runprog-help.sh

#!/bin/zsh
# Rough parsing script to display help for runprog-mode.

{
    echo "Keybindings for runprog-mode:"
    sed -n '/mode \$runprog {/,/}/p' ~/.config/i3/config | # Extract
        perl -pe 's/\\\n//;s/ +//' | # Parse line continuations; \
            # normalise whitespace
        grep "bindsym" | # Remove anything that isn't a keybinding
        while read bindsym keybind mode_or_exec executable; do
            # Parse loop
            case $mode_or_exec in
                "mode") # Assume no exec block means exit
                    echo "$keybind: exit"
                    ;;
                "exec") # Delete implicit exit block and print
                    echo "$keybind: ${executable/; mode default}"
                    ;;
                *) # Unreachable
                    echo "Parse error: $mode_or_exec is neither mode or exec" >&2
                    exit 1
            esac
        done
} | # Dump everything into a text box and display.
    zenity --title="runprog-mode Help" --width=750 --height 400 \
           --text-info --font="Inziu Iosevka TC" ||
    i3-msg "mode default"