System.cmd should call magick mogrify instead of mogrify

[Ziinc]

When using the portable binary version of imagemagick, the correct command on unix systems is magick mogrify.

https://github.com/route/mogrify/blob/master/lib/mogrify.ex#L381

the direct call to mogrify would only apply when installed from source (if i'm not mistaken).
I receive the following error tuple when attempting to save using Mogrify.save/2:

{:error, %ErlangError{original: :enoent}}

Full error is as follows:

iex(1)> Mogrify.open("~/Downloads/test.jpg") |> Mogrify.save()
** (ErlangError) Erlang error: :enoent
    (elixir) lib/system.ex:791: System.cmd("mogrify", ["-write", "/tmp/255784-test.jpg", "/home/ziinc/Downloads/test.jpg"], [stderr_to_stdout: true])
    (mogrify) lib/mogrify.ex:28: Mogrify.save/2
iex(1)> 

I have tried writing a bash function in ~/.bashrc that points to magick but I think System.cmd calls the sh instead.

[mchavezi]

In case someone else comes across this issue, I am not sure this is related, but I was able to solve similar error I was having only when using Docker container (Homebrew works fine). I had to add imagemagick-dev as well imagemagick to final build to fix.

[talklittle]

This library adds ImageMagick executable path configuration support in v0.8.0 (#89). Hopefully that helps with this issue.

[talklittle]

This is manageable by adding to config.exs:

config :mogrify, mogrify_command: [
    path: "magick",
    args: ["mogrify"]
]
config :mogrify, convert_command: [
    path: "magick",
    args: ["convert"]
]
config :mogrify, identify_command: [
    path: "magick",
    args: ["identify"]
]