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147 lines
4.3 KiB
Bash
147 lines
4.3 KiB
Bash
#!/usr/bin/env bash
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# This is just an example how ueberzug can be used with fzf.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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readonly BASH_BINARY="$(which bash)"
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readonly REDRAW_COMMAND="toggle-preview+toggle-preview"
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readonly REDRAW_KEY="µ"
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declare -r -x DEFAULT_PREVIEW_POSITION="right"
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declare -r -x UEBERZUG_FIFO="$(mktemp --dry-run --suffix "fzf-$$-ueberzug")"
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declare -r -x PREVIEW_ID="preview"
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function is_option_key [[ "${@}" =~ ^(\-.*|\+.*) ]]
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function is_key_value [[ "${@}" == *=* ]]
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function map_options {
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local -n options="${1}"
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local -n options_map="${2}"
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for ((i=0; i < ${#options[@]}; i++)); do
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local key="${options[$i]}" next_key="${options[$((i + 1))]:---}"
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local value=true
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is_option_key "${key}" || \
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continue
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if is_key_value "${key}"; then
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<<<"${key}" \
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IFS='=' read key value
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elif ! is_option_key "${next_key}"; then
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value="${next_key}"
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fi
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options_map["${key}"]="${value}"
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done
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}
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function parse_options {
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declare -g -a script_options=("${@}")
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declare -g -A mapped_options
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map_options script_options mapped_options
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declare -g -r -x PREVIEW_POSITION="${mapped_options[--preview-window]%%:[^:]*}"
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}
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function start_ueberzug {
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mkfifo "${UEBERZUG_FIFO}"
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<"${UEBERZUG_FIFO}" \
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ueberzug layer --parser bash --silent &
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# prevent EOF
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3>"${UEBERZUG_FIFO}" \
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exec
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}
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function finalise {
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3>&- \
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exec
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&>/dev/null \
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rm "${UEBERZUG_FIFO}"
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&>/dev/null \
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kill $(jobs -p)
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}
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function calculate_position {
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# TODO costs: creating processes > reading files
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# so.. maybe we should store the terminal size in a temporary file
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# on receiving SIGWINCH
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# (in this case we will also need to use perl or something else
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# as bash won't execute traps if a command is running)
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< <(</dev/tty stty size) \
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read TERMINAL_LINES TERMINAL_COLUMNS
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case "${PREVIEW_POSITION:-${DEFAULT_PREVIEW_POSITION}}" in
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left|up|top)
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X=1
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Y=1
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;;
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right)
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X=$((TERMINAL_COLUMNS - COLUMNS - 2))
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Y=1
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;;
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down|bottom)
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X=1
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Y=$((TERMINAL_LINES - LINES - 1))
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;;
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esac
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}
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function draw_preview {
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calculate_position
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>"${UEBERZUG_FIFO}" declare -A -p cmd=( \
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[action]=add [identifier]="${PREVIEW_ID}" \
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[x]="${X}" [y]="${Y}" \
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[width]="${COLUMNS}" [height]="${LINES}" \
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[scaler]=forced_cover [scaling_position_x]=0.5 [scaling_position_y]=0.5 \
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[path]="${@}")
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# add [synchronously_draw]=True if you want to see each change
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}
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function print_on_winch {
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# print "$@" to stdin on receiving SIGWINCH
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# use exec as we will only kill direct childs on exiting,
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# also the additional bash process isn't needed
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</dev/tty \
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exec perl -e '
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require "sys/ioctl.ph";
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while (1) {
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local $SIG{WINCH} = sub {
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ioctl(STDIN, &TIOCSTI, $_) for split "", join " ", @ARGV;
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};
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sleep;
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}' \
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"${@}" &
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}
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if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
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trap finalise EXIT
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parse_options "${@}"
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# print the redraw key twice as there's a run condition we can't circumvent
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# (we can't know the time fzf finished redrawing it's layout)
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print_on_winch "${REDRAW_KEY}${REDRAW_KEY}"
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start_ueberzug
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export -f draw_preview calculate_position
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SHELL="${BASH_BINARY}" \
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fzf --preview "draw_preview {}" \
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--preview-window "${DEFAULT_PREVIEW_POSITION}" \
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--bind "${REDRAW_KEY}:${REDRAW_COMMAND}" \
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"${@}"
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fi
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