pwb_template

#!/usr/bin/env bash

enable ate
enable pwb
source <( pwb_sources \
              ate_exit_on_error \
              pwb_exit_on_error \
              pwb_newline_head  \
        )

declare MARGIN_COLOR=$'\e[48;2;64;64;64m'

##########################
### TABLE MAINTNENANCE ###
##########################

load_table()
{
   local table_name="$1"

   # Confirm table configuration
   local -i expected_row_size=1
   ate get_row_size "$table_name"
   if (( ATE_VALUE != expected_row_size )); then
       printf "Misconfigured table has %d instead of %d fields.\n" \
              "$ATE_VALUE" "$expected_row_size"
       exit 1
   fi

   # Get access to ate-hosted array
   ate get_array_name "$table_name"
   ate_exit_on_error
   local -n lt_array="$ATE_VALUE"

   lt_array=( * )
   ate index_rows "$table_name"
}

#############################
### PWB EXECUTION SECTION ###
#############################

# Recognize extra keys, prototype an exec function

# Keypresses should be linked to '7', which will result in
# these keys triggering the common exec function
declare -a extra_keys=(
    $'\e'    7     # Escape key declaration
    E        7     # upper- and
    e        7     # lower-case for same letter must be
                   # declared individually
)

pwb declare_keymap ek_map extra_keys
pwb_exit_on_error

common_exec()
{
    local keyp="$1"
    local -i index="$2"
    local table_name="$3"
    local pwb_name="$4"

    # ensure same set of keys are in the key_map and the 'case'
    case "$keyp" in
        $'\cm' ) echo "Pressed ENTER!" ;;
        $'\e'  ) echo "Pressed ESCAPE!" ;;
        E|e    ) echo "Pressed 'e'" ;;
    esac

    return 0
}

############################
### PWB PRINTING SECTION ###
############################

print_line()
{
    local -i index="$1"
    local table_name="$2"
    local -i char_limit="$3"

    declare -a row
    ate get_row "$table_name" "$index" -a row
    ate_exit_on_error

    declare trow
    printf -v trow "%-*s" "$char_limit" "${row[0]}"
    printf "%s" "${trow:0:$char_limit}"
}

###########################
### PWB SIGNAL HANDLING ###
###########################

# PWB messes with the terminal, and politeness dictates returning
# the terminal to the original state before exiting. Responding to
# signals is the only reliable way to restore the terminal.

trap_for_pwb_cleanup()
{
    pwb restore
    echo "Signal trapped $# arguments, '$*'"
}

#############################
### EXECUTION BEGINS HERE ###
#############################

declare ls_table
ate declare ls_table 1
ate_exit_on_error

if ! load_table ls_table; then
    echo "load_table failed!"
    exit 1
fi

ate get_row_count ls_table
ate_exit_on_error

declare ls_display
pwb declare ls_display ls_table "$ATE_VALUE" print_line \
    -e common_exec
pwb_exit_on_error

# Set traps to ensure cleanup
trap "trap_for_pwb_cleanup EXIT"  EXIT
trap "trap_for_pwb_cleanup SIGINT"  SIGINT
trap "trap_for_pwb_cleanup SIGQUIT"  SIGQUIT
trap "trap_for_pwb_cleanup SIGABRT"  SIGABRT

pwb init
pwb start ls_display -a ek_map