Hello,
Eric S Fraga <e.fr...@ucl.ac.uk> writes:
> On Monday, 8 May 2017 at 15:32, Dushyant Juneja wrote:
>> A very useful macro indeed!
>>
>> One suggestion: can this also be made to support nested headings. For
>> instance:
>> * Part {{{c}}}
>> ** Part {{{c}}}.{{{c}}}
>> * Part {{{c}}}
>
> I think this is what separate counters will enable but also motivates
> need to be able to reset a counter (e.g. the sub-heading one in above
> example if it were to be used in the second part).
Good idea.
Here is an updated patch, in which one can write
{{{c(sub,reset)}}}
{{{c(sub, 5)}}}
or even, for the default macro
{{{c(,reset)}}}
{{{c(, 99)}}}
I find the manual entry a bit awkward. Suggestions welcome.
Regards,
--
Nicolas Goaziou
>From 31397ffa1b0bf9795e2bc11568598af13db6c609 Mon Sep 17 00:00:00 2001
From: Nicolas Goaziou <m...@nicolasgoaziou.fr>
Date: Mon, 8 May 2017 12:38:38 +0200
Subject: [PATCH] org-macro: Implement the "c" macro
* lisp/org-macro.el (org-macro--counter-table): New variable.
(org-macro--counter-initialize):
(org-macro--counter-increment): New functions.
(org-macro-initialize-templates): Use new functions.
* doc/org.texi (Macro replacement): Document new macro.
---
doc/org.texi | 10 ++++++++++
lisp/org-macro.el | 38 +++++++++++++++++++++++++++++++++++---
2 files changed, 45 insertions(+), 3 deletions(-)
diff --git a/doc/org.texi b/doc/org.texi
index 312870f91..6072fcb78 100644
--- a/doc/org.texi
+++ b/doc/org.texi
@@ -10852,6 +10852,16 @@ This macro refers to the filename of the exported file, if any.
This macro returns the value of property @var{PROPERTY-NAME} in current
entry. If @var{SEARCH-OPTION} (@pxref{Search options}) refers to a remote
entry, it will be used instead.
+
+@item @{@{@{c@}@}@}
+@itemx @{@{@{c(@var{NAME})@}@}@}
+@itemx @{@{@{c(@var{NAME},@var{RESET})@}@}@}
+@cindex c, macro
+@cindex counter, macro
+This macro returns the number of occurrences of this macro expanded so far.
+You can use more than one counter using different @var{NAME} values. If
+@var{RESET} is non-empty, the specified counter is reset to the value
+specified if it is a number, or 1 otherwise.
@end table
The surrounding brackets can be made invisible by setting
diff --git a/lisp/org-macro.el b/lisp/org-macro.el
index 71e917b71..afd302932 100644
--- a/lisp/org-macro.el
+++ b/lisp/org-macro.el
@@ -36,8 +36,11 @@
;; Along with macros defined through #+MACRO: keyword, default
;; templates include the following hard-coded macros:
-;; {{{time(format-string)}}}, {{{property(node-property)}}},
-;; {{{input-file}}} and {{{modification-time(format-string)}}}.
+;; {{{time(format-string)}}},
+;; {{{property(node-property)}}},
+;; {{{input-file}}},
+;; {{{modification-time(format-string)}}},
+;; {{{c(counter,reset}}}.
;; Upon exporting, "ox.el" will also provide {{{author}}}, {{{date}}},
;; {{{email}}} and {{{title}}} macros.
@@ -129,7 +132,7 @@ function installs the following ones: \"property\",
(let ((old-template (assoc (car cell) templates)))
(if old-template (setcdr old-template (cdr cell))
(push cell templates))))))
- ;; Install hard-coded macros.
+ ;; Install "property", "time" macros.
(mapc update-templates
(list (cons "property"
"(eval (save-excursion
@@ -143,6 +146,7 @@ function installs the following ones: \"property\",
l)))))
(org-entry-get nil \"$1\" 'selective)))")
(cons "time" "(eval (format-time-string \"$1\"))")))
+ ;; Install "input-file", "modification-time" macros.
(let ((visited-file (buffer-file-name (buffer-base-buffer))))
(when (and visited-file (file-exists-p visited-file))
(mapc update-templates
@@ -152,6 +156,10 @@ function installs the following ones: \"property\",
(prin1-to-string visited-file)
(prin1-to-string
(nth 5 (file-attributes visited-file)))))))))
+ ;; Initialize and install "c" macro.
+ (org-macro--counter-initialize)
+ (funcall update-templates
+ (cons "c" "(eval (org-macro--counter-increment \"$1\" \"$2\"))"))
(setq org-macro-templates templates)))
(defun org-macro-expand (macro templates)
@@ -280,6 +288,9 @@ Return a list of arguments, as strings. This is the opposite of
s nil t)
"\000"))
+
+;;; Helper functions and variables for internal macros
+
(defun org-macro--vc-modified-time (file)
(save-window-excursion
(when (vc-backend file)
@@ -304,6 +315,27 @@ Return a list of arguments, as strings. This is the opposite of
(kill-buffer buf))
date))))
+(defvar org-macro--counter-table nil
+ "Hash table containing counter value per name.")
+
+(defun org-macro--counter-initialize ()
+ "Initialize `org-macro--counter-table'."
+ (setq org-macro--counter-table (make-hash-table :test #'equal)))
+
+(defun org-macro--counter-increment (name &optional reset)
+ "Increment counter NAME.
+NAME is a string identifying the counter. If optional argument
+RESET is a non-empty string, reset the counter instead."
+ (if (org-string-nw-p reset)
+ (let ((new-value (if (string-match-p "\\`[ \t]*[0-9]+[ \t]*\\'" reset)
+ (string-to-number reset)
+ 1)))
+ (puthash name new-value org-macro--counter-table))
+ (let ((value (gethash name org-macro--counter-table)))
+ (puthash name
+ (if (null value) 1 (1+ value))
+ org-macro--counter-table))))
+
(provide 'org-macro)
;;; org-macro.el ends here
--
2.12.2
