File: cio.sh
   1 #!/bin/sh
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright © 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 # cio [options...] [filepath...]
  27 #
  28 #
  29 # Clipboard IO automatically figures out whether to copy/paste from/to the
  30 # clipboard, depending on the piping of its standard input/output.
  31 #
  32 # When both its standard input/output are piped, it first updates the text
  33 # clipboard, and then emits its new value to the standard output.
  34 #
  35 # When run unpiped on its own, it just emits the current clipboard value to
  36 # the standard output.
  37 #
  38 # The options are, available both in single and double-dash versions
  39 #
  40 #   -c        clear/empty the clipboard
  41 #   -clear    clear/empty the clipboard
  42 #   -e        clear/empty the clipboard
  43 #   -empty    clear/empty the clipboard
  44 #
  45 #   -h        show this help message
  46 #   -help     show this help message
  47 
  48 
  49 case "$1" in
  50     -h|--h|-help|--help)
  51         awk '/^# +cio /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  52         exit 0
  53     ;;
  54 esac
  55 
  56 if [ -e /dev/clipboard ]; then
  57     get_clip='cat /dev/clipboard'
  58     set_clip='cat > /dev/clipboard'
  59 elif [ -e /usr/bin/wl-paste ]; then
  60     get_clip='wl-paste --no-newline'
  61 elif [ -e /usr/bin/wclip ]; then
  62     get_clip='wclip -o'
  63     set_clip='wclip'
  64 elif [ -e /usr/bin/xclip ]; then
  65     get_clip='xclip -o'
  66     set_clip='xclip -sel clip'
  67 elif [ -e /usr/bin/pbpaste ]; then
  68     get_clip='pbpaste'
  69 fi
  70 
  71 if [ -z "${set_clip}" ]; then
  72     if [ -e /usr/bin/wl-copy ]; then
  73         set_clip='wl-copy'
  74     elif [ -e /usr/bin/pbcopy ]; then
  75         set_clip='pbcopy'
  76     fi
  77 fi
  78 
  79 case "$1" in
  80     -c|--c|-clear|--clear|-e|--e|-empty|--empty)
  81         ${set_clip} < /dev/null
  82         return $?
  83     ;;
  84 esac
  85 
  86 [ "$1" = "--" ] && shift
  87 
  88 emit_clipboard() {
  89     if [ -z "${get_clip}" ]; then
  90         printf "can't read the clipboard\n" > /dev/stderr
  91         exit 1
  92     fi
  93     ${get_clip} || exit $?
  94 }
  95 
  96 change_clipboard() {
  97     if [ -z "${set_clip}" ]; then
  98         printf "can't change the clipboard\n" > /dev/stderr
  99         exit 1
 100     fi
 101     cat "$@" | ${set_clip} || exit $?
 102 }
 103 
 104 if [ $# -gt 0 ]; then
 105     # handle `cio ...` or `cio ... | ...`
 106     change_clipboard "$@"
 107     if [ -p /dev/stdout ]; then
 108         emit_clipboard
 109     fi
 110     exit 0
 111 elif [ -p /dev/stdin ]; then
 112     # handle `... | cio` or `... | cio | ...`
 113     change_clipboard /dev/stdin
 114     if [ -p /dev/stdout ]; then
 115         emit_clipboard
 116     fi
 117     exit 0
 118 else
 119     # handle `cio` or `cio | ...`
 120     emit_clipboard
 121     exit 0
 122 fi