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Editing: tracing.bash

#!/usr/bin/bash

# shellcheck source=lib/bats-core/common.bash
source "$BATS_ROOT/lib/bats-core/common.bash"

bats_capture_stack_trace() {
	local test_file
	local funcname
	local i

BATS_DEBUG_LAST_STACK_TRACE=()

for ((i = 2; i != ${#FUNCNAME[@]}; ++i)); do
		# Use BATS_TEST_SOURCE if necessary to work around Bash < 4.4 bug whereby
		# calling an exported function erases the test file's BASH_SOURCE entry.
		test_file="${BASH_SOURCE[$i]:-$BATS_TEST_SOURCE}"
		funcname="${FUNCNAME[$i]}"
		BATS_DEBUG_LAST_STACK_TRACE+=("${BASH_LINENO[$((i-1))]} $funcname $test_file")
		case "$funcname" in
		"${BATS_TEST_NAME-}" | setup | teardown | setup_file | teardown_file | setup_suite | teardown_suite)
			break
			;;
		esac
		if [[ "${BASH_SOURCE[$i + 1]:-}" == *"bats-exec-file" ]] && [[ "$funcname" == 'source' ]]; then
			break
		fi
	done
}

bats_get_failure_stack_trace() {
	local stack_trace_var
	# See bats_debug_trap for details.
	if [[ -n "${BATS_DEBUG_LAST_STACK_TRACE_IS_VALID:-}" ]]; then
		stack_trace_var=BATS_DEBUG_LAST_STACK_TRACE
	else
		stack_trace_var=BATS_DEBUG_LASTLAST_STACK_TRACE
	fi
	# shellcheck disable=SC2016
	eval "$(printf \
		'%s=(${%s[@]+"${%s[@]}"})' \
		"${1}" \
		"${stack_trace_var}" \
		"${stack_trace_var}")"
}

bats_print_stack_trace() {
	local frame
	local index=1
	local count="${#@}"
	local filename
	local lineno

for frame in "$@"; do
		bats_frame_filename "$frame" 'filename'
		bats_trim_filename "$filename" 'filename'
		bats_frame_lineno "$frame" 'lineno'

printf '%s' "${BATS_STACK_TRACE_PREFIX-# }"
		if [[ $index -eq 1 ]]; then
			printf '('
		else
			printf ' '
		fi

local fn
		bats_frame_function "$frame" 'fn'
		if [[ "$fn" != "${BATS_TEST_NAME-}" ]] && 
			# don't print "from function `source'"",
			# when failing in free code during `source $test_file` from bats-exec-file
			! [[ "$fn" == 'source' &&  $index -eq $count ]]; then 
			local quoted_fn
			bats_quote_code quoted_fn "$fn"
			printf "from function %s " "$quoted_fn"
		fi

if [[ $index -eq $count ]]; then
			printf 'in test file %s, line %d)\n' "$filename" "$lineno"
		else
			printf 'in file %s, line %d,\n' "$filename" "$lineno"
		fi

((++index))
	done
}

bats_print_failed_command() {
	local stack_trace=("${@}")
	if [[ ${#stack_trace[@]} -eq 0 ]]; then
		return 0
	fi
	local frame="${stack_trace[${#stack_trace[@]} - 1]}"
	local filename
	local lineno
	local failed_line
	local failed_command

bats_frame_filename "$frame" 'filename'
	bats_frame_lineno "$frame" 'lineno'
	bats_extract_line "$filename" "$lineno" 'failed_line'
	bats_strip_string "$failed_line" 'failed_command'
	local quoted_failed_command
	bats_quote_code quoted_failed_command "$failed_command"
	printf '#   %s ' "${quoted_failed_command}"

if [[ "${BATS_TIMED_OUT-NOTSET}" != NOTSET ]]; then
		# the other values can be safely overwritten here,
		# as the timeout is the primary reason for failure
		BATS_ERROR_SUFFIX=" due to timeout"
	fi

if [[ "$BATS_ERROR_STATUS" -eq 1 ]]; then
		printf 'failed%s\n' "$BATS_ERROR_SUFFIX"
	else
		printf 'failed with status %d%s\n' "$BATS_ERROR_STATUS" "$BATS_ERROR_SUFFIX"
	fi
}

bats_frame_lineno() {
	printf -v "$2" '%s' "${1%% *}"
}

bats_frame_function() {
	local __bff_function="${1#* }"
	printf -v "$2" '%s' "${__bff_function%% *}"
}

