Rewrite wcurl to make it less bash-dependent
Signed-off-by: Sergio Durigan Junior <sergiodj@debian.org>
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Sergio Durigan Junior
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179
wcurl
179
wcurl
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@ -1,96 +1,103 @@
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#!/bin/bash
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# wcurl - a simple wrapper around curl for easily downloading files.
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# version: 2024-06-26
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#
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# Copyright (C) Samuel Henrique, <samueloph@debian.org>.
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice (including the next
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# paragraph) shall be included in all copies or substantial portions of the
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# Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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#
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# SPDX-License-Identifier: MIT
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# wcurl - a simple wrapper around curl to easily download files.
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function print_help {
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printf "Usage: wcurl [-o|--opts=<CURL_OPTIONS>...] <URL>...\n"
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printf "For all options use the manual: man wcurl\n"
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set -e
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usage() {
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cat << _EOF_
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$0 -- a simple wrapper around curl to easily download files.
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Usage: $0 [-o <CURL_OPTIONS>|--opts=<CURL_OPTIONS>] <URL>...
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Options:
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-o,--opts <CURL_OPTIONS>: Specify extra options to be
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passed when invoking curl.
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<URL>: The URL to be downloaded. May be specified more than once.
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_EOF_
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}
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# Initialize array which stores list of encoded URLs.
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declare -a urls_to_download=()
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# If no arguments were provided, show the help output and exit with an error.
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if [ $# -eq 0 ]; then
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>&2 echo "No arguments provided, here's the help output:"
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print_help
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error() {
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printf "%s\n" "$*" > /dev/stderr
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exit 1
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fi
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}
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# Parse arguments and encode URLs to be downloaded.
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for argument in "$@"
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do
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# Check if argument is a parameter, we need to pass those to curl.
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if [[ $argument == -o=* ]] || [[ $argument == --opts=* ]]; then
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curl_opts="${argument#*=}"
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# Show help output on -h|--help
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elif [[ $argument == "-h" ]] || [[ $argument == "--help" ]]; then
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print_help
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exit 0
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# Unknown parameter provided.
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elif [[ $argument == -* ]]; then
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echo "Unsuported parameter provided, only -o= and --opts= are supported: $argument"
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exit 1
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# If it's not a parameter, assume it's an URL.
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else
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# Encode whitespaces into %20, since wget supports those URLs.
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urls_to_download+=("${argument/ /%20/}")
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OPTS=$(getopt --options "o:h" --longoptions "opts:,help" --name wcurl -- "$@")
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eval set -- "${OPTS}"
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# Extra curl options.
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# FIXME: Should this really be per-URL?
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CURL_OPTIONS=""
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# The URLs to be downloaded.
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URLS=""
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# Set this to "--parallel" if there's more than one URL to download.
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CURL_PARALLEL=""
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# Parameters to be passed for each URL.
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PER_URL_PARAMETERS="--location --remote-name --remote-time --retry 10 --retry-max-time 10 --continue-at - "
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# Sanitize parameters.
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sanitize()
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{
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if [ -z "${URLS}" ]; then
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error "You must provide at least one URL to download."
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fi
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if [ -n "${CURL_OPTIONS}" ]; then
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PER_URL_PARAMETERS="${PER_URL_PARAMETERS} ${CURL_OPTIONS} "
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fi
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readonly CURL_OPTIONS URLS PER_URL_PARAMETERS CURL_PARALLEL
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}
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# Execute curl with the list of URLs provided by the user.
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exec_curl()
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{
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set -- $URLS
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# We can't use --next for the first URL.
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CMD="curl ${CURL_PARALLEL} ${PER_URL_PARAMETERS} ${1} "
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shift
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for url in "$@"; do
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CMD="${CMD} --next ${PER_URL_PARAMETERS} ${url}"
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done
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echo exec $CMD
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}
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while [ -n "${1}" ]; do
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case "${1}" in
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"-o"|"--opts")
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shift
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CURL_OPTIONS="${CURL_OPTIONS} ${1}"
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;;
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"-h"|"--help")
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usage
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exit 0
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;;
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"--")
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# This is the start of the list of URLs.
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shift
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if [ "$#" -gt 1 ]; then
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CURL_PARALLEL="--parallel"
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fi
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for url in "$@"; do
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newurl=$(printf "%s\n" "${url}" | sed 's/ /%20/g')
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URLS="${URLS} ${newurl}"
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done
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break
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;;
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esac
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shift
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done
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# The init read-only variable is used below in the for loop to check if the url
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# being appended to the command is the first one or not. That's because once we
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# are appending any URLs after the first one, we need to also make use of the
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# "--next" parameter.
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# Only set '--parallel' if there's more than one URL. This increases the
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# compatibility with other parameters that can be passed through -o/--opts
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# since some might not work together with --parallel.
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if (( ${#urls_to_download[@]} > 1 )); then
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declare -r command_to_exec_init="curl --parallel"
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else
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declare -r command_to_exec_init="curl"
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fi
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command_to_exec="$command_to_exec_init"
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declare -r per_url_parameters="--location --remote-name --remote-time \
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--retry 10 --retry-max-time 10 $curl_opts --continue-at -"
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# If we have URLs to download.
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if (( ${#urls_to_download[@]} > 0 )); then
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for url in "${urls_to_download[@]}"; do
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# If this is the first command we've added, don't prepend "--next" to it.
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if [[ "$command_to_exec" == "$command_to_exec_init" ]]; then
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command_to_exec="$command_to_exec $per_url_parameters $url"
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else
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command_to_exec="$command_to_exec --next $per_url_parameters $url"
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fi
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done
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fi
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# Call curl with the generated parameters.
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exec $command_to_exec
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sanitize
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exec_curl
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