#! /bin/sh
#
# Configures and builds nmh.
# * If this script is not invoked from an nmh source directory, it
#   will attempt to download the nmh sources.
# * This script retrieves configuration from the first existing nmh
#   installation on your $PATH, if any.
# * Unless the -y option is provided, this script then interactively
#   walks you through confirmation of common configuration settings.
#
# This file can be downloaded and immediately run using, e.g.,
#   wget http://git.savannah.gnu.org/cgit/nmh.git/plain/build_nmh
#   sh build_nmh
#
# Typical usage:
# The first time you invoke this script, use the -i option to install
# nmh in the specified location.  The script will walk you through the
# common nmh configuration settings.  The -v option will cause display
# of brief progress indicators.  Be sure to add the bin directory of
# the install location to your $PATH, if not already there.
# Subsequently, invoke this script with the -y option, to use the
# relevant configuration settings from the installed nmh without
# confirmation.
#
# Option summary:
#   First time use:
#     -b <branch> to specify branch to check out, only if downloading sources
#     -i to install nmh
#     -v to display progress
#   Subsequent uses, assuming installed nmh bin directory is on $PATH:
#     -y to accept all configuration options without confirmation
#   Output control:
#     -l <logfile name>, default 'build_nmh.log', - for stdout/stderr
#   Advanced/developer use:
#     -c to run 'make distcheck' instead of 'make check'
#     -d to build nmh with asserts enabled and optimization disabled
#     -s to use 'make superclean': requires recent autoconf and automake,
#        see docs/README.developers
#     -r to build rpm
#
# To disable colorization of the test summary, either unset the TERM
# environment variable or set it to dumb, e.g., TERM=dumb build_nmh.
#
# See the nmh MACHINES file for build prerequisites.  In addition, the rpmbuild
# is required to be available if the -r option is used.

logfile=build_nmh.log
usage="usage:
  [-b <branch>, only if downloading]
  [-c to run 'make distcheck' instead of 'make check']
  [-d to build nmh with asserts enabled and optimization disabled]
  [-i to install nmh]
  [-l <logfile name>, default '$logfile']
  [-r to build rpm]
  [-s to use 'make superclean': requires recent autoconf and automake]
  [-v to display progress]
  [-y to accept all configuration options without confirmation]"

#### Find location of a program.  Bourne shell just puts the name in
#### $0 if it's found from the PATH, so search that if necessary.
finddir() {
  case $1 in
    */*) dirname "$1" ;;
    *  ) IFS=:
         for d in $PATH; do
           [ -f "${d:=.}/$1"  -a  -x "$d/$1" ]  &&  printf %s "$d"  &&  break
         done ;;
  esac
}

#### Make sure user sees error output even on early termination.
cleanup() {
  if [ "$tmpfile" ]; then
    #### Disable output redirection (and flush) so that we can grep.
    #### If $tmpfile is null, don't need to do this because the
    #### outputs weren't redirected, modulo a small race condition
    #### between setting tmpfile and redirecting the outputs.
    exec 1>&3 3>&- 2>&4 4>&-

    if [ "$logfile" != - ]; then
      exec 3>&1 >"$logfile" 2>&1
    fi

    if [ -f "$tmpfile" ]; then
      cat "$tmpfile"
      grep -E 'Error|warn' "$tmpfile"
      rm "$tmpfile"
    fi
  fi

  #### Put info message on stdout, and in log if not stdout.
  if [ $status -ne 0  -o  $verbose -ge 1  -o  "$directory" ]; then
    [ $status -eq 0 ]  &&  result=succeeded  ||  result=failed
    if [ "$logfile" = - ]; then
      echo "build $result"
    else
      message="build $result, build log is in ${directory:+$directory/}$logfile"
      echo "$message" >&3
    fi
  fi

  #### Heirloom shell does not like "trap - signal".
  trap '' EXIT
  exit $status
}

#### Exit with error message.
die() {
  status=1 # It should already be, but just in case the code below changes.
  echo "$0: $*" 1>&2
  cleanup
}

