From 9d999b73747be10a0aaad8c59a2ef09f263e847f Mon Sep 17 00:00:00 2001
From: Origami404 <Origami404@foxmail.com>
Date: Wed, 8 Apr 2026 17:35:17 +0800
Subject: [PATCH] [zsh] try to reduce zsh startup time

---
 home/modules/zsh.nix                       |  2 +-
 home/standalone/.zsh.d/normalize-fpath.zsh | 56 ++++++++++++++++++++++
 home/standalone/.zshrc                     |  2 +
 3 files changed, 59 insertions(+), 1 deletion(-)
 create mode 100644 home/standalone/.zsh.d/normalize-fpath.zsh

diff --git a/home/modules/zsh.nix b/home/modules/zsh.nix
index ca4a367..fd1960c 100644
--- a/home/modules/zsh.nix
+++ b/home/modules/zsh.nix
@@ -2,7 +2,7 @@
 {
   programs.zsh = {
     enable = true;
-    enableCompletion = true;
+    # enableCompletion = true;
     autosuggestion.enable = true;
     syntaxHighlighting.enable = true;
   };
diff --git a/home/standalone/.zsh.d/normalize-fpath.zsh b/home/standalone/.zsh.d/normalize-fpath.zsh
new file mode 100644
index 0000000..c6fb10b
--- /dev/null
+++ b/home/standalone/.zsh.d/normalize-fpath.zsh
@@ -0,0 +1,56 @@
+# 这个文件用于在 grml/compinit 初始化补全系统之前规整 fpath。
+#
+# 修复的问题：
+# 1. NixOS、Home Manager、用户 profile 和 zsh 自带目录会同时向 fpath 注入补全目录。
+# 2. 这些目录里大量内容重复，有些只是同一真实目录的不同软链接入口。
+# 3. compinit 会遍历这些重复目录，导致启动变慢，并且更容易让 .zcompdump 的文件数校验失效。
+#
+# 处理策略：
+# 1. 先按 realpath 去重，移除同一真实目录的多重入口。
+# 2. 再按目录类别保留一份，避免 site-functions、vendor-completions 和 zsh 标准函数目录被重复扫描。
+normalize-fpath() {
+  emulate -L zsh
+  setopt extendedglob
+
+  local dir real key bucket
+  local -a new_fpath
+  local -A seen_realpath seen_bucket
+
+  for dir in $fpath; do
+    [[ -d "$dir" ]] || continue
+
+    real="${dir:A}"
+    key="${real%/}"
+    if [[ -n "${seen_realpath[$key]}" ]]; then
+      continue
+    fi
+
+    bucket=""
+    case "$real" in
+      */share/zsh/site-functions)
+        bucket="site:${real:t}"
+        ;;
+      */share/zsh/vendor-completions)
+        bucket="vendor:${real:t}"
+        ;;
+      */share/zsh/<->.<->/functions)
+        bucket="core:${real:t:h:t}"
+        ;;
+      /usr/share/grml/zsh/*)
+        bucket="grml:${real:t}"
+        ;;
+    esac
+
+    if [[ -n "$bucket" && -n "${seen_bucket[$bucket]}" ]]; then
+      continue
+    fi
+
+    seen_realpath[$key]=1
+    [[ -n "$bucket" ]] && seen_bucket[$bucket]=1
+    new_fpath+=("$dir")
+  done
+
+  fpath=("${new_fpath[@]}")
+}
+
+normalize-fpath
diff --git a/home/standalone/.zshrc b/home/standalone/.zshrc
index 8ab340d..b16c256 100644
--- a/home/standalone/.zshrc
+++ b/home/standalone/.zshrc
@@ -2,6 +2,8 @@
 
 ZSHD="$HOME/.zsh.d"
 
+source "$ZSHD/normalize-fpath.zsh"
+
 if [[ ! -v ZSH_GRML_SOURCED ]]; then
   source $ZSHD/grml-zshrc
 fi