tweaked performance

bash-git-prompt

@@ -5,7 +5,7 @@
 # Default to theme 1 if not set
 GIT_PROMPT_THEME="${GIT_PROMPT_THEME:-1}"
 
-# Define all 6 themes
+# Define theme icons
 set_git_prompt_theme_icons() {
   case "$GIT_PROMPT_THEME" in
     2|3)
@@ -62,40 +62,39 @@ set_git_prompt_theme_icons() {
       ;;
   esac
 }
-
-# Initialize icons
 set_git_prompt_theme_icons
 
-# Git prompt logic
+# Caching mechanism
-git_prompt_info() {
+GIT_CACHE_FILE="/tmp/git_prompt_cache.$$"
+GIT_CACHE_EXPIRY=2  # seconds
+
+actual_git_prompt_info_logic() {
   git rev-parse --is-inside-work-tree &>/dev/null || return
 
   local branch
   branch=$(git symbolic-ref --short HEAD 2>/dev/null || echo "(detached)")
 
   local status
-  status=$(git status --porcelain=2 --branch 2>/dev/null) || return
+  status=$(GIT_OPTIONAL_LOCKS=0 git status --porcelain --branch 2>/dev/null) || return
 
   local staged conflicts changed untracked stashed is_clean has_remote
-  staged=$(grep -cE '^1 [ADMRT]' <<<"$status")
+  staged=$(grep -cE '^[AMDR] ' <<<"$status")
-  conflicts=$(grep -cE '^u ' <<<"$status")
+  conflicts=$(grep -cE '^UU ' <<<"$status")
-  changed=$(grep -cE '^1 .[MD]' <<<"$status")
+  changed=$(grep -cE '^.[MD] ' <<<"$status")
-  untracked=$(grep -cE '^\? ' <<<"$status")
+  untracked=$(grep -cE '^\?\? ' <<<"$status")
-  stashed=$(git stash list 2>/dev/null | wc -l | tr -d ' ')
+  stashed=$(GIT_OPTIONAL_LOCKS=0 git stash list 2>/dev/null | grep -c .)
 
   local upstream
   upstream=$(git rev-parse --abbrev-ref --symbolic-full-name "@{u}" 2>/dev/null)
-  if [[ -n "$upstream" ]]; then
+  [[ -n "$upstream" ]] && has_remote=1 || has_remote=0
-    has_remote=1
-    git fetch --quiet & disown
-  else
-    has_remote=0
-  fi
 
   local ahead=0 behind=0
   if (( has_remote )); then
-    ahead=$(git rev-list --left-right --count "$upstream...HEAD" 2>/dev/null | awk '{print $2}')
+    local counts
-    behind=$(git rev-list --left-right --count "$upstream...HEAD" 2>/dev/null | awk '{print $1}')
+    counts=$(git rev-list --left-right --count "${upstream}...HEAD" 2>/dev/null | tr -s '[:space:]' ' ')
+    read -r behind ahead <<< "$counts"
+    ahead=${ahead:-0}
+    behind=${behind:-0}
   fi
 
