#!/bin/bash

filename=$(basename "$1")
tp=`mimetype "$1"`           # get mimetype of the file
tp="${tp#$1:' '}"            # remove path/file from the output to just get the mimetype
                             # get the list of .desktop files for that mimetype
allapps=""                   # checking mimeapps.list and mimeinfo.cache both in .local & /usr
for prepath in "$HOME"/.local /usr 
do
  for mimefile in mimeapps.list mimeinfo.cache
  do
    if [ -f "$prepath"/share/applications/$mimefile ]; then
      apps=`cat "$prepath"/share/applications/$mimefile | grep -m 1 "$tp""="`
      apps="${apps#$tp\=}"   # remove the mimetype from start of line     
      allapps="$allapps;$apps"
    fi
    allapps="${allapps%';'}"   # remove final ;
  done
done
allapps="${allapps#';'}"     # remove extra ; from start of line

uniqapps=`echo "$allapps" | tr ';' '\012' | awk ' !x[$0]++'`  # remove duplicate apps
apps=`echo "$uniqapps" | tr '\012' ';'`                       # get it back onto one line

oldIFS=$IFS
IFS=';'                      # use semi-colon as delimiter
arr=( $apps )                # in array of apps

localpath="$HOME/.local/share/applications" # find local and system paths to each app and store in arr
syspath="/usr/share/applications"
i=0
for app in ${arr[@]}
do
  app_path_filenames=""
  if [ -e "$localpath/$app" ]; then
    app_path_filenames="$localpath/$app"";"
  fi
  if [ -e "$syspath/$app" ]; then
    app_path_filenames="$app_path_filename""$syspath/$app"
  fi
  app_path_filenames="${app_path_filenames%';'}"     # remove extra ; at end of line if it's there
  arr[i++]="$app_path_filenames"
done

i=0                                                  # insert app names into arr from Name= line of .desktop files
for app_path_filename in ${arr[@]}
do
  name=`cat "$app_path_filename" | grep -m 1 "^Name"`
  name="${name#'Name='}"     # remove Name= at start of line
  arr[i++]="$name;$app_path_filename"
done

arr+=( "Other;Other .desktop file" )

# Ask what .desktop file should be used to open $1

desktop_file=`zenity --list --print-column="2" --width=700 --height=400 --title="Open Choose " --text="$filename" --column="Open With ..." --column="Full path to .desktop file" ${arr[@]}`
IFS=$oldIFS                  # restore old delimiter

if [ "$desktop_file" == "Other" ]; then                         # if Other .desktop is desired, let them choose whatever they want
  desktop_file=`zenity --file-selection`
fi

app=""
if [ $desktop_file ]; then
  app=`cat "$desktop_file" | grep -m 1 "^Exec="`                    # find 1st Exec=... in Other .desktop file
  app="${app#'Exec='}"                                              # remove Exec= at start of line
  app="${app%\%*}"                                                  # remove trailing %U or whatever
  app=$( echo "$app" | sed -e 's/^ *//g' -e 's/ *$//g')             # remove trailing and leading spaces
                                            # no need to escape spaces because already done in .desktop files
fi

if [ "$app" ]; then
  to_open="$1"
  to_open=$( echo "$to_open" | sed 's/ /\\ /g' )                    # escape spaces in file to open
  eval "$app $to_open"                                              # finally open it
else
  if [ $desktop_file ]; then
    zenity --error --text="$desktop_file is not a valid .desktop file because it is missing Exec=..."
    exit -1
  fi
fi