File: jk_exec.m4

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

dnl --------------------------------------------------------------------------
dnl
dnl Inspired by Pier works on webapp m4 macros :)
dnl
dnl Version $Id: jk_exec.m4 802231 2009-08-07 21:43:52Z markt $
dnl --------------------------------------------------------------------------

dnl --------------------------------------------------------------------------
dnl JK_EXEC
dnl   Execute a program filtering its output (pretty printing).
dnl
dnl   Parameters:
dnl     $1 => name of the variable containing the return value (error code).
dnl     $2 => name of the binary/script to invoke
dnl     $3 => message used for pretty printing output
dnl     $4 => the directory where the command must be executed
dnl --------------------------------------------------------------------------
AC_DEFUN(
  [JK_EXEC],
  [
    jk_exec_curdir="`pwd`"
    if test -d "$4" ; then
      cd "$4"
    else
      AC_MSG_ERROR([can't switch to directory $4])
    fi

    echo "  invoking \"$2\""
    echo "  in directory \"$4\""
    echo "-1" > retvalue.tmp

    set $2
    jk_exec_file=[$]1
    if test ! -x "${jk_exec_file}" ; then
      cd "${jk_exec_curdir}"
      AC_MSG_ERROR([cannot find or execute \"${jk_exec_file}\" in \"$4\"])
      exit 1
    fi
    unset jk_exec_file

    {
      $2
      echo
      echo "jk_exec_retvalue $?"
    } | {
      jk_exec_ret=0
      while true ; do
        read jk_exec_first jk_exec_line
        if test ! "$?" -eq "0" ; then
          break
        else
          if test "${jk_exec_first}" = "jk_exec_retvalue" ; then
            jk_exec_ret="${jk_exec_line}"
          else
            if test -n "${jk_exec_line}" ; then
             echo "    $3: ${jk_exec_first} ${jk_exec_line}"
            fi
          fi
        fi
      done
      echo "${jk_exec_ret}" > retvalue.tmp
      unset jk_exec_first
      unset jk_exec_line
      unset jk_exec_ret
    }

    $1="`cat retvalue.tmp`"
    rm -f retvalue.tmp
    echo "  execution of \"$2\""
    echo "  returned with value \"${$1}\""

    cd "${jk_exec_curdir}"
    unset jk_exec_curdir
  ])