tcgdb

#!/bin/sh
# (c) Copyright 2017 Jonathan Simmonds
# Basic wrapper on top of cgdb to separate program output into a tmux panel.
set -e

usage()
{
    echo "usage: tcgdb [-h] program [gdb-arg [gdb-arg [...]]]"
    echo ""
    echo "Basic wrapper on top of cgdb to separate program output into a tmux"
    echo "panel. The Rolls Royce of terminal debuggers."
    echo ""
    echo "positional arguments:"
    echo "  program     Path to the application to debug."
    echo "  gdb-args    All additional arguments will be passed as gdb options to"
    echo "              cgdb (which will pass them straight through to gdb). If"
    echo "              tcgdb immediately exits these commands are likely invalid."
    echo ""
    echo "optional arguments:"
    echo "  -h, --help  Print this message and exit."
    exit 1
}

# Script variables
SESSIONNAME="tcgdb-session"
DEBUGGER="cgdb"
DBG_TARGET=""
GDB_ARGS=""
FULL_CMDLINE="$0 $@"

# Handle command line
while [ $# -gt 0 ]; do
    command_line_arg="$1"
    shift
    case $command_line_arg in
        -h)
            usage
            ;;
        --help)
            usage
            ;;
        *)
            if [ -n "$DBG_TARGET" ]; then
                # If the search term has already been set, aggregate all other
                # options to the gdb command line.
                GDB_ARGS="$GDB_ARGS $command_line_arg"
            else
                DBG_TARGET="$command_line_arg"
            fi
            ;;
    esac
done
if [ -z "$DBG_TARGET" ]; then
    usage
fi

# Check if a tmux session is already running.
set +e
tmux has-session -t "${SESSIONNAME}" > /dev/null 2>&1
if [ $? -ne 0 ]; then
    # If not create a new session and re-run this script within it.
    tmux new-session -s "${SESSIONNAME}" "$FULL_CMDLINE" > /dev/null
else
    # If so, take control of it and execute cgdb in it.
    tmux split-window -h -p 50 "gdbserver :12345 ${DBG_TARGET}"
    tmux select-pane -t 0
    $DEBUGGER -ex "target remote localhost:12345" ${GDB_ARGS}
    tmux kill-session -t "${SESSIONNAME}"
fi