Create Launcher

#!/bin/bash
#
# Create Launcher 0.1
# A simple Nautilus script to create Unity launchers by right-clicking on files
#
# by Hasan N. Genc

file="$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS"
file=${file%$'\n'}

# Make sure only one file has been selected
if [[ $(printf "$file" | wc -l) > 0 ]]; then
  zenity --error --text="Do not select more than one file."
  exit 1
fi

# Make sure that selected file is an executable
if ! [[ -x $file ]]; then
  zenity --error --text="You must select a file which can be executed."
  exit 1
fi

# Get the launcher's name
launcher_name=$(zenity --entry --title="Enter launcher name" --text="Enter name of launcher" --entry-text "${file##*/}" --cancel-label=Quit --width=300)

if [[ $? != 0 ]]; then
  exit 1
fi

# Get the launcher's exec command
launcher_exec=$(zenity --entry --title="Enter command" --text="Enter command to be executed by launcher" --entry-text "\"$file\"" --cancel-label=Quit --width=500)

if [[ $? != 0 ]]; then
  exit 1
fi

# Get the launcher's icon
if zenity --question --text="Do you want to give the launcher a specific icon?"; then
  launcher_icon=$(zenity --file-selection --title="Select icon (cancel if you want to use default icon)")
fi

# Create the launcher file using the previously obtained information
destination="$launcher_name.desktop"
printf "[Desktop Entry]\nType=Application\nTerminal=false\nName=$launcher_name\nExec=$launcher_exec\nIcon=$launcher_icon" >"$destination"

# If the script tries to create the launcher in a folder that it does not have permission to do so, the previous printf command will fail. In that case, let the user choose where to save the launcher
if [[ $? != 0 ]]; then
  zenity --error --text="The launcher cannot be saved in your current directory. Please select a new location to save the launcher."

  destination=$(zenity --file-selection --title="Select where to save launcher" --save --confirm-overwrite --file-filter="All files | *.*" --file-filter="Desktop files (.desktop) | *.desktop" )

  if [[ $? != 0 ]]; then
    exit 1
  fi

  if [[ $destination != *.desktop ]]; then
    destination="$destination.desktop"
  fi
fi

until printf "[Desktop Entry]\nType=Application\nTerminal=false\nName=$launcher_name\nExec=$launcher_exec\nIcon=$launcher_icon" >"$destination"; do
  zenity --error --text="The launcher cannot be saved in this directory. Please select a new location to save the launcher."

  destination=$(zenity --file-selection --title="Select where to save launcher" --save --confirm-overwrite --file-filter="All files | *.*" --file-filter="Desktop files (.desktop) | *.desktop" )

  if [[ $? != 0 ]]; then
    exit 1
  fi

  if [[ $destination != *.desktop ]]; then
    destination="$destination.desktop"
  fi
done

# Make the launcher executable
chmod +x "$destination"

exit 0