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96deaae7d8
I have no idea why `apt-cache --no-generate show` is so slow since it basically dumps the contents of the cache file located at `/var/lib/dpkg/status`. We are technically bypassing any waits on the cache lock file so this may produce incorrect results if the cache is being regenerated in the moment, but that's a small price to pay and the results are likely confined to simply not generating comprehensive results. With this change, we no longer need to truncate results to the first n matches and we no longer only print packages beginning with the commandline argument enabling fish's partial completions logic to offer less-perfect suggestions when no better options are available. Even though we are generating more usable completions, we still trounce the old performance by leaps and bounds: ``` Benchmark #1: fish -c "complete -C\"apt install ac\"" Time (mean ± σ): 2.165 s ± 0.033 s [User: 267.0 ms, System: 1932.2 ms] Range (min … max): 2.136 s … 2.256 s 10 runs Benchmark #2: build/fish -c "complete -C\"apt install ac\"" Time (mean ± σ): 111.1 ms ± 1.8 ms [User: 38.9 ms, System: 72.9 ms] Range (min … max): 108.2 ms … 114.9 ms 26 runs Summary 'build/fish -c "complete -C\"apt install ac\""' ran 19.49 ± 0.44 times faster than 'fish -c "complete -C\"apt install ac\""' ```
60 lines
1.1 KiB
Fish
60 lines
1.1 KiB
Fish
function __fish_print_apt_packages
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argparse --name=__fish_print_packages i/installed -- $argv
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or return
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switch (commandline -ct)
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case '-**'
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return
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end
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set -l search_term (commandline -ct | string replace -ar '[\'"\\\\]' '' | string lower)
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if ! test -f /var/lib/dpkg/status
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return 1
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end
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# Do not not use `apt-cache` as it is sometimes inexplicably slow (by multiple orders of magnitude).
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if not set -q _flag_installed
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awk -e '
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BEGIN {
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FS=": "
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}
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/^Package/ {
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pkg=$2
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}
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/^Description(-[a-zA-Z]+)?:/ {
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desc=$2
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if (index(pkg, "'$search_term'") > 0) {
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print pkg "\t" desc
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}
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pkg="" # Prevent multiple description translations from being printed
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}' < /var/lib/dpkg/status
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else
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awk -e '
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BEGIN {
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FS=": "
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}
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/^Package/ {
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pkg=$2
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}
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/^Status/ {
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installed=0
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if ($2 ~ /(^|\s)installed/) {
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installed=1
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}
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}
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/^Description(-[a-zA-Z]+)?:/ {
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desc=$2
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if (installed == 1 && index(pkg, "'$search_term'") > 0) {
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print pkg "\t" desc
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installed=0 # Prevent multiple description translations from being printed
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}
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}' < /var/lib/dpkg/status
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end
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end
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