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      Open a device specified by TEXTOUT with unit !TEXTUNIT


      Procedure to open file for text output. The type of output
      device (disk file or terminal screen) is specified by the
      TEXTOUT keyword or the (nonstandard) system variable !TEXTOUT.

Calling Sequence

      textopen, program, [ TEXTOUT =, /STDOUT, /SILENT, MORE_SET=, WIDTH= ]


      program - scalar string giving name of program calling textopen

Optional Input Keywords

      TEXTOUT - Integer scalar (0-7) specifying output file/device to be
              opened (see below) or scalar string giving name of output file.
              If TEXTOUT is not supplied, then the (non-standard) system
              variable !TEXTOUT is used.
      /SILENT - By default, TEXTOPEN prints an informational message when
                opening a file for hardcopy output. Set /SILENT (or !QUIET)
                to suppress this message.
      /STDOUT - if this keyword is set and non-zero, then the standard output
              (unit = -1) is used for TEXTOUT=1 or TEXTOUT=2. The use
              of STDOUT has 2 possible advantages:
              (1) the output will appear in a journal file
              (2) Many Unix machines print spurious control characters when
              printing to /dev/tty. These characters are eliminated by
              setting /STDOUT
              The disadvantage of /STDOUT is that the /MORE option is not
        WIDTH - Specify line width for hardcopy output line wrapping (passed onto OPENW).

Optional Output Keyword

      MORE_SET - Returns 1 if the output unit was opened with /MORE. This
              occurs if (1) TEXTOUT = 1 and (2) the device is a tty, and
              (3) /STDOUT is not set. User can use the returned value
                of MORE_SET to determine whether to end output when user
                presses 'Q'.

Side Effects

      The following dev/file is opened for output. Different effects
      occur depending whether the standard output is a GUI (Macintosh,
      Windows, Unix/IDLTool) or a TTY
              textout=0 Nowhere
              textout=1 if a TTY then TERMINAL using /more option
                                  otherwise standard (Unit=-1) output
              textout=2 if a TTY then TERMINAL without /more option
                                  otherwise standard (Unit=-1) output
              textout=3 <program>.prt
              textout=4 laser.tmp
              textout=5 user must open file
              textout=7 same as 3 but text is appended to <program>.prt
                              file if it already exists.
              textout = filename (default extension of .prt)
      The unit to be opened is obtained with the procedure GET_LUN
      unless !TEXTOUT=5. The unit number is placed in system variable
      !TEXTUNIT. For !TEXTOUT=5 the user must set !TEXTUNIT to the
      appropriate unit number.


      When printing to a TTY terminal, the output will *not* appear in an
      IDL JOURNAL session, unlike text printed with the PRINT command.
      TEXTOPEN will automatically define the following system variables if
      they are not previously defined:


      D. Lindler Dec. 1986
      Keyword textout added, J. Isensee, July, 1990
      Made transportable, D. Neill, April, 1991
      Trim input PROGRAM string W. Landsman Feb 1993
      Don't modify TEXTOUT value W. Landsman Aug 1993
      Modified for MacOS I. Freedman April 1994
      Modified for output terminals without a TTY W. Landsman August 1995
      Added /STDOUT keyword W. Landsman April 1996
      added textout=7 option, D. Lindler, July, 1996
      Exit with RETURN instead of RETALL W. Landsman June 1999
      In IDL V5.4 filepath(/TERMINAL) not allowed in the IDLDE WL August 2001
      Added MORE_SET output keyword W.Landsman January 2002
      Added /SILENT keyword W. Landsman June 2002
Define !TEXTOUT and !TEXTUNIT if needed. R. Sterner, 2002 Aug 27
      Return Calling Sequence if no parameters supplied W.Landsman Nov 2002
      Remove VMS specific code W. Landsman Sep 2006
      Make sure MORE_SET is always defined W. Landsman Jan 2007
      Added WIDTH keyword J. Bailin Nov 2010
      Use V6.0 notation W. Landsman April 2011

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