pv

#!/bin/sh
set -euf
exec 2>/dev/null

draw() {
  jq -nc --argjson x "$x" --argjson y "$y" \
    --argjson width "$width" --argjson height "$height" \
    --arg path "$(readlink -f -- "$1")" '
    {
      "action": "add",
      "identifier": "preview",
      "x": $x,
      "y": $y,
      "width": $width,
      "height": $height,
      "scaler": "contain",
      "scaling_position_x": 0.5,
      "scaling_position_y": 0.5,
      "path": $path
    }' >"$FIFO_UEBERZUG"
  exit 1
}

hash() {
  hash="$(stat --printf '%n\0%i\0%F\0%s\0%W\0%Y' -- "$(readlink -f -- "$1")" | sha256sum | cut -d' ' -f1)"
  dir="$(printf '%s' "$hash" | cut -c1-2)"
  name="$(printf '%s' "$hash" | cut -c3-)"
  cache="$HOME/.cache/lf/$dir/$name"
}

cache() {
  cache="$cache.$1"
  if ! [ -f "$cache" ]; then
    dir="$(dirname -- "$cache")"
    [ -d "$dir" ] || mkdir -p -- "$dir"
    shift
    "$@"
  fi
  draw "$cache"
}

file="$1"
width="$2"
height="$3"
x="$4"
y="$5"

[ -f "$file" ] || [ -h "$file" ]

default_x="1920"
default_y="1080"

mime="$(file -Lb --mime-type -- "$file")"
case "$mime" in
  application/gzip|\
  application/x-bzip2|\
  application/x-xz|\
  application/x-lzma|\
  application/x-lz4|\
  application/zstd|\
  application/x-snappy-framed|\
  application/x-tar|\
  application/x-gtar|\
  application/x-ustar|\
  application/zip|\
  application/x-7z-compressed|\
  application/x-rar)
    exec ouch list -t "$file";;
  application/pdf)
    if [ -n "${FIFO_UEBERZUG-}" ]; then
      hash "$file"
      cache jpg \
        pdftoppm -f 1 -l 1 \
          -scale-to-x "$default_x" \
          -scale-to-y -1 \
          -singlefile \
          -jpeg \
          -- "$file" "$cache"
    else
      exec pdftotext -nopgbrk -q -- "$file" -
    fi
    ;;
  image/vnd.djvu)
    if [ -n "${FIFO_UEBERZUG-}" ]; then
      hash "$file"
      cache tiff \
        ddjvu -format=tiff -quality=90 -page=1 \
          -size="${default_x}x${default_y}" "$file" "$cache.tiff"
    else
      exec djvutxt - <"$file"
    fi
    ;;
  application/vnd.openxmlformats-officedocument.wordprocessingml.document|\
  application/vnd.oasis.opendocument.text|\
  application/epub+zip|\
  text/rtf)
    exec pandoc -s -t plain -- "$file";;
  text/troff)
    COLUMNS="$width" man -- "$file" | col -b; exit;;
  text/html)
    exec lynx -width="$width" -dump -- "$file";;
  application/json)
    exec jq -C <"$file";;
  text/*|application/javascript)
    exec bat --color=always -- "$file";;
  image/svg+xml)
    if [ -n "${FIFO_UEBERZUG-}" ]; then
      hash "$file"
      cache jpg magick -- "$file" "$cache.jpg"
    fi
    ;;
  image/*)
    if [ -n "${FIFO_UEBERZUG-}" ]; then
      # ueberzug doesn't handle image orientation correctly
      orientation="$(magick identify -format '%[orientation]\n' -- "$file[0]")"
      if [ -n "$orientation" ] \
          && [ "$orientation" != Undefined ] \
          && [ "$orientation" != TopLeft ]; then
        hash "$file"
        cache jpg magick -- "$file[0]" -auto-orient "$cache.jpg"
      else
        draw "$file"
      fi
    fi
    ;;
  video/*)
    if [ -n "${FIFO_UEBERZUG-}" ]; then
      hash "$file"
      cache jpg ffmpegthumbnailer -i "$file" -o "$cache.jpg" -s 0
    fi
    ;;
esac

header="File Type Classification"
# lf incorrectly reports the width + 2
: "$((width -= 2))"
padding="$((width - ${#header}))"
len="$((padding / 2 - 2))"
if [ "$len" -gt 0 ]; then
  header=" $header "
  for i in $(seq "$len"); do
    header="─$header─"
  done
  if [ "$((padding % 2))" -eq 1 ]; then
    header="$header─"
  fi
fi
printf '\033[7m %s \033[0m\n' "$header"
file -Lb -- "$file" | fold -s -w "$width"