How to have multiple fallback commands with piper

[aik2mlj]

What system are you running Yazi on?

Linux Wayland

What terminal are you running Yazi in?

kitty 0.41.1

yazi --debug output

Yazi
    Version: 25.4.8 (Arch Linux 2025-04-09)
    Debug  : false
    Triple : x86_64-unknown-linux-gnu (linux-x86_64)
    Rustc  : 1.86.0 (05f9846f 2025-03-31)

Ya
    Version: 25.4.8 (Arch Linux 2025-04-09)

Emulator
    TERM                : Some("xterm-kitty")
    TERM_PROGRAM        : None
    TERM_PROGRAM_VERSION: None
    Brand.from_env      : Some(Kitty)
    Emulator.detect     : Emulator { kind: Left(Kitty), light: false, cell_size: Some((11, 22)) }

Adapter
    Adapter.matches    : Kgp
    Dimension.available: WindowSize { rows: 62, columns: 232, width: 2552, height: 1364 }

Desktop
    XDG_SESSION_TYPE           : Some("wayland")
    WAYLAND_DISPLAY            : Some("wayland-0")
    DISPLAY                    : Some(":0")
    SWAYSOCK                   : None
    HYPRLAND_INSTANCE_SIGNATURE: None
    WAYFIRE_SOCKET             : None

SSH
    shared.in_ssh_connection: false

WSL
    WSL: false

Variables
    SHELL           : Some("/bin/fish")
    EDITOR          : Some("nvim")
    VISUAL          : Some("nvim")
    YAZI_FILE_ONE   : None
    YAZI_CONFIG_HOME: None
    YAZI_ZOXIDE_OPTS: None
    FZF_DEFAULT_OPTS: None

Text Opener
    default     : Some(OpenerRule { run: "${EDITOR:-vi} \"$@\"", block: true, orphan: false, desc: "$EDITOR", for_: None, spread: true })
    block-create: Some(OpenerRule { run: "${EDITOR:-vi} \"$@\"", block: true, orphan: false, desc: "$EDITOR", for_: None, spread: true })
    block-rename: Some(OpenerRule { run: "${EDITOR:-vi} \"$@\"", block: true, orphan: false, desc: "$EDITOR", for_: None, spread: true })

Multiplexers
    TMUX               : false
    tmux version       : tmux 3.5a
    tmux build flags   : enable-sixel=Unknown
    ZELLIJ_SESSION_NAME: None
    Zellij version     : 0.42.2

Dependencies
    file          : 5.46
    ueberzugpp    : 2.9.6
    ffmpeg/ffprobe: 7.1 / 7.1
    pdftoppm      : 25.04.0
    magick        : 7.1.1-47
    fzf           : 0.61.1
    fd/fdfind     : 10.2.0 / No such file or directory (os error 2)
    rg            : 14.1.1
    chafa         : 1.14.5
    zoxide        : 0.9.7
    7zz/7z        : No such file or directory (os error 2) / 24.09
    jq            : 1.7.1

Clipboard
    wl-copy/paste: 2.2.1 / 2.2.1
    xclip        : 0.13
    xsel         : 1.2.1

Routine
    `file -bL --mime-type`: text/plain


See https://yazi-rs.github.io/docs/plugins/overview#debugging on how to enable logging or debug runtime errors.

Describe the question

Thanks for the piper previewer plugin. I wonder if there's a way to have multiple fallbacks with it. E.g., I want to preview html files with cha, but when it is not installed, preivew with w3m. This does not work:

[plugin]
prepend_previewers = [
    { name = "*.html", run = '(command -v cha >/dev/null 2>&1 && piper -- cha -d "$1") || piper -- w3m -dump "$1"' },
]

Anything else?

No response

Checklist

• I have read all the documentation
• I have searched the existing discussions/issues

[sxyazi]

run is a plugin command, not a shell command.

piper is a plugin that turns shell output into preview content, which accepts a shell command, hence you need:

{ name = "*.html", run = 'piper -- (command -v cha >/dev/null 2>&1 && cha -d "$1") || w3m -dump "$1"' }