Add support for Alacritty preview in ANSI Format

[jeeftor]

Change

Modification to fzf-preview.sh to support Alacritty which doesn't have sixel support

• Alacritty black bg
• Wezterm Blue bg

Alacritty doesn't support SIXELS but chafa can still work

[junegunn]

The man page of chafa states that it auto-detects the right format.

OUTPUT ENCODING
       -f, --format format
           Set output format; one of [iterm, kitty, sixels, symbols]. The
           default is iterm, kitty or sixels if the connected terminal
           supports one of these, falling back to symbols ("ANSI art")
           otherwise.

Which means we can just drop -f sixel instead?

Suggested change

	# Alacritty doesn't support sixels
	if [[ $ALACRITTY_WINDOW_ID ]]; then
	chafa --colors 256 -s "$dim" "$file"
	else
	chafa -f sixel -s "$dim" "$file"
	fi
	chafa -s "$dim" "$file"

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Hmm, no, chafa fails to detect it's on iTerm2 and doesn't render image nicely on it. The issue is fixed on master, but no releases yet.

hpjansson/chafa#196

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I don't use alacritty, but I believe it's capable of showing more than 256 colors. So why don't we just drop --colors 256?

If left unspecified, an optimal default will be chosen based on the current environment.

[jeeftor]

I'll give this a test ... on vacation for a week but have some time today to verify

[jeeftor]

Wez / Alacritty

I can confirm this ... on iterm2 it shows up as ansi/

Iterm2

[junegunn]

Now that we have the new chafa version with the fix, I think we can just drop -f sixel as suggested above.