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.TH MRED 1 "November 2001"
.UC 4
.SH NAME
mred \- The PLT Graphical Scheme implementation
.SH SYNOPSIS
.B mred
[
.I X option ...
]
[
.I option ...
] [
.I argument ...
]

.SH DESCRIPTION
.I MrEd
is the PLT's graphical Scheme
implementation.
It embeds and extends 
.I MzScheme
with a graphical user interface (GUI) toolbox.
.PP
.I DrScheme
is the graphical development environment for creating
.I MzScheme
and
.I MrEd
applications.

.SH X OPTIONS

MrEd accepts the following standard
.I X flags
:
.B -display
.IR disp ,
.B -geometry
.IR geom ,
.B -bg
.IR color ,
.B -background
.IR color ,
.B -fg
.IR color ,
.B -foreground
.IR color ,
.B -fn
.IR font ,
.B -font
.IR font ,
.BR -iconic ,
.B -name
.IR name ,
.BR -rv ,
.BR -reverse ,
.BR +rv ,
.B -selectionTimeout
.IR time ,
.BR -synchronous ,
.B -title
.IR name ,
.B -xnllanguage
.IR lang ,
.B -xrm
.IR file .
These flags must appear before all other flags.
.PP

.SH OPTIONS

Startup file and expression switches:
.TP
.BI \-e \ expr
.TP
.BI \--eval \ expr
Evaluates
.I expr
after
.I MrEd
starts.
.TP
.BI \-f \ file
.TP
.BI \--load \ file
Loads
.I file
after
.I MrEd
starts.
.TP
.BI \-d \ file
.TP
.BI \--load-cd \ file
Load/cds
.I file
after
.I MrEd
starts.
.TP
.BI \-t \ file
.TP
.BI \--require \ file
Requires
.I file
after
.I MrEd
starts.
.TP
.B \-F
.TP
.B \--Load
.br
Loads all remaining arguments after
.I MrEd
starts.
.TP
.B \-D
.TP
.B \--Load-cd
.br
Load/cds all remaining arguments after
.I MrEd
starts.
.TP
.B \-T
.TP
.B \--Require
.br
Requires all remaining arguments after
.I MrEd
starts.
.TP
.BI \-l \ file
.TP
.BI \--mzlib \ file
Same as
.BR -e \ '(require\ (lib\ "\|\c
.I file\|\c
"))'.
.TP
.BI \-L \ file \  coll
Same as
.BR -e \ '(require\ (lib\ "\|\c
.I file\|\c
" "\|\c
.I coll\|\c
"))'.
.TP
.BI \-M \ coll
Same as
.BR -e \ '(require\ (lib\ "\|\c
.I coll\|\c
\|.ss" "\|\c
.I coll\|\c
"))'.
.TP
.B \-r
.TP
.B --script
Script mode: use as last flag for scripts.
Same as
.BR -fmv- .
.TP
.B \-i
.TP
.B --script-cd
Like -r, but also sets the directory.
Same as 
.BR -dmv- .
.TP
.B \-u
.TP
.B --require-script
Like -r, but requires a module.
Same as
.BR -tmv- .
.TP
.B \-Z
.TP
.B \--nogui
Skip "class.ss" and "mred.ss" require.
.TP
.B \-z
.TP
.B \--stdio
Use stdio REPL. Same as
.BR -ve \ '(read-eval-print-loop)'.
.TP
.B \-w
.TP
.B \--awk
Same as
.B -l
.BR awk.ss .
.TP
.BI \-k \ n \  m
Load executable-embedded code from file offset
.I n
to
.IR m .
.PP

Initialization switches:
.TP
.B \-x
.TP
.B \--no-lib-path
Does not try to set current-library-collection-paths.
.TP
.B \-q
.TP
.B \--no-init-file
Does not try to load "~/.mredrc".
.TP
.B \-A
.TP
.B \--no-argv
Does not set `argv' or `program'.
.PP