bats_frame_filename() {
	local __bff_filename="${1#* }"
	__bff_filename="${__bff_filename#* }"

if [[ "$__bff_filename" == "${BATS_TEST_SOURCE-}" ]]; then
		__bff_filename="$BATS_TEST_FILENAME"
	fi
	printf -v "$2" '%s' "$__bff_filename"
}

bats_extract_line() {
	local __bats_extract_line_line
	local __bats_extract_line_index=0

while IFS= read -r __bats_extract_line_line; do
		if [[ "$((++__bats_extract_line_index))" -eq "$2" ]]; then
			printf -v "$3" '%s' "${__bats_extract_line_line%$'\r'}"
			break
		fi
	done <"$1"
}

bats_strip_string() {
	[[ "$1" =~ ^[[:space:]]*(.*)[[:space:]]*$ ]]
	printf -v "$2" '%s' "${BASH_REMATCH[1]}"
}

bats_trim_filename() {
	printf -v "$2" '%s' "${1#"$BATS_CWD"/}"
}

# normalize a windows path from e.g. C:/directory to /c/directory
# The path must point to an existing/accessable directory, not a file!
bats_normalize_windows_dir_path() { # <output-var> <path>
	local output_var="$1" path="$2"
	if [[ "$output_var" != NORMALIZED_INPUT ]]; then
		local NORMALIZED_INPUT
	fi
	if [[ $path == ?:* ]]; then
		NORMALIZED_INPUT="$(cd "$path" || exit 1; pwd)"
	else
		NORMALIZED_INPUT="$path"
	fi
	printf -v "$output_var" "%s" "$NORMALIZED_INPUT"
}

bats_emit_trace() {
	if [[ $BATS_TRACE_LEVEL -gt 0 ]]; then
		local line=${BASH_LINENO[1]}
		# shellcheck disable=SC2016
		if [[ $BASH_COMMAND != '"$BATS_TEST_NAME" >> "$BATS_OUT" 2>&1 4>&1' && $BASH_COMMAND != "bats_test_begin "* ]] && # don't emit these internal calls
			[[ $BASH_COMMAND != "$BATS_LAST_BASH_COMMAND" || $line != "$BATS_LAST_BASH_LINENO" ]] &&
			# avoid printing a function twice (at call site and at definition site)
			[[ $BASH_COMMAND != "$BATS_LAST_BASH_COMMAND" || ${BASH_LINENO[2]} != "$BATS_LAST_BASH_LINENO" || ${BASH_SOURCE[3]} != "$BATS_LAST_BASH_SOURCE" ]]; then
			local file="${BASH_SOURCE[2]}" # index 2: skip over bats_emit_trace and bats_debug_trap
			if [[ $file == "${BATS_TEST_SOURCE}" ]]; then
				file="$BATS_TEST_FILENAME"
			fi
			local padding='$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$'
			if (( BATS_LAST_STACK_DEPTH != ${#BASH_LINENO[@]} )); then
				printf '%s [%s:%d]\n' "${padding::${#BASH_LINENO[@]}-4}" "${file##*/}" "$line" >&4
			fi
			printf '%s %s\n'  "${padding::${#BASH_LINENO[@]}-4}" "$BASH_COMMAND"  >&4
			BATS_LAST_BASH_COMMAND="$BASH_COMMAND"
			BATS_LAST_BASH_LINENO="$line"
			BATS_LAST_BASH_SOURCE="${BASH_SOURCE[2]}"
			BATS_LAST_STACK_DEPTH="${#BASH_LINENO[@]}"
		fi
	fi
}

