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fish: replace use of tr with string split

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This shaves about 4ms off fish start time.

Before (profiled with 'fish --profile prof.txt -c fish_prompt'):

225	4636	----> set -l __nix_profile_paths (echo $NIX_PROFILES | /nix/store/m5ajgnzp2512na31brwfmydwk3l1gawb-coreutils-8.31/bin/tr ' ' '\n')[-1..1]
4411	4411	-----> echo $NIX_PROFILES | /nix/store/m5ajgnzp2512na31brwfmydwk3l1gawb-coreutils-8.31/bin/tr ' ' '\n'

After:

190	248	----> set -l __nix_profile_paths (string split ' ' $NIX_PROFILES)[-1..1]
This commit is contained in:
Bouke van der Bijl 2020-06-17 18:59:35 +02:00
parent 9d0c3ffe67
commit 9daa1838d3
1 changed files with 1 additions and 1 deletions
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2
pkgs/shells/fish/default.nix
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@ -79,7 +79,7 @@ let
# additional profiles are expected in order of precedence, which means the reverse of the
# NIX_PROFILES variable (same as config.environment.profiles)
set -l __nix_profile_paths (echo $NIX_PROFILES | ${coreutils}/bin/tr ' ' '\n')[-1..1]
set -l __nix_profile_paths (string split ' ' $NIX_PROFILES)[-1..1]
set __extra_completionsdir \
$__nix_profile_paths"/etc/fish/completions" \