contrib/neo_doxygen/sh-lib/errors.sh

   1 #! /bin/bash
   2
   3 # This file is part of NIT ( http://www.nitlanguage.org ).
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 # http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # Error handling.
  18
  19 # The program’s name.
  20 prog_name=$0
  21
  22 # Run the specified command and exit in case of error.
  23 function try {
  24         "$@"
  25         local status=$?
  26         if [ $status -ne 0 ]; then
  27                 >&2 echo "${prog_name}: Error: \`$1\` failed with exit status ${status}."
  28                 trace
  29                 exit "$status"
  30         fi
  31         return 0
  32 }
  33
  34 # Print the stack trace.
  35 function trace {
  36         local frame=0
  37         >&2 caller $frame
  38         local has_next=$?
  39         while [ $has_next = 0 ]; do
  40                 ((frame++));
  41                 >&2 caller $frame
  42                 has_next=$?
  43         done
  44         >&2 echo "---"
  45         return 0
  46 }