/usr/share/gnudatalanguage/coyote/cghasimagemagick.pro is in gdl-coyote 2016.11.13-2.
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;
; NAME:
; cgHasImageMagick
;
; PURPOSE:
; Searches for the ImageMagick "convert" command to see if ImageMagick is available
; on the system.
;
;******************************************************************************************;
; ;
; Copyright (c) 2011, by Fanning Software Consulting, Inc. All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
;
;+
; :Description:
; Searches for the ImageMagick "convert" command to see if ImageMagick is available
; on the system.
;
; :Categories:
; Utilities
;
; :Keywords:
; version: out, optional, type=string
; Returns the version number of the ImageMagick convert command, if found.
;
; :Examples:
; Used to determine if the ImageMagick convert command is available::
; IDL> available = cgHasImageMagick(Version=version)
; IDL> IF available THEN Print, version
;
; :Author:
; FANNING SOFTWARE CONSULTING::
; David W. Fanning
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: david@idlcoyote.com
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; :History:
; Change History::
; Written, 17 January 2011. DWF.
;
; :Copyright:
; Copyright (c) 2011, Fanning Software Consulting, Inc.
;-
FUNCTION cgHasImageMagick, VERSION=version
; Silent error handler. If anything goes wrong, we definitely
; can't use ImageMagick.
Catch, theError
IF theError NE 0 THEN BEGIN
Return, 0
ENDIF
; Assume failure.
retval = 0
; To search for ImageMagick, I am going to spawn a call to convert.
; If the error_result is a null string, I assume this command worked.
; Otherwise, it didn't find ImageMagick.
Spawn, 'convert -version', result, error_result
; If nothing is put in the error result, then we are good to go.
IF error_result[0] EQ "" THEN retval = 1
; For some reason Macs can't deal with the version number.
IF retval EQ 1 && Arg_Present(version) THEN BEGIN
parts = StrSplit(result[0], /EXTRACT)
IF StrUpCase(!Version.OS) NE "DARWIN" THEN version = parts[2]
ENDIF
RETURN, retval
END
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