#!/bin/bash
# Copyright (C) 2016 Ian Kelling

# Licensed 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.

if [[ -s ~/.bashrc ]];then . ~/.bashrc;fi

#set -x
# arg = git commit to check out

update=false
bootstrap=false
recompile=false
show_pkgs=false
dryrun=false

while [[ $1 == -* ]]; do
  case $1 in
    -b) bootstrap=true; recompile=true ;;
    -n) dryrun=true ;;
    -r) recompile=true ;;
    --no-r) recompile=false ;;
    -u) update=true ;;
    -p) show_pkgs=true ;;
    --) break ;;
    *) echo "$0: error: bad arg: $1" >&2; exit 1 ;;
  esac
  shift
done


# Og = optmize, but keep gdb working
export CFLAGS="-Og -g3"

export DEBIAN_FRONTEND=noninteractive
pupdate

# some distros, the package name is like emacs25, some its just emacs
ver=$(apt-cache showsrc emacs | sed -rn 's/^Version: 1:([0-9]+).*/\1/p' | sort -n | tail -n1) ||:
for x in {35..25} ""; do
  if [[ $ver ]] && (( ver >= x )); then
    echo latest_emacs=emacs
    latest_emacs=emacs
    break
  fi
  if apt-cache showsrc emacs$x 2>/dev/null |grep . &>/dev/null; then
    echo latest_emacs=$x
    latest_emacs=emacs$x
    break
  fi
done

# ccache is a missing build dep for mu
pkgs=(gawk attr autoconf-archive git install-info ccache)
##### warning, apt-rdepends seems to look at the newest version of the package,
##### not the one that build-dep would install.
if $show_pkgs; then
  echo ${pkgs[*]}
  for x in $latest_emacs maildir-utils; do
    # todo, this gives fake provided packages like mailx, and then
    # fai ignores them.
    # https://askubuntu.com/questions/21379/how-do-i-find-the-build-dependencies-of-a-package
    if ! type -p apt-rdepends &>/dev/null; then
      sudo apt-get -y install --purge --auto-remove apt-rdepends
    fi
    apt-rdepends -p --build-depends --follow=DEPENDS $x/$(debian-codename)|sed -rn 's/^\s*Build-Depends: (\S+).*/\1/p'
  done
  exit 0
fi


#building emacs, INSTALL.BZR

# gawk and attr were no longer automatically installed in stretch,
# looking back, i assume i got some error.
# autoconf-archive due to come error
pi ${pkgs[@]}

#git repo
dir=/a/opt/emacs-$(distro-name)$(distro-num)
last_build=$dir/iank-emacs-build

# e/e because autofs failing to mount will make it so
# you cant ls whatever directory it is in, so we
# need an extra directory. i dunno why this was like this instead of just $dir-nox.
#dirs=($dir $dir-nox/.iank/e/e)

dirs=($dir $dir-nox)

m cd /a/opt/emacs

if [[ -e $dir ]]; then
  m cd $dir
  rev=$(cat $last_build 2>/dev/null) ||:
  head=$(git rev-parse HEAD)
  if ! $recompile && ! $bootstrap && [[ $rev == "$head" ]]; then
    echo "already compiled, exiting"
    exit 0
  fi
  if [[ $rev != "$head" ]]; then
    bootstrap=true
  fi
else
  head=$(git rev-parse HEAD)
  bootstrap=true
fi

if $dryrun; then
  echo recompile=$recompile bootstrap=$bootstrap update=$update
  exit 0
fi

if $bootstrap; then
  m rsync --delete -ra /a/opt/emacs/ $dir
  recompile=true
fi

