From: Scott L. Burson Date: Wed, 15 Apr 2026 02:27:43 +0000 (+0000) Subject: userdiff: extend Scheme support to cover other Lisp dialects X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=b79f7a3ad3ffde16b2cbc2457561669f4833f861;p=thirdparty%2Fgit.git userdiff: extend Scheme support to cover other Lisp dialects Common Lisp has top-level forms, such as 'defun' and 'defmacro', that are not matched by the current Scheme pattern. Also, it is more common in CL, when defining user macros intended as top-level forms, to prefix their names with "def" instead of "define"; such forms are also not matched. And some top-level forms don't even begin with "def". On the other hand, it is an established formatting convention in the Lisp community that only top-level forms start at the left margin. So matching any unindented line starting with an open parenthesis is an acceptable heuristic; false positives will be rare. However, there are also cases where notionally top-level forms are grouped together within some containing form. At least in the Common Lisp community, it is conventional to indent these by two spaces, or sometimes one. But matching just an open parenthesis indented by two spaces would be too broad; so the pattern added by this commit requires an indented form to start with "(def". It is believed that this strikes a good balance between potential false positives and false negatives. Signed-off-by: Scott L. Burson Acked-by: Johannes Sixt Signed-off-by: Junio C Hamano --- diff --git a/Documentation/gitattributes.adoc b/Documentation/gitattributes.adoc index f20041a323..bd76167a45 100644 --- a/Documentation/gitattributes.adoc +++ b/Documentation/gitattributes.adoc @@ -911,7 +911,8 @@ patterns are available: - `rust` suitable for source code in the Rust language. -- `scheme` suitable for source code in the Scheme language. +- `scheme` suitable for source code in most Lisp dialects, + including Scheme, Emacs Lisp, Common Lisp, and Clojure. - `tex` suitable for source code for LaTeX documents. diff --git a/t/t4018/scheme-lisp-defun-a b/t/t4018/scheme-lisp-defun-a new file mode 100644 index 0000000000..c3c750f76d --- /dev/null +++ b/t/t4018/scheme-lisp-defun-a @@ -0,0 +1,4 @@ +(defun some-func (x y z) RIGHT + (let ((a x) + (b y)) + (ChangeMe a b))) diff --git a/t/t4018/scheme-lisp-defun-b b/t/t4018/scheme-lisp-defun-b new file mode 100644 index 0000000000..21be305968 --- /dev/null +++ b/t/t4018/scheme-lisp-defun-b @@ -0,0 +1,4 @@ +(macrolet ((foo (x) `(bar ,x))) + (defun mumble (x) ; RIGHT + (when (> x 0) + (foo x)))) ; ChangeMe diff --git a/t/t4018/scheme-lisp-eval-when b/t/t4018/scheme-lisp-eval-when new file mode 100644 index 0000000000..5d941d7e0e --- /dev/null +++ b/t/t4018/scheme-lisp-eval-when @@ -0,0 +1,4 @@ +(eval-when (:compile-toplevel :load-toplevel :execute) ; RIGHT + (set-macro-character #\? + (lambda (stream char) + `(make-pattern-variable ,(read stream))))) ; ChangeMe diff --git a/t/t4018/scheme-module b/t/t4018/scheme-module-a similarity index 100% rename from t/t4018/scheme-module rename to t/t4018/scheme-module-a diff --git a/t/t4018/scheme-module-b b/t/t4018/scheme-module-b new file mode 100644 index 0000000000..77bc0c5eff --- /dev/null +++ b/t/t4018/scheme-module-b @@ -0,0 +1,6 @@ +(module A + (export with-display-exception) + (extern (display-exception display-exception)) + (def (with-display-exception thunk) RIGHT + (with-catch (lambda (e) (display-exception e (current-error-port)) e) + thunk ChangeMe))) diff --git a/t/t4034/scheme/expect b/t/t4034/scheme/expect index 138abe9f56..fb7f2616fe 100644 --- a/t/t4034/scheme/expect +++ b/t/t4034/scheme/expect @@ -6,7 +6,7 @@ (define (myfunc a bmy-func first second) ; This is a really(moderately) cool function. (this\placethat\place (+ 3 4)) - (define |the greeting||a greeting| "hello") + (define |the \| \greeting||a \greeting| |hello there|) ({}(([](func-n)[])){}) (let ((c (+ a badd1 first))) (format "one more than the total is %d" (add1+ c second)))) diff --git a/t/t4034/scheme/post b/t/t4034/scheme/post index 0e3bab101d..450cc234f7 100644 --- a/t/t4034/scheme/post +++ b/t/t4034/scheme/post @@ -1,7 +1,7 @@ (define (my-func first second) ; This is a (moderately) cool function. (that\place (+ 3 4)) - (define |a greeting| "hello") + (define |a \greeting| |hello there|) ({(([(func-n)]))}) (let ((c (add1 first))) (format "one more than the total is %d" (+ c second)))) diff --git a/t/t4034/scheme/pre b/t/t4034/scheme/pre index 03d77c7c43..e16ee75849 100644 --- a/t/t4034/scheme/pre +++ b/t/t4034/scheme/pre @@ -1,7 +1,7 @@ (define (myfunc a b) ; This is a really cool function. (this\place (+ 3 4)) - (define |the greeting| "hello") + (define |the \| \greeting| |hello there|) ({}(([](func-n)[])){}) (let ((c (+ a b))) (format "one more than the total is %d" (add1 c)))) diff --git a/userdiff.c b/userdiff.c index fe710a68bf..b5412e6bc3 100644 --- a/userdiff.c +++ b/userdiff.c @@ -344,14 +344,24 @@ PATTERNS("rust", "|[0-9][0-9_a-fA-Fiosuxz]*(\\.([0-9]*[eE][+-]?)?[0-9_fF]*)?" "|[-+*\\/<>%&^|=!:]=|<<=?|>>=?|&&|\\|\\||->|=>|\\.{2}=|\\.{3}|::"), PATTERNS("scheme", - "^[\t ]*(\\(((define|def(struct|syntax|class|method|rules|record|proto|alias)?)[-*/ \t]|(library|module|struct|class)[*+ \t]).*)$", /* - * R7RS valid identifiers include any sequence enclosed - * within vertical lines having no backslashes + * An unindented opening parenthesis identifies a top-level + * expression in all Lisp dialects. */ - "\\|([^\\\\]*)\\|" - /* All other words should be delimited by spaces or parentheses */ - "|([^][)(}{[ \t])+"), + "^(\\(.*)$\n" + /* For Scheme: a possibly indented left paren followed by a keyword. */ + "^[\t ]*(\\(((define|def(struct|syntax|class|method|rules|record|proto|alias)?)[-*/ \t]|(library|module|struct|class)[*+ \t]).*)$\n" + /* + * For all Lisp dialects: a slightly indented line starting with "(def". + */ + "^ ?(\\([Dd][Ee][Ff].*)$", + /* + * The union of R7RS and Common Lisp symbol syntax: allows arbitrary + * strings between vertical bars, including any escaped characters. + */ + "\\|([^|\\\\]|\\\\.)*\\|" + /* All other words should be delimited by spaces or parentheses. */ + "|([^][)(}{ \t])+"), PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$", "\\\\[a-zA-Z@]+|\\\\.|([a-zA-Z0-9]|[^\x01-\x7f])+"), { .name = "default", .binary = -1 },