This is just a quick fix for a problem I ran into while trying to use Primitive on Windows. While trying to create a gif, you might run into a message like this:

writing test.gif
2018/06/08 14:07:20 exit status 4

1. Make sure that you have ImageMagick installed.

2. Locate the “utils.go” file in the source for primitive. On my computer it was located at C:\Users\Me\go\src\github.com\fogleman\primitive\primitive\utils.go

3. Look for this section:

        args := []string{
        "-loop", "0",
        "-delay", fmt.Sprint(delay),
        filepath.Join(dir, "*.png"),
        "-delay", fmt.Sprint(lastDelay - delay),
        filepath.Join(dir, fmt.Sprintf("%06d.png", len(frames)-1)),
        path,
    }
    cmd := exec.Command("convert", args...)
   

4. Move "convert" to the beginning of args, and change the command name to "magick"

        args := []string{
        "convert",
        "-loop", "0",
        "-delay", fmt.Sprint(delay),
        filepath.Join(dir, "*.png"),
        "-delay", fmt.Sprint(lastDelay - delay),
        filepath.Join(dir, fmt.Sprintf("%06d.png", len(frames)-1)),
        path,
    }
    cmd := exec.Command("magick", args...)
   

5. Reinstall primitive with go install github.com/fogleman/primitive (or whatever your path is in go\src)

Basically, to create the gifs primitive tries to use the magick convert command. However, windows has a default command called convert that gets used instead. These changes should fix the problem.