Re: rdelim: Add new procedure `for-line-in-file`.
Adam Faiz <[email protected]>
| Newsgroups | gmane.lisp.guile.devel |
|---|---|
| Message-ID | <[email protected]> |
Hi Ricardo, On 12/16/24 00:57, Ricardo Wurmus wrote: > Hi Adam, > > has this patch been discussed somewhere else? I'm asking because I have > no context other than this patch. No, actually. Was I supposed to discuss it's use in the patch cover letter? The reason I sent this patch was to make it convenient for other Scheme programmers to do per-line processing of a text file, if they need to do so. >> From 18485a2b94595ae2239f5dcdeb06d3a80bb04bf1 Mon Sep 17 00:00:00 2001 >> From: AwesomeAdam54321 <[email protected]> >> Date: Sun, 15 Dec 2024 23:48:30 +0800 >> Subject: [PATCH] rdelim: Add new procedure `for-line-in-file`. >> >> * module/ice-9/rdelim.scm (for-line-in-file): Add it. >> --- >> module/ice-9/rdelim.scm | 12 ++++++++++++ >> 1 file changed, 12 insertions(+) >> >> diff --git a/module/ice-9/rdelim.scm b/module/ice-9/rdelim.scm >> index d2cd081d7..ffa38efad 100644 >> --- a/module/ice-9/rdelim.scm >> +++ b/module/ice-9/rdelim.scm >> @@ -206,3 +206,15 @@ characters to read. By default, there is no limit." >> line) >> (else >> (error "unexpected handle-delim value: " handle-delim))))) >> + >> +;;; for-line-in-file [PORT BODY] calls BODY (a procedure with the >> +;;; line from PORT as it's argument) for every line until the >> +;;; eof-object is reached. The line provided to BODY is guaranteed >> +;;; to be a string. >> + >> +(define (for-line-in-file file body) >> + (while #t >> + (let ((line (read-line file))) >> + (if (string? line) >> + (body line) >> + (break))))) > It is preferrable to use a docstring instead of a comment. The choice > of argument names is inconsistent, though. You're using PORT in the > comment and FILE in the definition. BODY as a name for a procedure is > also a rather "inspired" choice. Thanks for the feedback! I'll send a revised patch that addresses these issues. > Where is BREAK defined? Break is defined by the ‘while’ loop: https://www.gnu.org/software/guile/manual/html_node/while-do.html