#!/bin/bash -l
# 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.

set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?"' ERR

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

update=false
recompile=true
export FORCE_RECOMPILE=true
show_pkgs=false

while [[ $1 == -* ]]; do
  case $1 in
    --no-r) recompile=false; unset FORCE_RECOMPILE; shift ;;
    -u) update=true; shift ;;
    -p) show_pkgs=true; shift ;;
    --) break ;;
  esac
done

e() { echo "$*"; "$@"; }

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

for x in {35..24}; do
  if apt-cache showsrc emacs$x 2>/dev/null |grep . &>/dev/null; then
    echo $x
    latest_emacs=emacs$x
    break
  fi
done

pkgs=(gawk attr autoconf-archive git install-info)
##### 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`
dir+=`debian-archive` ||: # we may not be on debian

if [[ ! -e $dir ]]; then
  e cp -ar /a/opt/emacs $dir
  recompile=true
fi
e cd $dir

rev=$(cat ~/.local/emacs-build-git-revision 2>/dev/null) ||:
head=$(git rev-parse HEAD)



if $recompile || [[ $rev != "$head" ]]; then

  case $(distro-name) in
    fedora )
      logq s yum-builddep -y emacs
      logq pi texlive-dvipng
      ;;&
    debian|ubuntu|trisquel)
      # todo: unknown for other distros, this will fail
      logq p -y build-dep maildir-utils/$(debian-codename)
      # 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
    # todo, consider when this should be uncommented
    #logq s make uninstall
    find ~/.emacs.d/ -name '*.elc' -delete

    # git version
    if [[ $1 ]]; then
      e i clean -xxxfd
    elif $update; then
      e i fetch
      e i clean -xxxffd
      e i reset --hard origin/master
      e 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
    logq ./configure
    logq make -j `nproc` bootstrap
  fi


  # temporarily for testing multiple versions
  logq make -j `nproc`
  logq sudo make install

  # make emacs always work for root
  s /a/exe/lnf /usr/local/bin/emacs /usr/bin

  echo $head >~/.local/emacs-build-git-revision
fi

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

cd /a/opt/mu

rev=$(cat ~/.local/mu-build-git-revision 2>/dev/null) ||:
head=$(git rev-parse HEAD)
if $recompile || [[ $rev != "$head" ]]; then

  if [[ $(distro-name) == trisquel ]]; then
    # use the flidas branch, stuck behind because
    # needs newer crypt libraries that are too troublesome.
    cd /a/opt/muflidas
  else
    # newer version than build-dep installs for buster
    sudo apt-get -y install --purge --auto-remove libgmime-3.0-dev
  fi
  git clean -xfffd
  ./autogen.sh
  make
  sudo make install
  echo $head >~/.local/mu-build-git-revision
  # note uninstall is implemented
fi

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