pickmany

#!/usr/bin/env bash

# Takes a file with a list of options, and builds a simple "pick-many" dialog
# menu out of them.

if ! which dialog >/dev/null; then
    echo "ERROR: 'dialog' not installed" 1>&2
    exit 1
fi

MARGIN=6
CHROME=7

function min {
    _min=9999999999
    for i in $*; do
        if [ $i -lt $_min ]; then
            _min=$i
        fi
    done
    echo $_min
}

function max {
    _max=-9999999999
    for i in $*; do
        if [ $i -gt $_max ]; then
            _max=$i
        fi
    done
    echo $_max
}

function dialog_dims {
    content_dims=()
    read content_lines content_cols < <(echo "$1" | wc -l -L)
    win_height=$(tput lines)
    win_width=$(tput cols)
    opts_height=$(min $(($content_lines)) $(($win_height - $MARGIN - $CHROME)))
    page_height=$(($opts_height + $CHROME))
    page_width=$(min $(($content_cols + $CHROME)) $(($win_width - $MARGIN)))
    echo $page_height $page_width $opts_height
}

input=$(cat)
if [ -z "$input" ]; then
    exit 1
fi

# Add quotes so that each line remains its own entity
contents="$(echo "$input" | sed 's/\(.*\)/"\1" off/' | nl)"

# Calculate the size of the required dialog box
dims=$(dialog_dims "$contents")

# Cut out tabs and newlines. Like xargs except with less quote fuckery.
ol_contents=$(tr '	\n' '  ' <<< "$contents")

cmd="dialog --checklist \"Pick Many\" $dims "$ol_contents
# echo "$cmd"; exit 1

res=$(eval "$cmd" 3>&2 2>&1 1>&3 </dev/tty)
rc=$?
res=$(echo "$res" | tr -d '"' | tr ' ' '|')
if [ $rc -ne 0 ]; then
    exit 1
fi

echo "$contents" | egrep "^ *($res)\>" | awk -F'"' '{print $2}'