JOPA

Code

Development of Jopa happens on GitHub, but you don't need to go there to grab the code. Here is the full Jopa code, just 62 lines:

#!/usr/bin/env bash

export from=${from-"$PWD/pages"}
export to=${to-"$PWD/www"}
export ext=${ext-".html"}
export indexes=${indexes-"$from/index.jsh"}
export layout_file=${layout_file-"layout.jsh"}
shopt -s nullglob
export pages=${pages-"$from/*.jsh"}

multiline() { # multiline [markdown] varname << 'JOPA'
  if [[ "$#" -eq 2 ]]; then 
    read -r -d '' "${@:2}"
    read -r -d '' $2 <<< "$($1 <<< "${!2}")"
  else
    read -r -d '' "$@"
  fi
}

page_id() { echo "_page_env_${1//[^a-zA-Z0-9]/_}"; }
read_page() {
  set -a
  src="${1##*/}"
  target="${src%.*}$ext"
  source "$1" >&2
}
store_page() { printf -v $(page_id $1) '%s' "$(read_page $1; declare -px)"; }
load_page() { local id=$(page_id $1); echo "${!id}"; }

each() {
  for p in $1; do
    (set -a; eval "$(load_page $p)"; "${@:2}")
  done
}

render() { envsubst <<< "$1"; }

to_layout() {
  [[ ! "$layout" && -f "$layout_file" ]] && source "$layout_file" >&2
  render "$layout" > "$to/$target"
}

process() { each "$pages $indexes" to_layout; }

jopa() {
  mkdir -p "$to"
  pages="$(for p in $pages; do
             for i in $indexes; do [[ "$p" -ef "$i" ]] && continue 2; done
             echo $p
           done)"
  for p in $pages; do store_page $p; done
  for i in $indexes; do store_page $i; done
  process
}

if [[ "$0" = "$BASH_SOURCE" ]]; then
  if [[ "$#" -ne 0 ]]; then
    printf "$0 does not accept any arguments; use env variables instead"
    exit 1
  fi
  jopa
fi

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