File: c.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 # c [options...] [filenames/URIs...] 27 # 28 # Concatenate bytes from all the named sources given, in the order given. 29 # Each named source can be a file, a web (HTTP/HTTPS) resource, or even a 30 # base64-encoded data-URI. Data-URIs are simply decoded into the bytes they 31 # represent, no loading/fetching required. 32 # 33 # The name `-` (a minus, or ASCII dash) means read all bytes from standatd 34 # input. When not given any named source, the standard input is also read 35 # in full, by default. 36 # 37 # The only options show this help message, via any of `-h`, `--h`, `-help`, 38 # or `--help`. 39 40 41 case "$1" in 42 -h|--h|-help|--help) 43 awk '/^# +c /, /^$/ { gsub(/^# ?/, ""); print }' "$0" 44 exit 0 45 ;; 46 esac 47 48 if [ $# -eq 0 ]; then 49 cat 50 exit $? 51 fi 52 53 names=0 54 dashes=0 55 for name in "${@:--}"; do 56 if [ -z "${name}" ]; then 57 continue 58 fi 59 names="$((names + 1))" 60 61 if [ "${name}" = "-" ]; then 62 dashes="$((dashes + 1))" 63 fi 64 65 if [ "${dashes}" -gt 1 ]; then 66 printf "\e[31mcan't use dash/stdin multiple times\e[0m\n" > /dev/stderr 67 exit 1 68 fi 69 done 70 71 for name in "${@:--}"; do 72 if [ -z "${name}" ]; then 73 continue 74 fi 75 76 # if the argument given is an existing file, just use `cat`, even if the 77 # name looks like a protocol presumably meant for `curl` 78 if [ -e "${name}" ]; then 79 cat "${name}" || fail "failed to read file '${name}'" $? 80 continue 81 fi 82 83 case "${name}" in 84 -h|--h|-help|--help) 85 awk '/^# +get /, /^$/ { gsub(/^# ?/, ""); print }' "$0" 86 exit 0 87 ;; 88 89 http://*|https://*|ftp://*) 90 # handle the commonest kinds of URIs 91 # wget -O - "${name}" || fail "failed to fetch URI '${name}'" $? 92 curl -s -L "${name}" || fail "failed to fetch URI '${name}'" $? 93 ;; 94 95 dict://*|ftps://*|gopher://*|gophers://*|rtmp://*|rtsp://*|scp://*|\ 96 sftp://*|smb://*|smbs://*|telnet://*|tftp://*) 97 # handle more kinds of URIs 98 curl -s -L "${name}" || fail "failed to fetch URI '${name}'" $? 99 ;; 100 101 data:*) 102 # handle data-URIs 103 { 104 echo "${name}" | sed -E 's-^data:.{0,50};base64,--' | base64 -d 105 } || fail "failed to decode data-URI '${name}'" $? 106 ;; 107 108 file://*) 109 # handle files 110 cat "$(echo "${name}" | sed 's-^file://--')" 2> /dev/null || 111 fail "failed to open file '${name}'" $? 112 ;; 113 114 -) 115 # handle standard input 116 cat "${name}" 2> /dev/null || 117 fail "failed to read from the standard input" $? 118 ;; 119 120 *) 121 # handle files 122 cat "${name}" 2> /dev/null || 123 fail "failed to open file '${name}'" $? 124 ;; 125 esac 126 done 127 128 if [ "${names}" -eq 0 ]; then 129 cat 130 exit $? 131 fi