diff options
| -rw-r--r-- | guix/build/utils.scm | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/guix/build/utils.scm b/guix/build/utils.scm index c480dbf8a6..737976e8e4 100644 --- a/guix/build/utils.scm +++ b/guix/build/utils.scm @@ -413,10 +413,11 @@ PROC's result is returned." (false-if-exception (delete-file template)))))) (define (substitute file pattern+procs) - "PATTERN+PROCS is a list of regexp/two-argument procedure. For each line -of FILE, and for each PATTERN that it matches, call the corresponding PROC -as (PROC LINE MATCHES); PROC must return the line that will be written as a -substitution of the original line." + "PATTERN+PROCS is a list of regexp/two-argument-procedure pairs. For each +line of FILE, and for each PATTERN that it matches, call the corresponding +PROC as (PROC LINE MATCHES); PROC must return the line that will be written as +a substitution of the original line. Be careful about using '$' to match the +end of a line; by itself it won't match the terminating newline of a line." (let ((rx+proc (map (match-lambda (((? regexp? pattern) . proc) (cons pattern proc)) @@ -476,7 +477,10 @@ When one of the MATCH-VAR is `_', no variable is bound to the corresponding match substring. Alternatively, FILE may be a list of file names, in which case they are -all subject to the substitutions." +all subject to the substitutions. + +Be careful about using '$' to match the end of a line; by itself it won't +match the terminating newline of a line." ((substitute* file ((regexp match-var ...) body ...) ...) (let () (define (substitute-one-file file-name) |