Provides commands and a minor mode for easily reformatting SQL
using external programs such as "sqlformat" and "pg_format".

Install the "sqlparse" (Python) package to get "sqlformat",
or "pgformatter" to get "pg_format",
or "sqlfluff" (Python) to get "sqlfluff",

Customise the `sqlformat-command' variable as desired.  For example,
to use "pgformatter" (i.e., the `pg_format` command) with
two-character indent and no statement grouping,

    (setq sqlformat-command 'pgformatter)
    (setq sqlformat-args '("-s2" "-g"))

Then call `sqlformat', `sqlformat-buffer' or `sqlformat-region' as
convenient.

Enable `sqlformat-on-save-mode' in SQL buffers like this:

    (add-hook 'sql-mode-hook 'sqlformat-on-save-mode)

or locally to your project with a form in your .dir-locals.el like
this:

    ((sql-mode
      (mode . sqlformat-on-save)))

You might like to bind `sqlformat' or `sqlformat-buffer' to a key,
e.g. with:

    (define-key 'sql-mode-map (kbd "C-c C-f") 'sqlformat)