#!/bin/bash

#/ NAME
#/     publish-site -- commit files from one dir to a repo/branch/dir
#/
#/ SYNOPSIS
#/     publish site src_dir repo branch dst_dir
#/     publish site # defaults to output . gh-pages .

# figure out the project root under which bin, lib live
shome="$(unset CDPATH; cd -P -- "$(dirname -- "$BASH_SOURCE")/.." && pwd -P)"

# load a jason bourne library
source "$shome/libexec/_jason"

# define command line options:
DEFINE_boolean "clean" "$FLAGS_FALSE" "delete destination branch contents"
DEFINE_string "message" "published $(date)" "commit message for published content" "m"
DEFINE_boolean "force" "$FLAGS_FALSE" "force push to remote" "f"

# entry point
function main {
  if [[ "$#" = 0 ]]; then
    local src_dir="output"
  else
    local src_dir="$1"; shift
  fi

  if [[ "$#" = 0 ]]; then
    local dst_repo="."
  else
    local dst_repo="$1"; shift
  fi

  if [[ "$#" = 0 ]]; then
    local dst_branch="gh-pages"
  else
    local dst_branch="$1"; shift
  fi

  if [[ "$#" = 0 ]]; then
    local dst_dir="."
  else
    local dst_dir="$1"; shift
  fi

  local tmp_dir="$(TMPDIR="$shome/tmp" mktemp -d -t XXXXXXXXX)"

  git clone "$dst_repo" "$tmp_dir"

  pushd "$tmp_dir" > /dev/null
  if ! git checkout "$dst_branch"; then
    # basically git disconnect from paul repo
    git checkout --orphan "$dst_branch"
    git rm -rf .
    touch .gitignore
    git add .gitignore
    git commit -m "initializing disconnected branch $dst_branch"
    git clean -fdx
  fi

  if [[ "$FLAGS_clean" = "$FLAGS_TRUE" ]]; then
    git rm -rf .
    git add -u .
  fi
  popd > /dev/null

  rsync -q -ia -c -O "$src_dir/." "$tmp_dir/$dst_dir"

  pushd "$tmp_dir" > /dev/null
  git add .
  git status -s
  git commit -m "$FLAGS_message" || true
  git push origin "$dst_branch"
  popd > /dev/null
  rm -rf "$tmp_dir"

  local opt_push=
  if [[ "$FLAGS_force" = "$FLAGS_TRUE" ]]; then
    opt_push="-f "
  fi
  git push $opt_push primary $dst_branch:refs/heads/$dst_branch
  git push $opt_push secondary $dst_branch:refs/heads/$dst_branch || true
}

require sub "$BASH_SOURCE" "$@"