[GSoC PATCH 1/2] userdiff: add builtin driver for gitconfig syntax

From Documentation/config.adoc:

""" The file consists of sections and variables. A section begins with the name of the section in square brackets and continues until the next section begins. Section names are case-insensitive. Only alphanumeric characters, `-` and `.` are allowed in section names. Each variable must belong to some section, which means that there must be a section header before the first setting of a variable.

[...]

Subsection names are case sensitive and can contain any characters except newline and the null byte.

The variable names are case-insensitive, allow only alphanumeric characters and `-`, and must start with an alphabetic character. """

Then, add a new builtin driver for gitconfig files, where:

- the funcname regular expression matches sections and subsections,
  i. e. the pattern [SECTION] or [SECTION "SUBSECTION"], where the
  section is composed by alphanumeric numbers, `-` and `.`, and
  subsection names may be composed by any characters;

- word_regex is more permissive, matching any word with one or more
  non-whitespace characters.

Signed-off-by: Lucas Seiki Oshiro <lucasseikioshiro@gmail.com>
---
 userdiff.c | 4 ++++
 1 file changed, 4 insertions(+)