155 lines
4.4 KiB
Bash
Executable file
155 lines
4.4 KiB
Bash
Executable file
#!/bin/bash
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: "${CM_ONESHOT=0}"
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: "${CM_OWN_CLIPBOARD=1}"
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: "${CM_DEBUG=0}"
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: "${TMPDIR=/tmp}"
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major_version=3
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cache_dir=$TMPDIR/clipmenu.$major_version.$USER/
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cache_file=$cache_dir/line_cache
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lock_file=$cache_dir/lock
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lock_timeout=2
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_xsel() {
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timeout 1 xsel --logfile /dev/stderr "$@"
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}
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get_first_line() {
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# Args:
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# - $1, the file or data
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# - $2, optional, the line length limit
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data=${1?}
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line_length_limit=${2-300}
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# We look for the first line matching regex /./ here because we want the
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# first line that can provide reasonable context to the user. That is, if
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# you have 5 leading lines of whitespace, displaying " (6 lines)" is much
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# less useful than displaying "foo (6 lines)", where "foo" is the first
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# line in the entry with actionable context.
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awk -v limit="$line_length_limit" '
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BEGIN { printed = 0; }
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printed == 0 && NF {
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$0 = substr($0, 0, limit);
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printf("%s", $0);
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printed = 1;
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}
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END {
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if (NR > 1) {
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print " (" NR " lines)";
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} else {
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printf("\n");
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}
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}' <<< "$data"
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}
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debug() {
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if (( CM_DEBUG )); then
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printf '%s\n' "$@" >&2
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fi
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}
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if [[ $1 == --help ]] || [[ $1 == -h ]]; then
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cat << 'EOF'
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clipmenud is the daemon that collects and caches what's on the clipboard.
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when you want to select a clip.
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Environment variables:
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- $CM_ONESHOT: run once immediately, do not loop (default: 0)
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- $CM_DEBUG: turn on debugging output (default: 0)
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- $CM_OWN_CLIPBOARD: take ownership of the clipboard (default: 1)
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- $TMPDIR: specify the base directory to store the cache dir in (default: /tmp)
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EOF
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exit 0
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fi
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# It's ok that this only applies to the final directory.
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# shellcheck disable=SC2174
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mkdir -p -m0700 "$cache_dir"
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declare -A last_data
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exec {lock_fd}> "$lock_file"
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while (( CM_ONESHOT )) || sleep "${CM_SLEEP:-0.5}"; do
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if ! flock -x -w "$lock_timeout" "$lock_fd"; then
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if (( CM_ONESHOT )); then
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printf 'ERROR: %s\n' 'Timed out waiting for lock' >&2
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exit 1
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else
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printf 'ERROR: %s\n' \
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'Timed out waiting for lock, skipping this run' >&2
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continue
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fi
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fi
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for selection in clipboard primary; do
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data=$(_xsel -o --"$selection"; printf x)
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debug "Data before stripping: $data"
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# We add and remove the x so that trailing newlines are not stripped.
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# Otherwise, they would be stripped by the very nature of how POSIX
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# defines command substitution.
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data=${data%x}
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debug "Data after stripping: $data"
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if [[ $data != *[^[:space:]]* ]]; then
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debug "Skipping as clipboard is only blank"
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continue
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fi
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if [[ ${last_data[$selection]} == "$data" ]]; then
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debug 'Skipping as last selection is the same as this one'
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continue
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fi
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last_data[$selection]=$data
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first_line=$(get_first_line "$data")
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debug "New clipboard entry on $selection selection: \"$first_line\""
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# Without checking ${last_data[any]}, we often double write since both
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# selections get the same content
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if [[ ${last_data[any]} != "$data" ]]; then
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filename="$cache_dir/$(cksum <<< "$first_line")"
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debug "Writing $data to $filename"
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printf '%s' "$data" > "$filename"
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debug "Writing $first_line to $cache_file"
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printf '%s\n' "$first_line" >> "$cache_file"
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fi
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last_data[any]=$data
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if (( CM_OWN_CLIPBOARD )) && [[ $selection != primary ]]; then
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# Take ownership of the clipboard, in case the original application
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# is unable to serve the clipboard request (due to being suspended,
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# etc).
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#
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# Primary is excluded from the change of ownership as applications
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# sometimes act up if clipboard focus is taken away from them --
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# for example, urxvt will unhilight text, which is undesirable.
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#
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# We can't colocate this with the above copying code because
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# https://github.com/cdown/clipmenu/issues/34 requires knowing if
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# we would skip first.
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_xsel -o --"$selection" | _xsel -i --"$selection"
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fi
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done
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flock -u "$lock_fd"
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if (( CM_ONESHOT )); then
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debug 'Oneshot mode enabled, exiting'
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break
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fi
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done
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