#!/bin/sh

# ZODIAC - a simple static site generator
# Copyright (c) 2011 Chase Allen James <nx-zodiac@nu-ex.com>

zod_lib=ZODLIB_PATH

proj="$1"
target="$2"

_zod_error() {
  echo -e ">>> ERROR: $*" >&2
  exit 1
}

_zod_config() {
  cat - "$cfg" <<!
[parse]
htm,html
[parse_convert]
md  awk -f "$zod_lib/markdown.awk"
[ignore]
helpers.awk
*.layout
*.meta
config
!
}

_zod_find_opt_builder() {
  phase="$1"
  _zod_config |
  awk -f "$zod_lib/config.awk" \
      -f "$zod_lib/opt_builder.awk" \
      -v phase="$phase"
}

_zod_destination() {
  file="$1"
  # Find the target directory if one must be created
  subdir="${file%/*}"
  subdir="${subdir#$proj}"
  if [ "$subdir" ]; then
    destination="$target$subdir"
    mkdir -p "$destination"
  else
    # There is no directory to create in target,
    # i.e. file is in the root of the project
    destination="$target"
  fi
  echo $destination;
}

_zod_render() {
  file="$1"
  ext="${file##*.}"
  meta="${file%.$ext}.meta"

  set -- -f "$zod_lib/config.awk"
  set -- "$@" -f "$zod_lib/render.awk"
  [ -f "$proj/helpers.awk" ] && set -- "$@" -f "$proj/helpers.awk"
  set -- "$@" -
  [ -f "$proj/global.meta" ] && set -- "$@" "$proj/global.meta"
  [ -f "$meta" ] && set -- "$@" "$meta"
  set -- "$@" "$file"
  [ -f "$proj/main.layout" ] && set -- "$@" "$proj/main.layout"

  page="${file##*/}"
  page="${page%.$ext}.html"
  destination=$(_zod_destination "$file")
  _zod_config | awk "$@" > "$destination/$page"
}

_zod_copy() {
  file="$1"
  destination="$(_zod_destination "$file")"
  cp "$file" "$destination"
}

_zod_exec() {
  phase="$@"
  set -- "$proj" -type f
  for instruction in $(_zod_find_opt_builder "$phase" "$cfg"); do
    inst=$(echo $instruction | sed 's/"//g')
    case $inst in
      or  ) set -- "$@" -o;;
      not ) set -- "$@" !;;
      *   ) set -- "$@" -name "$inst";;
    esac
  done
  find "$@" | while read -r file; do
    case "$phase" in
      render  ) _zod_render "$file";;
      copy    ) _zod_copy "$file";;
    esac
  done
}

[ "$#" -ne 2 ] && { echo "usage: zod projectdir targetdir"; exit; }
[ ! -d "$proj" ] && _zod_error "project directory does not exist"
[ ! -d "$target" ] && _zod_error "target directory does not exist"

[ -f "$proj/.zod/config" ] && cfg="$proj/.zod/config"

_zod_exec "render"
_zod_exec "copy"