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| author | Stefan Kangas <stefankangas@gmail.com> | 2022-09-27 18:16:51 +0200 |
|---|---|---|
| committer | Stefan Kangas <stefankangas@gmail.com> | 2022-09-29 15:39:27 +0200 |
| commit | 5281946fbf6b3cdbec5ce82e0057c71849faf4d2 (patch) | |
| tree | 8f519625372642a2faaa4a1bf314a07e2e283a6b /doc/lispref/strings.texi | |
| parent | 423bdd5f7f273f40f750eac83017074501d52823 (diff) | |
| download | emacs-5281946fbf6b3cdbec5ce82e0057c71849faf4d2.tar.gz emacs-5281946fbf6b3cdbec5ce82e0057c71849faf4d2.tar.bz2 emacs-5281946fbf6b3cdbec5ce82e0057c71849faf4d2.zip | |
Make format-spec accept function substitutions
* lisp/format-spec.el (format-spec): Accept a function producing the
substitution for a character.
* doc/lispref/strings.texi (Custom Format Strings): Document the
above change.
* test/lisp/format-spec-tests.el (format-spec/function): New test.
Ref. https://lists.gnu.org/r/emacs-devel/2022-09/msg01875.html
Diffstat (limited to 'doc/lispref/strings.texi')
| -rw-r--r-- | doc/lispref/strings.texi | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/lispref/strings.texi b/doc/lispref/strings.texi index 374381e5955..ba247a3edae 100644 --- a/doc/lispref/strings.texi +++ b/doc/lispref/strings.texi @@ -1293,6 +1293,11 @@ The order of specifications in @var{template} need not correspond to the order of associations in @var{spec-alist}. @end itemize +REPLACEMENT can also be a function taking no arguments, and returning +a string to be used for the replacement. It will only be called when +the corresponding LETTER is used in the TEMPLATE. This is useful, for +example, to avoid prompting for input unless it is needed. + The optional argument @var{ignore-missing} indicates how to handle specification characters in @var{template} that are not found in @var{spec-alist}. If it is @code{nil} or omitted, the function |