Apply preview fzf-preview only to files complete tag

[alberti42]

First of all, thank you very much for the amazing plugin.

I am wondering if there is a simple way to show fzf-preview only when completing a selection of files or directories. Normally, if you use the standard zsh completion plugin, the following syntax applies:

zstyle ':completion:<function>:<completer>:<command>:<argument>:<tag>' <style> <value>

where <tag>defines what kind of items the completion applies to, such as files, options, commands, indexes, etc.

I would like to display fzf-preview only for files. Currently, fzf-preview is also fired when for example listing the options of ls command if I do ls -<TAB>, but of course, this is not ideal because there is nothing to preview for options.

I also post here my current configuration so that you get a better idea:

  zstyle ":fzf-tab:complete:*:*" fzf-preview '
    if [[ -d "$realpath" ]]; then
      tree -C -L 3 "$realpath"
    elif [[ -f "$realpath" ]]; then
      if $(grep -qI . "$realpath"); then
        bat -p --color=always "$realpath"
      else
        echo "Realpath: $realpath"
        # Use gstat for Linux; fallback to stat for macOS or BSD
        local stat_cmd
        local -a stat_opts
        local arch=$(uname -s)
        if [[ $OSTYPE = darwin* ]]; then
          # Darwin / FreeBSD version
          local gprefix
          command -v gstat &>/dev/null && gprefix=g
          echo "Yes"
          if [[ -z $gprefix ]]; then
              stat_cmd="stat"
              stat_opts=(
              "-f"
              "File: %N\nLocation: %d:%i\nMode: %Sp (%Mp%Lp)\nLinks: %l\nOwner: %Su/%Sg\nSize: %z (%b blocks)\nChanged: %Sc\nModified: %Sm\nAccessed: %Sa"
              )
          fi
        else
          # Linux or Darwin with GNU support
          stat_cmd="${gprefix}stat"
          stat_opts=(
            "-c"
            "File: %N\nType: %F\nLocation: %d:%i\nMode: %A (%a)\nLinks: %h\nOwner: %U/%G\nSize: %s (%b blocks)\nChanged: %z\nModified: %y\nAccessed: %x"
          )
        fi

        echo $($stat_cmd "$stat_opts[@]" "$realpath")
      fi
    fi'

[alberti42]

Just a follow up on my question, this was already discussed in #256.

My current solution:

# no prview for options
  zstyle ':fzf-tab:complete:*:options' fzf-preview ''
  # preview for files
  zstyle ":fzf-tab:complete:*:argument-rest" fzf-preview '
    if [[ -d "$realpath" ]]; then
      tree -C -L 3 "$realpath"
    elif [[ -f "$realpath" ]]; then
      if $(grep -qI . "$realpath"); then
        bat -p --color=always "$realpath"
      else
        echo "Realpath: $realpath"
        # Use gstat for Linux; fallback to stat for macOS or BSD
        local stat_cmd
        local -a stat_opts
        local arch=$(uname -s)
        if [[ $OSTYPE = darwin* ]]; then
          # Darwin / FreeBSD version
          local gprefix
          command -v gstat &>/dev/null && gprefix=g
          echo "Yes"
          if [[ -z $gprefix ]]; then
              stat_cmd="stat"
              stat_opts=(
              "-f"
              "File: %N\nLocation: %d:%i\nMode: %Sp (%Mp%Lp)\nLinks: %l\nOwner: %Su/%Sg\nSize: %z (%b blocks)\nChanged: %Sc\nModified: %Sm\nAccessed: %Sa"
              )
          fi
        else
          # Linux or Darwin with GNU support
          stat_cmd="${gprefix}stat"
          stat_opts=(
            "-c"
            "File: %N\nType: %F\nLocation: %d:%i\nMode: %A (%a)\nLinks: %h\nOwner: %U/%G\nSize: %s (%b blocks)\nChanged: %z\nModified: %y\nAccessed: %x"
          )
        fi

        echo $($stat_cmd "$stat_opts[@]" "$realpath")
      fi
    fi'

The best would be if fzf does not display the preview panel when an empty string is returned. Then one would have full control about when and what to show in the preview panel.