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perf(init): don't fork scutil when $HOST is already the Bonjour name

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On macOS `scutil --get LocalHostName` was run on every startup to get a
stable short hostname for the zcompdump filename. When $HOST is the
Bonjour name (`<LocalHostName>.local`), which is the common case, the
LocalHostName is just $HOST without the suffix, so use that directly and
keep the scutil lookup for hosts that got a different name from DHCP.

Measured on macOS arm64, zsh 5.9: 6 ms -> 0.2 ms per interactive start.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This commit is contained in:
Robby Russell
2026-09-06 08:03:54 -07:00
co-authored by Claude Fable 5.1
parent 426650fbe8
commit b37d4878ed
1 changed files with 7 additions and 1 deletions
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oh-my-zsh.sh
+7 -1
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@@ -100,7 +100,13 @@ done
# Figure out the SHORT hostname
if [[ "$OSTYPE" = darwin* ]]; then
# macOS's $HOST changes with dhcp, etc. Use LocalHostName if possible.
SHORT_HOST=$(scutil --get LocalHostName 2>/dev/null) || SHORT_HOST="${HOST/.*/}"
# When $HOST is the Bonjour name (<LocalHostName>.local) it already is the
# LocalHostName, so don't fork scutil to look it up.
if [[ "$HOST" = *.local ]]; then
SHORT_HOST="${HOST%.local}"
else
SHORT_HOST=$(scutil --get LocalHostName 2>/dev/null) || SHORT_HOST="${HOST/.*/}"
fi
else
SHORT_HOST="${HOST/.*/}"
fi