#!/bin/bash

: "${CM_LAUNCHER=dmenu}"
: "${TMPDIR=/tmp}"

major_version=3

shopt -s nullglob

cache_dir=$TMPDIR/clipmenu.$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_LAUNCHER: specify a dmenu-compatible launcher (default: dmenu)
- $TMPDIR: specify the base directory to store the cache dir in (default: /tmp)
EOF
    exit 0
fi

if [[ "$CM_LAUNCHER" == rofi ]]; then
    # rofi supports dmenu-like arguments through the -dmenu flag
    set -- -dmenu "$@"
fi

# It's okay to hardcode `-l 8` here as a sensible default without checking
# whether `-l` is also in "$@", because the way that dmenu works allows a later
# argument to override an earlier one. That is, if the user passes in `-l`, our
# one will be ignored.
chosen_line=$(tac "$cache_file" | awk '!seen[$0]++' | "$CM_LAUNCHER" -l 8 "$@")

[[ $chosen_line ]] || exit 1

file=$cache_dir/$(cksum <<< "$chosen_line")

if ! [[ -f "$file" ]]; then
    # We didn't find this in cache
    printf 'FATAL: %s not in cache\n' "$chosen_line" >&2
    exit 2
fi

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