tadd gif option to render command - Granular.jl - Julia package for granular dynamics simulation
 (HTM) git clone git://src.adamsgaard.dk/Granular.jl
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       ---
 (DIR) commit 284dbb12779afde341987a96c35c8cf4b0bee2bc
 (DIR) parent 45f3f14973f267dc21f19b4fd84bb7d36f1fc528
 (HTM) Author: Anders Damsgaard <andersd@riseup.net>
       Date:   Wed, 15 Nov 2017 21:15:49 -0500
       
       add gif option to render command
       
       Diffstat:
         M src/io.jl                           |       7 +++++--
       
       1 file changed, 5 insertions(+), 2 deletions(-)
       ---
 (DIR) diff --git a/src/io.jl b/src/io.jl
       t@@ -921,13 +921,16 @@ from the shell using the supplied `pvpython` argument.
        * `pvpython::String`: path to the `pvpython` executable to use.  By default, the
            script uses the pvpython in the system PATH.
        * `images::Bool`: render images to disk (default: true)
       -* `animation::Bool`: render animation to disk (default: false)
       +* `gif::Bool`: merge images as GIF and save to disk (default: false, requires
       +    `images=true`)
       +* `animation::Bool`: render animation as AVI to disk (default: false)
        * `trim::Bool`: trim images in animated sequence (default: true)
        * `reverse::Bool`: if `images=true` additionally render reverse-animated gif
            (default: false)
        """
        function render(simulation::Simulation; pvpython::String="pvpython",
                        images::Bool=true,
       +                gif::Bool=false,
                        animation::Bool=false,
                        trim::Bool=true,
                        reverse::Bool=false)
       t@@ -938,7 +941,7 @@ function render(simulation::Simulation; pvpython::String="pvpython",
                run(`$(pvpython) $(simulation.id)/$(simulation.id).py`)
        
                # if available, use imagemagick to create gif from images
       -        if images
       +        if images && gif
                    try
                        trim_string = ""
                        if trim