[GSoC][PATCH v2 0/1] userdiff: add support for scheme

Hello all,

This is v2 of the patch I sent to add userdiff support to Scheme. I have modified my approach to be more inclusive of as many Schemes as possible and thus added many more forms. Since Ævar suggested we veer on the side of inclusion when talking about the Gerbil scheme syntax, I felt it made sense to extend the driver to include common, but non-standard extensions of Scheme, including the forms of Racket and Guile.

Forms added since last patch:

 - Variants of define such as def, defsyntax etc as suggested by Phillip and the
   other reviewers. - The library form of R6RS, as well as module definitions of
   Racket, Gerbil and Guile. * These forms were added on the recommendation of
   Göran Weinholt, creator of the Akku scheme package manager and the Loko
   Scheme implementation:
   https://groups.google.com/g/comp.lang.scheme/c/Aczn0TNEr5g/m/Jq3AlKvZBgAJ -
   The Racket forms for defining structs and classes.

I have restricted the "def" forms to only certain keywords, so that it does not over-match to words like "deflate", "deform", "defer" etc.

I have also allowed the use of "/" after a define or def form, as some scheme code uses it as a convention for defines in a certain context, such as Racket's "define/public".

I have also fixed some a test case which had a redundant "ChangeMe".

Finally in the word regex, which has been simplified a lot, while retaining the same functioning after taking into account Junio's suggestions.

Atharva Raykar (1):
  userdiff: add support for Scheme

 Documentation/gitattributes.txt    |  2 ++
 t/t4018-diff-funcname.sh           |  1 +
 t/t4018/scheme-class               |  7 +++++++
 t/t4018/scheme-def                 |  4 ++++
 t/t4018/scheme-def-variant         |  4 ++++
 t/t4018/scheme-define-slash-public |  7 +++++++
 t/t4018/scheme-define-syntax       |  8 ++++++++
 t/t4018/scheme-define-variant      |  4 ++++
 t/t4018/scheme-library             | 11 +++++++++++
 t/t4018/scheme-local-define        |  4 ++++
 t/t4018/scheme-module              |  6 ++++++
 t/t4018/scheme-top-level-define    |  4 ++++
 t/t4018/scheme-user-defined-define |  6 ++++++
 t/t4034-diff-words.sh              |  1 +
 t/t4034/scheme/expect              | 10 ++++++++++
 t/t4034/scheme/post                |  5 +++++
 t/t4034/scheme/pre                 |  5 +++++
 userdiff.c                         |  4 ++++
 18 files changed, 93 insertions(+)
 create mode 100644 t/t4018/scheme-class
 create mode 100644 t/t4018/scheme-def
 create mode 100644 t/t4018/scheme-def-variant
 create mode 100644 t/t4018/scheme-define-slash-public
 create mode 100644 t/t4018/scheme-define-syntax
 create mode 100644 t/t4018/scheme-define-variant
 create mode 100644 t/t4018/scheme-library
 create mode 100644 t/t4018/scheme-local-define
 create mode 100644 t/t4018/scheme-module
 create mode 100644 t/t4018/scheme-top-level-define
 create mode 100644 t/t4018/scheme-user-defined-define
 create mode 100644 t/t4034/scheme/expect
 create mode 100644 t/t4034/scheme/post
 create mode 100644 t/t4034/scheme/pre