The executable for the Alex linter is currently hard-coded as 'alex',
which is an issue given the fact that it conflicts with the Haskell
lexer generator, whose executable is also called 'alex', has been around
a dozen years before the linter, and is packaged in the official
repositories of the major Linux distributions.
This commit adds options to use a local executable for the alex linter
(which is a node package), and an option to set a custom executable.
As side changes:
* The pattern in the alex handler is made more readable by turnig it
into a very-magic regex.
* Alex handles plain text, markdown, and HTML. Specific flags for HTML
and markdown are provided when instantiating the linters for the
respective filetypes, while before those formats were treated as plain
text.
* The project style linter now runs while you type.
* Now the scripts for checking the project require blank lines.
* Many style issues have been found and fixed.
* Add chktex linter
* Alias plaintex to tex
* Add lacheck linter
Closes#179
* Add the chktex warning code
This very useful to have when you want to suppress lint warnings with LaTeX
comments. chktex tends to be a bit noisy so this often needed.
* lacheck: Make regex less specific
To be more robust future changes in `stdin-wrapper`