# bats_debug_trap tracks the last line of code executed within a test. This is
# necessary because $BASH_LINENO is often incorrect inside of ERR and EXIT
# trap handlers.
#
# Below are tables describing different command failure scenarios and the
# reliability of $BASH_LINENO within different the executed DEBUG, ERR, and EXIT
# trap handlers. Naturally, the behaviors change between versions of Bash.
#
# Table rows should be read left to right. For example, on bash version
# 4.0.44(2)-release, if a test executes `false` (or any other failing external
# command), bash will do the following in order:
# 1. Call the DEBUG trap handler (bats_debug_trap) with $BASH_LINENO referring
#    to the source line containing the `false` command, then
# 2. Call the DEBUG trap handler again, but with an incorrect $BASH_LINENO, then
# 3. Call the ERR trap handler, but with a (possibly-different) incorrect
#    $BASH_LINENO, then
# 4. Call the DEBUG trap handler again, but with $BASH_LINENO set to 1, then
# 5. Call the EXIT trap handler, with $BASH_LINENO set to 1.
#
# bash version 4.4.20(1)-release
#  command     | first DEBUG | second DEBUG | ERR     | third DEBUG | EXIT
# -------------+-------------+--------------+---------+-------------+--------
#  false       | OK          | OK           | OK      | BAD[1]      | BAD[1]
#  [[ 1 = 2 ]] | OK          | BAD[2]       | BAD[2]  | BAD[1]      | BAD[1]
#  (( 1 = 2 )) | OK          | BAD[2]       | BAD[2]  | BAD[1]      | BAD[1]
#  ! true      | OK          | ---          | BAD[4]  | ---         | BAD[1]
#  $var_dne    | OK          | ---          | ---     | BAD[1]      | BAD[1]
#  source /dne | OK          | ---          | ---     | BAD[1]      | BAD[1]
#
# bash version 4.0.44(2)-release
#  command     | first DEBUG | second DEBUG | ERR     | third DEBUG | EXIT
# -------------+-------------+--------------+---------+-------------+--------
#  false       | OK          | BAD[3]       | BAD[3]  | BAD[1]      | BAD[1]
#  [[ 1 = 2 ]] | OK          | ---          | BAD[3]  | ---         | BAD[1]
#  (( 1 = 2 )) | OK          | ---          | BAD[3]  | ---         | BAD[1]
#  ! true      | OK          | ---          | BAD[3]  | ---         | BAD[1]
#  $var_dne    | OK          | ---          | ---     | BAD[1]      | BAD[1]
#  source /dne | OK          | ---          | ---     | BAD[1]      | BAD[1]
#
# [1] The reported line number is always 1.
# [2] The reported source location is that of the beginning of the function
#     calling the command.
# [3] The reported line is that of the last command executed in the DEBUG trap
#     handler.
# [4] The reported source location is that of the call to the function calling
#     the command.
bats_debug_trap() {
	# on windows we sometimes get a mix of paths (when install via nmp install -g)
	# which have C:/... or /c/... comparing them is going to be problematic.
	# We need to normalize them to a common format!
	local NORMALIZED_INPUT
	bats_normalize_windows_dir_path NORMALIZED_INPUT "${1%/*}"
	local file_excluded='' path
	for path in "${BATS_DEBUG_EXCLUDE_PATHS[@]}"; do
		if [[ "$NORMALIZED_INPUT" == "$path"* ]]; then
			file_excluded=1
			break
		fi
	done
	
	# don't update the trace within library functions or we get backtraces from inside traps
	# also don't record new stack traces while handling interruptions, to avoid overriding the interrupted command
	if [[ -z "$file_excluded" && 
			"${BATS_INTERRUPTED-NOTSET}" == NOTSET &&
			"${BATS_TIMED_OUT-NOTSET}" == NOTSET ]]; then
		BATS_DEBUG_LASTLAST_STACK_TRACE=(
			${BATS_DEBUG_LAST_STACK_TRACE[@]+"${BATS_DEBUG_LAST_STACK_TRACE[@]}"}
		)

BATS_DEBUG_LAST_LINENO=(${BASH_LINENO[@]+"${BASH_LINENO[@]}"})
		BATS_DEBUG_LAST_SOURCE=(${BASH_SOURCE[@]+"${BASH_SOURCE[@]}"})
		bats_capture_stack_trace
		bats_emit_trace
	fi
}

# For some versions of Bash, the `ERR` trap may not always fire for every
# command failure, but the `EXIT` trap will. Also, some command failures may not
# set `$?` properly. See #72 and #81 for details.
#
# For this reason, we call `bats_check_status_from_trap` at the very beginning
# of `bats_teardown_trap` and check the value of `$BATS_TEST_COMPLETED` before
# taking other actions. We also adjust the exit status value if needed.
#
# See `bats_exit_trap` for an additional EXIT error handling case when `$?`
# isn't set properly during `teardown()` errors.
bats_check_status_from_trap() {
	local status="$?"
	if [[ -z "${BATS_TEST_COMPLETED:-}" ]]; then
		BATS_ERROR_STATUS="${BATS_ERROR_STATUS:-$status}"
		if [[ "$BATS_ERROR_STATUS" -eq 0 ]]; then
			BATS_ERROR_STATUS=1
		fi
		trap - DEBUG
	fi
}

