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Re: [O] function for inserting a block

From: Eric Abrahamsen
Subject: Re: [O] function for inserting a block
Date: Mon, 30 Oct 2017 09:22:28 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.90 (gnu/linux)

Nicolas Goaziou <address@hidden> writes:

> Hello,
> Eric Abrahamsen <address@hidden> writes:
>> This will get there eventually! Because there's likely to be more
>> tweaking, I haven't touched the manual or the tests yet, just reworked
>> the option and function:
> Thank you. Some comments follow.
>> #+BEGIN_SRC elisp
>> (defcustom org-structure-template-alist
>>   '((?s . "SRC")
>>     (?e . "EXAMPLE")
>>     (?E . "EXPORT")
>>     (?q . "QUOTE")
>>     (?v . "VERSE")
>>     (?V . "VERBATIM")
> This block type doesn't exist. You can remove it.
>>     (?c . "CENTER")
>>     (?C . "COMMENT")
>>     (?l . "EXPORT latex")
>>     (?L . "#+LaTeX")
> #+LATEX or #+latex (see below)
>>     (?h . "EXPORT html")
>>     (?H . "#+HTML")
>>     (?a . "EXPORT ascii")
>>     (?A . "#+ASCII")
>>     (?i . "#+INDEX")
>>     (?I . "#+INCLUDE"))
> As suggested by Rasmus once, maybe we could get away from FORTRAN touch
> and insert everything lowercase.

Sounds good to me.

>>   "Structure completion elements.
>> This is an alist of characters and values.  When
>> `org-insert-structure-template' is called, an additional key is
>> read.  The key is first looked up in this alist, and the
>> corresponding structure is inserted.  Hitting <TAB> will prompt
>> for a structure.
> I would remove "Hitting <TAB> prompts for a structure." which belongs to
> the function's docstring, not to variable's.
>> Structure strings prefixed with a \"#+\" are inserted with no
>> further processing.  Strings without this prefix are used to
>> create a block structure, with \"#+BEGIN\" and \"#+END\" added
>> automatically.
> I'm not sure about this part. I understand the backward-compatibility
> concern, but it sounds a bit alien to the purpose of the function, i.e.,
> there is no wrapping around, it is not an "environment" either. WDYT?

It was a hack; I was trying to make the smallest change possible. But
that does turn it into a bit of a Frankenstein, and I would prefer to
remove it. As you mentioned earlier, Emacs already has mechanism for
inserting snippets.

The "include" case is a little different, since it does provide some
extra convenience. I've still taken it out in the next version below, though.

>> There are two templates for each key, the first uses the original Org
>> syntax,
> You can remove it.
>> the second uses Emacs Muse-like syntax tags.  These Muse-like tags become
>> the default when the /org-mtags.el/ module has been loaded.  See also the
>> variable `org-mtags-prefer-muse-templates'."
>>   :group 'org-completion
>>   :type '(repeat
>>        (cons
>>         (character :tag "Key")
>>         (string :tag "Template")))
>>   :version "26.1"
>>   :package-version '(Org . "8.3"))
> You need to update :version and :package-version. Technically,
> if :package-version is provided, we should only use it, IIUC.

I've never really understood the difference. Current version is 9.1.2,
will this function be present in 9.1.3, or 9.2.0? I've assumed 9.2.0 in
the next version of the patch.

>> (defun org-insert-structure-template (&optional type)
>>   "Insert a block structure of the type #+BEGIN_FOO/#+END_FOO.
>> This function first reads a character, which can be one of the
>> keys in `org-structure-template-alist'.  It can also be <TAB>, in
>> which case the user is prompted for a string to use.
> "When it is <TAB>, prompt the user for a string to use."
>>   (interactive)
>>   (let* ((key (read-key "Key: "))
>>       (struct-string
>>        (or (cdr-safe (assq key org-structure-template-alist))
> `cdr-safe' -> `cdr'
>>            (when (= key ?\t)
>>              (read-string "Structure type: "))
> Nitpick: (and (eq key ?\t) (read-string ...))

Out of curiosity is this a style thing, or semantics, or performance?

>>            (error "'%c' has no structure definition" key))))
>>     (if (string-prefix-p "#+" struct-string)
>>      (progn
>>        (insert (format "%s: " struct-string))
>>        (when (string= "#+INCLUDE" struct-string)
>>          (insert
>>           (format "\"%s\""
>>                   (abbreviate-file-name
>>                    (read-file-name "Include file: "))))))

If we take out special handling of "#+" strings, this part is gone

Here's a new version with all the above changes made, and the docs
tweaked accordingly.

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