Bugfix: Handle whitespace and broken links

[CharlesEkkel]

I've included two fixes here that I needed to get this script to work for me.

Whitespace

Now escape whitespace in the input_file value. I've seen suggestions online that this may be platform-dependent, but I encountered an issue where pandoc could not handle whitespace in a filename (see line 7):

[I] ~/orgroam_to_obsidian ❯❯❯ ./convert.rb                                                     main ✱ ◼
Loading: Spanish
Loading: Open-source
Loading: Midpoint Method
Loading: UX Design
/home/chuckles/.local/share/gem/ruby/3.0.0/gems/pandoc-ruby-2.1.7/lib/pandoc-ruby.rb:306:in `execute': pandoc: input/roam/articles/ATS3870: openBinaryFile: does not exist (No such file or directory) (RuntimeError)
    from /home/chuckles/.local/share/gem/ruby/3.0.0/gems/pandoc-ruby-2.1.7/lib/pandoc-ruby.rb:275:in `execute_pandoc'
    from /home/chuckles/.local/share/gem/ruby/3.0.0/gems/pandoc-ruby-2.1.7/lib/pandoc-ruby.rb:269:in `convert_string'
    from /home/chuckles/.local/share/gem/ruby/3.0.0/gems/pandoc-ruby-2.1.7/lib/pandoc-ruby.rb:205:in `convert'
    from /home/chuckles/.local/share/gem/ruby/3.0.0/gems/pandoc-ruby-2.1.7/lib/pandoc-ruby.rb:241:in `block (2 levels) in <class:PandocRuby>'
    from ./convert.rb:38:in `input_file_to_md'
    from ./convert.rb:16:in `initialize'
    from ./convert.rb:60:in `new'
    from ./convert.rb:60:in `block in initialize'
    from ./convert.rb:59:in `each'
    from ./convert.rb:59:in `initialize'
    from ./convert.rb:95:in `new'
    from ./convert.rb:95:in `<main>'

Filename in question: ATS3870 Assessment Essay.org

I'm not sure how whitespace ended up in my roam files, since they don't seem to follow the snake-case naming convention, but nonethelesss, I think it makes the script more reslilient. Perhaps I've got some links to those custom org files in my roam files?

Check for bad links

Check for failure to resolve a link using the database. I had this happen to me, seems like a link got broken for me at some point, I figure there should be a graceful alternate behaviour.

Converting: 2021-09-29
./convert.rb:87:in `block in convert_links': undefined method `title' for nil:NilClass (NoMethodError)
    from ./convert.rb:79:in `gsub'
    from ./convert.rb:79:in `convert_links'
    from ./convert.rb:74:in `convert_and_write_note'
    from ./convert.rb:68:in `block in convert'
    from ./convert.rb:68:in `each_key'
    from ./convert.rb:68:in `convert'
    from ./convert.rb:95:in `<main>'

And the note in question once converted:

I started learning [Note not found: Spanish](id:c8689012-48ad-4486-bd27-1cea49545d64)....