clojure - clj-pdf 中的模板

Question

我正在使用 clj-pdf生成pdf文件。正如 README 文件所建议的，该库提供了一些基本的模板选项。

例如，给定一个 map 向量，如:

(def employees
  [{:country "Germany",
    :place "Nuremberg",
    :occupation "Engineer",
    :name "Neil Chetty"}
   {:country "Germany",
    :place "Ulm",
    :occupation "Engineer",
    :name "Vera Ellison"}])

和一个模板

(def employee-template
  (template
    [:paragraph
     [:heading $name]
     [:chunk {:style :bold} "occupation: "] $occupation "\n"
     [:chunk {:style :bold} "place: "] $place "\n"
     [:chunk {:style :bold} "country: "] $country
     [:spacer]]))

将产生以下输出:

(employee-template employees)

([:paragraph [:heading "Neil Chetty"] 
  [:chunk {:style :bold} "occupation: "] "Engineer" "\n" 
  [:chunk {:style :bold} "place: "] "Nuremberg" "\n" 
  [:chunk {:style :bold} "country: "] "Germany" [:spacer]] 
 [:paragraph [:heading "Vera Ellison"] 
  [:chunk {:style :bold} "occupation: "] "Engineer" "\n" 
  [:chunk {:style :bold} "place: "] "Ulm" "\n" 
  [:chunk {:style :bold} "country: "] "Germany" [:spacer]])

但是，我想知道如何在 pdf 函数中使用这个模板。当我使用

(pdf
  [[:heading "Heading 1"]
   [:table
    {:width 100  :border false  :cell-border false  :widths [30 70]  :offset 35}
    [[:cell {:align :right}
      (employee-template employees)]
     [:cell "dummy"]]]
   [:heading "Heading 2"]]
  "output.pdf")

我遇到了一个无效标签异常。

如果我将 (employee-template employees) 更改为 (first (employee-template employees))，它会按我的预期工作。模板的正确使用方法是什么？

Answer 1

这行得通。为每个员工生成一个新单元格。

(pdf
  [[:heading "Heading 1"]
   [:table {:width 100  :border false  :cell-border false :widths [30 70]  :offset 35}
    (for [e (employee-template employees)]
      [:cell {:align :right} e])]
   [:heading "Heading 2"]]
  "output.pdf")