New GM "batch" command

Kenneth Xu contributed a 'gm batch' command which allows running any 
number of GM commands in a sequence with the commands being specified 
at a command line with 'GM> ' prompt, from standard input, or from a 
file.  This can improve the performance quite a lot with many small 
files, and allows the processing logic to be driven by a different 
program or script.

This new feature is included in Mercurial and the latest GM snapshot 
packages, including Windows installer packages.  Please provide 
feedback prior to the next release.

The following is the usage message from 'gm batch -help', which is all 
the documentation currently available.

Usage: gm batch [options ...] [file|-]

Where options include:
   -echo on|off         echo command back to standard out, default is off
   -escape unix|windows force use Unix or Windows escape format for command line
                        argument parsing, default is platform dependent
   -fail text           when feedback is on, output the designated text if the
                        command returns error, default is 'FAIL'
   -feedback on|off     print text (see -pass and -fail options) feedback after
                        each command to indicate the result, default is off
   -help                print program options
   -pass text           when feedback is on, output the designated text if the
                        command executed successfully, default is 'PASS'
   -prompt text         use the given text as command prompt. use text 'off' or
                        empty string to turn off prompt. default to 'GM> ' if
                        and only if batch mode was entered with no file argument
   -stop-on-error on|off
                        when turned on, batch execution quits prematurely when
                        any command returns error

Unix escape allows the use backslash(\), single quote(') and double quote(") in
the command line. Windows escape only uses double quote(").  For example,

     Orignal             Unix escape              Windows escape
     [a\b\c\d]           [a\\b\\c\\d]             [a\b\c\d]
     [Text with space]   [Text\ with\ space]      ["Text with space"]
     [Text with (")]     ['Text with (")']        ["Text with ("")"]
     [Mix: "It's a (\)"] ["Mix: \"It's a (\\)\""] ["Mix: ""It's a (\)"""]

Use '-' to read command from standard input without default prompt.

Bob
-- 
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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