refactor: simplify dotfiles configuration

uninstall.sh

@@ -1,18 +1,41 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 
-app_dir="$HOME/dotfiles"
+set -Eeuo pipefail
 
-warn() {
-    echo "$1" >&2
+SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" 2>/dev/null && pwd -P || true)"
+if [[ -n "$SCRIPT_DIR" && -e "$SCRIPT_DIR/.git" ]]; then
+  APP_PATH="${APP_PATH:-$SCRIPT_DIR}"
+else
+  APP_PATH="${APP_PATH:-$HOME/.dotfiles}"
+fi
+readonly APP_PATH
+readonly MANAGED_START='# >>> dotfiles >>>'
+readonly MANAGED_END='# <<< dotfiles <<<'
+
+remove_managed_link() {
+  local target=$1 expected=$2
+  if [[ -L "$target" && "$(readlink "$target")" == "$expected" ]]; then
+    rm -- "$target"
+    printf 'Removed %s\n' "$target"
+  fi
 }
 
-die() {
-    warn "$1"
-    exit 1
+remove_managed_block() {
+  local file=$1 temp
+  [[ -f "$file" ]] || return
+  temp=$(mktemp)
+  awk -v start="$MANAGED_START" -v end="$MANAGED_END" '
+    $0 == start { managed = 1; next }
+    $0 == end { managed = 0; next }
+    !managed { print }
+  ' "$file" > "$temp"
+  cat "$temp" > "$file"
+  rm -f "$temp"
 }
 
-rm $HOME/.vimrc
-rm $HOME/.vimrc.bundles
-rm $HOME/.vim
+remove_managed_link "$HOME/.vimrc" "$APP_PATH/.vimrc"
+remove_managed_link "$HOME/.tmux.conf" "$APP_PATH/.tmux.conf"
+remove_managed_block "$HOME/.bashrc"
 
-rm -rf $app_dir
+printf '%s\n' 'Dotfile links and the managed Bash block were removed.'
+printf '%s\n' 'The repository, Vim data/plugins, TPM, and backups were retained.'