1 files changed, 147 insertions, 0 deletions
diff --git a/.local/bin/fzfimg b/.local/bin/fzfimg
new file mode 100755
index 0000000..b33ffb0
--- /dev/null
+++ b/.local/bin/fzfimg
@@ -0,0 +1,147 @@
+#!/usr/bin/env bash
+# This is just an example how ueberzug can be used with fzf.
+# Copyright (C) 2019  Nico Bäurer
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+readonly BASH_BINARY="$(which bash)"
+readonly REDRAW_COMMAND="toggle-preview+toggle-preview"
+readonly REDRAW_KEY="µ"
+declare -r -x DEFAULT_PREVIEW_POSITION="right"
+declare -r -x UEBERZUG_FIFO="$(mktemp --dry-run --suffix "fzf-$$-ueberzug")"
+declare -r -x PREVIEW_ID="preview"
+
+
+function is_option_key [[ "${@}" =~ ^(\-.*|\+.*) ]]
+function is_key_value [[ "${@}" == *=* ]]
+
+
+function map_options {
+    local -n options="${1}"
+    local -n options_map="${2}"
+
+    for ((i=0; i < ${#options[@]}; i++)); do
+        local key="${options[$i]}" next_key="${options[$((i + 1))]:---}"
+        local value=true
+        is_option_key "${key}" || \
+            continue
+        if is_key_value "${key}"; then
+            <<<"${key}" \
+                IFS='=' read key value
+        elif ! is_option_key "${next_key}"; then
+            value="${next_key}"
+        fi
+        options_map["${key}"]="${value}"
+    done
+}
+
+
+function parse_options {
+    declare -g -a script_options=("${@}")
+    declare -g -A mapped_options
+    map_options script_options mapped_options
+    declare -g -r -x PREVIEW_POSITION="${mapped_options[--preview-window]%%:[^:]*}"
+}
+
+
+function start_ueberzug {
+    mkfifo "${UEBERZUG_FIFO}"
+    <"${UEBERZUG_FIFO}" \
+        ueberzug layer --parser bash --silent &
+    # prevent EOF
+    3>"${UEBERZUG_FIFO}" \
+        exec
+}
+
+
+function finalise {
+    3>&- \
+        exec
+    &>/dev/null \
+        rm "${UEBERZUG_FIFO}"
+    &>/dev/null \
+        kill $(jobs -p)
+}
+
+
+function calculate_position {
+    # TODO costs: creating processes > reading files
+    #      so.. maybe we should store the terminal size in a temporary file
+    #      on receiving SIGWINCH
+    #      (in this case we will also need to use perl or something else
+    #      as bash won't execute traps if a command is running)
+    < <(</dev/tty stty size) \
+        read TERMINAL_LINES TERMINAL_COLUMNS
+
+    case "${PREVIEW_POSITION:-${DEFAULT_PREVIEW_POSITION}}" in
+        left|up|top)
+            X=1
+            Y=1
+            ;;
+        right)
+            X=$((TERMINAL_COLUMNS - COLUMNS - 2))
+            Y=1
+            ;;
+        down|bottom)
+            X=1
+            Y=$((TERMINAL_LINES - LINES - 1))
+            ;;
+    esac
+}
+
+
+function draw_preview {
+    calculate_position
+
+    >"${UEBERZUG_FIFO}" declare -A -p cmd=( \
+        [action]=add [identifier]="${PREVIEW_ID}" \
+        [x]="${X}" [y]="${Y}" \
+        [width]="${COLUMNS}" [height]="${LINES}" \
+        [scaler]=forced_cover [scaling_position_x]=0.5 [scaling_position_y]=0.5 \
+        [path]="${@}")
+        # add [synchronously_draw]=True if you want to see each change
+}
+
+
+function print_on_winch {
+    # print "$@" to stdin on receiving SIGWINCH
+    # use exec as we will only kill direct childs on exiting,
+    # also the additional bash process isn't needed
+    </dev/tty \
+        exec perl -e '
+            require "sys/ioctl.ph";
+            while (1) {
+                local $SIG{WINCH} = sub {
+                    ioctl(STDIN, &TIOCSTI, $_) for split "", join " ", @ARGV;
+                };
+                sleep;
+            }' \
+            "${@}" &
+}
+
+
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+    trap finalise EXIT
+    parse_options "${@}"
+    # print the redraw key twice as there's a run condition we can't circumvent
+    # (we can't know the time fzf finished redrawing it's layout)
+    print_on_winch "${REDRAW_KEY}${REDRAW_KEY}"
+    start_ueberzug
+
+    export -f draw_preview calculate_position
+    SHELL="${BASH_BINARY}" \
+        fzf --preview "draw_preview {}" \
+            --preview-window "${DEFAULT_PREVIEW_POSITION}" \
+            --bind "${REDRAW_KEY}:${REDRAW_COMMAND}" \
+            "${@}"
+fi