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print_apt_packages: Go back to apt-cache for non-installed packages

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Unfortunately, /var/lib/dpkg/status on recent-ish Debian versions at
least only contains the *installed* packages, rendering this solution
broken.

What we do instead is:

1. Remove a useless newline from each package, so our limit would now
let more full package data sets through
2. Increase the limit by 5x

This yields a completion that runs in ~800ms instead of ~700ms on a
raspberry pi, but gives ~10x the candidates, compared to the old
apt-cache version.

This partially reverts 96deaae7d8

(cherry picked from commit 81cd035950)
This commit is contained in:
Fabian Boehm 2023-08-22 22:17:22 +02:00
parent ab45e4abf2
commit 136b99839b
1 changed files with 31 additions and 5 deletions
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36
share/functions/__fish_print_apt_packages.fish
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@ -7,7 +7,12 @@ function __fish_print_apt_packages
return
end
type -q -f apt-cache || return 1
set -l search_term (commandline -ct | string replace -ar '[\'"\\\\]' '' | string lower)
if ! test -f /var/lib/dpkg/status
return 1
end
if not set -q _flag_installed
# Do not generate the cache as apparently sometimes this is slow.
# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=547550
@ -28,11 +33,32 @@ function __fish_print_apt_packages
# The `head -n 500` causes us to stop once we have 500 lines. We do it after the `sed` because
# Debian package descriptions can be extremely long and are hard-wrapped: texlive-latex-extra
# has about 2700 lines on Debian 11.
apt-cache --no-generate show '.*'(commandline -ct)'.*' 2>/dev/null | sed -r '/^(Package|Description-?[a-zA-Z_]*):/!d;s/Package: (.*)/\1\t/g;s/Description-?[^:]*: (.*)/\1\x1a\n/g' | head -n 500 | string join "" | string replace --all --regex \x1a+ \n | uniq
apt-cache --no-generate show '.*'(commandline -ct)'.*' 2>/dev/null | sed -r '/^(Package|Description-?[a-zA-Z_]*):/!d;s/Package: (.*)/\1\t/g;s/Description-?[^:]*: (.*)/\1\x1a/g' | head -n 2500 | string join "" | string replace --all --regex \x1a+ \n | uniq
return 0
else
set -l packages (dpkg --get-selections | string replace -fr '(\S+)\s+install' "\$1" | string match -e (commandline -ct))
apt-cache --no-generate show $packages 2>/dev/null | sed -r '/^(Package|Description-?[a-zA-Z_]*):/!d;s/Package: (.*)/\1\t/g;s/Description-?[^:]*: (.*)/\1\x1a\n/g' | head -n 500 | string join "" | string replace --all --regex \x1a+ \n | uniq
return 0
# Do not not use `apt-cache` as it is sometimes inexplicably slow (by multiple orders of magnitude).
awk '
BEGIN {
FS=": "
}
/^Package/ {
pkg=$2
}
/^Status/ {
installed=0
if ($2 ~ /(^|\s)installed/) {
installed=1
}
}
/^Description(-[a-zA-Z]+)?:/ {
desc=$2
if (installed == 1 && index(pkg, "'$search_term'") > 0) {
print pkg "\t" desc
installed=0 # Prevent multiple description translations from being printed
}
}' </var/lib/dpkg/status
end
end