[zsh] add function for checking out latest versions of plugins

zsh/plugins.zsh

@@ -13,7 +13,9 @@ _plugin() {
   _perf_timer_stop "plugin $1"
 }
 
-_plugin completions 'zsh-users/zsh-completions'
+_checkout_latest_version='build=plugin-cfg-git-checkout-version "*"'
+
+_plugin completions 'zsh-users/zsh-completions' "$_checkout_latest_version"
 
 # compinit {{{
   # note that completion system must be initialized after zsh-completions and
@@ -60,14 +62,19 @@ _plugin completions 'zsh-users/zsh-completions'
 
 # }}}
 
-_plugin fzf 'junegunn/fzf' build='./install --bin' \
+_plugin fzf 'junegunn/fzf' "$_checkout_latest_version" \
+  build='./install --bin' \
   after_load='plugin-cfg-path path prepend bin' \
   after_load='plugin-cfg-path manpath prepend man'
 
-_plugin alias-tips 'djui/alias-tips'
+if command_exists python; then
+  _plugin alias-tips 'djui/alias-tips'
+fi
 
 FAST_WORK_DIR="$ZSH_CACHE_DIR"
 if [[ "$TERM" != "linux" ]]; then
-  _plugin fast-syntax-highlighting 'zdharma/fast-syntax-highlighting'
+  _plugin fast-syntax-highlighting 'zdharma/fast-syntax-highlighting' "$_checkout_latest_version"
   set-my-syntax-theme() { fast-theme "$ZSH_DOTFILES/my-syntax-theme.ini" "$@"; }
 fi
+
+unset _checkout_latest_version

zsh/zplg.zsh

@@ -395,6 +395,27 @@ plugin() {
     esac
   }
 
+  plugin-cfg-git-checkout-version() {
+    if (( $# < 1 )); then
+      _zplg_error "usage: $0 <pattern>"
+      return 1
+    fi
+
+    local pattern="$1" tag no_tags=1
+
+    command git tag --sort=-version:refname | while IFS= read -r tag; do
+      no_tags=0
+      if [[ "$tag" == ${~pattern} ]]; then
+        break
+      fi
+    done
+
+    if (( ! no_tags )); then
+      _zplg_log "the latest version is $tag"
+      command git checkout --quiet "$tag"
+    fi
+  }
+
 # }}}
 
 # Exits with success code 0 if the plugin is loaded, otherwise exits with error