case $(distro-name) in
  fedora )
    logq s yum-builddep -y emacs
    logq pi texlive-dvipng
    ;;&
  debian|ubuntu|trisquel)
    # todo: unknown for other distros, this will fail
    logq p -y build-dep maildir-utils
    # oddly, on ubuntu 14.04 this installs postfix, but I dun care
    # ubuntu 14.04 gave this error message
    # Unable to satisfy the build-depends: Build-Depends: libpng-dev
    # this is satisfied by dvipng. the build-dep is just wrong
    # minor bug I'm not going to bother reporting.
    #
    # note, useful command to see build dep packagages:
    # apt-rdepends --build-depends --follow=DEPENDS emacs25
    logq p -y build-dep $latest_emacs
    ;;&
esac

if $recompile; then

  nox=false
  for d in ${dirs[@]}; do
    if $nox; then
      # Commented stuff in this block had something to do with ssh / autofs, im not really using nox right now,
      # so unless I figure out why it was this way, ignore this.
      # m mkdir -p ${d%/*}
      m rsync --delete -ra $dir/ $d
      #
      # mp=$HOME/.iank/e/e
      # if mountpoint $mp &>/dev/null; then
      #   m sudo umount $mp
      # fi
      # m mkdir -p $mp
      # m sudo mount -o bind $d $mp
      # m sudo chown $USER:$USER $mp
      # m cd $mp

      #  instead of $mp above
      m cd $d
    else
      m cd $d
    fi
    # todo, consider when this should be uncommented
    #logq s make uninstall
    m find ~/.emacs.d/ -name '*.elc' -delete

    # git version
    if [[ $1 ]]; then
      m i clean -xxxfd
    elif $update; then
      m i fetch
      m i clean -xxxffd
      m i reset --hard origin/master
      m i clean -xxxffd
    fi
    # autogen is usually only for the first build, assume it works
    logq ./autogen.sh all
    # I tried changing O2 to O3, don't know if it made it faster or slower so I went back to 02.
    # Also, link-time-optimization based on ./INSTALL

    # for debugging, use -Og, or -O0 to make debug really correspond to sources
    # dunno why I have had -std=gnu99 in the past
    #CFLAGS='-std=gnu99 -g3 -Og'
    export CFLAGS='-g3 -Og'
    #CFLAGS='-std=gnu99 -g3 -O2' logq ./configure --enable-link-time-optimization
    # on ubuntu 12.04, the above fails, says my c compiler won't work, so intead, just use defaults
    if $nox; then
      # mix of flags from arch and debians build flags
      # note, youd think we could just run make again, but the
      # build system isnt smart enough, we have to recompile
      # from scratch.
      logq ./configure --without-x --without-sound --without-gsettings --without-gconf
      ln -s ~/.emacs.d .
    else
      logq ./configure
    fi
    logq make -j `nproc` bootstrap
    logq make -j `nproc`
    if ! $nox; then
      logq sudo make install
      # make emacs always work for root
      sudo /a/exe/lnf /usr/local/bin/emacs /usr/bin
    fi
    nox=true
  done
else
  m cd ${dirs[0]}
  logq sudo make install
  # make emacs always work for root
  m sudo /a/exe/lnf /usr/local/bin/emacs /usr/bin
fi

#git clone https://github.com/djcb/mu
# note: master failed on t8, i moved back to the commit before a bug
# https://github.com/djcb/mu/issues/1400
# from its HACKING file



if $recompile; then
  # note, not totally sure its right to put this within recompile, but its taking up most of the time, so going for it.
  logq emacs --batch -l ~/.emacs.d/compile-init-dir.el
fi

# as of 01-2017, built-in org mode has a bug that
# org-edit-src-exit does not get bound, so using latest
#/a/bin/buildscripts/org-mode

# disabled as i haven't used it in a while
# if $update; then
#   logq pi bzr
#   cd ~/.emacs.d/src/mediawiki-el
#   bzr pull
# fi


# not keeping up with the latest gnus development.
# # instructions from the README
# # the byte-recompile-directory seems to compile gnus,
# # but gnus complains that it should be compiled when it starts
# cd ~/.emacs.d/src/gnus
# if [[ $1 == *u* ]]; then
#     i pull
# fi
# logq ./configure
# logq make

my-update-info-dir

echo $head >$last_build