dotfiles/common/.config/lf/preview

#!/bin/sh

set -C -f

f="$(realpath "$1")" w=$2 h=$3 # x=$4 y=$5

RED="\033[31m"
RESET="\033[0m"
RS="$(printf "\037")"
CACHE="${XDG_CACHE_HOME}/lf/$(stat --printf "%n\0%i\0%F\0%s\0%W\0%Y" -- "$(readlink -f "$1")" | sha256sum | awk '{print $1}')"
BAT="bat --style=plain --color=always --italic-text=always --pager=never --tabs=4 --theme=base16 --line-range=:$h --terminal-width=$((w - 2))"
CHAFA="chafa -f sixel -s ${w}x${h} --polite on --animate false"

run() {
    #shellcheck disable=SC2068
    if ! command -v "$1" >/dev/null 2>&1; then
        printf "%b" "${RED}Cannot execute ${1}${RESET}"
    elif "$@"; then
        :
    else
        printf "%b" "${RED}Failed to run command: ${RESET}"
        for l in "$@"; do
            printf "%b" "\n${RED}  ${l}${RESET}"
        done
    fi
}

cached_text() {
    if [ -f "$CACHE" ]; then
        # shellcheck disable=SC2086
        $BAT "$CACHE"
    else
        # shellcheck disable=SC2086
        run "$@" | tee -p "$CACHE" | $BAT
    fi
}

cached_image() {
    if [ -f "$CACHE" ]; then
        $CHAFA "$CACHE" && exit 1
    else
        run "$@" | tee -p "$CACHE" | $CHAFA && exit 1
    fi
}

mimetest() {
    case "$1" in
        # */pgp-encrypted) run gpg -d -- "$f" ;;
        */vnd.openxmlformats-officedocument.spreadsheetml.sheet | */vnd.oasis.opendocument.spreadsheet)
            if [ -f "$CACHE" ]; then
                $BAT "$CACHE"
            else
                ssconvert --export-type=Gnumeric_stf:stf_assistant -O separator="$RS" "$f" "fd://1" |
                    column -t -s "$RS" | tee -p "$CACHE"
            fi
            ;;
        */vnd.sqlite3)
            if [ -f "$CACHE" ]; then
                $BAT "$CACHE"
            else
                printf ".headers on\n.mode list\nSELECT name FROM sqlite_master WHERE type='table';\n" |
                    sqlite3 "$f" |
                    grep -v name |
                    while read -r table; do
                        [ "$table" != "name" ] &&
                            printf "SELECT * FROM %s;" "$table" |
                            sqlite3 -header -separator "$RS" taskchampion.sqlite3
                    done |
                    column -t -s "$RS" | tee -p "$CACHE"
            fi
            ;;
        */x-7z-compressed | */vnd.rar | */x-tar | */zip | */x-java-archive | */x-xz | */gzip)
            if [ -f "$CACHE" ]; then
                $BAT "$CACHE"
            else
                run 7z l "$f" | sed 1,11d | tee -p "$CACHE" | $BAT
            fi
            ;;
        */epub+zip) cached_image gnome-epub-thumbnailer -s 1024 "$f" "$CACHE" ;;
        image/svg+xml) cached_image inkscape --convert-dpi-method=none -o "${CACHE}.png" --export-overwrite -D --export-png-color-mode=RGBA_16 "$f" ;;
        image/*) $CHAFA "$f" && exit 1 ;;
        */pdf) cached_image pdftoppm -jpeg -f 1 -singlefile "$f" ;;
        video/*) cached_image ffmpegthumbnailer -s 0 -i "$f" -o "/dev/stdout" ;;
        */vnd.oasis.opendocument.text) cached_text odt2txt "$f" ;;
        */vnd.openxmlformats-officedocument.wordprocessingml.document) cached_text docx2txt "$f" - ;;
        */markdown) cached_text mdless "$f" ;;
        */html) cached_text lynx -dump "$f" ;;
        */*json) cached_text jq -C . "$f" ;;
        */msword) cached_text catdoc "$f" ;;
        */x-bittorrent) cached_text transmission-show "$f" ;;
        */x-cd-image) cached_text iso-info --no-header -l "$f" ;;
        */x-bzip-compressed-tar | */x-compressed-tar | */x-xz-compressed-tar) cached_text als -- "$f" ;;
        */*lua) $BAT --language=lua "$f" ;;
        */*yaml) $BAT --language=yaml "$f" ;;
        *text*) $BAT "$f" ;;
        *) return 1 ;;
    esac
}

# Special cases
[ "$(dirname "$(realpath "$f")" | rev | cut -d/ -f1 | rev)" = "factscache" ] &&
    [ -f "$(dirname "$(dirname "$(realpath "$f")")")/ansible.cfg" ] &&
    jq -C <"$f" && exit

giorun="$(gio info "$f" 2>/dev/null | grep standard::content-type | cut -d' ' -f4)"
mimetest "$giorun" && exit

filerun="$(file --brief --dereference --mime-type "$f")"
mimetest "$filerun" && exit

printf "%b" "\$(file --mime-type)\t\t\t : $filerun\n"
[ -n "$giorun" ] && printf "%b" "\$(gio info)\t\t\t\t : $giorun\n"
mediainfo "$1" | head -n -2 | grep -v -e "Complete name" -e "General"