From: Mortimer Cladwell <mbcladwell@gmail.com>
To: help-guix <help-guix@gnu.org>
Subject: Help needed with substitute* command
Date: Thu, 6 Jan 2022 07:53:17 -0500 [thread overview]
Message-ID: <CAOcxjM5hvMypudEOzUL8T+468HupS2wPW=KUthv_Oyi3wb9TDg@mail.gmail.com> (raw)
Hi,
I do not understand the second substitute* example in the Guix Manual.
I have the executable mysubs.scm:
--mysubs.scm---------------------------------------------------------
(add-to-load-path
"/gnu/store/rjzj1z89jqcb60nhg5gknkibcl84b3jb-guix-29745d23b-modules/share/guile/site/3.0")
(add-to-load-path ".")
(use-modules
(guix build utils)
(ice-9 rdelim)
(ice-9 popen)
(ice-9 regex) ;;list-matches
(ice-9 pretty-print))
(define (main args)
(begin
(substitute* "./input.txt"
(("hello")
"good morning\n")
(("foo([a-z]+)bar(.*)$" all letters end)
(string-append "baz" letters end))))
(pretty-print "done"))
---------end------------------------------------------------------------
I run this on 2 different inputs representing the two examples in the
manual:
---input.txt(1)------
hello
---------------------
result: good morning
---input.txt(2)-------
foo(abc)bar(def)
-------------------
result: foo(abc)bar(def)
Why no substitution with the second example?
Is the letters/letter in the manual a typo? If I use letter I get
"...unbound variable..."
Thanks
Mortimer
next reply other threads:[~2022-01-06 12:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-06 12:53 Mortimer Cladwell [this message]
2022-01-06 13:50 ` Help needed with substitute* command Tobias Geerinckx-Rice
2022-01-06 14:53 ` Mortimer Cladwell
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