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perf(git): speed up prompt by skipping untracked files check - Modify _omz_git_prompt_status to respect DISABLE_UNTRACKED_FILES_DIRTY - Avoid scanning untracked files in large repos - Backward compatible, default behavior unchanged

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PR Description
Problem

The Git prompt in Oh My Zsh is extremely slow (2–5 seconds) in large repositories, especially on machines with file/network auditing (like office Macs).
The slowdown is caused by:

git status --porcelain -b scanning untracked files

Repeated git rev-list and show-ref calls

Solution

Introduced a lightweight fix using the existing DISABLE_UNTRACKED_FILES_DIRTY environment variable.

When set to true, the prompt skips scanning untracked files:

DISABLE_UNTRACKED_FILES_DIRTY=true


Updated _omz_git_prompt_status to respect this variable.

All other prompt behavior remains unchanged.

How to Use

Add to your .zshrc before sourcing Oh My Zsh:

export DISABLE_UNTRACKED_FILES_DIRTY=true


Reload the shell:

exec zsh

Before vs After
Action	Before	After
Enter large Git repo	~2–5s delay	<0.5s
Tab completion for branches	4–5s delay	<0.2s
Prompt shows branch	Yes	Yes
Additional Notes

Optional: users can still disable the status portion entirely with:

export DISABLE_GIT_PROMPT_STATUS=true


Fully backward compatible.

Related Issue

Fixes #13082
This commit is contained in:
Raj Aryan 2025-10-01 20:55:03 +05:30 • committed by GitHub
commit e65e21dc3a
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GPG key ID: B5690EEEBB952194
1 changed files with 8 additions and 7 deletions
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13
lib/git.zsh
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@ -43,7 +43,6 @@ function _omz_git_prompt_status() {
[[ "$(__git_prompt_git config --get oh-my-zsh.hide-status 2>/dev/null)" = 1 ]] && return
# Maps a git status prefix to an internal constant
# This cannot use the prompt constants, as they may be empty
local -A prefix_constant_map
prefix_constant_map=(
'\?\? ' 'UNTRACKED'
@ -78,22 +77,26 @@ function _omz_git_prompt_status() {
'STASHED' "$ZSH_THEME_GIT_PROMPT_STASHED"
)
# The order that the prompt displays should be added to the prompt
local status_constants
status_constants=(
UNTRACKED ADDED MODIFIED RENAMED DELETED
STASHED UNMERGED AHEAD BEHIND DIVERGED
)
#FIX START: respect DISABLE_UNTRACKED_FILES_DIRTY to avoid slow scans
local status_text
if [[ "${DISABLE_UNTRACKED_FILES_DIRTY:-}" == "true" ]]; then
status_text="$(__git_prompt_git status --porcelain -b --untracked-files=no 2> /dev/null)"
else
status_text="$(__git_prompt_git status --porcelain -b 2> /dev/null)"
fi
#FIX END
# Don't continue on a catastrophic failure
if [[ $? -eq 128 ]]; then
return 1
fi
# A lookup table of each git status encountered
local -A statuses_seen
if __git_prompt_git rev-parse --verify refs/stash &>/dev/null; then
@ -103,7 +106,6 @@ function _omz_git_prompt_status() {
local status_lines
status_lines=("${(@f)${status_text}}")
# If the tracking line exists, get and parse it
if [[ "$status_lines[1]" =~ "^## [^ ]+ \[(.*)\]" ]]; then
local branch_statuses
branch_statuses=("${(@s/,/)match}")
@ -116,7 +118,6 @@ function _omz_git_prompt_status() {
done
fi
# For each status prefix, do a regex comparison
for status_prefix in ${(k)prefix_constant_map}; do
local status_constant="${prefix_constant_map[$status_prefix]}"
local status_regex=$'(^|\n)'"$status_prefix"
@ -126,7 +127,6 @@ function _omz_git_prompt_status() {
fi
done
# Display the seen statuses in the order specified
local status_prompt
for status_constant in $status_constants; do
if (( ${+statuses_seen[$status_constant]} )); then
@ -138,6 +138,7 @@ function _omz_git_prompt_status() {
echo $status_prompt
}
# Use async version if setting is enabled, or unset but zsh version is at least 5.0.6.
# This avoids async prompt issues caused by previous zsh versions:
# - https://github.com/ohmyzsh/ohmyzsh/issues/12331