tmux-picker.sh

#!/usr/bin/env bash

CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

function init_picker_pane() {
    local picker_ids=$(tmux new-window -F "#{pane_id}:#{window_id}" -P -d -n "[picker]" "/bin/sh")
    local picker_pane_id=$(echo "$picker_ids" | cut -f1 -d:)
    local picker_window_id=$(echo "$picker_ids" | cut -f2 -d:)

    if [[ ! -z "$last_pane_id" ]]; then # to save precious milliseconds;)
        local current_size=$(tmux list-panes -F "#{pane_width}:#{pane_height}:#{?pane_active,active,nope}" | grep active)
        local current_width=$(echo "$current_size" | cut -f1 -d:)
        local current_height=$(echo "$current_size" | cut -f2 -d:)

        local current_window_size=$(tmux list-windows -F "#{window_width}:#{window_height}:#{?window_active,active,nope}" | grep active)
        local current_window_width=$(echo "$current_window_size" | cut -f1 -d:)
        local current_window_height=$(echo "$current_window_size" | cut -f2 -d:)

            # this is needed to handle wrapped lines inside split windows:
            tmux split-window -d -t "$picker_pane_id" -h -l "$((current_window_width - current_width - 1))" '/bin/sh'
            tmux split-window -d -t "$picker_pane_id" -l "$((current_window_height - current_height - 1))" '/bin/sh'
        fi

        echo "$picker_pane_id:$picker_window_id"
    }

function capture_pane() {
    local pane_id=$1
    local out_path=$2
    local pane_info=$(tmux list-panes -s -F "#{pane_id}:#{pane_height}:#{scroll_position}:#{?pane_in_mode,1,0}" | grep "^$pane_id")

    local pane_height=$(echo $pane_info | cut -d: -f2)
    local pane_scroll_position=$(echo $pane_info | cut -d: -f3)
    local pane_in_copy_mode=$(echo $pane_info | cut -d: -f4)

    local start_capture=""

    if [[ "$pane_in_copy_mode" == "1" ]]; then
        start_capture=$((-pane_scroll_position))
        end_capture=$((pane_height - pane_scroll_position - 1))
    else
        start_capture=0
        end_capture="-"
    fi

    tmux capture-pane -e -J -p -t $pane_id -E $end_capture -S $start_capture > $out_path
}

function pane_exec() {
    local pane_id=$1
    local pane_command=$2

    tmux send-keys -t $pane_id " $pane_command"
    tmux send-keys -t $pane_id Enter
}

function prompt_picker_for_pane() {
    local current_pane_id=$1
    local last_pane_id=$2
    local picker_init_data=$(init_picker_pane "$last_pane_id")
    local picker_pane_id=$(echo "$picker_init_data" | cut -f1 -d':')
    local picker_window_id=$(echo "$picker_init_data" | cut -f2 -d':')
    local tmp_path=$(mktemp)

    capture_pane "$current_pane_id" "$tmp_path"
    pane_exec "$picker_pane_id" "$CURRENT_DIR/hint_mode.sh \"$current_pane_id\" \"$picker_pane_id\" \"$last_pane_id\" \"$picker_window_id\" $tmp_path"

    echo $picker_pane_id
}

last_pane_id=$(tmux display -pt':.{last}' '#{pane_id}' 2>/dev/null)
current_pane_id=$(tmux list-panes -F "#{pane_id}:#{?pane_active,active,nope}" | grep active | cut -d: -f1)
picker_pane_id=$(prompt_picker_for_pane "$current_pane_id" "$last_pane_id")