#!/usr/bin/env zsh
# Open log files from paste services in a terminal. If the URL doesn't seem to
# be plain text, open in ${default_cmd} instead

setopt LOCAL_OPTIONS ERR_RETURN NO_UNSET PIPE_FAIL

# Remove temporary files on exit
trap "rm -r ${$(mktemp --dry-run --suffix='.end')/.*.end/.*.readwwwlog}" EXIT

zmodload zsh/zutil
local -a o_help=()
zparseopts -D -K -- h=o_help
if [[ ${#o_help} -ne 0 || ! -v 1 ]]; then
    local ret=$(( ${#o_help} ^ 1 ))
    print -u $(( 1 + ${ret} )) "usage: ${0} [-h] <URL> …"
    return ${ret}
fi
local -a urls=(${@})

local default_cmd="firefox"
local termopts=""

for url in ${urls}; do
    [[ ${url[-1]} == "/" ]] && url=${url[1,-2]} # Remove trailing slash (safe?)
    local id=${url##*/} # Most paste services have the ID as the last element

    if [[ ${url} =~ 'dpaste\.com' && ! ${url[-4,-1]} == ".txt" ]]; then
        url+=".txt"
    elif [[ ${url} =~ '(//|\.)(pastebin\.|paste\.centos\.org)' ]] && \
             [[ ! ${url} =~ '/raw/' ]]; then
        local host=${${(@s:/:)url}[2]}
        if [[ ${${(@s:/:)url}[3]} == "view" ]]; then
            url="https://${host}/view/raw/${id}"
        else
            url="https://${host}/raw/${id}"
        fi
    elif [[ ${url} =~ 'irccloud\.com' && ! ${url} =~ '/raw/' ]]; then
        id=${${(@s:/:)url}[4]}
        url="https://www.irccloud.com/pastebin/raw/${id}"
    elif [[ ${url} =~ 'bpa\.st' && ! ${url} =~ '/download-archive/' ]]; then
        url="https://bpa.st/download-archive/${id}"
    elif [[ ${url} =~ 'paste\.debian\.net' && ! ${url} =~ '/plain/' ]]; then
        url="https://paste.debian.net/plain/${id}"
    elif [[ ${url} =~ 'paste\.ee' && ! ${url} =~ '/r/' ]]; then
        # NOTE: will only show 1st paste
        url="https://paste.ee/r/${id}"
    fi

    if [[ ${TERMINAL} =~ "alacritty|xfce4-terminal" ]]; then
        termopts="--title=${url}"
    fi

    local curl="$(curl --silent --location --head ${url})"
    local -a headers=(${(ps:\r\n:)curl})
    local -a cmd=(less +1 --LINE-NUMBERS --ignore-case \
                       --pattern='(error|fail):')
    if [[ -o NO_INTERACTIVE ]]; then
        cmd=(${TERMINAL} ${termopts} -e ${cmd})
    fi

    if [[ ${headers[(I)*text/*]} -ne 0 ]] || \
           [[ ${headers[(I)*HTTP/1.1 405*]} -ne 0 ]]; then # No HEAD allowed
        [[ ${url} =~ 'dpaste\.com' ]] && sleep 1
        local file="$(mktemp --suffix='.readwwwlog')"
        curl --silent --location --output ${file} ${url}
        ${cmd} ${file}
    elif [[ ${headers[(I)*application/zip]} -ne 0 ]]; then
        local dir="$(mktemp --directory --suffix='.readwwwlog')"
        local file=${dir}/archive.zip

        curl --silent --location --output ${file} ${url}
        unzip -qd ${dir} ${file}
        for txt in ${dir}/*; do
            if [[ ${txt} != "${dir}/archive.zip" ]]; then
                ${cmd} ${txt}
            fi
        done
    else
        ${default_cmd} ${url}
    fi
done