this can be used instead of delete-duplicates when the list must also
be sorted.
the main reason for this function will be for the upcoming aging.scm
report which will use it heavily to slice APAR splits into owner list.
And in Windows only with the value from the environment if there is one.
Calling it with "" in Windows ignores the environment and sets it to the
system settings.
copied function created by Mark Weaver, core guile dev and augmented
to selectively replace substring indices
This is a much more efficient function than the previous
gnc:substring-replace which will constantly split lists using
substring, and create new strings using string-append.
It also does tail call optimization properly, unlike the previous
functions.
https://lists.gnu.org/archive/html/guile-devel/2013-09/msg00029.html -
original
"Here's an implementation that does this benchmark about 80 times
faster on my machine: (20 milliseconds vs 1.69 seconds)
--8<---------------cut here---------------start------------->8---
(define* (string-replace-substring s substr replacement
#:optional
(start 0)
(end (string-length s)))
(let ((substr-length (string-length substr)))
(if (zero? substr-length)
(error "string-replace-substring: empty substr")
(let loop ((start start)
(pieces (list (substring s 0 start))))
(let ((idx (string-contains s substr start end)))
(if idx
(loop (+ idx substr-length)
(cons* replacement
(substring s start idx)
pieces))
(string-concatenate-reverse (cons (substring s start)
pieces))))))))
--8<---------------cut here---------------end--------------->8---
The reason this is so much faster is because it avoids needless
generation of intermediate strings."
gnc:gui-[warn|error|msg] are new global functions.
By default they mirror gnc:warn/error/msg. However then gnome is
available, they will display appropriate warn/error/info dialog in
addition to outputting to console.
