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CentOS 7.0 - man page for lefty (centos section 1)

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LEFTY(1)										 LEFTY(1)

NAME
       lefty - A Programmable Graphics Editor

SYNOPSIS
       lefty [ options ] [ file ]

DESCRIPTION
       lefty  is  a two-view graphics editor for technical pictures. This editor has no hardwired
       knowledge about specific picture layouts or editing operations.	Each picture is described
       by  a program that contains functions to draw the picture and functions to perform editing
       operations that are appropriate for the specific picture.  Primitive  user  actions,  like
       mouse and keyboard events, are also bound to functions in this program. Besides the graph-
       ical view of the picture itself, the editor presents a textual view of  the  program  that
       describes the picture. Programmability and the two-view interface allow the editor to han-
       dle a variety of pictures, but are particularly useful for pictures used in technical con-
       texts, e.g., graphs and trees. Also, lefty can communicate with other processes. This fea-
       ture allows it to use existing tools to compute specific picture layouts and allows exter-
       nal  processes  to  use the editor as a front end to display their data structures graphi-
       cally.

USAGE
       The file name is optional. It may be -, for reading from standard input.  lefty	uses  two
       environment variables, LEFTYPATH and LEFTYOPTIONS.  LEFTYPATH is a colon separated list of
       directories. When lefty tries to open a file, it searches that path  for  the  file.  When
       lefty  tries  to  start up another process, it searches LEFTYPATH first, then the standard
       PATH variable.  LEFTYOPTIONS can be used to set specific options. Options specified on the
       command line override options set through this variable.

OPTIONS
       -x     Instructs the editor to exit after processing file.

       -e <expression>
	      <expression> is parsed and executed.

       -el <num>
	      Set error reporting level. The default value is 0.  0 never prints any messages.	1
	      prints severe errors, such as trying to return from a non function.  2 is the  most
	      useful:  it reports function calls that cannot be executed, either because there is
	      no function, or because of argument mismatches.  3 also warns  about  bad  variable
	      names.   4,5  warn  about expressions that do not return a value. Only level 1 mes-
	      sages are real errors. The rest arise from  legal  lefty	statements,  but  may  be
	      caused by some logic errors.

       -sd <num>
	      Specifies  how  much  of the stack to show, when an error message is to be printed.
	      The default value is 2.  With 0, no part of the stack is shown. With  1,	only  the
	      top stack frame is printed. With 2, the full stack is printed.

       -sb <num>
	      Specifies  how much of each function in the stack to show, when an error message is
	      to be printed. The default value is 2.  With 0, no part of the function  is  shown.
	      With  1,	only the line around the error is printed. With 2, the full function body
	      is printed.

       -df <string>
	      Sets the default font. This font is used whenever a requested font cannot be found.
	      The  string  must  be  a legal X font. If string is '', lefty will draw small boxes
	      instead of text.

       -ps <file>
	      Specifies a default file name for postscript files. This name is used when no  name
	      is specified in the createwidget call. The default file name is out.ps.

       -V     Prints the version.

       -?     Prints the usage and exits.

SEE ALSO
       lefty user guide.

											 LEFTY(1)
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