#### Download sources from repo.  With git and on master, the
#### directory will be nmh, but with snapshot, it will be
#### nmh-master.
download_sources() {
  [ $verbose -ge 1 ]  &&  echo downloading . . . >&3
  gitdir=`finddir git`
  if [ "$gitdir" ]; then
    #### Use git repo.
    [ "$verbose" -eq 0 ]  &&  git_opts=--quiet
    [ "$branch" = master ]  ||
      git_opts="${git_opts:+$git_opts }--branch $branch"
    if "$gitdir"/git clone --depth 1 $git_opts "git://$gitrepo/nmh.git" >&3
    then
      directory=nmh
      cd "$directory"  ||  die "failed to clone $directory"
      printf "commit %s\n" `git log --max-count=1 --pretty=format:%H`
    else
      die 'failed to clone git repo'
    fi
  else
    [ -e nmh-"$branch" ]  &&  die "nmh-$branch exists, will not overrwrite"

    #### Use snapshot.
    tarball="nmh-$branch.tar.gz"
    repo="http://$gitrepo/cgit/nmh.git/snapshot"
    snapshot="$repo/$tarball"
    if [ "`finddir wget`" ]; then
      [ "$verbose" -eq 0 ] && wget_opts='--quiet'
      wget --output-document - $wget_opts "$snapshot" 2>&3 | gzip -d | tar xf -
    elif [ "`finddir curl`" ]; then
      [ "$verbose" -eq 0 ] && curl_opts='--silent --show-error'
      curl --location $curl_opts "$snapshot" 2>&3 | gzip -d | tar xf -
    else
      die 'unable to find program to download nmh sources'
    fi

    if [ -d nmh-"$branch" ]; then
      directory=nmh-"$branch"
      cd "$directory"  ||  die "failed to download and extract $directory"
    else
      die "failed to download nmh-$branch sources"
    fi
  fi
}

directory=
download=0
gitrepo=git.savannah.nongnu.org
invocation="$0 $*"
status=1
tmpfile=/tmp/build_nmh-$$.log

#### Redirect all output to tmp file.  Then on EXIT, copy it to either
#### logfile or stdout.  Also, grep it for errors and warnings.  Set
#### tmpfile just prior to this, see cleanup().
exec 3>&1 4>&2 >"$tmpfile" 2>&1


####
#### Interpret command arguments.
####
branch=master
check=check
debug=0
install=0
build_rpm=0
superclean=0
verbose=0
yes=0

#### With dash, heirloom shell, and posh, need to catch INT and QUIT
#### in order for cleanup to be call:  just EXIT isn't sufficient.
trap cleanup EXIT INT QUIT

while getopts 'cb:dil:rsvy?' arg; do
  case $arg in
    b  ) branch="$OPTARG" ;;
    c  ) check=distcheck ;;
    d  ) debug=1 ;;
    i  ) install=1 ;;
    l  ) logfile=$OPTARG ;;
    r  ) build_rpm=1 ;;
    s  ) superclean=1 ;;
    v  ) verbose=1 ;;
    y  ) yes=1 ;;
    '?') echo "$0: $usage"; logfile=-; status=0; exit ;;
  esac
done
shift `expr $OPTIND - 1`

echo "$invocation"

#### No non-option command line arguments are supported.
[ $# -gt 0 ]  &&  die "$usage"

#### Check to see that we're in a nmh source directory.
if grep 'the authors of nmh' COPYRIGHT >/dev/null 2>&1; then
  :
else
  download=1
fi

####
#### Set up configure options.
####

#### Here are the config options that we will try to detect, then
#### confirm, and finally set.
config_prefix=/usr/local/nmh
config_locking=
config_mts=smtp
config_smtpserver=localhost
config_sasl='determined by configure'
config_tls='determined by configure'
config_debug=n


