[BUG] whereis -b not supported on macOS

[HaleTom]

Issue observed in the following shell(s):

• Bash
• Zsh

Describe the bug
Upon shell startup:

whereis: illegal option -- b
usage: whereis program [...]
Can't use SmartCd: fzf not found !

I suggest you do:

is_cmd () {
        command -v "$1" >&/dev/null
}

and then:

	if is_cmd fdfind; then

Expected behaviour
No error

[CodesOfRishi]

I think this can fail if the expected executable name that I am passing to command -v is not an installed executable, but an alias!

[CodesOfRishi]

I'm not sure, but I think I should go with the hash command instead.

[HaleTom]

You're right on the aliases!

To avoid the "determine and remember" overhead of re-hashing, when I want to get a binary's path, I use:

bin_path () {
        if [[ -n ${ZSH_VERSION:-} ]]; then
                builtin whence -cp "$1" 2> /dev/null
        else
                builtin type -P "$1"
        fi
}

Tweaking for silent, return value only:

has_bin () {
        if [[ -n ${ZSH_VERSION:-} ]]; then
                builtin whence -cp "$1" >& /dev/null
        else
                builtin type -P "$1"  >& /dev/null
        fi
}

[CodesOfRishi]

The concern regarding re-hashing is moved to another issue #22.