File: fetch.sh
   1 #!/bin/sh
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright © 2020-2025 pacman64
   6 #
   7 # Permission is hereby granted, free of charge, to any person obtaining a copy
   8 # of this software and associated documentation files (the “Software”), to deal
   9 # in the Software without restriction, including without limitation the rights
  10 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 # copies of the Software, and to permit persons to whom the Software is
  12 # furnished to do so, subject to the following conditions:
  13 #
  14 # The above copyright notice and this permission notice shall be included in
  15 # all copies or substantial portions of the Software.
  16 #
  17 # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23 # SOFTWARE.
  24 
  25 
  26 # fetch [options...] [URIs/data-URIs...]
  27 #
  28 # Fetch/web-request all URIs given, using protcol HTTPS when none is given.
  29 # Base64-encoded data-URI are also supported, being simply decoded into the
  30 # bytes they represent, no loading/fetching required.
  31 #
  32 # The only options show this help message, via any of `-h`, `--h`, `-help`,
  33 # or `--help`.
  34 
  35 
  36 # fail quits the script right after showing the message given, using
  37 # exit code given as its 2nd arg
  38 fail() {
  39     printf "\e[31m%s\e[0m\n" "$1" > /dev/stderr
  40     exit "${2:-1}"
  41 }
  42 
  43 
  44 case "$1" in
  45     -h|--h|-help|--help)
  46         awk '/^# +fetch /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  47         exit 0
  48     ;;
  49 esac
  50 
  51 if [ $# -eq 0 ]; then
  52     awk '/^# +fetch /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  53     exit 0
  54 fi
  55 
  56 for uri in "$@"; do
  57     case "${uri}" in
  58         file://*|https://*|http://*|ftp://*|ftps://*|sftp://*|dict://*|telnet://*)
  59             curl --show-error -s "${uri}" ||
  60                 "failed to fetch ${uri}" $?
  61         ;;
  62         data:*)
  63             {
  64                 echo "${uri}" | sed -E 's-^data:.{0,50};base64,--' | base64 -d
  65             } || fail "failed to decode base64-encoded data URI" $?
  66         ;;
  67         *)
  68             curl --show-error -s "https://${uri}" ||
  69                 fail "failed to fetch https://${uri}"
  70         ;;
  71     esac
  72 done