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From: | GNU bug Tracking System |
Subject: | bug#59469: closed (29.0.50; Eshell "for" loop: Calling a non-lisp command (example: /usr/bin/tail) sets the variable exported in the {} block of "for var in list {}" to nil) |
Date: | Fri, 10 Feb 2023 05:45:02 +0000 |
Your message dated Thu, 9 Feb 2023 21:44:15 -0800 with message-id <fb8f8c86-fd74-d53b-2d5a-fba94b6dae4c@gmail.com> and subject line Re: bug#59469: 29.0.50; Eshell "for" loop: Calling a non-lisp command (example: /usr/bin/tail) sets the variable exported in the {} block of "for var in list {}" to nil (was: Adding a simpler duplication of the issue) has caused the debbugs.gnu.org bug report #59469, regarding 29.0.50; Eshell "for" loop: Calling a non-lisp command (example: /usr/bin/tail) sets the variable exported in the {} block of "for var in list {}" to nil to be marked as done. (If you believe you have received this mail in error, please contact help-debbugs@gnu.org.) -- 59469: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=59469 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems
--- Begin Message ---Subject: 29.0.50; Eshell "for" loop: Calling a non-lisp command (example: /usr/bin/tail) sets the variable exported in the {} block of "for var in list {}" to nil Date: Mon, 21 Nov 2022 21:04:51 -0500 Hi,I might be doing something wrong, but it appears that calling any non-lisp command (example: /usr/bin/tail) causes the variable set in the {} block of "for var in list {}" to change to nil.
To duplicate, please create a file "bug.txt" in ~tmp,
echo "line one" > ~/tmp/bug.txt
then run the following code -
In the code below, *please replace my full path "/home/mzimmermann/tmp/bug.txt" with your full path. There seems to be an unrelated issue trying to list ~/tmp/bug.txt*
for file in (list "/home/mzimmermann/tmp/bug.txt") {
type-of $file
echo "file=$file";
# Create a variable. The back and forth between .log and .txt is
# only there to simulate some useful work to set value of samefile
export samefile="${echo $file(:s/.txt/.log/)}"(:s/.log/.txt/);
echo "samefile=$samefile"
# Note that on my system, 'which tail' ==> /usr/bin/tail
tail $file
# Note that on my system, 'which cat' ==> eshell/cat is a byte-compiled Lisp function in ‘em-unix.el’.
# cat $file
echo "samefile=$samefile"
echo "file=$file";
}
Actual result:
================
string
file=/home/mzimmermann/tmp/bug.txt
samefile=/home/mzimmermann/tmp/bug.txt
line one
samefile=nil
file=/home/mzimmermann/tmp/bug.txt
================
Please *note how the contents of samefile is nullified. This is the bug I am reporting here*
Expected result:
================
string
file=/home/mzimmermann/tmp/bug.txt
samefile=/home/mzimmermann/tmp/bug.txt
line one
samefile=/home/mzimmermann/tmp/bug.txt
file=/home/mzimmermann/tmp/bug.txt
================
Notes:
1. I tried this with other non-lisp functions (/usr/bin/gzip) and it caused the same issue.
2. If we use "cat" which is an elisp function, the loop works as expected.Thanks,Milan Zimmermann
--- End Message ---
--- Begin Message ---Subject: Re: bug#59469: 29.0.50; Eshell "for" loop: Calling a non-lisp command (example: /usr/bin/tail) sets the variable exported in the {} block of "for var in list {}" to nil (was: Adding a simpler duplication of the issue) Date: Thu, 9 Feb 2023 21:44:15 -0800 On 1/28/2023 10:55 PM, Jim Porter wrote:Here's an updated patch with an improved comment introducing Eshell's iterative evaluation. Hopefully the added detail will help anyone else who looks into this code (assuming I haven't replaced it with threads or generator.el's CPS machinery by then, of course!).Merged as c53255f677. Closing this bug now.
--- End Message ---
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