error_handler.sh

#!/usr/bin/env bash

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

set -eu

_showed_traceback=0

function _breeze_handle_err() {
    local _ec="$?"
    if [[ $_ec != 0 && "${_showed_traceback}" != 0 ]]; then
        traceback 1
        display_code ${BASH_SOURCE[0]} ${BASH_LINENO[1]}
    fi
}

function _breeze_handle_exit() {
    local _ec="$?"
    local _cmd="${BASH_COMMAND:-unknown}"

    traceback 1
    display_code ${BASH_SOURCE[0]} ${BASH_LINENO[1]}

    _showed_traceback=1
    echo "The command ${_cmd} exited with exit code ${_ec}." 1>&2
}

function traceback() {
    # Hide the traceback() call.
    local -i start=$((${1:-0} + 1))
    local -i end=${#BASH_SOURCE[@]}
    local -i i=0
    local -i j=0

    echo "Traceback (last called is first):" 1>&2
    for ((i = start; i < end; i++)); do
        j=$((i - 1))
        local function="${FUNCNAME[$i]}"
        local file="${BASH_SOURCE[$i]}"
        local line="${BASH_LINENO[$j]}"
        printf '%6d  %s() in %s:%s\n' "$j" "${function}" "${file}" "${line}" 1>&2
    done
    echo "" 1>&2
}

function highlight_code {
    local input=${1:-$(</dev/stdin)}
    if command -v pygmentize; then
        printf '%s' "${input}" | pygmentize | cat -n
    else
        printf '%s' "${input}" | cat -n
    fi
}

function display_code() {
    local -i err_line=${2}
    local err_file=${1}
    local -i code_start=$((err_line - 2))
    local -i code_end=$((err_line + 4))
    code_start=$((code_start > 0 ? code_start : 1))

    echo "Last frame in code: [${err_file}:${err_line}]" 1>&2

    cat $err_file | highlight_code | sed -n "${code_start},${code_end}p" 1>&2
    echo "" 1>&2
}