Make sure script doesn't execute if fzf is an alias and the command doesn't actually exist

[3ximus]

This is a very simple fix for the case where you have an alias for fzf but the fzf command doesn't actually exist

[akinomyoga]

The change suggested by this PR seems to disable the script under the presence of alias fzf regardless of whether the command actually exists. In particular, the script is canceled when both the alias fzf and the command fzf exist, but this seems slightly different from the PR title. Is this intentional?

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Note: The following comments are unrelated to the above discussion but just suggest using idioms to check the existence of aliases.

[3ximus]

Indeed @akinomyoga, just came here to correct that because I only noticed it today, I though I had tested correctly but must have made a mistake.

How about something like this? It should not detect aliases

type -P fzf >/dev/null || return

[akinomyoga]

That works and is much clearer! Thank you!

In this case, I think one wants to prefix command to the fzf invocations (e.g. in the following part for Bash) as command fzf so that it doesn't pick the alias if any.

fzf-marks/fzf-marks.plugin.bash

Lines 35 to 43 in 1adfd27

	_fzm_FZF_VERSION=$(fzf --version | awk -F. '{ print $1 * 1e6 + $2 * 1e3 + $3 }')
	_fzm_MINIMUM_VERSION=16001
	if [[ $_fzm_FZF_VERSION -gt $_fzm_MINIMUM_VERSION ]]; then
	FZF_MARKS_COMMAND="fzf --height 40% --reverse"
	elif [[ ${FZF_TMUX:-1} -eq 1 ]]; then
	FZF_MARKS_COMMAND="fzf-tmux -d${FZF_TMUX_HEIGHT:-40%}"
	else
	FZF_MARKS_COMMAND="fzf"

[3ximus]

I've added those in!
Cheers

[urbainvaes]

Thank you very much @3ximus for the pull request, and thank you very much @akinomyoga for handling everything!