#!/bin/bash
#
# Fast way to browse documents stored in an archive.
#

# Parameters
PROGRAM="$0"
BASENAME="`basename $0`"
DOCS="$HOME/data/doc"
BIBLIO="$DOCS/bibliographies"
FILELIST=".filelist"
LIST="$DOCS/$FILELIST"
DOC_PATTERN=".*\.(txt|doc|docx|rtf|pdf|sxc|csv|odt|odf|ods|xls|xlsx|ppt|epub|mobi|djvu|lit)"
FIND_OPTS="-not -path '*.git*' -regextype posix-egrep -iregex"
ARG="$1"
EXTRA_ARG="$2"
DATE="`date +%s`"
MAX_AGE="86400"

# Update the filelist
function __update_filelist {
  echo "Generating new filelist..."

  # Unnanex if it was erroneously annexed
  if [ -h "$LIST" ] && [ -d "$DOCS/.git/annex" ]; then
    ( cd $DOCS && git annex unlock $FILELIST )
  fi

  # Refresh
  cd $DOCS && find . $FIND_OPTS "$DOC_PATTERN" > $LIST

  # Stage
  git add $LIST
}

# Check
if [ -z "$ARG" ]; then
  echo "usage: $BASENAME [option] [<object>] [extra-args]"
  echo "       $BASENAME --refresh"
  echo "       $BASENAME --<program-name> <item-name>"
  echo "       $BASENAME --open           <item-name>"
  echo "       $BASENAME --rifle          <item-name> -p 4"
  echo "       $BASENAME --koreader       <item-name>"
  echo "       $BASENAME --watch          <subfolder>"
  echo "       $BASENAME                  <item-name>"
  exit 1
elif [ "$ARG" == "--refresh" ]; then
  __update_filelist
elif [ ! -d "$DOCS" ]; then
  echo "missing $DOCS folder"
  exit 1
fi

# Check for filelist
if [ ! -e "$LIST" ]; then
  __update_filelist
  CHANGED="`date +%s`"
else
  CHANGED="`stat --printf='%Y\n' $LIST`"
fi

# Automatically refresh lists older than $MAX_AGE
#if ((($DATE - $CHANGED) >= $MAX_AGE)); then
#  __update_filelist
#fi

# Dispatch
#find $DOCS -iname "*$ARG*" | head -1 | while read entry; do xdg-open "$entry"; done
if [ "$ARG" == "--search" ]; then
  shift
  grep -i -- "$*" $LIST
elif [ "$ARG" == "--details" ]; then
  shift
  entry="`echo $* | sed -e 's/^@//'`"
  if grep -qiR -- "$entry" $BIBLIO; then
    grep -iR -- "$entry" $BIBLIO | cut -d : -f 1 | while read file; do
      echo "At $file:"
      echo ""
      # Thanks https://tex.stackexchange.com/questions/28506/how-to-use-a-command-line-tool-to-extract-a-bibtex-reference-that-contains-a-sea
      awk -v RS='\n@' "/${entry}/" $file
    done
  else
    find $DOCS -name ${1}.bib -exec cat {} \;
  fi
elif [ "$ARG" == "--watch" ]; then
  # Convert symlink to full path and start inotifywait loop
  folder="`readlink -f $DOCS`"
  subfolder="$EXTRA_ARG"
  echo "Watching changes at $folder/$subfolder..."

  #while inotifywait -e modify -e create -e move -e delete -r "$folder"; do
  #while inotifywait -e modify -e move -r "$folder"; do
  #while inotifywait -e modify -e move -r "$folder/$subfolder"; do
  while inotifywait -e modify -e create -e move -e delete -r "$folder/$subfolder"; do
    $PROGRAM --refresh
  done
else
  shift 2
  EXTRA_ARGS="$*"

  # Allows for specifying a custom command to open the file
  if [ "${ARG:0:2}" == "--" ] && [ ! -z "$EXTRA_ARG" ]; then
    OPEN="${ARG:2}"
    ARG="$EXTRA_ARG"

    # Shortcuts for xdg-open
    if [ "$OPEN" == "open" ] || [ "$OPEN" == "read" ]; then
      OPEN="xdg-open"
    fi
  else
    OPEN="xdg-open"
    EXTRA_ARGS=""
  fi

  grep -i -- "$ARG" $LIST | while read entry; do
    echo "Opening $entry..."
    cd $DOCS && $OPEN $EXTRA_ARGS "$entry"
  done
fi