Language setting switches:
.TP
.B \-g
.TP
.B \--case-sens
Identifiers and symbols are initially case-sensitive.
.TP
.B \-s
.TP
.B \--set-undef
Set! works on undefined identifiers.
.PP

Miscellaneous switches:
.TP
.B \--
.br
No argument following this switch is used as a switch.
.TP
.B \-p
.TP
.B \--persistent
Catches AIX SIGDANGER (low page space) signal. (AIX only)
.TP
.B \-m
.TP
.B \--mute-banner
Suppresses
.BR -v / --version
text.
.TP
.B \-v
.TP
.B \--version
Suppresses the read-eval-print loop and prints version information.
.TP
.B \-V
.TP
.B \--yield
Like -v, also suppresses (yield 'wait).
.TP
.B \-h
.TP
.B \--help
Shows help for command-line arguments and exits, ignoring other switches.
.TP
.BI \-R file
.TP
.BI \--restore \ file
Restores an image; must be the only switch. (Special versions only)
.PP
Multiple single-letter switches can be collapsed, with arguments placed
after the collapsed switches; the first collapsed switch cannot be
.BR -- .
E.g.:
.B -vfme file expr
is the same as
.B -v -f file -m -e
.BR expr .
.PP
Extra arguments following the last switch are put into the Scheme global
variable `argv' as a vector of strings. The name used to start 
.I MrEd
is put into the global variable `program' as a string.
.PP
Extra arguments after a 
.B --restore
file are returned as a vector of
strings to the continuation of the `write-image-to-file' call that created
the image.
.PP
Expressions/files are evaluated/loaded in order as provided.
.PP
The current-library-collections-paths parameter is automatically set before any
expressions/files are evaluated/loaded, unless the
.B -x
or
.B --no-lib-path
switch is used.  
.PP
.PP
For further information on
.IR MrEd ,
please consult the on-line
documentation and other information available at
.PP
.ce 1
http://www.plt-scheme.org/software/mred/
.SH FILES
The file "~/.mredrc" is loaded before any provided
expressions/files are evaluated/loaded, unless the
.B -q 
or 
.B --no-init-file 
switch is used.
.PP
The library collections search path is read
from the PLTCOLLECTS environment variable
(as a colon-separated list of paths). Wherever the empty path
appears appears in PLTCOLLECTS, it is replaced with the default
collections directory. If PLTCOLLECTS is not defined, the default
collections directory is used as the only element in the search path.
.PP
.I MrEd
looks for the default collections directory as one of the 
following (tried in order):
.IP
The path in the environment variable PLTHOME is checked
for a "collects" subdirectory.
.IP
If
.I MrEd
was invoked with an absolute pathname, the directory of the invoked
executable is checked. If the executable is a link, the directory of
the referenced file is also checked, recursively following links. The
parent directories and the parent's parent directories are also
checked (in case
.I MrEd
is in a "bin" directory or a ".bin/\c
.I platform\|\c
" directory).
.IP
If
.I MrEd
is invoked with a relative pathname, the directories in the PATH
environment variable containing a file with the name of the program as
invoked (usually "MrEd") are checked. Links and parent directories are
followed as in the first case.
.IP
The "/usr/local/lib/plt/collects" directory is 
tried.
.PP
Please consult your local administrator to determine whether
the on-line documentation has been installed locally.
.SH BUGS
Submit bug reports via
.ce 1
http://bugs.plt-scheme.org/ (encouraged)
or by e-mail to
.ce 1
bugs@plt-scheme.org (discouraged)
.SH AUTHOR
.I MrEd
was implemented by Matthew Flatt (mflatt@cs.utah.edu),
Robert Bruce Findler (robby@cs.rice.edu), and
John Clements (clements@ccs.neu.edu), based on
MzScheme.
.SH SEE ALSO
.BR mzscheme(1),
.BR drscheme(1)