feat(man.vim): convert spaces to underscores #16068

PostgreSQL ships with man pages for SQL statements like `CREATE TABLE`,
which are provided with underscores as `man 7 CREATE_TABLE`. This patch
updates `man#open_page` (as used by `:Man`) such that visually selecting
the words `CREATE TABLE` in SQL code and pressing `K` properly opens the
desired man page.

Writing `:Man CREATE TABLE` still does not work, since `CREATE` is
interpreted as a section name. (Similarly, `:Man CREATE TABLE AS` fails
because there are too many arguments to `:Man`.) But this is okay,
because if you're typing it anyway then you can just enter underscores
and also tab-completion properly suggests `:Man CREATE_TABLE(7)`.

This is a bit bespoke, but my box has over 9000 man pages (as reported
by `man -k '' | wc -l`), and not one of them has a space in the man page
name, whereas the Postgres manuals do exist and are actually useful.

Test Plan:
On a machine with Postgres manual pages, running

    nvim -u NORC +'exe "norm iCREATE TABLE foo(x int);" | norm 0veeK'

should open the appropriate man page.

wchargin-branch: man-spaces-to-underscores

0 files changed, 0 insertions, 0 deletions