bash debugger added

bash-debugger/bdb-test.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -eu
+
+print_arg() {
+    local j=$((i+1))
+    echo "$j: $1"
+    i=$j
+}
+
+i=0
+while (( $# )); do
+    print_arg "$1"
+    shift
+done

bash-debugger/bdb.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+__dbg__breakpoints=()
+__dbg__trace=2
+__dbg__trap() {
+    local __dbg__cmd __dbg__cmd_args __dbg__set="$(set +o)" \
+        __dbg__do_break=false
+    set +eu
+    ((__dbg__trace == 1)) \
+        && echo "+(${BASH_SOURCE[1]}:${BASH_LINENO[0]}): $BASH_COMMAND"
+    for __dbg__breakpoint in "${__dbg__breakpoints[@]}"; do
+        eval "$__dbg__breakpoint" && __dbg__do_break=true && break
+    done
+    ((__dbg__trace == 2)) || $__dbg__do_break && {
+        ((__dbg__trace == 0)) \
+            && echo "+(${BASH_SOURCE[1]}:${BASH_LINENO[0]}): $BASH_COMMAND"
+        ((__dbg__trace == 2)) && __dbg__trace=0
+        while read -p "bdb> "  __dbg__cmd __dbg__cmd_args; do
+            case $__dbg__cmd in
+                '') eval "$__dbg__set" && return 0 ;;
+                trace) ((__dbg__trace ^= 1)) ;;
+                bl) printf "%s\n" "${__dbg__breakpoints[@]}" \
+                    | grep . | cat -n ;;
+                ba) __dbg__breakpoints+=("$__dbg__cmd_args") ;;
+                bd) unset __dbg__breakpoints[$((__dbg__cmd_args - 1))] \
+                    && __dbg__breakpoints=("${__dbg__breakpoints[@]}") ;;
+                *) eval "$__dbg__cmd $__dbg__cmd_args" ;;
+            esac
+        done
+    }
+}
+
+set -T
+trap "__dbg__trap" debug
+
+. "$@"