clipboard-provider

#!/bin/bash
# https://github.com/doodleEsc/nvim/blob/master/clipboard-provider
#
# clipboard provider for neovim
#
# :help provider-clipboard

: ${COPY_PROVIDERS:=osc52 pb xclip tmux local}
: ${PASTE_PROVIDERS:=pb xclip tmux local}
: ${TTY:=`(tty || tmux display-message -p '#{pane_tty}') 2>/dev/null | grep /dev/`}

LOCAL_STORAGE=$HOME/.clipboard-provider.out

main() {
    declare status=1
    case $1 in
        copy)
            slurp
            for p in $COPY_PROVIDERS; do
                $p-provider copy && status=0
            done ;;
        paste)
            for p in $PASTE_PROVIDERS; do
                $p-provider paste && status=0 && break
            done ;;
    esac

    exit $status
}

# N.B. buffer is global for simplicity
slurp() { buffer=$(base64 | tr -d '\n'); }
spit() { base64 --decode <<<"$buffer"; }

is-copy() {
    if [[ "$1" == "copy" ]]; then return 0; else return 1; fi
}

tmux-provider() {
	[[ -n $TMUX ]] || return $(is-copy $1)
    case $1 in
        copy) spit | tmux load-buffer - ;;
        paste) tmux save-buffer - ;;
    esac
}

pb-provider() {
    if ! command -v pbcopy &>/dev/null;then return $(is-copy $1); fi
    case $1 in
        copy) spit | pbcopy ;;
        paste) pbpaste ;;
    esac
}

osc52-provider() {
    case $1 in
        copy) [[ -n "$TTY" ]] && printf $'\e]52;c;%s\a' "$buffer" > "$TTY" ;;
        paste) return 1 ;;
    esac
}

local-provider() {
    case $1 in
        copy) spit > $LOCAL_STORAGE ;;
        paste) cat $LOCAL_STORAGE && return 0;;
    esac
}

xclip-provider() {
    [[ -n $DISPLAY ]] && command -v xclip &>/dev/null || return $(is-copy $1)
    case $1 in
        copy) spit | xclip -i -selection clipboard;;
        paste) xclip -o -selection clipboard;;
    esac
}

main "$@"