feat: add plugins for zsh

.zsh/zsh-fzf-tab/lib/-ftb-generate-header

@@ -0,0 +1,35 @@
+#!/hint/zsh
+
+typeset -ga _ftb_headers=()
+local i tmp group_colors
+local -i mlen=0 len=0
+
+if (( $#_ftb_groups == 1 )) && { ! -ftb-zstyle -m single-group "header" }; then
+  return
+fi
+
+# calculate the max column width
+for i in $_ftb_groups; do
+  (( $#i > mlen )) && mlen=$#i
+done
+mlen+=1
+
+-ftb-zstyle -a group-colors group_colors || group_colors=($_ftb_group_colors)
+
+for (( i=1; i<=$#_ftb_groups; i++ )); do
+  [[ $_ftb_groups[i] == "__hide__"* ]] && continue
+
+  if (( len + $#_ftb_groups[i] > COLUMNS - 5 )); then
+    _ftb_headers+=$tmp
+    tmp='' && len=0
+  fi
+  if (( len + mlen > COLUMNS - 5 )); then
+    # the last column doesn't need padding
+    _ftb_headers+=$tmp$group_colors[i]$_ftb_groups[i]$'\033[00m'
+    tmp='' && len=0
+  else
+    tmp+=$group_colors[i]${(r:$mlen:)_ftb_groups[i]}$'\033[00m'
+    len+=$mlen
+  fi
+done
+(( $#tmp )) && _ftb_headers+=$tmp