Interpolating commands into commands is a useful pattern as well:
cmd = `convert`
if haskey(opts, :density)
cmd = `$cmd -density $(opts[:density])`
end
if haskey(opts, :depth)
cmd = `$cmd -depth $(opts[:depth])`
end
run(cmd)
On Thu, Nov 3, 2016 at 12:21 PM, Yichao Yu <yyc1...@gmail.com> wrote:
> On Thu, Nov 3, 2016 at 12:17 PM, Andre Bieler <andre.biele...@gmail.com>
> wrote:
> > I want to generate a command for imagemagick and use options loaded from
> a
> > file.
> > So the number of utilized options is not known beforehand.
> >
> > An example might look like:
> >
> > convert -density 300 somefile.pdf -depth 10 somefile.jpeg
> >
> > It is easy to generate the string above, but when interpolating it
> > into a command it gets quoted because of the spaces.
> >
> > So
> >
> > s = "convert -density 300 somefile.pdf -depth 10 somefile.jpeg"
> > run(`$s`)
> >
> > does not work. Is there an easy way to omit quoting?
> > Or how to generate the command when having vectors of keyword : value
> pairs
> > such as
> >
> > kw = ["-density", "-depth"]
> > vals = [300, 8]
> >
> > (assuming for now that all these options simply follow each other in one
> > place of
> > the command)
> >
> > Thanks for the help.
>
> Interpolate in the command and not the string
>
> you can do `command $option` where option is a string or an array of
> string.
>
> >
> > Andre
>