#### Figure out whether or not to use -n with tail.
case `printf 'OK\n' | tail -n 1 2>&1` in
  OK) tail='tail -n ' ;;
  *)  tail='tail -' ;;
esac

if install-mh -check >/dev/null 2>&1; then
  #### Determine config options from installed nmh.
  mhbin=`finddir install-mh`

  config_prefix=`cd $mhbin/.. && pwd`

  mtsconf=`mhparam etcdir`/mts.conf
  if [ -f "$mtsconf" ]; then
    mts_entry=`grep '^mts:' "$mtsconf"`
    if [ "$mts_entry" ]; then
      mts=`echo "$mts_entry" | sed -e 's/^mts: *//'`
      if [ "$mts"  -a  "$mts" != smtp ]; then
        config_mts="$mts"
      fi
    fi

    mtsconfservers=`grep '^servers:' "$mtsconf"`
    if [ "$mtsconfservers" ]; then
      servers=`echo "$mtsconfservers" | sed -e 's/^servers: *//'`
      [ "$servers" ]  &&  config_smtpserver="$servers"
    fi
  fi

  if test -x "$mhbin/mhparam"; then
    if mhparam sasl >/dev/null; then
      case `$mhbin/mhparam sasl` in
        *sasl*) config_sasl=y ;;
      esac

      case `$mhbin/mhparam tls` in
        *tls*) config_tls=y ;;
      esac
    else
      tput smso
      echo "$0: SASL and TLS detection not supported with current nmh"
      [ $yes -eq 1 ]  &&  echo "configure will determine whether to enable"
      tput rmso
    fi
  fi
fi

#### Don't confirm debug interactively below; obey the -d option.
[ $debug -ge 1 ]  &&  config_debug=y

if [ $yes -eq 0 ]; then
  #### Confirm each config setting with user.
  printf 'Install prefix [%s]: ' $config_prefix >&3
  read prefix
  [ "$prefix" ]  &&  config_prefix="$prefix"

  printf 'Locking type (dot|fcntl|flock|lockf) [determined by configure]: ' >&3
  read locking
  [ "$locking" ]  &&  config_locking="$locking"

  printf 'MTS (smtp|sendmail/smtp|sendmail/pipe) [%s]: ' $config_mts >&3
  read mts
  [ "$mts" ]  &&  config_mts="$mts"

  if [ "$config_mts" = smtp ]; then
    printf 'SMTP server [%s]: ' $config_smtpserver >&3
    read server
    [ "$server" ]  &&  config_smtpserver="$servers"
  fi

  printf 'Cyrus SASL support (y|n) [%s]: ' "$config_sasl" >&3
  read response
  [ "$response" = y  -o  "$response" = Y ]  &&  config_sasl=y

  printf 'TLS support (y|n) [%s]: ' "$config_tls" >&3
  read response
  [ "$response" = y  -o  "$response" = Y ]  &&  config_tls=y
fi

config_opts="--prefix=$config_prefix"

[ "$config_locking" ]  &&
  config_opts="$config_opts --with-locking=$config_locking"
[ "$config_mts"  -a  "$config_mts" != smtp ]  &&
  config_opts="$config_opts --with-mts=$config_mts"
[ "$config_smtpserver"  -a  "$config_smtpserver" != localhost ]  &&
  config_opts="$config_opts --with-smtpserver=$config_smtpserver"
[ "$config_sasl" = y ]  &&  config_opts="$config_opts --with-cyrus-sasl"
[ "$config_tls" = y ]  &&  config_opts="$config_opts --with-tls"
[ $config_debug = y ]  &&  config_opts="$config_opts --enable-assert"

#### dotlocking, the usual default, requires chgrp and chmod of inc.
installpriv=
if [ $install -ge 1  -a  "$LOGNAME" != root ]; then
  if [ "$config_locking" = dot ]; then
    echo "$0: "'install requires chgrp and chmod 2755'
    echo 'so will sudo to install.  Terminate with Ctrl-C if unacceptable.'
    installpriv=sudo
  fi
fi

printf '\n%s %s %s %s\n\n' "`uname -m`" "`uname -s`" "`uname -r`" "`uname -v`"
[ -f /etc/os-release ]  &&  printf '%s\n\n' "`cat /etc/os-release`"

