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perf(bash-v2): short-circuit descriptionless candidate lists

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If the list of candidates has no descriptions, short circuit all the
description processing logic, basically just do a `compgen -W` for the
whole list and be done with it.

We could conceivably do some optimizations like this and more when
generating the completions with `--no-descriptions` in Go code, by
omitting some parts we know won't be needed, or doing some things
differently. But doing it this way in bash, the improvements are
available also to completions generated with descriptions enabled when
they are invoked for completion cases that produce no
descriptions. The result after this for descriptionless entries seems
fast enough so it seems there's no immediate need to look into doing
that.
This commit is contained in:
Ville Skyttä 2022-04-30 09:16:36 +03:00
parent 4f0facbcee
commit ebdfdf3087
1 changed files with 8 additions and 0 deletions
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8
bash_completionsV2.go
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@ -176,6 +176,14 @@ __%[1]s_handle_completion_types() {
__%[1]s_handle_standard_completion_case() { __%[1]s_handle_standard_completion_case() {
local tab=$'\t' comp local tab=$'\t' comp
# Short circuit to optimize if we don't have descriptions
if [[ $out != *$tab* ]]; then
while IFS='' read -r comp; do
COMPREPLY+=("$comp")
done < <(IFS=$'\n' compgen -W "$out" -- "$cur")
return 0
fi
local longest=0 local longest=0
# Look for the longest completion so that we can format things nicely # Look for the longest completion so that we can format things nicely
while IFS='' read -r comp; do while IFS='' read -r comp; do