curl2aria2c

#!/usr/bin/env bash
#
# NAME
#
#   curl2aria2c - convert a cURL command into an aria2c command
#
# SYNOPSIS
#
#   curl2aria2c <cURL args>...
#
# DESCRIPTION
#
#   curl2aria2ac converts a cURL command into an equivalent aria2c
#   command and executes it.  The options supported currently are:
#
#       -H <header>
#       --cookie <cookie>
#       --output <file>
#
#   These are the main options that Firefox's "Copy as cURL" feature
#   produces.
#
# DEPENDENCIES
#
#   aria2c(1)
#

args=( "--continue" "--http-accept-gzip" )
while [[ "$1" ]]
do
    case "$1" in
        # Ignore "range" header.  aria2c will want to
        # request custom ranges anyway.
        -H) shift
            [[ $1 =~ ^[rR]ange: ]] || args+=( "--header" "$1" ) ;;
        --output) args+=( "--out" ) ;;
        # These options don't have aria2c equivalents.  They were
        # procured from curl.js available at:
        # https://hg.mozilla.org/mozilla-central/file/tip/devtools/client/shared/curl.js
        --globoff|--data-*|-I|-X)
            [[ "$1" =~ --data ]] && shift
            echo >&2 "${0##*/}: option $1 ignored" ;;
        --cookie)
            shift; args+=( --header="Cookie:$1" ) ;;
        *)  args+=( "$1" ) ;;
    esac
    shift
done

exec aria2c "${args[@]}"