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Fix server being booted twice#150
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This PR fixes issue#128. The current code actually causes the language server to be booted twice! neovim's LSP support doesn't like this because it means it's receiving two responses for every message it sends.
This was a tricky bug to figure out: It turns out that calling
cli.argvis equivalent to callingparse(). This means that the command-parsing logic is actually run twice, causing the server to be booted twice in some circumstances. I changed the code to usedemandCommand()-- this will output the help message if a command is outputted, and it saves having to make the manual check oncli.argvto output the help command.