   is_clean=0
@@ -104,7 +103,6 @@ git_prompt_info() {
   fi
 
   if [[ "$GIT_PROMPT_THEME" == "2" ]]; then
-    # Powerline Theme 2
     printf "\[\e[30;44m\]"
     printf "\[\e[97;44m\] %s%s" "$BRANCH_ICON" "$branch"
     ((staged > 0))    && printf " %s%d" "$STAGED_ICON" "$staged"
@@ -115,18 +113,12 @@ git_prompt_info() {
     ((ahead > 0))     && printf " %s%d" "$AHEAD_ICON" "$ahead"
     ((behind > 0))    && printf " %s%d" "$BEHIND_ICON" "$behind"
     ((has_remote == 0)) && printf " %s" "$NO_REMOTE_ICON"
-    if (( is_clean )); then
+    ((is_clean)) && printf " %s" "$CLEAN_ICON" || printf " %s" "$DIRTY_ICON"
-      printf " %s" "$CLEAN_ICON"
-    else
-      printf " %s" "$DIRTY_ICON"
-    fi
     printf "\[\e[34;107m\]"
     printf "\[\e[30;107m\] \w"
     printf "\[\e[97;49m\]"
     printf "\[\e[0m\]"
-
   elif [[ "$GIT_PROMPT_THEME" == "3" ]]; then
-    # Two-line theme: git info in brackets, directory outside (in gold)
     printf "\n\[\e[0;37m\]┌──[\e[0m"
     printf "\e[38;5;117m%s%s\e[0m" "$BRANCH_ICON" "$branch"
     ((staged > 0))    && printf " \e[38;5;196m%s%d\e[0m" "$STAGED_ICON" "$staged"
@@ -137,17 +129,10 @@ git_prompt_info() {
     ((ahead > 0))     && printf " \e[0;37m%s%d\e[0m"     "$AHEAD_ICON" "$ahead"
     ((behind > 0))    && printf " \e[0;37m%s%d\e[0m"     "$BEHIND_ICON" "$behind"
     ((has_remote == 0)) && printf " \e[38;5;250m%s\e[0m" "$NO_REMOTE_ICON"
-    if (( is_clean )); then
+    ((is_clean)) && printf " \e[0;32m%s\e[0m" "$CLEAN_ICON" || printf " \e[38;5;196m%s\e[0m" "$DIRTY_ICON"
-      printf " \e[0;32m%s\e[0m" "$CLEAN_ICON"
+    printf "\e[0;37m]\e[0m \[\e[38;5;178m\]\w\[\e[0m\]"
-    else
-      printf " \e[38;5;196m%s\e[0m" "$DIRTY_ICON"
-    fi
-    printf "\e[0;37m]\e[0m"
-    printf " \[\e[38;5;178m\]\w\[\e[0m\]"
     printf "\n\[\e[0;37m\]└──\[\e[0m\]"
-
   else
-    # Default bracket theme
     printf "\e[0;37m[\e[0m"
     printf "\e[38;5;117m%s%s\e[0m" "$BRANCH_ICON" "$branch"
     ((staged > 0))    && printf " \e[38;5;196m%s%d\e[0m" "$STAGED_ICON" "$staged"
@@ -158,16 +143,29 @@ git_prompt_info() {
     ((ahead > 0))     && printf " \e[0;37m%s%d\e[0m"     "$AHEAD_ICON" "$ahead"
     ((behind > 0))    && printf " \e[0;37m%s%d\e[0m"     "$BEHIND_ICON" "$behind"
     ((has_remote == 0)) && printf " \e[38;5;250m%s\e[0m" "$NO_REMOTE_ICON"
-    if (( is_clean )); then
+    ((is_clean)) && printf " \e[0;32m%s\e[0m" "$CLEAN_ICON" || printf " \e[38;5;196m%s\e[0m" "$DIRTY_ICON"
-      printf " \e[0;32m%s\e[0m" "$CLEAN_ICON"
-    else
-      printf " \e[38;5;196m%s\e[0m" "$DIRTY_ICON"
-    fi
     printf "\e[0;37m]\e[0m"
   fi
 }
 
-# Auto-updating prompt
+git_prompt_info() {
+  git rev-parse --is-inside-work-tree &>/dev/null || return
+
+  local now=$(date +%s)
+  local last_mod=0
+  [[ -f "$GIT_CACHE_FILE" ]] && last_mod=$(stat -c %Y "$GIT_CACHE_FILE" 2>/dev/null || echo 0)
+
+  if (( now - last_mod < GIT_CACHE_EXPIRY )); then
+    cat "$GIT_CACHE_FILE"
+    return
+  fi
+
+  local output
+  output=$(actual_git_prompt_info_logic)
+  echo "$output" > "$GIT_CACHE_FILE"
+  echo "$output"
+}
+
 update_git_prompt() {
   local PROMPT_CHAR='$'
   [[ $EUID -eq 0 ]] && PROMPT_CHAR='#'
@@ -188,7 +186,6 @@ update_git_prompt() {
 
 PROMPT_COMMAND=update_git_prompt
 
-# Theme switch command
 gpchange() {
   local theme="${1:-}"
   if [[ "$theme" =~ ^[1-5]$ ]]; then