[ $download -eq 1 ]  &&  download_sources

####
#### Set up with autoconfig if necessary.
####
if [ -f Makefile ]; then
  [ $verbose -ge 1 ]  &&  echo cleaning . . . >&3
  if [ $superclean -ge 1 ]; then
    make superclean >/dev/null
  else
    make distclean >/dev/null
  fi
fi

if [ ! -f configure  -o  ! -f Makefile.in ]; then
  [ $verbose -ge 1 ]  &&  echo autoconfiguring . . . >&3
  ./autogen.sh
  [ $? -ne 0 ]  &&
    die "autogen failed, see MACHINES file for autoconf,
automake, flex, and bison requirements"
fi


####
#### Build.
####
[ $verbose -ge 1 ]  &&  echo configuring . . . >&3
if [ -z "$CFLAGS" ]; then
  #### Only use these flags with gcc.
  if cc -dM -E - </dev/null 2>&1 | grep __GNUC__ >/dev/null; then
    #### configure will supply -g -O2 with gcc, but only if CFLAGS
    #### isn't defined.
    CFLAGS='-g -ansi -pedantic'
    if [ "$config_debug" = n ]; then
      CFLAGS="$CFLAGS -O2"
    else
      CFLAGS="$CFLAGS -O0"
    fi
  fi
fi

printf "\n./configure ${CFLAGS:+CFLAGS=\"${CFLAGS}\" }$config_opts\n"
./configure ${CFLAGS:+CFLAGS="${CFLAGS}"" "}$config_opts
status=$?

if [ $status -eq 0 ]; then
  [ $verbose -ge 1 ]  &&  echo building . . . >&3
  make
  status=$?

  if [ $status -eq 0 ]; then
    if [ "$TESTS_SHELL"x = x ]; then
      #### Bonus:  use heirloom shell to test, if available, and if
      #### TESTS_SHELL hadn't already been set.
      heirloom_shell=/usr/lib/heirloom/5bin/sh
      if [ -x "$heirloom_shell" ]; then
        TESTS_SHELL="$heirloom_shell"; export TESTS_SHELL
      fi
    fi

    if [ "$CFLAGS" ]; then
        #### Pass DISTCHECK_CONFIGURE_FLAGS through an environment
        #### variable to avoid automake's quoting.
        DISTCHECK_CONFIGURE_FLAGS="CFLAGS='${CFLAGS}'"
        export DISTCHECK_CONFIGURE_FLAGS
    fi

    [ $verbose -ge 1 ]  &&  echo testing . . . >&3
    [ "${TERM:-dumb}" = dumb ]  &&  color=no  ||  color=always
    checkoutput=`make $check AM_COLOR_TESTS=$color`
    status=$?

    tests_summary=`echo "$checkoutput" | grep tests`
    #### If multiple tests not run, that line will be caught by the
    #### "grep tests" above.
    test_not_run=`echo "$checkoutput" | grep 'test was not run'`
    fails=`echo "$checkoutput" | grep FAIL`
    if [ "$tests_summary" ]; then
      echo '==================='
      [ "$test_not_run" ]  &&  echo "$test_not_run"
      [ "$fails" ]  &&  echo "$fails"
      echo "$tests_summary"
      echo '==================='
      [ "$check" = distcheck ]  &&  echo "$checkoutput" | ${tail}4
    fi

    if [ $status -eq 0 ]; then
      if [ $install -ge 1 ]; then
        [ $verbose -ge 1 ]  &&  echo installing . . . >&3
        ($installpriv make install) >/dev/null
        status=$?
      fi

      if [ $status -eq 0  -a  $build_rpm -ge 1 ]; then
        [ $verbose -ge 1 ]  &&  echo building rpm . . . >&3
        make rpm >/dev/null
        status=$?
      fi
    fi
  fi
else
  echo "see nmh MACHINES file for build dependences"
fi

#### Will call cleanup, which will exit with $status.
exit