bats_add_debug_exclude_path() { # <path>
	if [[ -z "$1" ]]; then # don't exclude everything
		printf "bats_add_debug_exclude_path: Exclude path must not be empty!\n" >&2
		return 1
	fi
	if [[ "$OSTYPE" == cygwin || "$OSTYPE" == msys ]]; then
		local normalized_dir
		bats_normalize_windows_dir_path normalized_dir "$1"
		BATS_DEBUG_EXCLUDE_PATHS+=("$normalized_dir")
	else
		BATS_DEBUG_EXCLUDE_PATHS+=("$1")
	fi
}

bats_setup_tracing() {
	# Variables for capturing accurate stack traces. See bats_debug_trap for
	# details.
	#
	# BATS_DEBUG_LAST_LINENO, BATS_DEBUG_LAST_SOURCE, and
	# BATS_DEBUG_LAST_STACK_TRACE hold data from the most recent call to
	# bats_debug_trap.
	#
	# BATS_DEBUG_LASTLAST_STACK_TRACE holds data from two bats_debug_trap calls
	# ago.
	#
	# BATS_DEBUG_LAST_STACK_TRACE_IS_VALID indicates that
	# BATS_DEBUG_LAST_STACK_TRACE contains the stack trace of the test's error. If
	# unset, BATS_DEBUG_LAST_STACK_TRACE is unreliable and
	# BATS_DEBUG_LASTLAST_STACK_TRACE should be used instead.
	BATS_DEBUG_LASTLAST_STACK_TRACE=()
	BATS_DEBUG_LAST_LINENO=()
	BATS_DEBUG_LAST_SOURCE=()
	BATS_DEBUG_LAST_STACK_TRACE=()
	BATS_DEBUG_LAST_STACK_TRACE_IS_VALID=
	BATS_ERROR_SUFFIX=
	BATS_DEBUG_EXCLUDE_PATHS=()
	# exclude some paths by default
	bats_add_debug_exclude_path "$BATS_ROOT/lib/"
	bats_add_debug_exclude_path "$BATS_ROOT/libexec/"

exec 4<&1 # used for tracing
	if [[ "${BATS_TRACE_LEVEL:-0}" -gt 0 ]]; then
		# avoid undefined variable errors
		BATS_LAST_BASH_COMMAND=
		BATS_LAST_BASH_LINENO=
		BATS_LAST_BASH_SOURCE=
		BATS_LAST_STACK_DEPTH=
		# try to exclude helper libraries if found, this is only relevant for tracing
		while read -r path; do
			bats_add_debug_exclude_path "$path"
		done < <(find "$PWD" -type d -name bats-assert -o -name bats-support)
	fi

local exclude_paths path
	# exclude user defined libraries
	IFS=':' read -r exclude_paths <<< "${BATS_DEBUG_EXCLUDE_PATHS:-}"
	for path in "${exclude_paths[@]}"; do
		if [[ -n "$path" ]]; then
			bats_add_debug_exclude_path "$path"
		fi
	done

# turn on traps after setting excludes to avoid tracing the exclude setup
	trap 'bats_debug_trap "$BASH_SOURCE"' DEBUG
  	trap 'bats_error_trap' ERR
}

bats_error_trap() {
  bats_check_status_from_trap

# If necessary, undo the most recent stack trace captured by bats_debug_trap.
  # See bats_debug_trap for details.
  if [[ "${BASH_LINENO[*]}" = "${BATS_DEBUG_LAST_LINENO[*]:-}"
     && "${BASH_SOURCE[*]}" = "${BATS_DEBUG_LAST_SOURCE[*]:-}" 
	 && -z "$BATS_DEBUG_LAST_STACK_TRACE_IS_VALID" ]]; then
    BATS_DEBUG_LAST_STACK_TRACE=(
      ${BATS_DEBUG_LASTLAST_STACK_TRACE[@]+"${BATS_DEBUG_LASTLAST_STACK_TRACE[@]}"}
    )
  fi
  BATS_DEBUG_LAST_STACK_TRACE_IS_VALID=1
}

bats_interrupt_trap() {
  # mark the interruption, to handle during exit
  BATS_INTERRUPTED=true
  BATS_ERROR_STATUS=130
  # debug trap fires before interrupt trap but gets wrong linenumber (line 1)
  # -> use last stack trace
  exit $BATS_ERROR_STATUS
}

# this is used inside run()
bats_interrupt_trap_in_run() {
  # mark the interruption, to handle during exit
  BATS_INTERRUPTED=true
  BATS_ERROR_STATUS=130
  BATS_DEBUG_LAST_STACK_TRACE_IS_VALID=true
  exit $BATS_ERROR_STATUS
}

BATAL