/$\f(CW\*(C`LANG\*(C'\fR/<\fB\s-1CLASS\s0\fR> or
$\f(CW\*(C`XAPPLRESDIR\*(C'\fR/<\fB\s-1CLASS\s0\fR>.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
MainWindow
option
.SH "HISTORY"
.IX Header "HISTORY"
.IP "\(bu" 4
1999.03.04 Ben Pavon <ben.pavon@hsc.hac.com>
.Sp
Rewritten as an object-oriented module.
.Sp
Allow one to process command line options in a specified array (@ARGV by default).
Eliminate restrictions on the format and location of the options within the array
(previously the X11 options could not be specified in \s-1POSIX\s0 format and had to be
at the beginning of the array).
.Sp
Added the \f(CW\*(C`SetResources\*(C'\fR and \f(CW\*(C`LoadResources\*(C'\fR functions to allow the definition
of resources prior to MainWindow creation.