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vared: avoid using local variables

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The tmp and prompt variables collide with variables used as arguments.
Just avoid them entirely, at the cost of making the internals of the
functions somewhat more complicated.

Closes #8836.
This commit is contained in:
David Adam 2022-03-27 12:42:40 +08:00
parent cc689290cd
commit fa2450db30
2 changed files with 11 additions and 17 deletions
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1
CHANGELOG.rst
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@ -35,6 +35,7 @@ Interactive improvements
- ``less`` and other interactive commands would occasionally be stopped when run in a pipeline with fish functions; this has been fixed (:issue:`8699`).
- Case-changing autosuggestions generated mid-token now correctly append only the suffix, instead of duplicating the token (:issue:`8820`).
- ``ulimit`` learned a number of new options for the resource limits available on Linux, FreeBSD and NetBSD, and returns a specific warning if the limit specified is not available on the active operating system (:issue:`8823`).
- The ``vared`` command can now successfully edit variables named "tmp" or "prompt" (:issue:`8836`).
New or improved bindings
^^^^^^^^^^^^^^^^^^^^^^^^

27
share/functions/vared.fish
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@ -17,25 +17,18 @@ function vared --description "Edit variable value"
case '*'
if test (count $$argv ) -lt 2
set -l init ''
if test -n "$$argv"
set init $$argv
end
set -l prompt 'set_color green; echo '$argv'; set_color normal; echo "> "'
if read -p $prompt -c $init tmp
# Avoid using any local variables in this function, otherwise they can't be edited
# https://github.com/fish-shell/fish-shell/issues/8836
# If variable already exists, do not add any
# switches, so we don't change export rules. But
# if it does not exist, we make the variable
# global, so that it will not die when this
# function dies
# The command substitution in this line controls the scope.
# If variable already exists, do not add any switches, so we don't change
# scoping or export rules. But if it does not exist, we make the variable
# global, so that it will not die when this function dies.
if test -n "$$argv"
set $argv $tmp
else
set -g $argv $tmp
end
end
read -p 'set_color green; echo '$argv'; set_color normal; echo "> "' \
(if not set -q $argv; echo -g; end) \
-c "$$argv" \
$argv
else
printf (_ '%s: %s is an array variable. Use %svared%s %s[n]%s to edit the n:th element of %s\n') vared $argv (set_color $fish_color_command; echo) (set_color $fish_color_normal; echo) $argv (set_color normal; echo) $argv
end