The forematter's discuss from bobthecow

forematter's Issues

undefined method `downcase' for nil:NilClass (NoMethodError)

when querying a particular element that does not exist

$ find content/ -type f -name '*.md' | xargs fore list tags                                                                                                              
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/forematter-0.1.0/lib/forematter/commands/list.rb:13:in `each': undefined method `downcase' for nil:NilClass (NoMethodError)
        from /usr/local/rvm/gems/ruby-2.0.0-p247/gems/forematter-0.1.0/lib/forematter/commands/list.rb:13:in `sort_by'
        from /usr/local/rvm/gems/ruby-2.0.0-p247/gems/forematter-0.1.0/lib/forematter/commands/list.rb:13:in `run'
        from /usr/local/rvm/gems/ruby-2.0.0-p247/gems/forematter-0.1.0/lib/forematter/command_runner.rb:6:in `call'
        from /usr/local/rvm/gems/ruby-2.0.0-p247/gems/cri-2.4.1/lib/cri/command_dsl.rb:185:in `block in runner'
        from /usr/local/rvm/gems/ruby-2.0.0-p247/gems/cri-2.4.1/lib/cri/command.rb:298:in `call'
        from /usr/local/rvm/gems/ruby-2.0.0-p247/gems/cri-2.4.1/lib/cri/command.rb:298:in `run_this'
        from /usr/local/rvm/gems/ruby-2.0.0-p247/gems/cri-2.4.1/lib/cri/command.rb:251:in `run'
        from /usr/local/rvm/gems/ruby-2.0.0-p247/gems/cri-2.4.1/lib/cri/command.rb:264:in `run'
        from /usr/local/rvm/gems/ruby-2.0.0-p247/gems/forematter-0.1.0/lib/forematter.rb:36:in `run'
        from /usr/local/rvm/gems/ruby-2.0.0-p247/gems/forematter-0.1.0/bin/fore:10:in `<top (required)>'

don't crash with stack trace for recoverable errors

Case 1:
when processing a list of files, rescue from File Not Found RuntimeError, print the error to standard error, and continue with the rest of the files in the list. Exit with non-zero status to indicate not all files were processed as requested.

Case 2:
When attempting to perform an operation that doesn't make sense, i.e. adding to an element that is not a set, print an error message to standard error and exit with non-zero status, but don't print a stack trace.

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