机构模式:Symbol的函数定义无效:\， [英] Org Mode: Symbol's function definition is void: \,

问题描述

我正在尝试创建一个组织模式捕获模板，该模板将每个条目写入基于时间的文件名.

I'm trying to create an Org mode capture template that writes each entry to a time-based filename.

首先，在暂存缓冲区中有一个辅助函数:

First, there is a helper function that works in the scratch buffer:

;; Example input: (capture-date-based-file "~/path/to/logs/" "log")
;; Expected output: "~/path/to/logs/2017-11-27-monday-log.org"
(defun capture-date-based-file (path entry-type)
  "Create a date-based file name based on the given type."
  (downcase (concat path (format-time-string "%Y-%m-%d-%A-") entry-type ".org")))

然后，它在捕获模板列表中使用:

Then, it's used in the capture templates list:

(setq org-capture-templates
      '(("l" "Log" entry (file+headline ,(capture-date-based-file "~/path/to/logs/" "log"))
         "* %?\n%U\n" :clock-in t :clock-resume t) ))

我得到一个错误:符号的函数定义无效:\，

由于逗号，很难在Google中找到答案.我查看了文档，但不确定自己做错了什么.

It's difficult to find an answer in Google, because of the comma character. I've looked over the docs, and I'm not sure what I'm doing wrong.

推荐答案

逗号表示您要评估对基于捕获日期的文件的调用>，但是周围的格式是 quoted 而不是 backquoted ，这样就行不通了.

The comma suggests that you're wanting to evaluate the call to capture-date-based-file, but the surrounding form is quoted rather than backquoted, so that won't work.

即这是两个截然不同的东西:

i.e. these are two quite different things:

'(foo ,(bar) baz)
`(foo ,(bar) baz)

请参见 Ch i g (elisp)反引号 RET

在带反引号的形式中，逗号使随后的形式立即被求值，然后将该求值的结果替换为带反引号的形式.以引号形式，，(bar)只是保留为原义的，(bar).

In a backquoted form, the comma causes the form which follows to be evaluated immediately, and the result of that evaluation is then substituted into the backquoted form. In a quoted form, ,(bar) simply remains as a literal ,(bar).

您看到的特定错误的原因是lisp阅读器产生以下内容:

The reason for the specific error you saw is that the lisp reader produces the following:

ELISP> (read ",(bar)")
(\, (bar))

因此，求值 ，(bar)的任何尝试实际上是在调用不存在的函数 \，

Therefore any attempt to evaluate ,(bar) is actually calling the non-existent function \,

(FWIW，您将遇到的不太明显的错误之一.)

(One of the less-obvious errors you'll encounter, FWIW.)

在您的情况下，我假设组织将特定的表单从模板结构中拉出并进行评估. M-x错误触发切换最有可能向您确切显示发生这种情况的时间和地点.

In your scenario I presume that org pulls that particular form out of the template structure and evaluates it. M-x toggle-debug-on-error would most likely show you exactly where and when this happens.

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