This adds support for shader_test files in piglit, the open source
test suite for OpenGL implementations such as mesa. More information on
piglit can be found at:
https://piglit.freedesktop.org/
This reverts commit 0e1f6f6866.
Given the unexpected behaviour of this and disruption to people's
established work flows, I'm reverting this until a better solution can
be found that only handles the special comment format inside React code
blocks.
Technically the minimum necessary syntax for block comments requires
only a single hyphen (`-}`, `{-`), but I have found that using a double
hyphen plays a bit more nicely with the elmcast/elm-vim auto-formatting.
Further, uncommenting when using the single dashes leaves an extra level
of indentation (again, when using elmcast/elm-vim).
M4 knows about two types of ignoring text. But the concept which the
GNU M4 manual refers to as "comments" [0] (i.e., lines prefixed with
hash signs) is actually telling the interpreter "ignore this text, but
pass it to the output". Most of the time, people don't want the macro
comments in their output, so instead the `dnl` ("discard to next line")
macro [1] is usually used for comments in the document-my-thoughts
sense.
[0]: https://www.gnu.org/software/m4/manual/m4.html#Comments
[1]: https://www.gnu.org/software/m4/manual/m4.html#Dnl
Previously the `NERDTrimTrailingWhitespace` option was only evaluated when uncommenting a line. However sometimes trailing whitespace was being added when commenting, notably when commenting empty lines. This checks for and removes such space at comment time.
* Allow commenting empty lines given configuration
If g:NERDCommentEmptyLines=1 then it will comment empty line, which is
useful when commenting blocks.
When uncommenting it will delete any trailing whitespace.
* Add documentation for NERDCommentEmptyLines
getbufvar accepts only two arguments in Vim 7.3 (at least the one
included in OS X 10.11.5), and returns an empty string when the buffer
or variable does not exist: getbufvar({buffer}, {variable}).
Vim 7.4 has extended the built-in function so that it additionally
accepts an optional argument which determines the default return value:
getbufvar({buffer}, {variable}, [, {default}]). When the third argument
is not given and the buffer or variable does not exists, getbufvar
returns an empty string as before.
getbufvar({buffer}, {variable}) works in both Vim 7.3 and 7.4, and is
practically equivalent to getbufvar({buffer}, {variable}, 0) because an
empty string is coerced to 0 if necessary.
