#!/usr/bin/env bash

: "${CM_LAUNCHER=dmenu}"
: "${CM_DIR="${XDG_RUNTIME_DIR-"${TMPDIR-/tmp}"}"}"
: "${CM_HISTLENGTH=8}"

major_version=6

shopt -s nullglob

cache_dir=$CM_DIR/clipmenu.$major_version.$USER
cache_file=$cache_dir/line_cache

if [[ $1 == --help ]] || [[ $1 == -h ]]; then
    cat << 'EOF'
clipmenu is a simple clipboard manager using dmenu and xsel. Launch this
when you want to select a clip.

All arguments are passed through to dmenu itself.

Environment variables:

- $CM_DIR: specify the base directory to store the cache dir in (default: $XDG_RUNTIME_DIR, $TMPDIR, or /tmp)
- $CM_HISTLENGTH: specify the number of lines to show in dmenu/rofi (default: 8)
- $CM_LAUNCHER: specify a dmenu-compatible launcher (default: dmenu)
- $CM_OUTPUT_CLIP: if set, output clip selection to stdout
EOF
    exit 0
fi

# rofi supports dmenu-like arguments through the -dmenu flag
[[ "$CM_LAUNCHER" == rofi ]] && set -- -dmenu "$@"

list_clips() {
    LC_ALL=C sort -rnk 1 < "$cache_file" | cut -d' ' -f2- | awk '!seen[$0]++'
}

if [[ "$CM_LAUNCHER" == rofi-script ]]; then
    if (( $# )); then
        chosen_line="${!#}"
    else
        list_clips
        exit
    fi
else
    chosen_line=$(list_clips | "$CM_LAUNCHER" -l "${CM_HISTLENGTH}" "$@")
fi

[[ $chosen_line ]] || exit 1
file=$cache_dir/$(cksum <<< "$chosen_line")
[[ -f "$file" ]] || exit 2

for selection in clipboard primary; do
    xsel --logfile /dev/null -i --"$selection" < "$file"
done

if (( CM_OUTPUT_CLIP )); then
    cat "$file"
fi