--preview: nerd font glyph support from external previewers: eza --icons

[freeo]

Problem
I'm using tv as fuzzy folder finder within ranger-cli. This works surprisingly well with the current features. But since running tv dirs --preview "..." requires a pipe from stdin, the nerd-font icons from eza aren't displayed correctly. I don't know which component exactly introduces this. eza displays nerd-fonts icons correctly, but when piping this to tv with this command, then I get this char in every instance instead of the icon: ␀

fd --type d | tv dirs --preview "eza -a --icons=always --color=always --color-scale --oneline {}"
# same goes for this minimal command
fd --type d | tv dirs --preview "eza --icons=always {}"

Maybe it's because of the pipe?

tv nerd fonts are active btw and work fine when running tv without piping from stdin.
use_nerd_font_icons = true

television 0.9.2
build: 1.83.0 (2025-01-10)

Tested in kitty and ghostty, both with the same result.

Feature

• Support for --preview without piping from STDIN
• Support for nerd font glyphs from preview applications lika eza.

Examples

tv dirs --preview "eza -a --icons=always --color=always --color-scale=all --color-scale-mode=gradient --oneline {}"

Additional context

SIDE NOTE: This is where I use this function:
ranger-cli commands.py

class tv_dirs_select(Command):
    def execute(self):
        import subprocess
        from ranger.ext.get_executables import get_executables

        if "tv" not in get_executables():
            self.fm.notify("Could not find tv(television)", bad=True)
            return

        tv = self.fm.execute_command(
            'fd --type d | tv dirs --preview "eza -a --icons=always --color=always --color-scale --oneline {}"',
            universal_newlines=True,
            stdout=subprocess.PIPE,
        )
        stdout, _ = tv.communicate()
        if tv.returncode == 0:
            selected = os.path.abspath(stdout.strip())
            if os.path.isdir(selected):
                self.fm.cd(selected)
            else:
                self.fm.select_file(selected)

BTW, thank you for television!